基于传递函数估计的近场声全息的噪声源识别

发布时间：2018-06-24 23:13

本文选题：近场声全息 + 声场重建　；参考：《仪器仪表学报》2015年12期

【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。
[Abstract]:In the measurement of near-field acoustic holography (NAH), the existence of noise reduces the accuracy of near-field acoustic holography reconstruction and affects the realization of acoustic field reconstruction. In this paper, a new NAH technique based on the estimation of transfer function is proposed. Firstly, the noise source signal is measured by the dual measurement face, and then a reasonable estimation of the transfer function is introduced based on the transfer function method. The complex sound pressure of holographic plane is solved by using the reference microphone signal. Finally, the Green's function is solved by using the phase difference of the measured plane data before and after, and the near field acoustic field reconstruction is carried out according to the sound field reconstruction formula. Numerical simulation and reconstruction error analysis show that under the influence of measurement noise, the reconstruction error of the proposed method is smaller than that of the transfer function method (NAH), which can identify the position of sound source more accurately and improve the accuracy of acoustic holographic reconstruction. Finally, a near field array scan test on the front end of a tractor is carried out to verify the effectiveness of the dual measurement plane NAH based on the transfer function estimation.
【作者单位】：南京航空航天大学能源与动力学院;
【基金】：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
【分类号】：TN911.4

【参考文献】