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크레인의 정밀한 정지와 잔류진동 억제를 위한 개선된 입력 성형기법
배규현(Gyu-Hyun Bae),홍성욱(Seong-Wook Hong) Korean Society for Precision Engineering 2013 한국정밀공학회지 Vol.30 No.7
Industrial cranes are indispensable equipment in heavy industry. However, unwanted vibrations in cranes often cause accidents. Input shaping is widely accepted as a useful tool for removing residual vibration in cranes. A unity magnitude zero vibration (UMZV) input shaper is often used for cranes driven by on?off-type motors. However, although a UMZV input shaper minimizes residual vibration, the input shaper cannot prevent the crane from moving slightly further than expected from the original command. This paper describes an improved method of input shaping that can compensate for position inaccuracies, as well as remove the residual vibration of cranes. Experiments were performed to validate the proposed input-shaping method, illustrated through numerical simulations.
압전구동기 히스테리시스를 고려한 마이크로스테이지 모델링 및 특성 개선
배규현(Gyu-Hyun Bae),최수창(Soo-Chang Choi),이득우(Deng-Woo Lee),홍성욱(Seong-Wook Hong) 한국생산제조학회 2009 한국생산제조시스템학회 학술발표대회 논문집 Vol.2009 No.10
Precise stages often employ piezoactuators of which inherent hysteretic characteristics cause a nonlinear behavior to the stages. This paper presents a dynamic model for a micro-stage with a displacement magnification mechanism which includes the hysterisis model for the piezoactuators. The previous study reveals that the proposed micro-stage provides large displacement but it is subjected to severe residual vibration because of little damping engaged in the displacement magnification mechanism. Although the input shaping method is useful for reducing such residual vibration, it proves to be ineffective when a large input is applied to the system. The present paper investigates the dynamic characteristics of the system of which piezoactuator characteristics are included. The simulation results show that the actuator hysterisis can change the dynamic characteristics of the system and the employment of robust input shapers is able to compensate the performance deterioration of input shaping due to the hysterisis.
회전속도에 따른 고속 스핀들의 돌출량 예측에 관한 연구
배규현(Gyu-Hyun Bae),이찬홍(Chan-Hong Lee),황주호(Jooho Hwang),홍성욱(Seong-Wook Hong) Korean Society for Precision Engineering 2012 한국정밀공학회지 Vol.29 No.6
This paper presents an estimation procedure for axial displacement in spindle equipped with angular contact ball bearings due to rotational speed. High-speed spindle-bearing system experiences axial displacement due to thermal expansion and rotational speed-dependent characteristics of angular contact ball bearings. This paper deals with the axial displacement caused by the rotational speed-dependent effects such as centrifugal force and gyroscopic moments. To this end, a bearing dynamic model is established that includes all the static and dynamic properties of angular contact ball bearing. An analytical formula to calculate the axial displacement based on contact angles between ball and races is derived to discuss the physics regarding the axial displacement in spindle. The proposed dynamic model is compared with a reference and a commercial program. Numerical examples are presented to show the effects of centrifugal force and gyroscopic moment on the axial displacement. The proposed model is also validated with an experimental result.
배규현(Gyu-Hyun Bae),홍성욱(Seong-Wook Hong),박상원(Sang-Won Park) 한국생산제조학회 2008 한국생산제조시스템학회 학술발표대회 논문집 Vol.2008 No.10
Input shaping is widely accepted to be a useful tool for removing residual vibration in cranes. The UMZV (unity magnitude zero vibration) input shaper is often employed for cranes driven by on-off type motors. However, the UMZV input shaper makes the cranes move slightly further than expected from the original command while it can remove the residual vibration out of the cranes. This paper deals with a method of input shaping scheme which can compensate the position inaccuracy as well as remove the residual vibration of cranes. The proposed method is illustrated through a numerical simulation.
입력성형기법을 이용한 변위증폭형 마이크로스테이지 잔류진동제어
배규현(Gyu-Hyun Bae),송은혜(Eun-Hye Song),강중옥(Joong-Ok Kang),홍성욱(Seong-Wook Hong) 한국생산제조학회 2009 한국생산제조시스템학회 학술발표대회 논문집 Vol.2009 No.5
This paper presents a result of application of input shaping to a micro-stage with a displacement amplification mechanism. The stage considered in this study is subjected to severe residual vibration in its lever mechanism to amplify displacement. The system dynamics exhibit some nonlinear nature due to the hysteresis of the PZT actuator. Input shaping method is successfully applied to the system so as to eliminate residual vibration from the system. The experimental study also shows that staircase input is useful to avoid the performance degrade by the nonlinear characteristics.
각접촉 볼베어링으로 지지된 스핀들의 정렬오차에 의한 동특성 변화 해석
배규현(Gyu-Hyun Bae),홍성욱(Seong-Wook Hong),윤영석(Young-Seok Yoon) 한국생산제조학회 2014 한국생산제조학회지 Vol.23 No.4
This paper presents the dynamic modeling and analysis results for a spindle supported by angular contact ball bearings (ACBBs) subjected to angular misalignment. Although ACBBs are widely used in spindle systems, their characteristics in regard to angular misalignment have rarely been investigated. A simulation program was developed to calculate the dynamic characteristics of a simple spindle model that is supported by angular contact ball bearings subjected to angular misalignment. Angular misalignment is shown to introduce anisotropy into the angular contact ball bearings and then split the natural frequencies in spindles. Simulations were also performed to show the possibility of evaluating bearing misalignment using natural frequency measurements.
압전구동기 히스테리시스를 고려한 마이크로스테이지 모델링 및 특성 개선
배규현(Gyu-Hyun Bae),최수창(Soo-Chang Choi),이득우(Deng-Woo Lee),홍성욱(Seong-Wook Hong) 한국생산제조학회 2009 한국공작기계학회 추계학술대회논문집 Vol.2009 No.-
Precise stages often employ piezoactuators of which inherent hysteretic characteristics cause a nonlinear behavior to the stages. This paper presents a dynamic model for a micro-stage with a displacement magnification mechanism which includes the hysterisis model for the piezoactuators. The previous study reveals that the proposed micro-stage provides large displacement but it is subjected to severe residual vibration because of little damping engaged in the displacement magnification mechanism. Although the input shaping method is useful for reducing such residual vibration, it proves to be ineffective when a large input is applied to the system. The present paper investigates the dynamic characteristics of the system of which piezoactuator characteristics are included. The simulation results show that the actuator hysterisis can change the dynamic characteristics of the system and the employment of robust input shapers is able to compensate the performance deterioration of input shaping due to the hysterisis.
Fatigue Life Analysis for Angular Contact Ball Bearing with Angular Misalignment
배규현(Gyu-Hyun Bae),통반칸(Van-Canh Tong),홍성욱(Seong-Wook Hong) Korean Society for Precision Engineering 2016 한국정밀공학회지 Vol.33 No.1
Angular misalignment has a significant effect on the characteristics of angular contact ball bearings (ACBBs). This paper presents an analysis of fatigue life for ACBBs subjected to angular misalignment. A simulation model is developed with de Mul’s bearing model and the ISO basic reference rating life model. Simulation is performed to calculate the life of the ACBBs subjected to angular misalignment. The numerical results show that angular misalignment influences the load distribution significantly, thus reducing the bearing rating life. The fatigue life of ACBBs is decreased by angular misalignment regardless of axial preload, external radial load and rotational speed. The results show that angular misalignment should be maintained at less than 1mrad for ACBBs.
탄성 회전체 베어링 계의 불균형 응답 저감을 위한 동흡진기 개발
유태규(Tae-Gyu Yu),배규현(Gyu-Hyun Bae),김길환(Kil-Hwan Kim),홍성욱(Seong-Wook Hong) 한국생산제조학회 2012 한국생산제조학회지 Vol.21 No.1
This paper presents a novel dynamic vibration absorber (DVA) to suppress the unbalance response of flexible rotor-bearing systems. The DVA unit consists of two DVAs, an adapter to place the DVAs and an adapter frame to locate the adapter. The essential feature of the proposed DVA unit is to place itself on any desirable location of the shaft without disassembling the rotor-bearing system under consideration. A simulation with a 3D element based commercial rotor dynamic software is made to test the possibility of the proposed DVA on the suppression of unbalance response in rotor-bearing systems. Experiments are performed to validate the proposed DVA unit. The simulation and experiments show that the proposed DVA unit is very effective to suppress the unbalance response in rotor-bearing system at designated rotational speeds of interest.