Page 5: Accels

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  • accels panel
  • Figure 1 – Accels Interface

Purpose:

This interface is used to create accelerometers which in LS-DYNA are defined using the *ELEMENT_SEATBELT_ACCELEROMETER keyword card. An accelerometer is a tria element and all 3 nodes must be rigid. Rigid nodes are those belonging to a rigid body, a *CONSTRAINED_NODAL_RIGID_BODY, or extra nodes to a rigid body. Node1 of the accelerometer is defined in *DATABASE_HISTORY_NODE for outputting time histories to NODOUT and other binary time history databases. The accelerations are output in the accelerometer local coordinate system.

Controls:

  • rbs Show – Show existing *ELEMENT_SEATBELT_ACCELEROMETER entities
  • rb Modify – Modify existing *ELEMENT_SEATBELT_ACCELEROMETER entities
  • rb Create – Create new *ELEMENT_SEATBELT_ACCELEROMETER entities
  • rb Delete – Delete existing *ELEMENT_SEATBELT_ACCELEROMETER entities

For Show, Modify, and Delete, the Entity Operation Interface is displayed in the secondary controls area. For Create, the bottom panel is as shown in Figure 2 below.

  • Label: Set current entity label type

  • SBACID: Enter *ELEMENT_SEATBELT_ACCELEROMETER ID (unique number)
NewID

 Generate new ID

All

 Select all *ELEMENT_SEATBELT_ACCELEROMETER entities

None

 Deselect all *ELEMENT_SEATBELT_ACCELEROMETER entities

Rev

 Reverse selection *ELEMENT_SEATBELT_ACCELEROMETER entities

Alist

 Select all entities within the selected range

Apply

 Apply entries for creation/modification

Cancel

 Cancel this modification or selection

Done

 Exit accelerometer data interface

  • Click item from list to select (1)


Bottom Panel:

  • accels bottom
  • Figure 2 – Create Bottom Panel
  • rbs Three Node – Create accelerometer by three nodes
  • cbc NID1 – Pick node 1 or enter node 1 ID
  • cb NID2 – Pick node 2 or enter node 2 ID
  • cb NID3 – Pick node 3 or enter node 3 ID
  • rb Three Position – Create accelerometer by three position
  • X – Enter Origin Position X Value / X Direction / xy Plane X
  • Y – Enter Origin Position Y Value / Y Direction / xy Plane Y
  • Z – Enter Origin Position Z Value / Z Direction / xy Plane Z

Vector

 Call Direction Dialog

Modify

 Modify coordinates useing popup dialog

  • IGRAV: Set value for gravitational accelerations parameter (see Keyword manual)
  • INTOPT: Set value for integration option parameter (see Keyword manual)


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