The Sound-solid Coupled Vibration And Lightweight Of The Micro-axle Vehicle

In recent years, along with the rapid development of the society also got rapiddevelopment of automobile industry, automobile vibration and noise and comfort hasbeen the issues of common concern to automotive engineering. Traditional method isby increasing the thickness of the structure can prevent the spread of sound waves to acertain extent, the thickness of the structure increase will increase the weight of thestructure, but at the same time energy shortage and environmental pollution, noisepollution and so on have become contradiction growing, traditional methods cannotmeet the needs of the development of modern automobile industry.From the point of view of acoustic systems, structural noise from the structurevibration, sound waves must use and the structure of the adjacent medium, so theanalysis of the structure noise root lies in the analysis of the structure and mediuminfluence each other in the acoustic wave propagation is sound-solid couplingvibration characteristics. By studying the coupling system of sound pressuredistribution optimization structure to realize lightweight structure.This topic to a minicar output based on the original data to optimize design ofthe rear axle bridge shell, this type bridge shell for steel plate welding bridge shell.Through professional CAD3D modeling software UG accurate modeling of the rearaxle and learn from mechanical structure optimization theory and finite elementmethod, the CAD technology, CAE technology into the rear axle housing and internalmedia bridge cavity acoustic-solid coupling systems and lightweight axle housingstudy. First analysis of the designed bridge shell in four kinds of typical workingconditions of stress and strain of intrinsic mode and free condition. Secondly throughthe simulation analysis of gas inside the shell and the coupled vibration of bridge shellontology, to study the acoustic-solid coupling system under different externalharmonic excitation frequency sound pressure distribution of the bridge shell as abasis for the rear axle shell structure optimization, at the same time establish a rearaxle bridge shell with bridge coupled mathematical model of the air cavity. For therealization of ultimate bridge shell acoustic structure optimization and bridge shelllightweight provide certain theoretical basis and simulation.