Experiments Study on the Performance of Automotive Exhaust Muffler

Abstract

Firstly, a performance test system was established for exhaust muffler based on the existing engine bench and physical layout of vehicle exhaust system. Secondly, the experimental data of original muffler exhaust back-pressure, noise of exhaust and tailpipe were recorded, and the pressure loss and insertion loss were computed. An optimized design scheme was proposed and the verification experiment was conducted according to previous results and design requirements. Finally, the experimental results show that exhaust back-pressure is reduced at all engine speeds, especially at high speed (4800rpm or above) reduced by about 4kPa; and exhaust noise decreases obviously, the insertion loss reached 27 dB (A) at low speed (between 1000 and 3200rpm), the exhaust noise declined by about 3dB (A) at high speeds (4800rpm or above).