동적 소음저감 기법을 적용한 차량용 소음기가 엔진 성능에 미치는 영향에 대한 연구

The purpose of this study is on the development of a muffler system which controls the noise and static pressure drop of the exhaust gas of an automobile engine with the concept of the dynamic control method. The control the noise and pressure resistance of the muffler system, the muffler system is designed with two rotating impellers installed in the muffler cavity. Compared to a conventional muffler that has baffles and connecting pipes in the muffler chamber, new concept of the muffler system named Dyna-muffler, has two rotating impellers installed into the muffler chamber separated into two cavities. Each rotor has 6 blades and it acts as a moving baffle absorbing kinetic and pressure energy of the high-pressure, high-speed exhaust gas from the engine. From the experiments, it was found that the pressure resistance of the Dyna-muffler is quite similar to the conventional static muffler in the normal engine operating range. To understand the performance of the Dyna-muffler on the engine efficiency and output power, the engine dynamometer experiments will be conducted.