2014•Advanced materials researchOpen access

Random Vibration Structure Fatigue Analysis Based on Finite Element Simulation

Long Tao Liu, Chuan Ri Li, Shuang Long Rong, You Gang Jin

Abstract

In order to analyze the fatigue of the airborne product structure, the modal analysis and random vibration analysis are conducted for the product by using the finite element analysis software ANSYS. The modal analyzing results are compared with the modal test results and the finite element model is corrected. The stress response power spectral density is obtained from random vibration analyzing. A frequency domain method for calculating the fatigue damage of the structure is presented. The simulation results are in agreement with the reliability enhancement testing results. An optimization scheme for the product structure design is given.

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Key concepts: Finite element method, Vibration fatigue, Random vibration, Structural engineering, Modal analysis, Modal, Spectral density, Vibration