基于矢量传声器的扫描测量噪声可视化系统

Noise Visualization System for Scanning Measurement Based on Acoustic Vector Sensor

矢量传声器具有与频率无关的“8”字指向性,非常适合如舱室等狭小、复杂且具有声学混响的环境中的噪声扫描测量。本文通过分析一维矢量传声器的组合指向性特性,研究基于矢量传声器组合指向性扫描测量的声场可视化的原理,进一步结合音视频采集研制了基于矢量传声器的扫描测量噪声可视化系统,并利用该系统开展了车辆舱室中模拟双声源扫描测试。结果表明,基于矢量传声器组合指向性的扫描测量可以实现声场可视化,开发的噪声可视化系统可在舱室内完成声场可视化及噪声源识别,具有实用性,进一步推动了矢量传声器的发展与应用。

Acoustic vector sensor has a frequency-independent figure-of-eight directivity, which is suitable for noise scanning measurement in small and complex spaces with acoustic reverberation, e.g. cabins. In this paper, by analyzing the directivity characteristics of one-dimensional acoustic vector sensor, the principle of sound field visualization based on the directivity scanning measurement is studied. And a noise scanning measurement visualization system based on the acoustic vector sensor is developed by combining audio and video acquisition. Simultaneously, the noise measurement experiment for dual-source is arranged and conducted in vehicle cabin. The results show that that the scanning measurement based on the directivity of acoustic vector sensor can complete the visualization of sound field. And the visualization of the sound field and the identification of the noise source can be realized by the developed system. It is practical and further promotes the development and application of acoustic vector sensor.