双层插值NAH噪声源定位方法研究

针对近场声全息(near-fieldacousticholography,NAH)在实际测量环境下降低环境噪声的影响且保证全息面上声压重建精度的需求,基于空间面积分声压重建理论,在基于等效源法的近场声全息方法(near-field acoustic holography based on equivalent sour...

Research on noise source location method based on double-layer interpolated NAH

In the actual measurement environment, NAH results are greatly affected by environmental noise and the accuracy of sound pressure reconstruction on the holographic surface is limited. In order to solve these problems, based on the spatial area partial sound pressure reconstruction theory, combined with NAH-ESM, a two-layer interpolation NAH noise source location method is proposed by using Newton interpolation and Kirchhoff integral’s sound pressure reconstruction method. Point data measured by a small number of microphones to reconstruct the sound pressure value and sound vector at any point on multiple holographic surfaces. The method realized the noise source location, and then reconstructed the noise source. Finally, the noise source equivalent model is established based on the results of the noise source reconstruction, and the field measurement is combined to calculate the noise distribution of the main building of an oxygen plant. The error between the simulation result and the measured value is within 5%. Experiments show that this method can effectively improve the efficiency and accuracy of noise source location in a certain complex environment.