STC-GV增压机隔声罩通风消声器声学性能仿真研究
吴群1,2，吕岩1,2，李耀祖3，谭龙龙3，仪垂杰*,2,3
（1.青岛理工大学 机械与汽车工程学院，山东 青岛 266525；2.青岛理工大学 工业流体节能与污染控制教育部重点实验室，山东 青岛 266525；3.青岛大学 机电工程学院，山东 青岛 266000）
摘要：为解决某制氧厂增压机组隔声罩通风问题，需要在隔声罩壁上开孔并安装通风消声器。首先利用NOR848声阵列成像仪识别了主噪声源为二级压缩机，继而采用近场声压测量对增压机二级压缩机进行了详细的噪声测试与频谱分析，并结合噪声源特性与降噪要求设计了一款三层串联式微穿孔板消声器。依据三维有限元理论和管道声模态理论初步确定了消声器结构参数，创建其声学模型，并利用有限元法分别分析膨胀腔长度、隔板数量、隔板位置等参数对传递损失的影响，并综合以上几种因素确定消声器最终结构。最后经有限元仿真求出消声器传递损失曲线，分析发现其在高频消声量达到要求，符合最初的降噪要求。
关键词：增压机；消声器；微穿孔板；有限元法；传递损失
中图分类号：TB53；TK413；TH45 文献标志码：A doi：10.3969/j.issn. 1006-0316.2021.06.002
文章编号：1006-0316 (2021) 06-0008-07
Simulation Study on Acoustic Performance of Ventilation Muffler of STC-GV Supercharger
WU Qun1,2，LYU Yan1,2，LI Yaozu3，TAN Longlong3，YI Chuijie2,3
( 1.School of Mechanical and Automotive Engineering, Qingdao University of Technology, Qingdao 266520, China; 2.Key Laboratory of Energy Conservation and Pollution Control of Industrial Fluids of Ministry of Education, Qingdao University of Technology, Qingdao 266520, China; 3.College of Mechanical and Electrical Engineering, Qingdao University, Qingdao 266000, China )
Abstract：In order to improve the sound enclosure ventilation of a supercharger unit in an oxygen plant, this paper proposed a method of opening a hole in the wall of the sound enclosure and installing a ventilation muffler. First, the main noise source was identified as the secondary compressor by the NOR848 sound array imager. Then, the noise measurement and spectrum analysis of the secondary compressor were carried out in detail by the near field sound pressure measurement. Combining the characteristics of noise source and the requirements of noise reduction, a three-layer series micro-perforated muffler was designed. According to the three-dimensional finite element theory and the pipeline acoustic mode theory, the structural parameters of the muffler were determined and the acoustic model of the muffler was established. Parameters causing transmission loss, such as the length of the expansion cavity, the number of baffles and the position of baffles, was analyzed respectively by using the finite element method. Finally, the structure of the muffler was determined. Finally, the transfer loss curve of the muffler is obtained by finite element simulation, and the analysis shows that the muffler meets the requirements of the high frequency noise reduction and meets the initial noise reduction requirements.
Key words：supercharger；muffler；micro-perforated plate；finite element method；transmission loss
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收稿日期：2020-10-14
基金项目：国家自然科学基金项目——多源运动声场特征提取和空间稀疏化方法及测量关键技术研究（61671262）
作者简介：吴群（1993－），男，湖北黄冈人，硕士研究生，主要研究方向为噪声与振动控制，E-mail：754065693@qq.com。*通信作者：仪垂杰（1958－），男，山东高密人，博士，教授，主要研究方向为噪声与振动控制、声信号处理，E-mail：chuijieyi@vip.163.com。
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