F. De Coninck, Multi-axial road reproductions for non-linear road noise models, 2007

Abstract

This dissertation considers the use of multi-axial road reproduction experiments for the investigation and quantification of non-linearities in vehicle structureborne road noise due to operational loading. Conventional road noise testing is limited in terms of excitation degrees of freedom or frequency range. In this dissertation a high-frequency multi-axial shaker table is enhanced and used for multi-axial road reproduction experiments in the frequency range up to 300 Hz. Required hardware and software improvements have been developed, implemented and validated through simulation and experiment. An extensive measurement campaign has been performed to quantify the vehicle operational loading and investigate the influence of road surface, speed and preload. Frequency response based experimental models for the tyre filtering behaviour and suspension structure-borne road noise transmission have been acquired on the shaker table for different operational conditions related to preload and road surface properties. Finally an elaborate set of guidelines is reported for future investigations to increase the reproduction accuracy, drastically reduce test and data processing time and extend the frequency range up to 500 Hz.

Order Code

Code: 07D3