Defining Modal Dynamic Steps

You can define a modal dynamic step to receive the response of the model as a function of time based on a given time-dependent loading.

See Also
About Modal Dynamic Steps
  1. From the Procedures section of the action bar, click Modal Dynamic Step .
  2. Optional: Enter a descriptive Name.
  3. Enter the Step time to specify the total time of the step.
  4. Enter the value for the Time increment size.
  5. Expand Damping.
  6. Select Use structural material and element damping to use the structural damping matrix that includes material and/or element damping properties.

    This option is subject to licensing restrictions and is not available in all scenario apps (depending on the product or process licenses purchased).

    The simulation creates the structural damping matrix using the s factor representing material structural damping as well as the s e l factor representing the structural damping coefficient for elements such as springs with complex stiffnesses and connectors.
  7. Select Use viscous material and element damping to use the viscous damping matrix that includes material and/or element damping properties.

    This option is subject to licensing restrictions and is not available in all scenario apps (depending on the product or process licenses purchased).

    The simulation creates the viscous damping matrix by using material damping properties and/or damping elements (such as dashpot or mass elements). The viscous, mass, and/or stiffness proportional damping matrix includes the material Rayleigh damping factors ( α R m a t and β R m a t ), as well as the element-oriented damping factor (for example, for mass elements).
  8. To select the eigenmodes to be used for this step, see Selecting Eigenmodes for Mode-Based Procedures.
  9. Click OK.