/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)

 [ s ]
Nacc Number of accelerometers (Nacc ≤ 6).

(Integer)
accel_ID Accelerometer identifier.

(Integer)
Dir Direction. 4

(Text)
Γmin Minimum absolute value of acceleration.

(Real)

 [ m s 2 ]
Tmin Minimum time duration before activation when criteria is reached. 3

(Real)

 [ s ]

Comments

  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 ( γ x 2 + γ y 2 )
    YZ
    YZ plane ( γ y 2 + γ z 2 )
    ZX
    ZX plane ( γ z 2 + γ x 2 )
    XYZ
    total acceleration ( γ x 2 + γ y 2 + γ z 2 )