波束形成技术可以通过非接触式的中远距离声压测量，得到机械设备噪声源位置分布及相对强度，但波束形成算法本身存在“旁瓣效应”引入的虚假声源干扰。因此，基于波叠加法提出对波束形成的改进算法，通过在波束形成定位出的噪声源位置处布置等效源，由声压匹配波叠加法和传声器阵列声压反算等效源强度，再由所得各等效源强度，根据波叠加法基本原理在重建面上进行声压重建，进而消除旁瓣效应。仿真与柴油机噪声源试验结果证明改进算法切实有效。
The location and intensity of the noise source can be figured out by beamforming through non-contact measurement, however, the results of beamforming were affected seriously by the side-lobe phenomenon, and the side-lobe indicate ghost source. So an improve algorithm to suppress the side-lobe phenomenon was proposed based on wave superposition method. Pre-localize the noise source by beamforming and set equivalent sources based on the pre-localize result. Figure out the intensity of equivalent source based on wave superposition method and micro-phone array sound pressure. Then re-construct sound pressure on the re-construction plane based on the equivalent source intensity and wave superposition method. The side-lobe was eliminate finally. Simulation and experiment results show that the improve algorithm can suppress the side-lobe phenomenon successfully.
2018,(): 8-12 收稿日期：2017-03-14
DOI：10.3404/j.issn.1672-7649.2018.02.002
分类号：TB532
基金项目：国家自然科学基金资助项目（51079118，51279148）
作者简介：卓瑞岩(1990-),男,硕士研究生,研究方向为噪声源定位
参考文献：
[1] 刘超. 基于麦克风阵列的声源定位算法研究[D]. 南京: 南京大学, 2015.
[2] 王雁, 刘志红, 吴波波, 等. 识别运动声源随机阵列生成法研究[J]. 声学学报, 2015(1): 97-103.
[3] BALLESTEROS J A, SARRADJ E, FERNÁNDEZ M D, et al. Noise source identification with Beamforming in the pass-by of a car[J]. Applied Acoustics, 2015, 93: 106-119.
[4] 李兵, 杨殿阁, 郑四发, 等. 基于遗传算法的动态优化波叠加噪声源识别方法[J]. 机械工程学报, 2010, 46(12): 99-105.
[5] KOOPMANN G H, SONG L, FAHNLINE J B. A method for computing acoustic fields based on the principle of wave superposition[J]. Journal of the Acoustical Society of America, 1989, 86(6): 2433-2438.
[6] GENG L, ZHANG X Z, BI C X. Reconstruction of transient vibration and sound radiation of an impacted plate using time domain plane wave superposition method[J]. Journal of Sound & Vibration, 2015, 344(3): 114-125.
[7] GOUNOT Y J R, MUSAFIR R E. Simulation of scattered fields: Some guidelines for the equivalent source method[J]. Journal of Sound and Vibration, 2011, 330(15): 3698-3709.
[8] 陈鸿洋, 商德江, 李琪, 等. 声场匹配波叠加法的水下结构声辐射预报[J]. 声学学报, 2013(2): 137-146.
[9] 吴绍维, 向阳, 李胜杨. 体积速度匹配分布源边界点法的特解源位置优化方法研究[J]. 声学学报, 2015(3): 381-390
[10] 张永斌. 基于等效源法和质点振速测量的近场声全息技术[D]. 合肥: 合肥工业大学, 2012.
