【摘要】 针对近场声全息(near-field acoustic holography, 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 source method, NAH-ESM)基础上,利用Newton插值和克希荷夫积分的声压重构方法提出一种双层插值NAH噪声源定位方法。由少量麦克风测量点数据,重构多个全息面上任意位置点的声压值及声矢量,实现噪声源定位,进而重构噪声源。最后结合噪声源重构结果建立噪声源等效模型,通过实地测量,建立某制氧厂主厂房噪声数值仿真,仿真结果与实测值误差在5%以内。通过实验证明在一定复杂环境下,该方法能有效提高噪声源定位效率及精度。更多还原

【Abstract】 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.更多还原