基于边界元的微型轿车进气消声器消声性能分析计算（本科毕业论文设计）.doc

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ABSTRACT

With the development of vehicle noise control technology, engine intake noise control has become the emphasis. This paper has briefly introduced the situation of intake silencer Research and Application, expounded the intake noise engendering cause and the basic theory, and studied the principle of the resonant silencer.
Based on the BEM, the 3D models of the mufflers are calculated by using SYSNOISE software, the impact and trends of the Structural parameters and the fillet of resonator to the resonant frequency are analyzed, and the effects of the tail pipe and the installation location of muffler on the performances are also analyzed. Then design and improve the muffler based on this analysis, with satisfying the design request.
The results of the analysis show that the Structural parameters and the fillet of resonator have a little influence to the resonance frequency. With the height or the cross sectional area increasing, the resonant frequency moves to the low-frequency, for a fixed resonator, there is greater fillet, greater effect on the resonant frequency, so in the actual production and processing performances, it should make the fillet smaller. The results also show that the installation location of muffler has very great effect on the performances when Considers the effects of the tail, and the muffler should be installed far from the exit of the road for getting a better performance. At the same time, it shows that the resonant frequency will not interfere with each other when there two resonators are linked. These results provide a basis for the design of the muffler


Key words£º Intake silencer, resonator, BEM, tail pipe effect, transmission loss


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