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Glossary
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Modal Time History Analysis - Advanced Options

The Advanced tab in the Modal Time History dialog box sets the numerical integration method and its parameters.

Newmark The uncoupled equations of motion are solved with the Newmark time-stepping method.

For a linear variation of acceleration between time-steps, select:

  • First integration parameter a =0.5
  • Second integration parameter beta = 1/6

For a constant acceleration between time-steps, select:

  • a = 0.5 and beta =0.25.
Wilson-Theta The Wilson-Theta method of integration is used to solve the uncoupled equations of motion.

Theta. The value of theta controls the numerical stability

For theta = 1, the solution formulation is similar to the Newmark's linear acceleration method.

For theta greater or equal to 1.37, the Wilson's method is unconditionally stable.



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