摘要
微型复杂消声器的内部声场比较复杂,无法用平面波理论进行计算和预测,为了研究微型复杂消声器的消声特性,在合理假设进出口、内壁面边界条件的基础上,使用HYPERMESH建立消声的三维有限元模型,通过SYSNOISE计算传递损失。然后,通过改变结构参数(扩张室级数、内插管长度、隔板位置),且针对某一噪声优势频率添加共鸣腔。根据压缩机原始噪声频率特性,寻找其最优的消声结构组合,有效地提高了消声器的消声性能。最后对消声器进行声学模态分析,得出传递损失出现低谷,部分是由于消声腔内出现声共振。
The inner field of complicated structural muffler could not be predicted by plane wave theory. In order to analyze the acoustic characteristic of the muffler, it created finite model of the muffler by HYPERMESH, and calculated the transmission loss curve by SYSNOISE. Then, a number of effects were studied, including the number of expansions, the position of extended tube, the positions of rigid baffle in the chamber, and resonance cavity was added in the muffler. According to the original noise of the compressor, optimal combination was obtained, and the acoustic pe.rformance of muffler was improved efficiently. At last, through the analysis of the acoustic mode, the reason of wdleys in the transmission was acoustic resonance in the muffler.
出处
《机械设计与制造》
北大核心
2014年第4期140-142,共3页
Machinery Design & Manufacture
关键词
消声器
传递损失
有限元分析
性能优化
Muffler
Transmission Loss
Finite Analysis
Performance Optimization
