2023.1
This manual provides a detailed list and usage information regarding input entries, output entries, and parameters available in OptiStruct.
Alphabetical listing of the Bulk Data Entries.
Bulk Data Entry This Bulk Data card is identical to the I/O Options Entry, INCLUDE.
View new features for OptiStruct 2023.1.
OptiStruct is a proven, modern structural solver with comprehensive, accurate and scalable solutions for linear and nonlinear analyses across statics and dynamics, vibrations, acoustics, fatigue, heat transfer, and multiphysics disciplines.
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This manual provides detailed information regarding the features, functionality, and simulation methods available in OptiStruct.
The input file in OptiStruct is composed of three distinct sections.
The following guidelines apply to all entries in the I/O Options and Subcase Information sections.
The following guidelines apply to all entries in the Bulk Data Entry section.
The Data Selectors table is available in an Excel spreadsheet.
Supported types of optimization for various analysis sequences are outlined.
Descriptions for individual I/O Option Entries can be accessed by selecting from the links for each entry, listed below in groups according to their purpose and alphabetically on the I/O Options section page.
Descriptions for individual Subcase Information Entries can be accessed by selecting from the links for each entry, listed below in groups according to their purpose and alphabetically on the Subcase Information Section page.
Guidelines for using Bulk Data Entries are listed in Bulk Data Guidelines.
Alphabetical listing of the I/O Options Entries.
Alphabetical listing of the Subcase Information Entries.
Bulk Data Entry Defines acceleration loads to all grids in the model. These loads can either be constant or vary in a particular direction over sections of the model.
Bulk Data Entry Defines static acceleration loads at specific GRID points in the model.
Bulk Data Entry Defines static acceleration loads at a specific SET of GRID points in the model. Additionally, scale factors for varying direction acceleration loads can be defined using tabular data.
Bulk Data Entry Defines model parameters for the fluid-structure interface.
Bulk Data Entry Defines acoustic source as a function of power versus frequency.
Bulk Data Entry Defines a component for use in monitoring point definition or external splines.
Bulk Data Entry Defines real numbers for Aeroelastic Analysis.
Bulk Data Entry Defines relationships between on among AESTAT and AESURF entries.
Bulk Data Entry Defines a list of aerodynamic box IDs.
Bulk Data Entry Defines basic parameters for dynamic aeroelasticity.
Bulk Data Entry Defines basic parameters for static aeroelasticity.
Bulk Data Entry Specifies rigid body motions to be used as trim variables in static aeroelasticity.
Bulk Data Entry Specifies an aerodynamic control surface as a member of the set of aerodynamic extra points. The forces associated with this controller will be derived from rigid rotation of the aerodynamic model about the hinge line(s).
Bulk Data Entry Defines the boundary degrees-of-freedom of a superelement assembly for matrix reduction.
Bulk Data Entry Corrects the acceleration record to avoid displacement shift.
Bulk Data Entry Indicates the beginning of data that is used to describe a specific entity (or entities) for inclusion in a model. The BEGIN entry is used in conjunction with the END entry to define the data required for a specific entity.
Bulk Data Entry Defines the blank holder force in a one-step stamping simulation.
Bulk Data Entry Defines quad or tria faces that are in turn used to define a barrier to limit the total deformation for free-shape design regions.
Bulk Data Entry Defines the degrees-of-freedom to be fixed during DMIG generation using CMSMETH card.
Bulk Data Entry Defines the fixed (B-set) degrees-of-freedom to be fixed during DMIG generation using CMSMETH card.
Bulk Data Entry Defines the free (C-set) degrees-of-freedom to be fixed during DMIG generation using CMSMETH card.
Bulk Data Entry Defines the degrees-of-freedom to be free during DMIG generation using CMSMETH card.
Bulk Data Entry Defines the surface, coordinate system, and parameters required to request Bore Deformation output for Static Analysis Subcases.
Bulk Data Entry Boundary Degrees-of-Freedom of a Superelement Assembly.
Bulk Data Entry Fixed Boundary Degrees-of-Freedom of a Superelement Assembly.
Bulk Data Entry Defines the frequency-dependent fluid acoustic absorber element in coupled fluid-structural analysis.
Bulk Data Entry Defines an Acoustic Infinite Element with a triangular base.
Bulk Data Entry Defines an Acoustic Infinite Element with a quadrilateral base.
Bulk Data Entry Defines an interface for forced convection heat transfer using CAFLUID.
Bulk Data Entry Defines an acoustic Adaptive Perfectly Matched Layer (APML) element with a triangular base.
Bulk Data Entry Defines an acoustic Adaptive Perfectly Matched Layer (APML) element with a quadrilateral base.
Bulk Data Entry Defines an aerodynamic macro element (panel) in terms of two leading edge locations and side chords. This is used for Vortex Lattice Method (VLM) and Doublet Lattice Method (DLM) in subsonic aeroelastic analysis.
Bulk Data Entry Defines a 1D element that can conduct heat and transmit fluid between its two primary nodes.
Bulk Data Entry Defines a simple beam element (BAR) of the structural model.
Bulk Data Entry Defines a beam element (BEAM) of the structural model.
Bulk Data Entry Defines a generalized spring-damper structural element.
Bulk Data Entry Defines a one-dimensional spring-damper structural element.
Bulk Data Entry Defines a scalar damper element.
Bulk Data Entry Defines a scalar damper element without reference to a property entry.
Bulk Data Entry Defines a scalar damper element that is connected only to scalar points.
Bulk Data Entry Defines a scalar damper element that is connected only to scalar points and is without reference to a material or property entry.
Bulk Data Entry Defines a current density on the face of solid elements (HEXA, PENTA, TETRA, PYRA) or on the side of shell elements (TRIA3, TRIA6, QUAD4, QUAD8), in Electrical analysis.
Bulk Data Entry Can be used in the component dynamic synthesis method for generating component dynamic matrices at each loading frequency.
Bulk Data Entry Defines a scalar spring element of the structural model.
Bulk Data Entry Defines a scalar spring element of the structural model without reference to a property entry.
Bulk Data Entry Defines a scalar spring element of the structural model without reference to a property entry. The corresponding properties on this entry are not affected by translational and rotational stiffness limits specified using PARAM,ELASSTIF.
Bulk Data Entry Defines a scalar spring element that connects only to scalar points.
Bulk Data Entry Defines a scalar spring element that is connected only to scalar points without reference to a property entry.
Bulk Data Entry Defines a scalar spring element that is connected only to scalar points without reference to a property entry. The corresponding properties on this entry are not affected by translational and rotational stiffness limits specified using PARAM,ELASSTIF.
Bulk Data Entry Defines a unit cell comprised of lattice entities which can be used for space filling via the DLATTICE entry.
Bulk Data Entry Define a fastener with material orientation connecting two shell surfaces.
Bulk Data Entry Defines a fastener which can be used to model connections such as spot welds, rivets, bolts and so on.
Bulk Data Entry Defines a gap or friction element.
Bulk Data Entry Defines a node-to-obstacle gap element. The obstacle may be an element face or a patch of nodes.
Bulk Data Entry Defines the connections of the GASK6 solid gasket element.
Bulk Data Entry Defines the connections of the GASK8 solid gasket element.
Bulk Data Entry Defines the connections of the GASK12 solid gasket element.
Bulk Data Entry Defines the connections of the GASK16 solid gasket element.
Bulk Data Entry Defines the acoustic absorber element in coupled fluid-structural analysis.
Bulk Data Entry Defines a point electric charge at a grid or a set of grids.
Bulk Data Entry Defines a surface element for application of thermal boundary condition.
Bulk Data Entry Defines the connections of the HEXA solid element.
Bulk Data Entry Defines the charge density on faces of CHEXA, CPENTA, CTETRA, or CPYRA solid elements.
Bulk Data Entry Defines the charge density on a volume of CHEXA, CPENTA, CTETRA, or CPYRA solid elements.
Bulk Data Entry Defines the connections of the cohesive element.
Bulk Data Entry Defines parameters for clearance and threaded bolts geometry.
Bulk Data Entry Defines a scalar mass element.
Bulk Data Entry Defines a scalar mass element without reference to a property entry.
Bulk Data Entry Defines a scalar mass element that is connected only to scalar points.
Bulk Data Entry Defines a scalar mass element that is connected only to scalar points, without reference to a property entry.
Bulk Data Entry Defines a beam element for multibody dynamics solution sequence without reference to a property entry.
Bulk Data Entry Defines a beam element for multibody dynamic solution sequence without reference to a property entry based on markers.
Bulk Data Entry Defines a bushing element without reference to a property entry.
Bulk Data Entry Defines a bushing element without reference to a property entry based on markers.
Bulk Data Entry Defines the CMS (Component Mode Synthesis) method, frequency upper limit, number of modes, and starting SPOINT ID to be used in a CMS solution.
Bulk Data Entry Defines a spring damper element without reference to a property entry for multibody solution sequence.
Bulk Data Entry Defines a spring damper element without reference to a property entry for multibody solution sequence based on marker.
Bulk Data Entry Defines parameters for contact (S2S and N2S) interference.
Bulk Data Entry Defines parameters for the contact (S2S and N2S) lock in the preloaded Linear Analysis subcase.
Bulk Data Entry Defines parameters for stabilization control of contact (S2S and N2S) and gap elements (CGAP/CGAPG). This entry is supported with nonlinear static and nonlinear transient analysis types for both small and large displacement cases.
Allows referencing a combined free convection definition via multiple CONVG Bulk Data Entries.
Bulk Data Entry Defines a 6x6 mass matrix at a geometric grid point.
Bulk Data Entry Defines a concentrated mass at a grid point of the structural model.
Bulk Data Entry Define equivalence for degrees of freedom of grid points of two sections of the same model (Format 2) or different parts in a Parts and Instances Model (Format 1) within a specified tolerance.
Bulk Data Entry Defines a rod element without reference to a property entry.
Bulk Data Entry Defines a contact interface.
Bulk Data Entry Defines the default properties of all contacts and sets parameters that affect all contacts.
Bulk Data Entry Defines a free convection boundary condition for heat transfer analysis through connection to a surface element (CHBDYE card).
Bulk Data Entry Defines Free convection via automatic generation of free convection entries. This entry also supports subcase-dependent free convection.
Bulk Data Entry Defines a cylindrical coordinate system using three grid points. The first point is the origin, the second lies on the Z-axis, and the third lies in the X-Z plane.
Bulk Data Entry Defines a rectangular coordinate system using three grid points. The first point is the origin, the second lies on the Z-axis, and the third lies in the X-Z plane.
Bulk Data Entry Defines a spherical coordinate system using three grid points. The first point is the origin, the second lies on the Z-axis, and the third lies in the X-Z plane.
Bulk Data Entry Defines a cylindrical coordinate system using three grid points specified with respect to a reference coordinate system.
Bulk Data Entry Defines a rectangular coordinate system by using three grid points.
Bulk Data Entry Defines a spherical coordinate system three grid points.
Bulk Data Entry Defines a rectangular coordinate system using three grid points. The first point is the origin, the second lies on the X-axis, and the third lies in the X-Y plane.
Bulk Data Entry Defines a rectangular coordinate system using three grid points specified with respect to the basic coordinate system.
Bulk Data Entry Defines a coupler connecting two or three joints.
Bulk Data Entry Defines the connections of the CPENTA element.
Bulk Data Entry Defines the connections of the PYRA solid element.
Bulk Data Entry Defines a 2D axisymmetric quadrilateral cross-section ring element.
Bulk Data Entry Defines a quadrilateral cross-section general axisymmetric element that allows circumferential deformation.
Bulk Data Entry Defines a plane strain quadrilateral element in x-z or x-y plane.
Bulk Data Entry Plane stress quadrilateral element connection. Defines a plane stress quadrilateral element in the x-z or x-y plane.
Bulk Data Entry Defines a quadrilateral plate element (QUAD4) of the structural model. This element uses a 6 degree-of-freedom per node formulation.
Bulk Data Entry Defines a curved quadrilateral shell element with eight grid points.
Bulk Data Entry Equivalent to CQUAD4. Unlike other Nastran codes, a 6 degree-of-freedom per node formulation is used for all shell elements.
Bulk Data Entry Defines a tension-compression-torsion element (ROD) of the structural model.
Bulk Data Entry Defines a seam weld connecting two shell surfaces.
Bulk Data Entry Defines a two-noded element used in the definition of arbitrary beam cross-sections.
Bulk Data Entry Defines a 1st order, three-noded element used in the definition of arbitrary beam cross-sections.
Bulk Data Entry Defines a 1st order, four-noded element used in the definition of arbitrary beam cross-sections.
Bulk Data Entry Defines a planar, 2nd order, six-noded element used in the definition of arbitrary beam cross-sections.
Bulk Data Entry Defines a planar 2nd order, eight-noded element used in the definition of arbitrary beam cross-sections.
Bulk Data Entry Defines a shear panel element.
Bulk Data Entry Defines the Exterior grid points for One-Step Superelement Analysis.
Bulk Data Entry Defines an axisymmetric triangular cross-section ring element.
Bulk Data Entry Defines a triangular cross-section general axisymmetric element that allows circumferential deformation.
Bulk Data Entry Defines the connections of the CTETRA element.
Bulk Data Entry Defines a plane strain triangular element in x-z or x-y plane.
Bulk Data Entry Plane stress triangular element connection. Defines a plane stress triangular element in the x-z or x-y plane.
Bulk Data Entry Defines a triangular plate element (TRIA3) of the structural model. This element uses a 6 degree-of-freedom per node formulation.
Bulk Data Entry Defines a curved triangular shell element with six grid points.
Bulk Data Entry CTRIAR entry is equivalent to CTRIA3. Unlike other Nastran codes, a 6 degrees-of-freedom per node formulation is used for all shell elements.
Bulk Data Entry Defines a tension-compression-torsion element (TUBE) of the structural model.
Bulk Data Entry Defines a static point current at a grid or a set of grids, by specifying a vector, in Electrical analysis.
Bulk Data Entry Defines a viscous damper element.
Bulk Data Entry Defines a weld or fastener connecting two surface patches or points.
Bulk Data Entry Used to list the grids that lie on the axis of symmetry, in cyclic symmetry analysis.
Bulk Data Entry Defines points on one of the boundaries that connect to adjacent segments in cyclic symmetry analysis.
Bulk Data Entry Specifies the number of segments, in a cyclic symmetry analysis.
Bulk Data Entry Defines scale (area) factors for dynamic loads. DAREA is used in conjunction with RLOAD1, RLOAD2, TLOAD1, and TLOAD2 entries.
Bulk Data Entry Defines manufacturing constraints for composite sizing optimization.
Bulk Data Entry Creates a combination of several DCONSTR sets that can be referenced by a subcase.
Bulk Data Entry Defines design constraint upper and lower bounds where response is defined by DRESP1, DRESP2, and DRESP3 cards.
Bulk Data Entry Define real, discrete design variable values for discrete variable optimization or to define relative rotor spin rates in rotor dynamics.
Bulk Data Entry Defines enforced axial deformation for one-dimensional elements for use in statics problems.
Bulk Data Entry Defines the time delay term in the equations of the dynamic loading function. DELAY is used in conjunction with RLOAD1, RLOAD2, TLOAD1, and TLOAD2 entries.
Bulk Data Entry Specifies one or more equations for use in optimization.
Bulk Data Entry Defines a design variable.
Bulk Data Entry Defines an override for design variable settings.
Bulk Data Entry Defines input parameters required for the Global Search Option (GSO).
Bulk Data Entry Defines a link between a DIM# field on a PBARL or PBEAML property and either the thickness on a PSEC definition or the y or z coordinate on a GRIDS definition; it is used in the definition of arbitrary beam cross-sections.
Bulk Data Entry Specifies the number of Divergence pressures and Mach numbers for a static aeroelastic divergence analysis.
Bulk Data Entry Defines parameters for filling a space with lattice-based unit cells. The presence of this entry also activates the creation of unit cells to fill the target volume.
Bulk Data Entry Defines a link between one design variable and one or more other design variables.
Bulk Data Entry Defines a link of one design variable to one or more other design variables defined by a DEQATN card. The equation inputs come from the referenced DESVAR values and the constants defined on the DTABLE card.
Bulk Data Entry Defines a dynamic loading condition for frequency response problems as a linear combination of load sets defined via RLOAD1 and RLOAD2 entries, or for transient problems as a linear combination of load sets defined via TLOAD1 and TLOAD2 entries, or acoustic source ACSRCE entries.
Bulk Data Entry Defines the damage evolution.
Bulk Data Entry Defines the damage initiation criteria.
Bulk Data Entry Defines matrix (real) data blocks for Aeroelastic Analysis.
Bulk Data Entry Defines direct input matrices related to grid points. The matrix is defined by a single header entry and one or more column entries. A column entry is required for each column with non-zero elements.
Bulk Data Entry Defines changes in the contents of a super element from H3DDMIG input.
Bulk Data Entry Controls rotation and other specifications for a matrix entered using DMIG entry.
Bulk Data Entry Defines a response and its reference values for a minmax (maxmin) optimization problem.
Bulk Data Entry Defines design optimization parameters by overriding the defaults.
Bulk Data Entry Defines the phase lead term in the equation of the dynamic loading function. DPHASE is used in conjunction with RLOAD1 and RLOAD2 entries.
Bulk Data Entry Defines the draping data for plies used in ply-based composite definition.
Bulk Data Entry Creates a combination of several DREPORT sets that can be referenced by a subcase.
Bulk Data Entry Used in the Bulk Data section to report responses, defined by DRESP1, DRESP2 and DRESP3 cards, to the output file, which are not constrained or used as the objective function, as defined by the optimization problem.
Bulk Data Entry A response or a set of responses that are the result of a design analysis iteration. These responses can be used as a design objective or as design constraints.
Bulk Data Entry When a desired response is not directly available from OptiStruct, it may be calculated using DRESP2.
Bulk Data Entry The DRESP3 card identifies the external function to be called and defines the parameters to be transferred to that function.
Bulk Data Entry Defines design response screening data.
Bulk Data Entry Defines parameters for classic and grid-based free-shape design variables.
Bulk Data Entry Defines parameters for the generation of composite shuffling design variables.
Bulk Data Entry Defines parameters for the generation of free-size design variables.
Bulk Data Entry Defines responses and their target values for a system identification problem.
Bulk Data Entry List of constants to be used in functions defined by DEQATN.
Bulk Data Entry Correlates spectra lines specified on TABLED1 entries with damping values.
Bulk Data Entry Defines units for multibody, component mode synthesis (flexible-body preparation), and Explicit Dynamic Analysis sequences.
Bulk Data Entry Defines parameters for the generation of topography design variables.
Bulk Data Entry Defines parameters for the generation of topology design variables.
Bulk Data Entry Activates Truss Layout Optimization and defines the corresponding parameters for design optimization, including truss cross-sectional area limits, stress, symmetry, and buckling constraints.
Bulk Data Entry Relates Design Variables to Analysis Model Element Properties
Bulk Data Entry Relates design variables to an analysis model element property using a relationship defined by a DEQATN card. The equation inputs come from the referenced DESVAR values and constants defined on a DTABLE card.
Bulk Data Entry Defines the relationship between a design variable and a grid point location.
Bulk Data Entry Linearly relates a design variable to an analysis model element.
Bulk Data Entry Relates a design variable to an analysis model loading using a relationship defined by a DEQATN card. The equation inputs come from the referenced DESVAR values and the constants defined on the DTABLE card.
Bulk Data Entry Linearly relates a design variable to properties of an MBD entity using the equation:
Bulk Data Entry Relates a design variable to properties of MBD entities using a relationship defined by a DEQATN card. The equation inputs come from the referenced DESVAR values and the constants defined on the DTABLE card.
Bulk Data Entry Linearly relates a design variable to an analysis model material property using the equation:
Bulk Data Entry Relates design variables to an analysis model material property using a relationship defined by a DEQATN card. The equation inputs come from the referenced DESVAR values and constants defined on a DTABLE card.
Bulk Data Entry Relates Design Variables to Analysis Model Properties
Bulk Data Entry Relates a design variable to an analysis model property using a relationship defined by a DEQATN card. The equation inputs come from the referenced DESVAR values and the constants defined on the DTABLE card.
Bulk Data Entry Defines geometry and restraining force per unit length for an edge blank holder in a one-step stamping simulation.
Bulk Data Entry Defines location and restraining force per unit length for a draw bead in a one-step stamping simulation.
Bulk Data Entry Defines data required to perform complex eigenvalue analysis.
Bulk Data Entry Defines the data required to perform real eigenvalue analysis with the Automated Multi-Level Sub-structuring technique.
Bulk Data Entry Defines data required to perform eigenvalue extraction using the Lapack-based dense solver.
Bulk Data Entry Defines data required to perform real eigenvalue analysis (vibration or buckling) with the Lanczos method.
Bulk Data Entry Used to assign material ID to elements.
Bulk Data Entry Used to assign property ID to elements in DMIG.
Bulk Data Entry Resets the default values of the warning and error bound limits for element quality check.
Bulk Data Entry Specifies damp shell elements for a fluid volume. ELIST entries are referenced by the MFLUID entry.
Bulk Data Entry The END Bulk Data Entry indicates the end of data that is used to describe a specific entity (or entities) for inclusion in a model. The END entry is used in conjunction with the BEGIN entry to define the data required for a specific entity.
Bulk Data Entry Defines one or more sets of elements as panels for equivalent radiated power output for a frequency response analysis.
Bulk Data Entry Defines a combined time step selection set as a union of selected time steps defined via ESLTIME entries for Geometric Nonlinear ESLM optimization or a Multibody Dynamics ESLM optimization.
Bulk Data Entry Defines time step selection control for geometric nonlinear response ESL Optimization and Multibody dynamics ESLM optimization.
Bulk Data Entry Defines boundary connections for an external superelement.
Bulk Data Entry Defines elements or grids, and associated fatigue properties, for consideration in a fatigue analysis.
Bulk Data Entry Defines loading events for Fatigue Analysis.
Bulk Data Entry Defines fatigue loading parameters.
Bulk Data Entry Used to define parameters required for a Fatigue Analysis.
Bulk Data Entry Defines the solder joint for consideration in solder fatigue analysis.
Bulk Data Entry Used to define parameters and property identification data for Seam Weld Fatigue Analysis.
Bulk Data Entry Defines a loading sequence for a Fatigue Analysis.
Bulk Data Entry Defines a forming limit curve as a table of minor and major strain values in a one-step stamping simulation.
Bulk Data Entry Used to specify the aerodynamic factors in aerodynamic flutter analysis.
Bulk Data Entry Defines parameters for the calculation follower loads in large displacement nonlinear analysis.
Bulk Data Entry Used to specify the parameters required for aerodynamic flutter analysis.
Bulk Data Entry Defines a static force at a grid point or a SET of grid points by specifying a vector.
Bulk Data Entry Used to define a static force by specification of a value and two grid points that determine the direction.
Bulk Data Entry Used to define a static force by specification of a value and four grid points that determine the direction.
Bulk Data Entry Defines a set of frequencies to be used in the solution of frequency response problems.
Bulk Data Entry Defines a set of frequencies to be used in the solution of frequency response problems by specification of a starting frequency, frequency increment, and the number of increments desired.
Bulk Data Entry Defines a set of frequencies to be used in the solution of frequency response problems by specification of a starting frequency, final frequency, and the number of logarithmic increments desired.
Bulk Data Entry Defines a set of frequencies for the modal method of frequency response analysis by specifying the number of frequencies between modal frequencies.
Bulk Data Entry Defines a set of frequencies for the modal method of frequency response analysis by specifying the amount of "spread" around each modal frequency and the number of equally spaced frequencies within the spread.
Bulk Data Entry Defines a set of frequencies for the modal method of frequency response analysis by specification of a frequency range and fractions of the natural frequencies within that range.
Bulk Data Entry Defines the settings for Fluid-Structure Interaction Analysis with AcuSolve.
Bulk Data Entry Defines parameters that control connectivity and configuration checks for gap elements (CGAP and CGAPG). Most of these parameters also affect contact elements that are automatically created on CONTACT interfaces - see individual descriptions for details.
Bulk Data Entry Defines the stiffness, flexibility, mass, viscous damping, or structural damping of a general element connected to an arbitrary number of grids.
Bulk Data Entry Defines equivalence for all degrees of freedom of grid points of two different subsets of without any requirement that these two subsets are closely located to one another.
Bulk Data Entry Defines the gravity vectors for use in determining gravity loading for the static structural model. It can also be used to define the EXCITEID field (Amplitude "A") of dynamic loads in RLOAD1, RLOAD2, TLOAD1, TLOAD2 and NLOAD1 Bulk Data Entries for dynamic solution sequences.
Bulk Data Entry Defines default options for fields 3, 7, and 8 of all GRID entries.
Bulk Data Entry Defines the location of a geometric grid point of the structural model, the directions of its displacement, and its permanent single-point constraints or permanent zero electric potential.
Bulk Data Entry Defines a grid point on the y-z plane, using cartesian coordinates, for use in the definition of arbitrary beam cross-sections.
Bulk Data Entry Defines a ground body out of a list of finite element properties, elements, and grid points.
Bulk Data Entry Defines hourglass control parameters to reduce spurious zero-energy modes in elements with reduced integration.
Bulk Data Entry Defines the application of modal damping to the residual structure in a Direct Transient or Frequency Response analysis.
Bulk Data Entry Define the initial geometric imperfection at the beginning of a nonlinear analysis.
Bulk Data Entry Defines initial stress values and settings for elements in nonlinear analysis.
Bulk Data Entry Defines the Inlet velocity for Darcy Flow Analysis.
Bulk Data Entry The INSTNCE Bulk Data Entry can be used to define the location of a part in the global structure. Each INSTNCE entry should reference a unique part name.
Bulk Data Entry Defines initial velocity in a multibody situation.
Bulk Data Entry Defines initial velocity of a joint in a multibody situation.
Bulk Data Entry Defines initial stress condition for nonlinear quasi-static analysis as a union of INISTRS entries.
Bulk Data Entry Defines a joint for Multibody Dynamics.
Bulk Data Entry Defines a joint connection between two grids.
Bulk Data Entry Defines a joint using two grids which have a marker card associated with them. Joints are only valid in a multibody solution sequence.
Bulk Data Entry Defines the parameters available for Lattice Optimization Control.
Bulk Data Entry The LOAD is equivalent to the LOADADD.
Bulk Data Entry Defines a static load as a linear combination of load sets defined via FORCE, MOMENT, FORCE1, MOMENT1, PLOAD, PLOAD1, PLOAD2, PLOAD4, RFORCE, DAREA, ACCEL, ACCEL1, ACCEL2, GRAV and LOADADD entries.
Bulk Data Entry Used to define the harmonic coefficients of loading, in cyclic symmetry analysis.
Bulk Data Entry Used to define the loading, in cyclic symmetry analysis.
Bulk Data Entry Defines loading for joint connector JOINTG Bulk Data Entry.
Bulk Data Entry The LOCATE Bulk Data Entry can be used to define the location of a part in the global structure. Each LOCATE entry should reference a unique part name. LOCATE Bulk Data Entries are activated in each subcase by the LOCATE Subcase Entry.
Bulk Data Entry Used to map results to the model (OptiStruct) from other external result files.
Bulk Data Entry Define a marker by associating a grid and a coordinate system.
Bulk Data Entry Defines a linear combination of mass cases to form the subcase dependent mass.
Bulk Data Entry Defines the material properties for linear, temperature-independent, and isotropic materials.
Bulk Data Entry Defines constant electrical material properties for resistivity and Joule heat fraction in electrical analysis.
Bulk Data Entry Defines isotropic permittivity and damping for dielectric materials.
Bulk Data Entry Defines the material properties for linear, temperature-independent, and anisotropic materials for two-dimensional elements.
Bulk Data Entry Defines the electrical material properties for anisotropic materials in electrical analysis.
Bulk Data Entry Defines anisotropic permittivity and damping for dielectric materials
Bulk Data Entry Defines the material properties for linear, temperature-independent, and orthotropic materials used by the CTAXI, CTRIAX6, CQAXI, CTAXIG, and CQAXIG axisymmetric elements, and CTPSTN and CQPSTN plane strain elements.
Bulk Data Entry Defines constant thermal material properties for conductivity, density, and heat generation.
Bulk Data Entry Defines the thermal material properties for anisotropic materials.
Bulk Data Entry Defines the material properties for linear temperature-independent orthotropic material for two-dimensional elements.
Bulk Data Entry Defines the material properties for linear, temperature-independent, and anisotropic materials for solid elements.
Bulk Data Entry Defines the material properties for linear, temperature-independent, and orthotropic materials for solid elements in terms of engineering constants.
Bulk Data Entry Defines material properties for fluid elements in coupled fluid-structural analysis.
Bulk Data Entry Defines the material properties for Brittle Damage material models.
Bulk Data Entry Defines material properties and failure model parameters for Failure criteria calculations.
Bulk Data Entry Defines material properties for fatigue analysis.
Bulk Data Entry Specifies frequency-dependent material properties on MAT1 entry fields via TABLEDi entries.
Bulk Data Entry Specifies frequency-dependent material properties on MAT2 entry fields via TABLEDi entries.
Bulk Data Entry Specifies frequency-dependent material properties on MAT3 entry fields via TABLEDi entries.
Bulk Data Entry Specifies frequency-dependent material properties on MAT8 entry fields via TABLEDi entries.
Bulk Data Entry Specifies frequency-dependent material properties on MAT9 entry fields via TABLEDi entries.
Bulk Data Entry Specifies frequency-dependent material properties on MAT10 entry fields via TABLEDi entries.
Bulk Data Entry Defines material properties for frequency-dependent viscoelastic materials.
Bulk Data Entry Defines material properties for nonlinear hyperelastic materials. The Polynomial form is available and various material types topics/solvers/os/mathe_bulk_r.html#mathe_bulk_r__mathe_bulk_r_fn_jgc_4dt_b1b can be defined by specifying the corresponding coefficients.
Bulk Data Entry Defines the material properties in a one-step stamping simulation.
Bulk Data Entry Defines material properties and parameters through an interface to Altair Multiscale Designer® allowing you to include a much wider range of different material models.
Bulk Data Entry Defines the material properties for poro-elastic materials.
Bulk Data Entry Defines the coupling terms between structural and dielectric materials for defining a piezoelectric coupling.
Bulk Data Entry Specifies strain-, rate-, and temperature-dependent material properties for use in applications involving nonlinear materials.
Bulk Data Entry Specifies temperature-dependent material properties on MAT1 entry fields via TABLEMi or TABLEG entry.
Bulk Data Entry Defines temperature-dependent material properties for the corresponding MAT1EC Bulk Data Entry fields via TABLEMi or TABLEG entries.
Bulk Data Entry Defines temperature-dependent isotropic permittivity via the TABLEM1-4 or TABLEG Bulk Data Entries for dielectric materials.
Bulk Data Entry Specifies temperature-dependent material properties on MAT2 entry fields via TABLEMi or TABLEG entry.
Bulk Data Entry Defines temperature-dependent material properties for the corresponding MAT2EC Bulk Data Entry fields via TABLEMi or TABLEG entries.
Bulk Data Entry Defines temperature-dependent anisotropic permittivity via the TABLEM1-4 or TABLEG Bulk Data Entries for dielectric materials.
Bulk Data Entry Specifies temperature-dependent material properties on MAT3 entry fields via TABLEMi or TABLEG entry.
Bulk Data Entry Defines temperature-dependent material properties for the corresponding MAT4 Bulk Data Entry fields via TABLEMi or TABLEG entry.
Bulk Data Entry Specifies temperature-dependent material properties on MAT8 entry fields via TABLEMi or TABLEG entry.
Bulk Data Entry Specifies temperature-dependent material properties on MAT9 entry fields via TABLEMk or TABLEG entry.
Bulk Data Entry Specifies temperature-dependent material properties on MAT9OR entry fields via TABLEMk or TABLEG entry.
Bulk Data Entry Defines material properties for temperature-dependent nonlinear hyperelastic materials.
Bulk Data Entry Defines temperature-dependent coupling terms between structural and dielectric materials, for defining a piezoelectric coupling.
Bulk Data Entry Defines material properties for temperature-dependent nonlinear viscoelastic materials.
Bulk Data Entry Defines temperature-dependent material properties for the corresponding MATVP Bulk Data Entry fields via TABLEMi or TABLEG entry.
Bulk Data Entry Defines thermal material properties and parameters for user-defined thermal material.
Bulk Data Entry Defines material properties and parameters for user-defined structural material.
Bulk Data Entry Defines material properties for nonlinear viscoelastic materials.
Bulk Data Entry Defines material properties for nonlinear creep materials.
Bulk Data Entry Defines the entity/set that needs to be activated in the multibody system for the subsequent simulation.
Bulk Data Entry Defines a Multibody Contact between a set of nodes and a deformable surface.
Bulk Data Entry Defines a Multibody contact between rigid bodies.
Bulk Data Entry Specifies the data used to define a curve.
Bulk Data Entry Defines a Curve to Curve Constraint.
Bulk Data Entry Defines an ordered list of grids as a Multibody Deformable Curve.
Bulk Data Entry Defines the entity/set that needs to be deactivated in the multibody system for the subsequent simulation.
Bulk Data Entry Defines a multibody deformable surface.
Bulk Data Entry Defines a constant force at a grid point by specifying a vector.
Bulk Data Entry Defines a curve force at a grid point by specifying a vector.
Bulk Data Entry Defines an expression force at a grid point by specifying a vector.
Bulk Data Entry Defines the parameters for a multibody system linear analysis.
Bulk Data Entry Defines a constant moment at a grid point by specifying a vector.
Bulk Data Entry Defines a curve moment at a grid point by specifying a vector.
Bulk Data Entry Defines an expression moment at a grid point by specifying a vector.
Bulk Data Entry Defines a Multibody Parametric Curve using node sets.
Bulk Data Entry Defines a Point to Parametric Curve Constraint.
Bulk Data Entry Defines a Point to Deformable Curve Constraint.
Bulk Data Entry Defines a Point to Deformable Surface Constraint.
Bulk Data Entry Defines a multibody as a combination of request sets defined via MBREQE and MBREQM.
Bulk Data Entry Defines a multibody solver output request to output the results of a set of expressions.
Bulk Data Entry Defines a multibody solver output request to output displacement, velocity, acceleration, or force with respect to markers.
Bulk Data Entry Defines the simulation sequence for the multibody solver.
Bulk Data Entry Defines a constant scalar load on two grid points.
Bulk Data Entry Defines a curve scalar load on two grid points.
Bulk Data Entry Defines an expression scalar load on two grid points.
Bulk Data Entry Defines the parameters for a multibody simulation.
Bulk Data Entry Defines the simulation parameters for subsequent multibody simulation.
Bulk Data Entry Defines a constant scalar moment on two gird points along the specified vector.
Bulk Data Entry Defines a curve scalar moment on two grid points along the specified vector.
Bulk Data Entry Defines an expression scalar moment on two grid points along the specified vector.
Bulk Data Entry Defines a multibody solver variable which can be referred to by multiple expressions.
Bulk Data Entry Defining the material properties of cast iron material for use in applications involving nonlinear materials.
Bulk Data Entry Defines the material properties for potential-based cohesive material models.
Bulk Data Entry Defines the material properties for damage-based cohesive material models.
Bulk Data Entry This entry is used to group element sets for which MEFFMASS output is desired in HyperMesh set based format.
Bulk Data Entry Defines options for user-defined input of frequency ranges used to define bands in adaptive meshing for acoustic Adaptive Perfectly Matched Layer (APML) analysis.
Bulk Data Entry METADATA indicates the beginning of metadata content that is to be passed to the OUTPUT2 (.op2 file).
Bulk Data Entry Used to define properties of a virtual fluid mass. A virtual fluid mass mimics the mass effect of an incompressible inviscid fluid in contact with a structure.
Bulk Data Entry Defining the material properties for gasket-like materials.
Bulk Data Entry To input a table of Mach numbers (M) and reduced frequencies (K) for aerodynamic matrix calculation, in unsteady aerodynamic analysis.
Bulk Data Entry To input a table of Mach number (M) and reduced frequency (K) pairs for aerodynamic matrix calculation, in unsteady aerodynamic analysis.
Bulk Data Entry Defines a multibody as a linear combination of load sets defined via GRAV, MBFRC, MBFRCC, MBFRCE, MBMNT, MBMNTC, MBMNTE, MBSFRC, MBSFRCC, MBSFRCE, MBSMNT, MBSMNTC, and MBSMNTE.
Bulk Data Entry Defines parameters for removing and/or reactivating contact interfaces and/or elements.
Bulk Data Entry Options for displacement and energy results, based on eigenvectors from PFMODE modal participation.
Bulk Data Entry Defines parameters for mode tracking in optimizations with eigenvalue analysis.
Bulk Data Entry Defines a static moment at a grid point or a SET of grid points by specifying a vector.
Bulk Data Entry Defines a static moment by specification of a value and two grid points, which determines the direction.
Bulk Data Entry Defines a static moment by specification of a value and four grid points, which determines the direction.
Bulk Data Entry Defines an integrated load monitor point at a point (x,y,z) in a user-defined coordinate system. The integrated loads about this point over the associated loads will be computed and printed to the .monpnt file.
Bulk Data Entry Define an integrated load monitor point for specific elements and to output results for these elements.
Bulk Data Entry Sums select Grid Point Forces to a user chosen monitor point.
Bulk Data Entry Defines a one-chamber gas filled structure with hybrid input of inflated gas.
Bulk Data Entry Defines a multibody as a combination of motion sets defined via MOTNJ, MOTNJC, MOTNJE, MOTNG, MOTNGC, and MOTNGE.
Bulk Data Entry Defines a constant grid point motion.
Bulk Data Entry Defines a grid point motion versus time by specifying a curve.
Bulk Data Entry Defines a grid point motion through an expression.
Bulk Data Entry Defines a constant joint motion.
Bulk Data Entry Defines a joint motion versus time by specifying a curve.
Bulk Data Entry Defines a joint motion through an expression.
Bulk Data Entry Defines motion for joint connector JOINTG Bulk Data Entry.
Bulk Data Entry The MPC Bulk Data Entry defines a multipoint constraint equation of the form.
Bulk Data Entry Defines a multipoint constraint set as a union of multipoint constraint sets defined via MPC entries.
Bulk Data Entry Defines parameters for time-stepping and convergence criteria in Nonlinear Analysis.
Bulk Data Entry Uses keywords to define various control parameters for both Nonlinear Static and Nonlinear Transient Analysis.
Bulk Data Entry Defines parameters for energy variables printout for implicit nonlinear static, implicit nonlinear transient analyses, and explicit dynamic analysis.
Bulk Data Entry Defines the settings for runtime monitoring of nonlinear analysis.
Bulk Data Entry Defines incremental result output parameters for Nonlinear Implicit Analysis (static and transient) and Nonlinear Explicit Analysis.
Bulk Data Entry Defines parameters for Nonlinear Static Analysis, Nonlinear Transient Analysis, and Nonlinear Heat Transfer Analysis solution control.
Bulk Data Entry Define the parameters for arc-length method to solve post-buckling problems in nonlinear static analysis.
Bulk Data Entry Controls the printing of certain information to the _nl.out file for nonlinear analysis.
Bulk Data Entry Defines a nonlinear radial (circular) gap for direct transient response analysis.
Bulk Data Entry Defines nonlinear transient forcing functions of the form.
Bulk Data Entry Defines non-structural material damping for a list of elements or properties.
Bulk Data Entry Defines non-structural material damping as the sum of the sets listed.
Bulk Data Entry Defines non-structural mass per unit Length, per unit Area, or per unit Volume for a list of elements or properties.
Bulk Data Entry Defines non-structural mass per unit area or per unit length for a list of elements or properties.
Bulk Data Entry Defines non-structural mass as the sum of the sets listed.
Bulk Data Entry Defines lumped non-structural mass for a list of elements or properties.
Bulk Data Entry Defines the properties of the fluid acoustic absorber element.
Bulk Data Entry Defines the properties of an acoustic absorber element.
Bulk Data Entry Defines the properties of Acoustic Infinite Elements.
Bulk Data Entry Defines the properties of acoustic Adaptive Perfectly Matched Layer (APML) elements.
Bulk Data Entry Defines properties for CAERO1 panels. This is used for Vortex Lattice Method (VLM) and Doublet Lattice Method (DLM) in subsonic aeroelastic analysis.
Bulk Data Entry Defines the properties of a 1D CAFLUID heat flow element.
Bulk Data Entry Defines up to four sets of grid points or elements as panels for panel participation output for a frequency response analysis of a coupled fluid-structural model.
Bulk Data Entry Defines a set of grid points and/or elements as a generic panel.
Bulk Data Entry Defines values for parameters used during analysis and optimization.
Bulk Data Entry Defines the properties of 2D axisymmetric elements. Referenced by CTAXI and CQAXI entries.
Bulk Data Entry Defines the properties of general axisymmetric elements. References by the CTAXIG and CQAXIG elements.
Bulk Data Entry Defines the properties of a simple beam (bar), which is used to create bar elements via the CBAR entry.
Bulk Data Entry Defines the properties of a simple beam (bar) by cross-sectional dimensions, which is used to create bar elements via the CBAR entry.
Bulk Data Entry Defines the properties of beam elements defined via the CBEAM entry.
Bulk Data Entry Defines the properties of a beam element by cross-sectional dimensions that are used to create beam elements via the CBEAM entry.
Bulk Data Entry Defines the nominal property values for a generalized spring-damper-mass structural element.
Bulk Data Entry Defines the linear and nonlinear properties for a one-dimensional spring-and-damper structural element.
Bulk Data Entry Defines the various nominal property values for a generalized spring-damper-mass structural element. This property is not affected by translational and rotational stiffness limits specified using PARAM, BUSHSTIF.
Bulk Data Entry Defines property values for a generalized spring and damper structural element.
Bulk Data Entry Defines the properties for cohesive elements.
Bulk Data Entry Defines the structure and properties of an n-ply composite laminate material.
Bulk Data Entry Defines the structure and properties of a composite laminate material, allowing for global ply identification.
Bulk Data Entry Defines global ply-based composite properties for continuum shell composites.
Bulk Data Entry Defines the properties of a composite laminate material used in ply-based composite definition.
Bulk Data Entry Defines properties of a CONTACT interface.
Bulk Data Entry Defines Contact Electric Resistance Coefficient (CERC) for CONTACT elements in electrical analysis.
Bulk Data Entry Defines conductance for CONTACT elements in heat transfer analysis.
Bulk Data Entry Defines a free convection boundary condition properties.
Bulk Data Entry Defines the external function to be called to calculate time and temperature-dependent free-convection coefficient in a convection element.
Bulk Data Entry Specifies the damping of a scalar damper element using defined CDAMP1 or CDAMP3 entry.
Bulk Data Entry Defines criteria used for the automatic identification of loading frequencies at which result peaks occur. Other result output may then be requested at these "peak" loading frequencies. This feature is only supported for frequency response solution sequences.
Bulk Data Entry Used to define the stiffness and stress coefficient of a scalar elastic element (spring) by means of the CELAS1 or CELAS3 entry.
Bulk Data Entry Defines the frequency dependent property values for a PELAS Bulk Data Entry. It can also be used to define a nonlinear spring for Nonlinear Analysis via the TKNID field.
Bulk Data Entry Defines a connection between opposite edges/faces of the structure. This entry is used to apply Periodic Boundary Conditions to the model.
Bulk Data Entry Define properties of connector (CFAST) elements.
Bulk Data Entry Defines properties for Fastener Element Connection specified by a CFASTG entry.
Bulk Data Entry Defines element properties for fatigue analysis.
Bulk Data Entry Defines properties for solder fatigue analysis.
Bulk Data Entry Defines properties for Seam Weld Fatigue Analysis.
Bulk Data Entry Defines properties for Spot Weld Fatigue Analysis.
Bulk Data Entry Defines a one-step transfer path analysis.
Bulk Data Entry Defines a flexible body out of a list of finite element properties, elements, and grid points.
Bulk Data Entry Defines properties of the gap (CGAP or CGAPG) elements.
Bulk Data Entry Defines electrical resistance properties for the gap elements (CGAP or CGAPG) in electrical analysis.
Bulk Data Entry Defines heat transfer conduction properties of the gap (CGAP or CGAPG) elements for heat transfer analysis.
Bulk Data Entry Defining the properties for solid gasket elements.
Bulk Data Entry Defines the thickness, material, blank holder, binder and Forming Limit Curve references for a shell property in a one-step stamping simulation.
Bulk Data Entry Defines the properties for a joint connection between two grids via the JOINTG Bulk Data Entry.
Bulk Data Entry Defines a static pressure load on a triangular or quadrilateral element. It can also be used to define the EXCITEID field (Amplitude "A") of dynamic loads in RLOAD1, RLOAD2, TLOAD1 and TLOAD2 Bulk Data Entries.
Bulk Data Entry Defines concentrated, uniformly distributed, or linearly distributed applied loads to the CBAR or CBEAM elements or a SET of such elements at user-chosen points along the axis.
Bulk Data Entry Defines a uniform static pressure load applied to two-dimensional elements, or a SET of such elements.
Bulk Data Entry Defines a load on a face of a HEXA, PENTA, TETRA, PYRA, TRIA3, TRIA6, QUAD4, or QUAD8 element.
Bulk Data Entry Defines an in-plane surface traction on the edge of CTPSTN, CQPSTN, CTPSTS, and CQPSTS elements.
Bulk Data Entry Parameters of pressure loads on a surface defined by a SURF Bulk Data Entry or SET Bulk Data Entry.
Bulk Data Entry Defines a static surface traction on the CQAXI, CTAXI, CTRIAX6, CQAXIG and CTAXIG axisymmetric elements. The PLOADX1 entry can be defined as follower loads in Large Displacement Nonlinear Analysis.
Bulk Data Entry Defines a surface traction on the general axisymmetric elements CQAXIG and CTAXIG.
Bulk Data Entry Defines a one-dimensional dummy element for use in plotting.
Bulk Data Entry Defines a three-noded, two-dimensional dummy element for use in plotting.
Bulk Data Entry Defines a four-noded, two-dimensional dummy element for use in plotting.
Bulk Data Entry Defines the properties of nonlinear hyperelastic solid elements, referenced by CHEXA, CPENTA, and CTETRA Bulk Data Entries. The MATHE hyperelastic material can be referenced to define corresponding material properties.
Bulk Data Entry Defines the properties of a ply used in ply-based composite definition.
Bulk Data Entry Defines the mass value of a scalar mass element (CMASS1 or CMASS3 entry).
Bulk Data Entry Defines the properties of plane strain elements (CTPSTN, CQPSTN, CTPSTS, and CQPSTS).
Bulk Data Entry Defines a rigid body out of a list of finite element properties, elements and grid points.
Bulk Data Entry Defines 1D or 3D pre-tensioned bolt section.
Bulk Data Entry Defines parameters that control initial loading conditions on pretension sections for 1D and 3D bolt pre-tensioning. These parameters also control the printing of diagnostic information about pretension sections.
Bulk Data Entry Defines the properties of a rod, which is referenced by the CROD entry.
Bulk Data Entry Defines a pressure penetration load which can simulate fluid penetrating through the surfaces on a contact interface.
Bulk Data Entry Define properties of connector (CSEAM) elements.
Bulk Data Entry Defines property information for planar section elements used in the definition of arbitrary beam cross-sections.
Bulk Data Entry Defines the properties of a shear panel.
Bulk Data Entry Defines the membrane, bending, transverse shear, and membrane-bending coupling of shell elements.
Bulk Data Entry Defines the properties of solid elements, referenced by CHEXA, CPENTA, CPYRA and CTETRA Bulk Data Entries.
Bulk Data Entry Defines properties of a contact surface.
Bulk Data Entry Defines a pretension load as a linear combination of load sets defined via PTFORCE, PTFORC1, PTADJST and PTADJS1 entries.
Bulk Data Entry Defines adjustment (additional shortening) on a set of pretension sections.
Bulk Data Entry Defines the adjustment (shortening) on a pretension section.
Bulk Data Entry Defines pretensioning force on pretension section.
Bulk Data Entry Defines pretensioning force on a set of pretension sections.
Bulk Data Entry Defines the properties of a thin-walled cylindrical tube element, referenced by a CTUBE entry.
Bulk Data Entry Defines properties of a one-dimensional viscous damping element (CVISC entry).
Bulk Data Entry Defines properties of connector (CWELD) elements.
Bulk Data Entry Defines a uniform heat flux for CHBDYE elements.
Bulk Data Entry Defines the external function to be called to calculate time and temperature-dependent Uniform Heat Flux values.
Bulk Data Entry Defines a rate of volumetric heat addition in a conduction element.
Bulk Data Entry Defines the external function called to calculate time and temperature-dependent rate of volumetric heat addition in a conduction element.
Bulk Data Entry Defines the radiation boundary conditions and identifies CHBDYE entries for heat transfer analysis via radiation.
Bulk Data Entry Defines the radiation material properties of a surface element for heat transfer analysis.
Bulk Data Entry Defines a set of grid points where the sound will be calculated as well as the panels that are generating the sound.
Bulk Data Entry Defines load set power spectral density factors for use in random analysis having the frequency dependent form .
Bulk Data Entry Defines time lag constants for use in random analysis autocorrelation function computation.
Bulk Data Entry Defines a rigid body as a combination of Rigid Bodies (RBODY).
Bulk Data Entry Defines a rigid bar with six degrees-of-freedom at each end.
Bulk Data Entry Defines a rigid body connected to an arbitrary number of grid points.
Bulk Data Entry Defines a rigid body whose independent degrees-of-freedom are specified at a single grid point and whose dependent degrees-of-freedom are specified at an arbitrary number of grid points.
Bulk Data Entry Defines a rigid element connecting two grid points which are closest to the grid point referenced by the field GS.
Bulk Data Entry Defines the motion at a "reference" grid point as the weighted average of the motions at a set of other grid points.
Bulk Data Entry Defines a rigid body as a set of elements, grid points.
Bulk Data Entry Defines a pair of response quantities for computing the cross-power spectral density functions in random response analysis.
Bulk Data Entry Geometrically maps parts (for example, elements and grids) from one location to another. This entry allows you to define mapping as MOVE (translation), ROTATE, MIRROR, or MATCH (as an arbitrary transformation which matches grids from one group to similar grids in another group).
Bulk Data Entry Defines a static loading condition due to a centrifugal force field. It can also be used to define the EXCITEID field (Amplitude "A") of dynamic loads in RLOAD1, RLOAD2 , TLOAD1 and TLOAD2 Bulk Data Entries.
Bulk Data Entry Includes data required to perform Rotor Dynamics analysis in Modal Frequency Response Analysis and/or Modal Complex Eigenvalue Analysis. The RGYRO Bulk Data Entry is referenced by a corresponding RGYRO Subcase Information Entry in a specific subcase.
Bulk Data Entry Defines a Rigid Joint connection at two coincident grids.
Bulk Data Entry Defines a frequency-dependent dynamic load of the form: for use in frequency response problems.
Bulk Data Entry Defines a frequency-dependent dynamic load of the form for use in frequency response problems.
Bulk Data Entry 3D Rotor Definition. Specifies list of sets, elements or properties that comprise the rotor 3D model.
Bulk Data Entry 1D rotor definition. Specifies grids that determine the Rotor Line model.
Bulk Data Entry Defines a pin-ended rod that is rigid in extension.
Bulk Data Entry Specifies directional combination method, modal combination method, excitation direction(s), response spectra and scale factors for Response Spectrum Analysis.
Bulk Data Entry Specifies a set of reference rotor speed values for asynchronous analysis in Rotor Dynamics.
Bulk Data Entry Defines the relative spin rates between rotors and rotor damping parameters during a rotor dynamic analysis in Static, Modal Complex Eigenvalue or Frequency Response solution sequences.
Bulk Data Entry Defines the rotor spin rates and rotor damping parameters with respect to time during a Transient Rotor Dynamics Analysis.
Bulk Data Entry Defines multi-point constraints for the interpolation of displacements at grid points.
Bulk Data Entry Defines multi-point constraints to model clamped connections of shell-to-solid elements.
Bulk Data Entry Defines a set of constraints for shell-to-solid connection on surfaces.
Bulk Data Entry Defines the degrees of freedom where the residual vectors are to be calculated.
Bulk Data Entry Defines superelement boundary search options and the type of superelement.
Bulk Data Entry Defines grid and scalar point connection procedures for a partitioned superelement.
Bulk Data Entry Defines free boundary degrees-of-freedom for One-Step Superelement Analysis.
Bulk Data Entry Defines free boundary degrees-of-freedom to be free for use in One-Step Superelement Analysis (Alternate Format).
Bulk Data Entry Defines a user-defined cross-section based on a specific face of the model.
Bulk Data Entry Defines a partitioned superelement relocation by listing three noncolinear grids in the superelement and three corresponding grids not belonging to the superelement.
Bulk Data Entry Sensors may be used to activate loads.
Bulk Data Entry Defines a union of several SENSOR entries.
Bulk Data Entry Defines the generalized degrees-of-freedom of the superelement for use in One-Step Superelement Analysis.
Bulk Data Entry Defines the generalized degrees-of-freedom of the superelement for use in One-Step Superelement Analysis (Alternate Format).
Bulk Data Entry Defines the interior grid points for One-Step Superelement Analysis.
Bulk Data Entry Defines a set of grids, elements, design variables, MBD entities, mode numbers, frequencies or times for reference by other input definitions.
Bulk Data Entry Defines a list of structural grid points or element identification numbers.
Bulk Data Entry Defines a set of grids or elements.
Bulk Data Entry Defines the Superelement Tree for One-Step Superelement Analysis.
Bulk Data Entry Defines concentrated static loads on scalar, grid or fluid points.
Bulk Data Entry Defines the solver type to be used for static and dynamic analysis.
Bulk Data Entry This entry can be used to define single-point constraints and enforced displacements for structural Analysis.
Bulk Data Entry Defines sets of single-point constraints and thermal boundary conditions.
Bulk Data Entry Defines a single-point constraint set as a union of single-point constraint sets defined via SPC or SPC1 entries.
Bulk Data Entry This entry can be used to define enforced displacement value for Static Analysis.
Bulk Data Entry Defines the external function to be called to calculate time and temperature-dependent SPCD temperature values.
Bulk Data Entry Defines degrees-of-freedom to be excluded from AUTOSPC.
Bulk Data Entry Defines the flow pressure boundary conditions for Darcy Flow Analysis.
Bulk Data Entry Defines a surface spline for interpolating motion and forces for aeroelastic problems on aerodynamic geometries defined by regular arrays of aerodynamic points.
Bulk Data Entry Defines a beam spline for interpolating motion and/or forces for aeroelastic problems on aerodynamic geometries defined by regular arrays of aerodynamic points.
Bulk Data Entry Defines a curved surface spline for interpolating motion and forces for aeroelastic problems on aerodynamic geometries.
Bulk Data Entry Defines scalar points.
Bulk Data Entry Defines the stacking information and stacking sequence for ply-based composite definition.
Bulk Data Entry Defines the combination of frequency response and linear static subcases used for steady state analysis.
Bulk Data Entry Defines determinate reaction degrees-of-freedom in a free body.
Bulk Data Entry Defines a face of a shell or solid (3D solid, axisymmetric solid, or plane-strain solid) element as part of a surface.
Bulk Data Entry Defines values of parameters used during the CWELD and CSEAM connectivity search.
Bulk Data Entry Defines modal damping as a tabular function of natural frequency.
Bulk Data Entry Defines modal damping as a tabular function of mode index.
Bulk Data Entry Defines y values of each point on the loading time history.
Bulk Data Entry Defines a tabular function for use in generating frequency-dependent and time-dependent dynamic loads.
Bulk Data Entry Defines a tabular function for use in generating frequency-dependent and time-dependent dynamic loads. Also contains parametric data for use with the table.
Bulk Data Entry Defines the coefficients of a power series for use in generating frequency-dependent and time-dependent dynamic loads. Also contains parametric data for use with the table.
Bulk Data Entry Defines a general tabular function for use in supported reference entries.
Bulk Data Entry Defines a tabular function for use in generating temperature-dependent material properties.
Bulk Data Entry Defines a tabular function for use in generating temperature-dependent material properties. Also contains parametric data for use with the table.
Bulk Data Entry Defines coefficients of a power series for use in generating temperature-dependent material properties. Also contains parametric data for use with the table.
Bulk Data Entry Defines a multi-dimensional tabular function which identifies single or multiple X-values for a single Y-value.
Bulk Data Entry Defines a tabular function for material and friction property.
Bulk Data Entry Specifies the material property tables for elasto-plastic, temperature-dependent materials.
Bulk Data Entry Defines power spectral density as a tabular function of frequency for use in random analysis. Referenced on the RANDPS entry.
Bulk Data Entry Defines temperature at grid points or a SET of grid points for determination of thermal loading and stress recovery.
Bulk Data Entry Defines a temperature set as a union of temperature sets defined via the TEMP or TEMPD Bulk Data Entries.
Bulk Data Entry Defines a temperature value for all grid points of the structural model that have not been given a temperature on a TEMP entry.
Bulk Data Entry Defines temperature field for shell elements (as a combination of reference plane temperature and linear thermal gradient through thickness) for determination of thermal loading, temperature-dependent material properties and stress recovery.
Bulk Data Entry Defines parameters for mapping the grid temperature field from either an external file or an internal heat transfer subcase to either Nonlinear Static Analysis or Nonlinear Transient Analysis. The mapping is over time-domain only. The mapping is over time-domain only.
Bulk Data Entry Defines the time history output request for Nonlinear Explicit Analysis.
Bulk Data Entry Defines values for the initial conditions of variables used in Structural Transient Analysis and Explicit Analysis. Both displacement and velocity values may be specified at independent degrees-of-freedom.
Bulk Data Entry Defines the initial velocity on a set of grids along and about an axis.
Bulk Data Entry Defines a tied contact.
Bulk Data Entry Defines a time-dependent dynamic load or enforced motion.
Bulk Data Entry Defines a time-dependent dynamic excitation or enforced motion.
Bulk Data Entry Specifies the constraints for aeroelastic trim variables.
Bulk Data Entry Defines time step parameters for control and intervals at which a solution will be generated and output in transient analysis.
Bulk Data Entry Defines parameters for Nonlinear Direct Transient Analysis.
Bulk Data Entry Defines time step parameters for control and intervals at which a solution will be generated and output in explicit analysis.
Bulk Data Entry Defines the unbalanced rotating load during a rotor dynamic analysis in Modal Frequency Response, Linear Direct Transient or Small Displacement Nonlinear Direct Transient solution sequences. The unbalanced load is specified in a cylindrical system where the rotor rotation axis is the Z-axis.
Bulk Data Entry Defines a set of degrees-of-freedom.
Bulk Data Entry Defines parameters for nonlinear analysis involving time-dependent material behavior.
In order to prevent analyses from being carried out on badly discretized models, an element quality check is incorporated into the pre-processing phase.
In order to prevent analyses from being carried out on models with poor material definitions, a material property check is incorporated into the pre-processing phase. The material property check is controlled by the CHECKMAT parameter (see the PARAM input format).
The OptiStruct Example Guide is a collection of solved examples for various solution sequences and optimization types and provides you with examples of the real-world applications and capabilities of OptiStruct.
This manual presents solved verification models including NAFEMS problems.
This section provides quick responses to typical and frequently asked questions regarding OptiStruct.
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