METHOD FOR PREDICTING COUPLING-LOSS FACTOR OF COMPLEX STRUCTURE

摘要

The present invention provides a method for predicting a coupling-loss factor of a complex structure; a system is cut into continuously coupled subsystems, and the boundary conditions of a subsystem on a coupling edge are approximated; a finite element model of each coupled subsystem is established; boundary conditions are imposed, and a modal analysis of a structural finite element model is performed; modal data are extracted; the work of modal interaction is calculated by using the stress modal mode and displacement modal mode of the coupled edges of two subsystems, and the coupling loss factor of the structure is predicted by using a dual modal equation method. The present invention combines a finite element method and a dual modal equation method to predict the coupling loss factor of the complex structure; a finite element method is used to obtain the displacement and stress modal modes at the coupling edges, and the natural frequencies and modal quality of the subsystems; by means of calculating the interaction work of the coupling subsystems and then combining with a dual modal equation method, the coupling-loss factor is obtained, and the coupling-loss factor of a complex structure can be accurately and highly effectively predicted.