3 Day Open Conference

Microflown based in flight acoustic testing methods for helicopter cabin interior sound field analysis
Wednesday 19th November 2008
11.00 - 11.20
Auditorium 1

The Microflown two hot wires sensor has made acoustic particle velocity measurable quantity just as sound pressure. Close to a vibrating surface, acoustic particle velocity is also a good approximation of the normal structural velocity. A range of novel testing methods to solve cabin interior noise problems will be discussed. Socalled PU based sound intensity measurements are not susceptible to reflections as they occur in a cabin, and thus measurements can be done without the need to create anechoic conditions. Array applications include portable arrays for acoustic hot spot finding, distributed arrays for panel noise contribution analysis and the visualisation of 3 D sound intensity streamlines. Single probe applications include the in situ measurement of the acoustic absorption of materials on curved materials with high spatial resolution and the scan & listen method to make modes audible. First results of recent in flight helicopter cabin tests will be presented.

About the Speaker(s):

Dr Oliver Wolff
Acoustic Consultant
Microflown Technologies, The Netherlands

Oliver Wolff (1967) studied physics in Heidelberg/Germany and obtained his PhD magna cum laude in 1998. Since then, as an acoustic consultant, he worked for various blue chip companies like Collins & Aikman, Head Acoustics and Rieter Automotive. In these positions, he discovered the merits of Microflown based testing techniques.Since the 1 st March 2008, he is responsible for the global on site testing activities of Microflown Technologies for the automotive and aerospace industry.