Here,a multi-axial and multi-excitation test method was proposed,and an effective input method for virtual fatigue test of axle housing was provided.The finite element model of the axle housing was built,and its modal analysis and modal test were made.Their results agreed well with each other,the errors between first 5 order natural frequencies in modal analysis results and those in modal test were less than 5%,and the modal vibration shapes in both results were coincident.Then,using the modal synthesis method,the axle housing’s flexible body file was extracted.Using the finite element flexible body file replacement method,the axle housing’s multi-axial and multi-excitation rigid-flexible coupled virtual test system was developed,and the system was verified through simulation based on inputting simple harmonic signals and random signals.Based on a road’s simulated excitation spectrum,the axle housing’s virtual road simulation test was performed,and the multi-axial and multi-excitation virtual test system was used to conduct the test verification.The results showed that the simulated signals are in better agreement with the tested ones in amplitude and trend; the established multi-axial and multi-excitation virtual test system for axle housing has a higher correctness; the results provide an efficient and accurate means for the design verification and evaluation of axle housings.
Key words
axle housing /
multi-axial and multi-channel /
rigid-flexible coupling model /
virtual experiment /
road simulation
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