Vehicle Acoustic Synthesis Method: Improving Acquisition Time by Using P-U Probes

Abstract

<div class="htmlview paragraph">In order to reach OEMs acoustic treatment targets (improving performance while minimizing the weight and cost impact), we have developed an original hybrid approach called “Vehicle Acoustic synthesis method”[<span class="xref">1</span>] to simulate - and therefore to optimize - noise treatments for both insulation and absorption, and to calculate the resulting Sound Pressure Level (SPL) at ear points for the middle and high frequency range.</div> <div class="htmlview paragraph">To calculate the SPL, we identify equivalent volume velocity sources from intensity measurements, and combine them to acoustic transfer functions (panel/ear) measured or computed with ray tracing codes using the reciprocity principle.</div> <div class="htmlview paragraph">Compared to our first approach [<span class="xref">1</span>], this paper shows a new measurement technique using pressure-particle velocity probes [<span class="xref">2</span>]. This technique allows to reduce acquisition time by a factor four, and makes therefore possible a synthesis method on a complete car within two weeks.</div>