Inverse Sub-Structuring Method for Multi-Coordinate Coupled Product Transport System

摘要

A new high-accuracy transfer function is selected, and an inverse sub-structuring method is developed for the analysis of the dynamic characteristics of a three-sub-structure coupled product transport system. The closed-form analytical solution to inverse sub-structuring analysis of multi-coordinate coupled multi-sub-structure product transport system is derived. The proposed method is validated by a lumped mass spring damper model; the predicted frequency response functions (FRFs) of sub-structures and the coupling stiffness, in addition to the most concerned system-level FRF, are compared with the direct computations, showing exact agreement. Then, FRF tests of a physical prototype of the multi-coordinate coupled product transport system with three sub-structures are performed to further check the accuracy of the suggested method. The method developed offers an approach to predict the unknown sub-structure-level FRFs and coupling stiffness purely from system-level FRFs. The suggested method may help obtain the main controlling factors and contributions from the various structure-borne paths for the product transport system, which may certainly facilitate the cushioning packaging design.