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압축 공기 냉각을 이용한 자기 변형 구동기의 열해석에 관한 연구
곽용길,황진동,김선호,안중환,Kwak, Yong-Kil,Mostofa, G.,Hwang, Jin-Dong,Kim, Sun-Ho,Ahn, Jung-Hwan 한국생산제조학회 2009 한국생산제조학회지 Vol.26 No.3
Precision positioning system with magnetostrictive actuator(MA) has widely used in manufacturing devices to control the positioning accuracy to meet the high load and stroke requirements. It has many advantage in comparison with piezoelectic actuator; high force, high strain, high efficient etc. But, the performance of Terfenol-D, the commercially available magnetostrictive material, is highly dependent on the prestress, magnetic field intensity and temperature. Therefore, thermal strain of magnetostrictive material obstructs precision position control of magnetostrictive actuator, magnetostrictive actuator is need of cooling system. In this paper, cooling system using compressed cold air is developed and proper temperature and velocity of compressed cold air is studied by thermal analysis according to applied current.
압축 공기 냉각을 이용한 자기 변형 액추에이터의 위치 추종 성능 향상
곽용길,황진동,김철민,김선호,안중환,Kwak, Yong-Kil,Hwang, Jin-Dong,Kim, Churl-Min,Kim, Sun-Ho,Ahn, Jung-Hwan 한국생산제조학회 2007 한국생산제조학회지 Vol.16 No.4
Precision positioning system with magnetostrictive actuator(MA) has widely used in manufacturing devices to control the positioning accuracy to meet the high load and stroke requirements. It has many advantage in comparison with piezoelectric actuator; high force, high strain, high efficient etc. But, the performance of Terfenol-D, the commercially available magnetostrictive material, is highly dependent on the prestress, magnetic field intensity and temperature. This paper present an experimental investigation of the temperature effect on displacement characteristics of magnetostrictive actuator. In this paper, compressed cold air is proposed to improve of positioning accuracy of magnetostrictive actuator. The compressed cold air cooling system has good cooling effect Experimental results confirming the effectiveness of the proposed cooling system as high precision positioning system are also has presented in this paper.
보이스 코일 액츄에이터의 PWM 제어에서 듀티비-변위 모델 연구
황진동(Jin-Dong Hwang),곽용길(Yong-Kil Kwak),김주현(Ju-Hyun Kim),김선호(Sun-Ho Kim),안중환(Jung-Hwan Ahn) 한국기계가공학회 2007 한국기계가공학회지 Vol.6 No.2
Voice coil actuator is used linear motion system that requires precision positioning control. In order to control precision positioning of voice coil actuator, relation model between duty ratio and moving displacement of voice coil actuator is needed. This paper present a duty ratio - displacement model in PWM control of voice coil actuator. Transfer function of voice coil actuator is obtained by combining voice coil motor's equation of motion with the equation of circuit and characteristic of voice coil motor. Consider to initial condition of velocity and current, transfer function is transformed mathematical model. The induced model can predict output displacement, velocity and current according to duty ratio and amplitude. The model is verified by experimental tests such as velocity and displacement response of voice coil motor. Simulated results have tracking errors of less than 10 percent of experimental results.
이효렬(Hyo Ryeol Lee),곽용길(Yong Kil Kwak),김화영(Hwa Young Kim),안중환(Jung Hwan Ahn),김복만(Bok Man Kim),신진오(Jin Oh Shin) 한국생산제조학회 2011 한국생산제조시스템학회 학술발표대회 논문집 Vol.2011 No.4
Recently, demand of NGV (Natural Gas Vehicle) is increasing to reduce environmental pollution. The automatic valve which is manual operating type and automatic operating type as a one body is attached on High pressure fuel tank for NGV. In this Paper, To find pressure in a developed prototype auto-valve, flow analysis by ANSYS CFX is accomplished. From the flow analysis results, equivalent stress and deformations of valve body are found and the valve body strength are estimated. The gas pressure in developed prototype valve is 199.3 bar to 200bar and equivalent stress o valve body is 0.0516㎫ to 177.4㎫, deformation is 0.0768㎜ to 0.0692㎜