CBUSH1D

Bulk Data Entry

CBUSH1D – Rod-type Spring-Damper Element

Description

Defines a one-dimensional spring-damper structural element.

Format

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
CBUSH1D	EID	PID	GA	GB	CID

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
CBUSH1D	2	6	8	1

Field	Contents
EID	Unique element identification number. Must be unique with respect to all other element identification numbers. No default (Integer > 0)
PID	PBUSH1D entry property identification number. Default = EID (Integer > 0)
GA	Grid point identification number of the first connection point. No default (Integer > 0 or <PartName.number>) See comments 1 and 6.
GB	Grid point identification number of the second connection point. No default (Integer > 0 or <PartName.number>) See comments 1 and 6.
CID	Element coordinate system identification number. If a value of 0 is input, the basic coordinate system is selected. (Integer > 0 or blank) See comments 1 through 3.

Comments

1.	For non-coincident grids (GA ≠ GB), when no CID is specified, the line AB is the element axis. In geometric nonlinear analysis, the element axis (line GA to GB) follows the deformation of grids GA and GB.

2.	If GA and GB are coincident, or if GB is blank, CID must be specified. If GB is blank, the CBUSH1D element simulates a grounded bushing element.

If CID > 0, the x-axis of CID is the element axis. In geometric nonlinear analysis, depending on the referenced system being movable or fixed, the axis of the element will move or not move with the axes of the system, respectively. Geometric nonlinear analysis is selected by an ANALYSIS = EXPDYN subcase entry.

4.	In all linear subcases, as well as small displacement nonlinear quasi-static (ANALYSIS=NLSTAT) subcases, PBUSH1D and CBUSH1D are converted internally to the equivalent PBUSH (with PBUSHT, if necessary) and CBUSH.

5.	Rod-type spring-damper elements are ignored in heat transfer analysis.

Supported local entries in specific parts can be referenced by the use of “fully qualified references” on CBUSH1D entries in the model. A fully qualified reference (“PartName.number”) is similar to the format of a numeric reference. “PartName” is the name of the part that contains the referenced local entry (part names are defined on the BEGIN bulk data entry in the model). “number” is the identification number of a referenced local entry in the part “PartName”. See Parts and Instances in the User’s Guide for detailed information on the use of fully qualified references.

7.	This card is represented as a spring element in HyperMesh.