/SENSOR/RWALL

Block Format Keyword Describes the sensors used to activate or deactivate an object according to rigid wall force.

Format

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
/SENSOR/RWALL/sens_ID/unit_ID
sens_title
Tdelay                
rwall_ID DIR Fmin Fmax Tmin    

Defintion

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 ]
DIR Force direction.
= blank
Activation at first force
=FN
Normal Force
=FT
Tangent Force
=X
Force in X direction
=Y
Force in Y direction
=Z
Force in Z direction

(Integer)

 
Fmin Minimum force.

Default = 0 (Real)

[ N ]
Fmax Maximum force.

Default = 0 (Real)

[ N ]
Tmin Minimum time duration before activation when criteria is reached.

(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. For Sensor type RWALL:

    The sensor is activated one cycle after impact on the rigid wall.

    A sensor is used for one rigid wall. You can use several type RWALL sensors.

    clip0134
    Figure 1.
    Sensor is activated when contact on the rigid wall is detected, and the following force criteria is satisfied:
    • F R W A L L < F min MathType@MTEF@5@5@+= feaagKart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamOramaaBa aaleaacaWGsbGaam4vaiaadgeacaWGmbGaamitaaqabaGccqGH8aap caWGgbWaaSbaaSqaaiGac2gacaGGPbGaaiOBaaqabaaaaa@3FE0@ or F R W A L L > F max MathType@MTEF@5@5@+= feaagKart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamOramaaBa aaleaacaWGsbGaam4vaiaadgeacaWGmbGaamitaaqabaGccqGH+aGp caWGgbWaaSbaaSqaaiGac2gacaGGHbGaaiiEaaqabaaaaa@3FE6@ during Tmin
    Dir defines Force direction:
    FN
    Normal Force
    FT
    Tangent Force
    X
    Force in X direction
    Y
    Force in Y direction
    Z
    Force in Z direction

    Sensor is deactivated if the contact is lost

  4. Values for force and moment component limits in the force-based sensors (RWALL) can be positive and negative. Normal, tangent, total force and moment values are always positive.