Add a Spring Foundation subnode to specify a spring or damper connecting the rigid connector to a fixed ground. The spring can act at an arbitrary position in space. A translational spring implicitly contributes also to the moment if it is not applied at the center of rotation of the rigid connector. The data that you specify is interpreted in the selected coordinate system.
Select an option from the list: Center of rotation or
User defined. This is the location where the spring is attached.
Select the Offset check box to add an optional offset vector to the definition of the location. Enter values for the offset vector
Xoffset.
When Spring constant is selected, the translational spring matrix can be entered as
Isotropic,
Diagonal,
Symmetric, or
Full. For
Isotropic the same spring constant is used in all the diagonal elements of the spring matrix.
When Force as function of extension is selected, enter the force vector
Fs. It must be a function of the built-in variables describing the spring extension. The default value indicates the correct variable name, for example,
solid.rig1.uspring1_spf1.
When Spring constant is selected, the rotational spring matrix can be entered as
Isotropic,
Diagonal,
Symmetric, or
Full. For
Isotropic the same spring constant is used in all the diagonal elements of the spring matrix.
When Moment as function of rotation is selected, enter the moment vector
Ms. It must be a function of the built-in variables describing the spring extension. The default value indicates the correct variable name, for example,
solid.rig1.thspring1_spf1.
All settings in the Rotational Loss Factor Damping section are analogous to the corresponding settings in the
Loss Factor section. In 2D, only one scalar loss factor, corresponding to rotation around the out-of-plane axis, is given.
Select Isotropic,
Diagonal,
Symmetric, or
Full, then enter values or expressions for the damping constants
du in the table. If you select
Isotropic, the effect is the same as when you select
Diagonal and enter the same value for all diagonal elements.
All settings in the Viscous Rotational Damping section are analogous to the corresponding settings in the
Viscous Damping section. In 2D, only one scalar viscous damping, corresponding to rotation around the out-of-plane axis, is given.
Physics tab with Rigid Connector node selected in the model tree: