Convergence Quantity for Modal and Prestress Modal Analyses

If you select Multi-Pass Adaptive for the convergence method, you can select the quantities Creo Simulate uses to calculate convergence. See Percent Convergence for information on how Creo Simulate measures convergence for the multi-pass adaptive method.

For modal and prestress modal analyses, you can select one of these options:

• Frequency—Calculates the convergence for the frequency of each mode.

• Frequency, Local Displacement and Local Strain Energy—Calculates convergence of the frequency of each mode, of the displacements along each element edge, and of the total strain energy of each element.

Use this option if you are interested in details of mode shapes. However, Creo Simulate is likely to have to go to a higher polynomial order to reach convergence for this option, and takes longer to compute results

• Frequency, Local Displacement, Local Strain Energy and RMS Stress—Uses RMS (Root Mean Square) stress in addition to frequency, displacement, and strain energy to calculate convergence.

The RMS stress error measure is a single scalar value that is proportional to the square root of the estimated error in total strain energy.

Creo Simulate checks convergence for RMS stress by extrapolating the total strain energy for three successive calculations. As a result, RMS stress is sensitive to the rate of convergence.

Use this option if you are interested in details of mode shapes and modal stresses. This option provides high accuracy, but can also mean greater computation time.

Return to Convergence Options for Structural Analyses.