| 基于传递函数估计的近场声全息的噪声源识别 |
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| 引用本文： | 周东旺,李舜酩,江星星,王勇,程春.基于传递函数估计的近场声全息的噪声源识别[J].仪器仪表学报,2015,36(12):2874-2880. |
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| 作者姓名： | 周东旺 李舜酩 江星星 王勇 程春 |
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| 作者单位： | 南京航空航天大学能源与动力学院 |
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| 基金项目： | 中央高校基本科研基金(NZ2015103)、机械结构强度与振动国家重点实验室开放课题(SV2015-KF-01)项目资助 |
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| 摘 要： | 在近场声全息(NAH)声场测量中,噪声的存在使近场声全息重建精度降低,影响声场重建的实现。本文提出一种基于传递函数估计的双测量面NAH技术,首先采用双测量面对噪声源信号进行测量,然后基于传递函数法引入一种合理的传递函数估计,结合参考传声器信号来求解全息面复声压,最后利用前后测量面数据相位差异来求解格林函数,根据声场重建公式进行近场声全息声场重建。数值仿真及重建误差分析表明,存在测量噪声影响的情况下,本文提出的方法相比传递函数法NAH重建误差更小,能够更准确地识别声源位置并提高声全息重建精度。最后对某型拖拉机前端进行近场阵列扫描试验,验证基于传递函数估计的双测量面NAH的有效性。
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| 关 键 词： | 近场声全息 声场重建 双测量面 传递函数估计 重建精度 |
Noise source identification of near-field acoustical holography based on transfer function estimation |
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| Zhou Dongwang,Li Shunming,Jiang Xingxing,Wang Yong,Cheng Chun.Noise source identification of near-field acoustical holography based on transfer function estimation[J].Chinese Journal of Scientific Instrument,2015,36(12):2874-2880. |
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| Authors: | Zhou Dongwang Li Shunming Jiang Xingxing Wang Yong Cheng Chun |
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| Affiliation: | College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics |
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| Abstract: | In near-field acoustical holography (NAH) sound field measurement, noise signal reduces the sound field reconstruction precision which affects the realization of the sound field reconstruction. A double measurement plane NAH technology based on transfer function estimation method is presented. Firstly, the sound source signal is obtained by using double measurement planes. Then, a rational transfer function estimation (TFE) is introduced, combining with the reference microphone signal, to solve the complex sound pressure of holographic plane. Lastly, the Green''s function is calculated by the phase difference between front and rear measurement planes, so the sound field is reconstructed according to the acoustic field reconstruction formula. Simulation analysis and reconstruction error comparison show that the error induced by the measurement noise is reduced,and this method could better identify the sound source location and improve the acoustical holography reconstruction accuracy. Finally, near-field array scanning is carried out for the front of a tractor, and the double measurement plane NAH based on TFE is used to identify the main radiation source to verify the effectiveness of the proposed method. |
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