Recent evolutions in terms of regulations for pass-by noise force Automotive OEM’s to build more silent cars than before. To be able to decrease the emitted noise level while meeting other constraints such as weight, space or sound quality, the OEM’s and their suppliers have to come up with innovative solutions to reduce the different noise sources and control the noise propagation around the vehicle. In particular, powertrain and tire noise sources are dominant contributors to the exterior sound emitted by vehicles and efficient methods to understand, analyze and reduce their contribution need to be developed. Exterior acoustic simulations are required to find optimum acoustic treatment location and physical properties while offering the possibility to improve and predict final pass-by noise performance before the first complete vehicle prototype is built.
This paper presents a framework for the efficient simulation, including parametric analysis, of wheel arch acoustic treatments. A finite element scheme is used to solve the acoustic propagation of different sources around a car tire while a locally-reacting admittance boundary condition is used to model the wheel arch acoustic treatment.
The parametric analysis focuses on the investigations of acoustic treatment materials, location and geometries, on the tire contribution to the total pass-by noise level. A model reduction strategy based on a condensation of the car surface and exterior acoustic problem on the tire and wheel arch surface is presented as a mean to a drastic speed-up of the computational process, therefore opening the door to a parametric analysis process.
Comparisons between the different designs as well as the computational performance of the proposed approach are presented. Numerical simulations are conducted with the Actran commercial acoustic simulation framework.
Parametric Analysis of an Automotive Wheel Arch Acoustic Treatment
Proceedings
2020-01-24
15 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Deutsch
A WHEEL ARCH AND WHEEL ARCH ASSEMBLY, AND A STRUCTURAL WHEEL ARCH
Europäisches Patentamt | 2021
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