Direct acoustic vector field mapping: new scanning tools for measuring 3D sound intensity in 3D space
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. Measurement methods relying on sound intensity are widely used for the localization and quantification of noise sources although they are often limited by the measurement environment. In contrast, the use of a microphone in combination with three orthogonal particle velocity sensors enables the direct acquisition of 3D dimensional sound intensity without the traditional frequency constrains of pressure-based solutions. Furthermore, stationary sound fields can be characterized efficiently by means of manual scanning techniques. In this paper, a expanded scanning method is used in combination with a 3D tracking system based on a stereo camera. Acoustic variations throughout space can be then determined by combining the signals acquired with the tracking information of the probe. An overview of the measurement methodology is given along with the evaluation of several practical examples.
Fernandez Comesana, D., Steltenpool, S., Korbasiewicz, M. and Tijs, E., 2015. Direct acoustic vector field mapping: new scanning tools for measuring 3D sound intensity in 3D space. In Proceedings of Euronoise.