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:

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.

Related Topics

Modal Analysis