结合模态声学贡献量与板面声学贡献量的减速箱降噪技术研究

摘要

A quick and exact method for finding the effective rib arrangement regions was proposed.Firstly the radiated noise of gearbox with a double helical gear system was calculated using FEM/BEM.Then panels were divided based on the analysis of acoustic transfer vector and modal acoustic contribution.Panel acoustic contribution analysis was completed and regions having larger acoustic contributions were found.Finally,the structure of gearbox housing was improved and the effective rib arrangement regions were identified.The results showed that the analysis of acoustic transfer vector and modal acoustic contribution can provide basis for the definition of panels and make it more accurate.The regions having larger acoustic contributions can be found quickly and exactly,which can provide basis for the finding of effective rib arrangement regions.The radiated noise on the corresponding field point can be reduced by arranging ribs on these effective regions.%提出了一种能够快速准确地确定肋板有效添加区域的方法。首先以单级人字齿轮减速器箱体为研究对象，采用 FEM／BEM方法计算了箱体的辐射噪声。接着在分析了声传递向量和模态声学贡献量的基础上划分了板面并进行了板面声学贡献量分析，确定出了声学贡献量较大的区域。最后对箱体进行了结构改进确定出了肋板的有效添加区域。结果表明声传递向量和模态声学贡献量的分析结果可以为板面划分提供依据，使得板面划分更有针对性，从而可以快速准确地确定出声学贡献量较大的区域，为有效添加区域的确定提供基础，在有效添加区域上添加肋板可以明显降低对应场点上的辐射噪声。