Microflown based monopole sound sources for reciprocal measurements

Abstract

Monopole sound sources (i.e. omni directional sound sources with a known volume velocity) are essential for reciprocal measurements used in vehicle interior panel noise contribution analysis. Until recently, these monopole sound sources use a sound pressure transducer sensor as a reference sensor. A novel monopole sound source principle is demonstrated that uses a Microflown (acoustic particle velocity) sensor as a reference sensor. As compared to a sound source that uses a sound pressure transducer as a reference sensor, the new sound sources demonstrated are relatively easy to calibrate, not sensitive to changes in ambient temperatures, and suitable to use in all sorts of acoustic environments. © 2008 SAE International.