Direct acoustic vector field mapping: new scanning tools for measuring 3D sound intensity in 3D space
Invited paper
Microflown Technologies
Tuesday 2 june, 2015, 09:00 - 09:20
0.8 Rome (118)
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. Measurement methods relying on sound intensity are widely
used for the localisation 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.