Road noise, a factor of interior noise, generated by tire-suspension-body vibration, can be reduced by stiffness changes of rubber mounts installed in the suspension attachment points. However, generally, its stiffness properties are barely changed because of difficulty of compatibleness with riding comfort. Therefore, in this study, a mount stiffness optimization procedure is proposed that enables to not only reduce road noise but enhance riding comfort. For road noise reduction, it is important to grasp which component vibration on the system contributes mainly to the interior noise. So, the relationship between road noise and vibration of the suspension system is investigated by road noise contribution analysis based on the multiple inputs/single output (MISO) data analysis procedure. The inputs of the MISO system are the accelerations on various locations of the suspension system, and the output is the sound pressure at the driver's ear location. These data required for the analysis are measured by the in-operation test on an actual rough road. By this analysis, the contribution ranking of various components to the interior noise, and the best location and direction to evaluate the dynamic characteristics of the suspension system have been specified. Furthermore, the properties of rubber mounts which are highly sensitive to road noise and riding comfort respectively are specified by sensitivity analysis using frequency response functions. By this analytical method, it can be evaluated that the effects of the rubber mount's stiffness modification, and also can be considered the frequency dependence of its stiffness with relatively easy and accurate way.
Optimization procedure of rubber mounts for interior noise reduction of passenger car
Optimierung der Gummibefestigungen für die Innengeräuschreduzierung von Personenkraftwagen
2001
4 Seiten, 8 Bilder, 4 Quellen
Conference paper
English
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