상용차 배기계에서 액티브 머플러를 이용하 배기 소음 제어

In this study, active muffler was designed and was manufactured for exhaust noise reduction of commercial vehicle, then experiment of real vehicle was conducted. In a manufactured active mufbecause the flow of exhaust noise in tail pipe outlet are become a plane wave, the global reof radiation noise from outlet and the placement of error microphone to avoid the exhaust gas of high temperature could be implemented. In control algorithm, reduction of noise of engine driving frequency and harmonic frequency can be archieved using the proposed reference signal including a fixed speed state(2,OOOrpm, 3,OOOrpm. 4,OOOrpm) and a run-up speed state(2,OOOrpm -4,OOOrpm) is accomplished with the active muffler installed in vehicle.