PBUSHT

Bulk Data Entry

PBUSHT – Generalized Spring and Damper Property

Description

Defines property values for a generalized spring and damper structural element.

Format

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
PBUSHT	PID	TYPE	TID1	TID2	TID3	TID4	TID5	TID6
		TYPE	TID1	TID2	TID3	TID4	TID5	TID6
		TYPE	TID1	TID2	TID3	TID4	TID5	TID6
		TYPE	TID1	TID2	TID3	TID4	TID5	TID6
		...	...

Field	Contents
PID	Property identification number. Must match with a PID of a PBUSH Bulk Data Entry. No default (Integer > 0)
TYPE	Identifies what the following six fields referenced. Can be defined in any order, but may only appear once per PBUSH definition. If K, the following six fields are stiffness vs. frequency table references for dofs 1 through 6, respectively. If B, the following six fields are viscous damping vs. frequency table references for dofs 1 through 6, respectively. If GE, the following six fields are structural damping vs. frequency table references for dofs 1 through 6, respectively. If M, the following six fields are directional mass vs. frequency table references for dofs 1 through 6, respectively. If KN, the following six fields are force vs. deflection table references for dofs 1 through 6, respectively. Or, If KSCALE, the following six fields are stiffness scale factors vs. frequency table references for dofs 1 through 6, respectively. If BSCALE, the following six fields are viscous damping scale factors vs. frequency table references for dofs 1 through 6, respectively. If GESCALE, the following six fields are structural damping scale factors vs. frequency table references for dofs 1 through 6, respectively. If MSCALE, the following six fields are directional mass scale factors vs. frequency table references for dofs 1 through 6, respectively. See comment 3. No default (K, B, GE, M, or KN)
TID#	A TABLED# entry identification number. The type of the referenced table is defined by the TYPE keyword given on the same line. The six references on each line represent the 6 degrees-of-freedom in sequence from 1 through 6. Default = 0 (Integer > 0)

Field

Contents

PID

Property identification number. Must match with a PID of a PBUSH Bulk Data Entry.

No default (Integer > 0)

TYPE

Identifies what the following six fields referenced. Can be defined in any order, but may only appear once per PBUSH definition.

If K, the following six fields are stiffness vs. frequency table references for dofs 1 through 6, respectively.

If B, the following six fields are viscous damping vs. frequency table references for dofs 1 through 6, respectively.

If GE, the following six fields are structural damping vs. frequency table references for dofs 1 through 6, respectively.

If M, the following six fields are directional mass vs. frequency table references for dofs 1 through 6, respectively.

If KN, the following six fields are force vs. deflection table references for dofs 1 through 6, respectively.

Or,

If KSCALE, the following six fields are stiffness scale factors vs. frequency table references for dofs 1 through 6, respectively.

If BSCALE, the following six fields are viscous damping scale factors vs. frequency table references for dofs 1 through 6, respectively.

If GESCALE, the following six fields are structural damping scale factors vs. frequency table references for dofs 1 through 6, respectively.

If MSCALE, the following six fields are directional mass scale factors vs. frequency table references for dofs 1 through 6, respectively.

See comment 3.

No default (K, B, GE, M, or KN)

TID#

A TABLED# entry identification number. The type of the referenced table is defined by the TYPE keyword given on the same line. The six references on each line represent the 6 degrees-of-freedom in sequence from 1 through 6.

Default = 0 (Integer > 0)

Comments

1.	The K, B, GE, and M fields are associated with the same entries on the PBUSH entry.

2.	PBUSHT may only be referenced by CBUSH elements in the residual structure which do not attach to any omitted degrees-of-freedom.

TYPE=K/KSCALE, B/BSCALE, GE/GESCALE and M/MSCALE are allowed for frequency response analysis only, while TYPE=KN is allowed only for nonlinear analysis. In Modal Frequency Response Analysis, the frequency-dependency is only used in the frequency response part of the solution, not in the modal analysis part of the solution.

For TYPE=KN, Tension is U > 0 and Compression is U < 0 where U = U(GB) – U(GA) in CBUSH element coordinate system: GA/GB are grid points on CBUSH.

For backward compatibility with Nastran, if ONLY the dof1 field for the GE line (line where TYPE=GE) is specified on ALL PBUSHT entries and the other dofs for the GE line are blank on ALL PBUSH entries, then a single structural damping table for each PBUSHT applied to all defined dofs on the K line for each PBUSH is assumed. If ANY PBUSHT entry has a dof field other than dof1 for the GE line specified, then the GE fields are considered variable on ALL PBUSH and PBUSHT entries.

5.	This card is represented as a property in HyperMesh.