Layout of engine exhaust system for low-noise idling condition

초록

Discharge noise of the exhasut system is the major cause of the idle noise. In this study, for the minimization of the low frequency noise, we attempted to optimize the layout of the exhaust systems by changing the positions of silencers and the lengths of inlet and outlet pipes in each silencer. When the design variables were the positions of two silenceres as a simple test example, three typical layouts for the exhaust system were designed including an optimal one. By comparing the predicted and measured results, it was found that the optimized exhaust layout has a higher noise reduction than the ohter layout designs.