FREQUENCY DOMAIN STRUCTURAL ANALYSIS OF PRODUCT HAVING FREQUENCY-DEPENDENT MATERIAL PROPERTY

摘要

PROBLEM TO BE SOLVED: To provide a system and a method for performing frequency-domain structural analysis of a product made of at least in-part frequency-dependent material.SOLUTION: An FEA (Finite Element Analysis) model representing a product made of at least in-part frequency-dependent material and subjected to external harmonic excitations in a range of external excitation frequencies is received in a computer system. The range of frequencies is partitioned into N frequency bands based on predefined criteria. In each frequency band, a representative frequency is selected for calculating material properties and an eigensolution frequency range is determined for establishing upper and lower limits of subsequent eigensolution. N eigensolutions are performed to extract natural vibration frequencies and associated mode shapes of the product. Depending upon which one of the N frequency bands each of the external harmonic excitations is located in, a corresponding set of extracted natural vibration frequencies and mode shapes is selected and used in a modified mode-superposition technique to obtain steady-state dynamic (SSD) responses of the product.