PBUSH1D

Bulk Data Entry Defines the linear and nonlinear properties for a one-dimensional spring-and-damper structural element.

Format

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
PBUSH1D PID K B M
SPRING TYPE IDT IDC IDTDU IDCDU
DAMPER TYPE IDT IDC IDTDV IDCDV
GENER   IDT IDC IDTDU IDCDU IDTDV IDCDV

Example 1

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
PBUSH1D 35 4.35 0.5

Example 2

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
PBUSH1D 35 4.35
SPRING TABLE 43

Definitions

Field Contents SI Unit Example
PID Property identification number.

No default (Integer > 0)

K Stiffness.

Default = 0.0 (Real > 0)

B Viscous damping.

Default = 0.0 (Real > 0)

M Total mass.

Default = 0.0 (Real > 0)

SPRING String indicating that a function defining the spring characteristics follows.
Tension
U > 0
Compression
U < 0

Where, U = U(GB) - U(GA) in CBUSH1D element coordinate system: GA/GB are grid points on CBUSH1D

DAMPER String specifying that the next 5 fields define a nonlinear viscous element in terms of a force versus velocity relationship.

(Character)

GENER String specifying that the next 7 fields define a general nonlinear elastic spring and viscous damper element in terms of a force versus displacement and velocity relationship.

(Character). For this element, the relationship can only be defined with TYPE=EQUAT

TYPE String indicating the type of definition.
EQUAT
The following fields are identification numbers of DEQATN entries.
TABLE
The following field is an identification number of a TABLEDi entry.

For GENER, TYPE = blank or EQUAT is allowed.

(Character)

IDT Identification number of a DEQATN entry for tension if TYPE=EQUAT.

Identification number of a TABLEDi entry for tension and compression if TYPE=TABLE.

No default (Integer > 0)

IDC Identification number of a DEQATN entry for compression if TYPE=EQUAT.

Is ignored for TYPE=TABLE.

Default = IDT (Integer)

IDTDU Identification number of a DEQATN entry for tension if TYPE=EQUAT.

The DEQATN entry defines the derivative of the force F with respect to the displacement, u for tension u > 0. For SPRING and GENER only, Required if TYPE=EQUAT.

No default (Integer)

IDCDU Identification number of a DEQATN entry for compression if TYPE=EQUAT.

The DEQATN entry defines the derivative of the force F with respect to the displacement u, for compression u < 0. For SPRING and GENER only.

Default = IDTDU (Integer)

IDTDV Identification number of a DEQATN entry for tension if TYPE=EQUAT.

The DEQATN entry defines the derivative of the force F with respect to the velocity v, for tension v > 0. For DAMPER and GENER only, Required if TYPE=EQUAT.

No default (Integer)

IDCDV Identification number of a DEQATN entry for compression if TYPE=EQUAT.

The DEQATN entry defines the derivative of the force F with respect to the velocity v, for compression v < 0. For DAMPER and GENER only.

Default = IDTDV (Integer)