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박용재(Yongjai Park),남일광(Riguang Nam),강연준(Yeonjune Kang),박철민(Chulmin Park),채기상(Kisang Chae) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Statistical Energy Analysis has been widely applied to improve the accuracy of the prediction of vehicle interior noise. Especially, in airborne noise cases, SEA is very useful for predicting the Interior noise ofa vehicle if some parts of the vehicle model are changed. In this paper, a building and validating process of the full vehicle SEA model is presented. First, Sound Transmission Loss and Absorption Coefficient (α) of vehicle components were measured using a real vehicle. An airborne SEA model was built using the geometry information, and the component characteristics were modeled using STLs, and α's, which were measured or calculated. Then, the interior and exterior noises of a full vehicle were measured for various experimental conditions such as WOT (wide open throttle) condition and loudspeaker loading conditions, which were used for the validation of the SEA model. Finally, the predicted and the measured interior noises were compared, and the accuracies of the SEA model were identified for several loading conditions.
초정밀장비 미진동제어를 위한 기계식 가변감쇠시스템의 진동제어성능 연구
심다솔(DaSol Shim),전종균(ChongKeun Chun),박용재(YongJai Park),박상곤(SangGon Park),한현희(HyenHee Han) 한국소음진동공학회 2017 한국소음진동공학회 논문집 Vol.27 No.4
The precision equipment for precision processing, manufacturing, and inspection process are usually managed in a strictly vibration-controlled environment that uses vibration isolators. To complement the weaknesses of these isolators, we designed and tested two types of mechanical adjustable dampers with helical gear: a box-like adjustable damper with a comb-type orifice and a round damper with a wing-type orifice. Additionally, we designed two versions for the latter: a standard version and an enhanced version to improve the variable performance. We then compared the performance of these two versions during their modal tests. Not surprisingly, the test showed that the enhanced version was superior to the standard version in variable damping. For this reason, we expect this damper to be particularly useful to semiconductor manufacturing facilities where the precision equipment are located.