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发动机进气消声器研究
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摘要
随着汽车噪声控制技术的发展,进气噪声已成为汽车噪声控制的重点。但是目前国内对进气消声的研究还不系统,因此对进气噪声的产生机理及控制技术的研究已经成为一个亟待解决的问题。
    本文介绍了进气消声器研究与应用的现状与发展,阐述了进气噪声产生机理及控制的基本理论,研究了Helmholtz共振型进气消声器的原理,立足于Helmholtz共振型进气消声器的共振频率的准确确定,建立了两类四种共振腔模型,并讨论了它们之间的相互推演关系。同时,利用Matlab软件编程计算了四种模型的理论共振频率,从理论上分析了共振腔腔体的尺寸、形状对共振频率的影响及其趋势。在此基础上设计并加工了两类七个共振型进气消声器,研制了发动机进排气消声器性能测试实验台,开发了发动机进排气消声器声学性能测试软件,并在该实验台上测试了所设计的进气消声器静态工况下的传声损失,从实验的角度研究了共振腔的尺寸、形状对其共振频率的影响及其趋势。并针对SC7080A进气噪声的频率特性,设计了三腔并联旁支型进气消声器,使SC7080A车外加速噪声得到有效控制。
    研究及应用结果表明,共振腔的结构参数对其共振频率有影响,不同尺寸的腔体要用不同的模型来计算。一维轴向传播理论能够准确预测共振腔的共振频率,从而为正确设计出针对发动机进气噪声频率特性的Helmholtz共振型进气消声器提供依据,达到有效控制发动机进气噪声的目的。
With the development of vehicle noise control technology, engine intake noise con-
    trol has become the emphasis. As the research on the subject at home is not clear and systemic, it is important to solve the problem.
    This paper has presented the situation of intake silencer research and application and expounded the intake noise engendering cause and the basic theory on controlling the intake noise. Then a research established in the accurate determination of resonance frequencies of different kind of Helmholtz resonators is done. According to different assumptions, four kind of mathematical models are established, and the relations between them are discussed. At the same time, the resonant frequencies of four kinds of resonator are calculated by the programs which are made with Matlab software. The effect of resonator geometrical parameters on resonant frequency is theoretically analyzed. In order to carry out the acoustic and aerodynamics performances tests, seven resonators are designed and made, and a specialized engine intake silencer and exhaust silencers test bench was designed. The tests and analysis are performed as well. On the basis of the intake noise spectrum of SC7080A, a three-parallel-connected resonant silencer is designed, and that has efficiently controlled the acceleration noise of SC7080A.
    The research and the application shows that the resonator geometrical parameter has effect on its resonant frequency, and the One dimension(1-D) model can predict the frequency accurately. Therefore, if an engine intake noise spectrum is known, one can design a Helmholtz resonant silencer to control the intake noise.
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