Surface Radiated Noise of Exhaust Systems, CAE Method and MeasurementTechniques

Authors

J.-F. Brand, D. Wiemeler, Dr. P. Garcia, Tenneco, Heinrich Gillet GmbH, Edenkoben; Prof. Dr. U. Bernhard, Adam Opel GmbH, Rüsselsheim

Year

2007

Print Info

Fortschritt-Berichte VDI, Reihe 12, Nr. 639

Summary

As an integral part of the vehicle, exhaust systems influence the acoustical comfort both inside and outside the cabin. Additionally, law requirements, such as pass-by noise, have to be fulfilled. Although the tailpipe noise is the main source, noise radiation over metallic surfaces is also a serious issue. The components are excited by gas exchange cycles and also by vibrations from the engine and its aggregates. The rear part of the exhaust system, the so-called cold end, is decoupled from vibrations by flexible elements. The hot end, however, that means the front part including the converter up to the flexible element, is dominantly excited by vibration.

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