General Spring Supports

Enter general spring support with 6x6  coupled matrix for stiffness, damping and mass, which includes the components related to other degrees-of-freedom with respect to GCS or node's local coordinate system for selected nodes. Replace or delete previously defined general spring support.

Define the general spring support matrix first to enter the general spring supports.

From the Main Menu select Boundary > Spring Supports > General Spring > General Spring Supports.

Click to the right of General Spring Supports: Display the General Spring Support Table.

 Boundary Group Name

Select a Boundary Group in which the specified boundary condition is included. Select "Default" if Group assignment is unnecessary. Click to the right to prompt the "Define Boundary Group" dialog box to add, modify or delete Boundary Groups.

Options

Add/Replace: Enter or replace new general nodal spring stiffness of selected nodes

Delete: Delete previously entered general nodal spring stiffness of selected nodes

General Spring

General Spring Type
Select general nodal spring type to be entered from the previously defined general spring support.(Refer to "Define General Spring Type")

Click to the right to display the General Spring Type dialog box.

Stiffness

SDx: Spring stiffness in GCS x-direction (or node's local x-direction when defined)

SDy: Spring stiffness in GCS y-direction (or node's local y-direction when defined)

SDz: Spring stiffness in GCS z-direction (or node's local z-direction when defined)

SRx: Rotational spring stiffness about GCS x-axis (or node's local x-axis when defined)

SRy: Rotational spring stiffness about GCS y-axis (or node's local y-axis when defined)

SRz: Rotational spring stiffness about GCS z-axis (or node's local z-axis when defined)

Note
The above 6 spring stiffness values represent only the 6 diagonal terms in the 6 x 6 stiffness matrix entered in General Spring Type.

Mass: When the mass matrix is defined in Define General Spring Type, "Considered" is displayed. When there is no mass matrix defined, "None" is displayed.

Damping: When the damping matrix is defined in Define General Spring Type, "Considered" is displayed. When there is no damping matrix defined, "None" is displayed.