航空学报 > 2008, Vol. 29 Issue (3): 527-533

流体力学、飞行力学与发动机

基于改进的传声器阵列数据分析技术的飞机机体噪声实验研究

乔渭阳1,Ulf Michel2   

  1. 1.西北工业大学 动力与能源学院 2.德国宇航院柏林发动机声学研究分部
  • 收稿日期:2007-05-29 修回日期:2007-11-18 出版日期:2008-05-20 发布日期:2008-05-20
  • 通讯作者:

    乔渭阳1

Experimental Study of Airframe Noise with Improved Data Reduction Method of Microphone Array Measurements

Qiao Weiyang1,Ulf Michel2   

  1. 1.School of Engine and Energy, Northwestern Polytechnical University 2.Engine Acoustics Department, German Aerospace Center (DLR)
  • Received:2007-05-29 Revised:2007-11-18 Online:2008-05-20 Published:2008-05-20
  • Contact:

    Qiao Weiyang1

摘要:

发展了一种平面传声器阵列数据处理新方法——洁净信号处理算法,通过对传声器阵列混淆和旁瓣信号的有效抑制,改进了对声源的分辨。基于改进的数据分析方法,研究了真实飞机结构和真实飞行条件下飞机起落架、襟翼等声源的频谱特性、指向特性。研究结果表明,新的信号处理算法可以更加清晰地分离出飞机表面的气动噪声源。起落架噪声的频谱是由宽频随机噪声与一些较为明显的单音噪声源组成,在不同辐射角度时,起落架噪声的声级在不同频率范围有一定的差异。襟翼侧缘噪声频谱是一个包含有个别明显单音噪声的宽频噪声谱,襟翼内侧缘噪声谱和外侧缘噪声谱有明显的差异,在低频范围,襟翼侧缘噪声的指向性比较明显,但在高频范围,襟翼侧缘噪声没有明显的指向性。

关键词: 机体噪声, 平面传声器阵列, 噪声测量, 飞机噪声, 气动声学

Abstract:

An improved data reduction method, called as the Clean Algorithm, for the measurement of aircraft flying noise with the large planar microphone array is developed. In the Clean Algorithm, the simulation of response of a point source at the position of maximum sound emission in source map is firstly carried out. Then, this response is subtracted from the source distribution to reduce the aliases and side lobes.

Key words: airframe noise, microphone array, noise measurement, aircraft noise, aeroacoustics