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.
采用二次发泡工艺制备出一种声学性能优良的聚氨酯多层复合泡沫吸声材料，并对其吸声性能进行了研究分析。
This research provided a new technique that two procedure foaming technique to produce composite Polyurethane foam, and made a research on its sound absorption property.
通过算例分析和总结三种方法预测消声器声学性能的优缺点。
The advantages and shortcomings of the three methods for the prediction of silencer acoustic attenuation performance are discussed.
在声学方面改进了传递损失的计算方法，着重分析了穿孔结构参数对消声器声学性能影响。
In acoustics aspect, the paper improves the method of calculating transmission loss and analyses emphatically the influence of structure parameters of perforated structure to acoustic performance.
并对含有穿孔管声学元件的消声器进行传递损失计算和消声性能分析。
Their transmission losses are calculated, and their silencing of noise properties analyzed.
并对含有穿孔管声学元件的消声器进行传递损失计算和消声性能分析。
Their transmission losses are calculated, and their silencing of noise properties analyzed.
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