本文应用声学仿真的方法对125-C型摩托车变速箱端盖进行结构优化设计，达到降低表面辐射噪声的目的。
In this paper, the acoustic simulation was applied to improve the noise performance of gearbox cover on the motorcycle of 125-C with the low vibro-acoustic structure design.
本文的研究是在传统的叶轮优化设计过程中添加声学性能分析的一个环节。
This thesis adds a link of acoustic performance analysis in the traditional process of impeller optimization.
此外，还指出在设计流量下优化的叶轮不一定在非设计工况下也有良好的声学性能。
In addition, it is shown that impellers optimized at design point may not have good acoustic performances at off design point.
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