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장경진(Kyoung-Jin Chang),유병규(Byung Kyu Yoo),정승균(Seung-Gyoon Jung) 한국자동차공학회 2002 한국자동차공학회 Symposium Vol.2002 No.11
Source decomposition is the foundation of vehicle sound engineering. The goal is to separate binaural sound<br/> recorded inside the passenger compartment of a vehicle during normal driving into the contribution of each major<br/> physical source. This paper describes the theory and definitions of a sound source decomposition method based on a<br/> multiple input coherence analysis (MICA). Finally, a practical example of the method is illustrated by identifying the<br/> road noise sources.
자동변속기차량의 댐퍼클러치 직결역 확대에 따른 실내부밍 개선
민경재(Kyoung-Jae Min),강철우(Cheol-Woo Kang),정승균(Seung-Gyoon Jung) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
For the purpose of enhancing the fuel economy in compact cars, it has been tried to expand the lock-up rpm of damper clutch in automatic transmission. But this way is likely to cause the interior booming noise accompanied by the body vibration. It is why lowering the engine rpm, where the damper starts to be locked up is, causes powertrain vibration increases due to the shortage of the engine power needed by the vehicle load.<br/> Therefore, in this study, the causes and paths of the booming noise and body vibration coming from expanding the lock-up rpm will be investigated. That is, the following questions will be examined.: How much the vibration of the powertrain increases, how the vibration of the powertrain transfers and thus, how and how much the interior booming noise increases.<br/> Specially, using RMA(Running Mode Analysis) method, the principal vibration path and the resonance of vehicle body will be investigated. Through investigation, this study will propose a few kinds of structural modifications and among those modifications the optimized modification will be adopted as the refinement of the booming noise and the body vibration.