Improved Method of Mixed-Boundary Component-Mode Representation for Structural Dynamic Analysis

摘要

An improved method of mixed-boundary component representation is presented. This residual flexibility mixed-boundary (RFMB) method presents two compelling features over the existing mixed-boundary methods. First, RFMB is accurate for the entire range of component boundary representations, that is, from all-fixed to mixed to all-free boundaries; therefore, resorting to other methods to cover the all-fixed- or all-free-boundary cases is not necessary. Second, all parameters for the RFMB generalized stiffness matrix can be directly derived from component test, resulting in a more rigorous definition of test/analysis correlation. Two example problems are presented, demonstrating the benefits of the subject method. This new RFMB method has been implemented in the latest release of the general purpose finite element program, MSC.Nastran, as the default.