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전종균(ChongKeun Chun),심다솔(Dasol Shim),박상곤(SangGon Park),한현희(HyunHee Han) 한국소음진동공학회 2016 한국소음진동공학회 학술대회논문집 Vol.2016 No.4
The award-winning manufacturing plants for semiconductor, TFT-LCD, and OLED manage their sub-micro vibrations strictly in order to raise their production yield rate and quality. The vibration environment required to manage the sub-micro vibrations of super-precision equipment is measured in the level of several micro(㎛). The permitted limits of vibration required depending on the characteristics and the process of super-precision equipment are also different. It is difficult to find a space to install the dustproof device of such super-precision equipment as it is difficult to maintain it. Based on its fluid characteristics, this study examined the damping force of a variable attenuator designed to solve the issue with resonance caused by an external vibration from outside. When the damping force changed according to the variable area of the variable attenuator and its fluid viscosity, the damping force increased in relation to the increase in the fluid viscosity and the orifice area.
의료용 로봇의 미진동제어를 위한 가변감쇠형 동조질량감쇠기 기술 개발
차운용(WoonYong Cha),전종균(ChongKeun Chun),박상곤(SangGon Park),한현희(HyunHee Han) 한국소음진동공학회 2014 한국소음진동공학회 논문집 Vol.24 No.9
Recently, the medical community has been enthusiastically welcoming robots that are able to provide high-quality medical services across the board, including assisting the surgeons during surgeries. In response, many higher education institutions and research facilities started to conduct various experiments and studies about these robots. During such research, it was discovered that the arm of one particular robot type that is being developed to assist surgeries are prone to vibrate even from the weakest impact, in addition to other residual vibration problems. We attempted to reduce such dynamic response by using a MF-TMD that is produced by adding magnetic fluid to ECD. We verified the MF-TMD’s performance by testing it within various frequency bands and attenuations. We then designed a cantilever that was structurally similar to the robot’s arm. We attached the MF-TMD to this cantilever and conducted a pilot experiment, which validated our hypothesis that MF-TMD will reduce the robot arm’s vibrations through its optimal damping ratio. Henceforth, we attached the MF-TMD to the robot arm in question and conducted a performance experiment in which we tuned the MF-TMD’s frequency and damping factor to its optimal level and measured the vibrations of the arm. The experiment demonstrated that the vibrations that occurred whenever the arms rotated were significantly reduced.
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.
MR 댐퍼의 비선형해석을 이용한 반능동형 제진대에 관한 연구
김도영(DoYoung Kim),전종균(ChongKeun Chun),권영철(영역) 한국소음진동공학회 2014 한국소음진동공학회 논문집 Vol.24 No.11
In this study, a semi-active isolator was constructed from applying a MR damper that used the MR fluid to an isolator. The parameter identification was also performed to determine the characteristics of this semi-active isolator during which the least squares method and the auxiliary variable method were applied to produce a value closest to the true value. In addition, the MR damper’s nonlinear damping force was closely analyzed to greatly reduce the range of error. Based on this analysis, it was discovered that the parameter tended to increase with more electric current. Such analysis of the dynamic properties of semi-active isolator proved that constructing an isolator that provides a more stable operation could be achieved.