Application of two-chamber muffler to reduce car noise in engine intake system

Abstract

There is obvious noise while a vehicle accelerating, under the engine speed at 2410 rpm and 3,650 rpm. Based on tests it is found that noise is induced by engine intake system. In order to reduce the noise level a Helmholtz resonance muffler is introduced, which is widely used in engine intake system. Generally, several resonance mufflers are needed to reduce the same number of noise peaks. This way is not good for cost control and space arrangement. In this paper, the theory of Helmholtz resonance muffler with two chambers is applied and transmission loss analysis is done to determine the chambers' sizes to reduce the noise level effectively. A sample of intake system is made based on the simulation results, and validation tests are conducted to confirm the improvement in car noise reduction. © Springer-Verlag 2013.