This method can be used to obtain eigenvalues.
This algorithm is an excellent tool for the dynamic analysis of a structure, and when the dynamic behavior of a designed structure is known.
The basis reduction method involves solving the equation system of eigenvalue problems Kφ - λBφ = 0. This is the Ritz method and since it is not an iterative approach, precision is not verified. The tol parameter provided in the Modal Analysis Parameters dialog is ignored.
In this method it is required to define the master degrees of freedom (MDOF) which enable acquiring a reduced model. The method allows unneeded degrees of freedom to be excluded from the reduced model, leading to a significantly smaller system of equations.
Calculations
The calculations dialog for the Basis Reduction method shows the following phases:
See also: