Arnoldi/Lanczos Eigen Method

In addition to the standard supbspace iteration method for eigen solution, the Advanced Math Solver can use the Arnoldi/Lanczos method. For large scale eigen value problems, the Arnoldi method is very efficient.

Load Dependent Ritz Vectors

Ritz vector analysis can be used for dynamically loaded structures to more efficiently evaluate the relevant modes. It can require significantly less computational effort to evaluate a large structure when compared to natural free-vibration methods.

Autoshfiting of Eigen Vectors

For subspace iteration and the Arnoldi/Lanczos methods, an autoshift option can be used to reduce memory demand for large structures.

Refer to G.17.3.1 Solution of the Eigenproblem for details.