# /SENSOR/ACCE

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

## Format

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
/SENSOR/ACCE/sens_ID/unit_ID
sens_title
Tdelay
Nacc
If Nacc > 0: Define Nacc Accelerometer Reference per line:
(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
accel_ID Dir Γmin Tmin

## Definition

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)

Tdelay Time delay.

(Real)

$\left[\text{s}\right]$
Nacc Number of accelerometers (Nacc ≤ 6).

(Integer)

accel_ID Accelerometer identifier.

(Integer)

Dir Direction. 4

(Text)

Γmin Minimum absolute value of acceleration.

(Real)

$\left[\frac{\text{m}}{{\text{s}}^{2}}\right]$
Tmin Minimum time duration before activation when criteria is reached. 3

(Real)

$\left[\text{s}\right]$

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

Tsensor = Tdelay + Tmin

with, Tmin (time when the criteria is reached).

4. Dir defines the acceleration direction:
X
X direction
Y
Y direction
Z
Z direction
XY
XY plane $\left(\sqrt{{\gamma }_{x}^{2}+{\gamma }_{y}^{2}}\right)$
YZ
YZ plane $\left(\sqrt{{\gamma }_{y}^{2}+{\gamma }_{z}^{2}}\right)$
ZX
ZX plane $\left(\sqrt{{\gamma }_{z}^{2}+{\gamma }_{x}^{2}}\right)$
XYZ
total acceleration $\left(\sqrt{{\gamma }_{x}^{2}+{\gamma }_{y}^{2}+}{\gamma }_{z}^{2}\right)$