Rod Type Spring and Damper Connection
Description: Defines the connectivity of a one-dimensional spring and viscous damper element.
Format:
Example:
| Field | Definition | Type | Default |
|---|---|---|---|
| EID | Element identification number. | Integer > 0 | Required |
| PID | Property identification number of a PBUSH1D entry. | Integer > 0 | Required |
| GA, GB | Grid point identification number of connection points. | Integer > 0 | See Remark 4 |
| CID | Element coordinate system identification. | Integer ≥ 0 or blank |
Remarks:
- Element identification numbers must be unique with respect to all other element identification numbers.
- For noncoincident grids GA ≠ GB and if CID is blank, the line GA to GB is the element axis. In nonlinear analysis with large displacement effects turned on, the element axis follows the deformation of grids GA and GB (see Figure 1).
- If CID ≥ 0 is specified, the x-axis of the CID coordinate system is the element axis. In nonlinear analysis with large displacement effects turned on, the element axis remains fixed.
- A blank in field 5 may be used to indicate a grounded terminal GB. A grounded terminal is a point whose displacement is constrained to zero.
- If GA and GB are coincident or if GB is blank, then CID ≥ 0 must be specified and the element axis is the x-axis of CID.
Figure 1. Spring and Damper Element