Exploring the properties of acoustic particle velocity sensors for near-field noise source localisation applications

Abstract

One of the main challenges arising from noise and vibration problems is how to identify the areas of a device, machine or structure that produce significant acoustic excitation, i.e. the localisation of main noise sources. Many tools can provide an accurate answer if the geometry is known and the testing process is undertaken in a controlled environment such as an anechoic chamber. Nevertheless, conventional pressure-based source localisation techniques often require a more elaborate, and ultimately more expensive, system to study complex scenarios, without necessarily guaranteeing accurate results. In contrast, the direct visualisation of normal acoustic particle velocity is a robust approach to locating sound sources regardless of frequency range or the reverberation of the measurement environment. This paper introduces the main characteristics of acoustic particle velocity sensors for source localisation purposes. In addition, some practical examples of acoustic mapping are given, demonstrating the theoretical principles introduced.

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