Scientific Article

Power-based application of frequency-averaged 𝓁₁-norm regularisation technique for the synthesis of accelerating indoor tyre pass-by noise

¹ Institute of Sound and Vibration Research, University of Southampton, Southampton SO17 1BJ, United Kingdom
² Siemens Digital Industries Software, 3001 Leuven, Belgium
³ Department of Mechanical Engineering, KU Leuven, Celestijnenlaan 300 B, 3001 Leuven, Belgium

^* Corresponding author: thanasispapaioan@gmail.com

Received: 10 May 2021
Accepted: 23 October 2021

Abstract

Pass-by noise contribution analysis is an engineering procedure employed to estimate the contributions from various noise sources on a vehicle to the overall sound pressure level. This can be realised by placing a set of microphones close to the various sources to estimate their source strengths and then synthesising the response at a far-field linear array in the presence of the remaining sources. The results described in this paper rely on measured near-field pressure data close to the tyres of an electric vehicle under accelerating conditions. The number and position of the estimated virtual source strengths used is a compromise between complexity and accuracy, which has previously been addressed mostly empirically. A power-based, frequency-averaged 𝓁₁-norm regularisation technique is investigated to optimise the equivalent source position and strength for one operating tyre and, subsequently, the far-field pass-by noise pressure estimates. It is shown that for the tyre under investigation, optimising the positions of only two equivalent sources over the frequency range of interest gives a good representation of the measured far-field spectra.