文章摘要
季建朝,王明新,周永清.闭口风洞声学测量中的阵列设计[J].声学技术,2018,37(2):99~104
闭口风洞声学测量中的阵列设计
Array design for acoustic measurement in closed wind tunnel
投稿时间:2017-05-31  修订日期:2017-07-23
DOI:10.16300/j.cnki.1000-3630.2018.02.001
中文关键词: 声传感器阵列  波束形成  气动噪声测量
英文关键词: sensor array  beamforming  aerodynamic noise measurement
基金项目:国家自然科学基金资助项目(11402305)
作者单位E-mail
季建朝 清华大学航天航空学院, 北京 100084
陆军航空兵学院, 北京 101123 
jianchao_ji@163.com 
王明新 陆军航空兵学院, 北京 101123  
周永清 陆军航空兵学院, 北京 101123  
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中文摘要:
      为了在已经建好的闭口风洞中进行基于声传感器阵列的声学测量,且获得最佳成像结果,需要按照壁面预留开口进行阵列的最优化设计,针对常见声源及风洞壁面已有开口提出了不同口径相配合、椭圆形和“窗口”型三种阵列布局方法,基本满足了各种壁面开口的需求,解决了规则形阵列设计与风洞预留开口不匹配、阵列性能无法达到最佳、甚至阵列无法使用等问题。通过特殊阵列设计以及成像结果对比,得出了影响波束形成的一般因素及阵列优劣的判定方法,仿真和实验结果表明,所提出的设计方法普适性强,而且波束形成结果具有较高的分辨率,能够有效抑制旁瓣,提高动态范围。
英文摘要:
      In a closed wind tunnel for acoustic measurement,the layout of acoustic sensors needs to be optimized according to the existed openings on the wall for the best image results.For common sound sources and existed openings on the wall of the wind tunnel,three kinds of array layout methods are proposed in this paper,they are different aperture matching,ellipse and ‘windows’ types.The mentioned methods not only meet the existing opening needs,but also solve some thorny problems,as regular array design does not match the wind tunnel openings,array performance cannot reach optimum,and even sensor array cannot work.Through the special array shape design and imaging results comparison,the general factors affecting beamforming results and quality judgements of the array are obtained.The simulation results show that the proposed methods have strong adaptability and the beamforming results have high resolution,which can effectively suppress side lobes and improve dynamic range.
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