The following table provides guidelines for selecting the optimal analysis method to use for a brake-squeal problem:
| Analysis Method | Benefits | Costs |
|---|---|---|
| Linear non-prestressed modal |
Fast run time No convergence issues Good method for performing parametric studies |
Accuracy Does not include prestress effects |
| Partial nonlinear perturbed modal |
No convergence issues Includes prestress effects |
Accuracy |
| Full nonlinear perturbed modal |
Accurate Includes prestress effects |
Longer run time Convergence issues |
The following table provides guidelines for selecting the optimal eigensolver (MODOPT) for obtaining the brake-squeal solution:
| Eigensolver | Benefits | Costs |
|---|---|---|
| QRDAMP |
Fast run time An excellent solver for performing parametric studies |
Accuracy, as it approximates the unsymmetric stiffness matrix Not recommended when the number of elements contributing to unsymmetric stiffness matrix exceeds 10 percent of the total number of elements in the model |
| UNSYM |
Accuracy, as it uses the full unsymmetric stiffness matrix to solve the problem |
Long run time when many modes are extracted |
For further information, see Brake-Squeal (Prestressed Modal) Analysis in the Structural Analysis Guide.