/SENSOR/ACCE

Block Format Keyword Describes the sensors used to activate or deactivate an object according to accelerometer.

Format

If N_acc > 0: Define N_acc Accelerometer Reference per line:

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
`accel_ID`	`Dir`	Γ_min		`T`_min

Field	Contents	SI Unit Example
`sens_ID`	Sensor identifier. (Integer, maximum 10 digits)
`unit_ID`	Optional unit identifier. (Integer, maximum 10 digits)
`sens_title`	Sensor title. (Character, maximum 100 characters)
`T`_delay	Time delay. (Real)	$[s]$
`N`_acc	Number of accelerometers (`N`_acc ≤ 6). (Integer)
`accel_ID`	Accelerometer identifier. (Integer)
`Dir`	Direction. 4 (Text)
Γ_min	Minimum absolute value of acceleration. (Real)	$[\frac{m}{s^{2}}]$
`T`_min	Minimum time duration before activation when criteria is reached. 3 (Real)	$[s]$

Sensors can be used to activate airbags, imposed forces, pressures, and fixed velocities.
Sensors can be used to activate or deactivate these elements: brick, quad, shell, truss, beam, spring or 3N Shell with /ACTIV.
Sensor is activated (at T_sensor) if one of the accelerometers gives an acceleration greater than Γ_min during a time greater than T_min:
T_sensor = T_delay + T_min

with, T_min (time when the criteria is reached).
Dir defines the acceleration direction:

X

X direction

Y

Y direction

Z

Z direction

XY

XY plane $(\sqrt{γ_{x}^{2} + γ_{y}^{2}})$

YZ

YZ plane $(\sqrt{γ_{y}^{2} + γ_{z}^{2}})$

ZX

ZX plane $(\sqrt{γ_{z}^{2} + γ_{x}^{2}})$

XYZ

total acceleration $(\sqrt{γ_{x}^{2} + γ_{y}^{2} +} γ_{z}^{2})$