Command Element

Description

Modifies a bushing force element.

Format

<Force_Bushing

    id                  = "integer"

    i_marker_id         = "integer"

    j_marker_id         = "integer"

    kx                  = "real"

    ky                  = "real"

    kz                  = "real"

    ktx                 = "real"

    kty                 = "real"

    ktz                 = "real"

    cx                  = "real"

    cy                  = "real"

    cz                  = "real"

    ctx                 = "real"

    cty                 = "real"

    ctz                 = "real"

    preload_x           = "real"

    preload_y           = "real"

    preload_z           = "real"

    preload_tx          = "real"

    preload_ty          = "real"

    preload_tz          = "real"

/>

Attributes

id

Element identification number (integer>0).  This number is unique among all Force_Bushing elements and uniquely identifies the element.

i_marker_id

Specifies the Reference_Marker at which the force is applied.  This is designated as the point of application of the force.

j_marker_id

Specifies the Reference_Marker at which the reaction force and moment are applied.  This is designated as the point of reaction of the force.

kx
ky
kz
 
ktx
kty
ktz

These define the diagonal entries for a 6x6 stiffness matrix that is used to calculate the spring force for Force_Bushing. All stiffness values must be non-negative, in other words, Kij > 0.

cx
cy
cz
 
ctx
cty
ctz

These define the diagonal entries for a 6x6 damping matrix that is used to calculate the damping force for Force_Bushing. All damping values must be non-negative, in other words, Cij > 0.

preload_x
preload_y
preload_z

preload_tx
preload_ty
preload_tz

These define the pre-loads in the Force_Bushing element.  In other words, the forces at I when there is deformation.  The force and torque components are measured in the J coordinate system.  The first three components define the pre-load force while the last three are pre-load torques.  The data is optional.  Their default values are 0.

Example

<Force_Bushing

    id         = "207006"

    kx         = "6000."

    cx         = "6."

    preload_x  = "0."

    ky         = "6000."

    cy         = "6."

    preload_y  = "0."

    kz         = "1000."

    cz         = "1."

    preload_z  = "0."

    ktx        = "500000."

    ctx        = "500."

    preload_tx = "0."

    kty        = "500000."

    cty        = "500."

    preload_ty = "0."

    ktz        = "100000."

    ctz        = "100."

    preload_tz = "0."

/>

Command Element

Description

Modifies a BUSHING force element.

Declaration

def BUSHING(id, LABEL="", I=0, J=0, C=[], CT=[], K=[], KT=[], FORCE=[], TORQUE=[]):

Attributes

id

Element identification number (integer>0).  This number is unique among all the BUSHING elements and uniquely identifies the element.

LABEL

The name of the BUSHING element.

I

Specifies the ID of the marker at which the force and moment are applied. This is designated as the point of application of the force.

J

Specifies the ID of the marker at which the reaction force and moment are applied.  This is designated as the point of reaction of the force.

C

Modifies the three translational damping coefficients for BUSHING.  All damping coefficient values must be non-negative.

CT

Modifies the three rotational damping coefficients for BUSHING.  All damping coefficient values must be non-negative.

K

Modifies the three translational stiffness values for BUSHING.  All stiffness values must be non-negative.

KT

Modifies the three rotational stiffness values for BUSHING.  All stiffness values must be non-negative.

FORCE

Modifies the three translational preload forces for BUSHING, measured in the J coordinate system.  The data is optional.  Their default values are 0.

TORQUE

Modifies the three rotational preload torques for BUSHING, measured in the J coordinate system.  The data is optional.  Their default values are 0.

Comments

See Force_Bushing

Example

The example below shows how a BUSHING may be modified.

BUSHING(207006, C=[60,60,60], K=[6000,6000,1000], FORCE=[33,44,55], CT=[100,100,100], KT=[500000,500000,100000], TORQUE=[0,0,0])