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전달경로의 차이를 이용한 새로운 차량용 능동 머플러의 개발

New Active Muffler System Utilizing Destructive Interference by Difference of Transmission Paths

  • 황요하 (한국과학기술연구원 트라이볼로지 연구센터) ;
  • 이종민 (한국과학기술연구원 트라이볼로지 연구센) ;
  • 김승종 (한국과학기술연구원 트라이볼로지 연구센터)
  • 발행 : 2002.05.01

초록

A new active muffler system has been developed and its superior performance on both noise reduction and engine torque increase is demonstrated with experiment. Main characteristic of the proposed muffler system is the use of destructive interference by transmission path difference of divided exhaust pipes to reduce major exhaust noise components thereby overcoming problems of other active exhaust noise control methods. The exhaust pipe is divided into two sections and joined again downstream. One divided pipe has a sliding mechanism to vary its length, which is controlled to make half wavelength transmission path difference for the major engine rpm frequency. In this system one divided pipe is used to control major rpm frequency and its Harmonics and another pipe is used to control noise component double the frequency of rpm. An after-market tuning muffler, which has very simple internal structure and minimal back pressure, is also installed to remove remaining wideband noise. To make the system to be small enough to be practical, conventional muffler is also installed and used in low rpm range and active muffler is only employed in high rpm range. Noise reduction of the proposed system is comparable to conventional passive muffler. The engine dynamo test has proved the proposed system can recover almost all the torque lost by conventional muffler.

키워드

참고문헌

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  7. 황요하, '소음전달 파이프의 경로차이를 이용 한 능동소음 제어방법 및 그 장치', 대한민국특허 85545
  8. 이종민, 김경목, 손동구, 이장현, 황요하, 2001, '전달경로의 차이를 이용한 차량용 반능동형 머플러 의 특성에 관한 연구', 한국소음진동공학회지, 제 11 권 제 3 호, pp. 401-410
  9. Hwang, Y., et al., 2001, 'New Active Muffler System using Variable Length Bypass Exhaust Pipes and a Very Low Back Pressure Muffler', InterNoise 2001, Hague, Holland, 27-30 August, pp. 719-722
  10. Hwang, Y., et al., 2001, 'New Active Exhaust Noise Control Method Using Destructive Interference by Difference of Transmission Paths', 8th International Congress on Sound and Vibration, Hong Kong, China, 2-6 July, pp. 1593-1600

피인용 문헌

  1. Optimal Design of a Muffler with Perforated Plates Considering Pressure Drop vol.23, pp.4, 2013, https://doi.org/10.5050/KSNVE.2013.23.4.372