基于波叠加的噪声源识别方法

将波叠加方法引入了噪声源识别领域,结合基于传声器阵列的测量技术和可视化的结果表示方法,提出了一种新的噪声源识别方法,并通过仿真和实验验证了该方法的正确性.根据波叠加方法的原理,声源产生的空间声场可以用其内部的一系列虚源点来等效代替,而虚源源强可以通过匹配场点的声压来获得,进而由这些虚源重构任意场点的各种声学量.声压可通过阵列测量技术获得,计算结果可显示成等高线图、矢量图或动画,便于直观地判别出声源的位置、大小、传播路径.仿真和实验都取得了良好的分辨效果,表明该方法可对任意形状物体进行噪声源识别.

A Noise Source Identification Technique Based on Wave Superposition Method

An efficient technique on NSI(Noise source identification) field based on the WSM(Wave superposition method) was proposed.The WSM,accompanied with microphone-array measurement technique and visualization of the results,provides a wonderful resolution in NSI field.According to the theory of the WSM,the total acoustic field radiated by an arbitrary-shaped noise radiator can be substituted by a serial of virtual source points.These point sources locate on a surface interior to the body of a radiator,and their strengths can be evaluated in terms of a pressure measurement on another surface.Once calculated,the strengths of these point sources allow the pressure(and intensity,instantaneous point velocity,etc.) distribution exterior to the radiator to be calculated.The pressure is measured with an microphone array,and the final results are visualized in terms of pressure contours and instantaneous point velocity animations,etc.With these visualized maps and animations,the main noise sources can be easily located and quantified,also the noise transmission path can be found.Through simulations and experiments,the validity and efficiency of this technique were tested.