文章摘要
孙爽,乔渭阳,黄晓聃.数控传声器阵列反卷积法对飞机噪音的应用与实验研究[J].,2012,31(4):294-302
数控传声器阵列反卷积法对飞机噪音的应用与实验研究
A study of the experiment and the application to the plane with inverse method of numerical control microphone array
投稿时间:2008-11-26  
中文摘要:
      本文主要讨论传声器阵列反卷积法对于飞机发动机噪音测量的实际应用及反卷积法对于飞机过顶测噪的数值模拟。传统“波束成型法”的成像是点源与点分布函数卷积的结果,只有在满足瑞利限制的前提下可以分辨多个相距较近的声源。本文介绍了一种简称反卷积法的传声器阵列新方法,它是将原有的Beamforming结果作为已知条件,从中提取有用的声源信息,去除掉旁瓣的干扰,使得处理出来的声源幅值与位置更加准确。观察运动声源会产生多普勒效应,特别是在频域中处理声信号时会使发声源产生频率偏移,因此在反卷积法使用前引入平均多普勒频移因子,它使得运用反卷积法在频域中预测飞机进场噪音成为可能。
英文摘要:
      The present paper considers the application to aero-engine with inverse method of microphone array and the numerical simulation to plane over head with microphone array. The traditional Beamforming result comes from a convolution between the sources and the associated point spread functions. The nice result can be obained when the distance between the sources reaches the Rayleigh criterion. A new method, inverse method, is developed in this paper. Inverse method makes Beamforming as pre-processing and extracts useful information from it, meanwhile, amputates the distortion from side-lobes, gets a more exact result. When the source is moving, the observer gets a result distorted by the Doppler effect. This effect distorts the frequency of the source , especial with the frequency method. The resolution is to introduce the average Doppler frequency shift factor. This achieves the processing of inverse method for the noise of landing plane in the frequency domain.
DOI:10.11684/j.issn.1000-310X.2012.04.010
中文关键词: 波束成型法,反卷积法,传声器阵列,噪声测量,多普勒频移
英文关键词: Beamforming, Inverse method, Microphone array, Noise measurement, Doppler frequency shift
基金项目:
作者单位
孙爽 中国科学院工程热物理研究所 北京 100190
 
乔渭阳 西北工业大学动力与能源学院 西安 710072
 
黄晓聃 中国商用飞机责任有限公司 上海 200120 
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