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RISS 인기검색어
- 검색키워드
- 저자 : 최종필(J.P.Choi) (검색결과 24 건)
- 무료
- 기관 내 무료
- 유료
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최종필(J. P. Choi),김광수(K. S. Kim),서영호(Y. H. Seo),구보성(B. S. Ku),장재혁(J. H. Jang),김병희(B. H. Kim) 한국소성·가공학회 2008 소성가공 : 한국소성가공학회지 Vol.17 No.8
This paper presents a micro air pump based on the synthetic jet to supply reactant at the cathode side for micro fuel cells. The synthetic jet is a zero mass flux device that converts electrical energy into the momentum. The synthetic jet actuation is usually generated by a traditional PZT-driven actuator, which consists of a small cylindrical cavity, orifices and PZT diaphragms. Therefore, it is very important that the design parameters are optimized because of the simple configuration. To design the synthetic jet micro air pump, a numerical analysis has been conducted for flow characteristics with respect to various geometries. From results of numerical analysis, the micro air pump has been fabricated by the PDMS replication process. The most important design factors of the micro air pump in micro fuel cells are the small size and low power consumption. To satisfy the design targets, we used SP4423 micro chip that is high voltage output DC-AC converter to control the PZT. The SP4423 micro chips can operate from 2.2~6V power supply(or battery) and is capable of supplying up to 200V signals. So it is possible to make small size controller and low power consumption under 0.1W. The size of micro air pump was 16 × 13 × 3 mm3 and the performance test was conducted. With a voltage of 3V at 800Hz, the air pump’s flow rate was 2.4cc/min and its power consumption was only 0.15W.
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최종필(J. P. Choi),이광호(G. H. Lee),이혜진(H. J. Lee),이낙규(N. G. Lee),김병희(B. H. Kim) 한국생산제조학회 2006 한국생산제조시스템학회 학술발표대회 논문집 Vol.2006 No.5
This paper presents the design of inchworm motor for high precision actuator system of large displacement and high force. An inchworm actuator can perform long strokes by repeating the clamping and extension sequence. It can attain high resolution and high force from the accurate displacement of extension and contraction motion. The proposed inchworm actuator consists of two clamping parts on the top and the bottom side of the inchworm body, and one extension part in the middle of the actuator. The two clamping piezoelectric(PZT) are provide the holding force and the extending PZT is provide the displacement of tool guide. In generally, PZT has the low tensile strength and shear. Therefore, design of the inchworm motor has been focused on optimizing the pre-load housing mechanism to reduce the shear force. The preload also creates additional return forces to aid in the release of the clamping mechanisms. The detailed design of the pre-load mechanism was performed using finite element analysis. A prototypeof the inchworm motor was fabricated and tested.
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최종필(J. P. Choi),이광호(G. H. Lee),이혜진(H. J. Lee),이낙규(N. G. Lee),김병희(B. H. Kim) 한국생산제조학회 2006 한국공작기계학회 춘계학술대회논문집 Vol.2006 No.-
This paper presents the design of inchworm motor for high precision actuator system of large displacement and high force. An inchworm actuator can perform long strokes by repeating the clamping and extension sequence. It can attain high resolution and high force from the accurate displacement of extension and contraction motion. The proposed inchworm actuator consists of two clamping parts on the top and the bottom side of the inchworm body, and one extension part in the middle of the actuator. The two clamping piezoelectric(PZT) are provide the holding force and the extending PZT is provide the displacement of tool guide. In generally, PZT has the low tensile strength and shear. Therefore, design of the inchworm motor has been focused on optimizing the pre-load housing mechanism to reduce the shear force. The preload also creates additional return forces to aid in the release of the clamping mechanisms. The detailed design of the pre-load mechanism was performed using finite element analysis. A prototypeof the inchworm motor was fabricated and tested.
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모터의 상태 감시를 위한 효율적인 모터 감시 및 진단 시스템의 설계 및 구현
최정환(J.H. Choi),박현수(H.S. Park),이동준(D.Z. Lee),어수영(S.Y. Eo),강태구(T.K. Kang),정헌표(H.P. Jeong),최종필(J.P. Choi) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.10
본 논문은 현장에 운전 중인 모터를 효율적으로 고압 모터 감시 및 진단 기법을 검토하고 현장에 보다 적합한 고압모터감시 및 진단 시스템을 설계 및 개발에 관하여 기술하였다. 고압 모터의 감시 및 진단 방법은 MCSA(Motor Current Signature Analysis) 기법을 기반으로 하여 순시전력 , 공극토크, 진동분석 등 다양한 기법이 있으며 이 기법을 적용한 시스템이 출시되고 있다. 그러나 사용자의 요구 및 편이가 반영되지 않아 그대로 적용하기에는 어려움이 있다. 따라서 본 논문에서는 국내의 실정 및 사용자의 편이 맞도록 진단 시스템을 개발의 필요성이 요구되어 다양한 검출 요소를 종합적으로 이용한 보다 현장에 적합하고 유용한 모터 감시 시스템을 설계하였다.
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박찬진(C. J. Park),최종필(J. P. Choi),박동영(D. Y. Park),홍남표(N. P. Hong),이혜진(H. J. Lee),이낙규(N. K. Lee),김성욱(S. O. Kim),주은덕(Andy Chu),김병희(B. H. Kim) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.10
In this paper, the low frequency vibration forming system is developed for micro-patterns formation on the metal substrate. many researchers have studied about micro-forming technologies such as micro deep drawing, press forming, forging, extrusion etc. for the formation of precise micro-patterns on the surface of metal substrates, multi-step forming process must be used to improve qualifies of the deformed patterns. Since the low frequency vibration forming system could easily deform the surface of metal substrates, several steps of multi-step forming process should be removed by using the low frequency vibration forming system. In order to find optimal process conditions, we have carried out low frequency vibration forming process with varying the vibration frequency from 110Hz to 500Hz.
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박찬진(C.J. Park),최종필(J.P. Choi),박동영(D.Y. Park),홍남표(N.P. Hong),이혜진(H.J. Lee),이낙규(N.K. Lee),김성욱(S.O. Kim),주은덕(E.D. Joo),김병희(B.H. Kim) 한국생산제조학회 2009 한국생산제조시스템학회 학술발표대회 논문집 Vol.2009 No.5
In this paper, the ultrasonic vibration molding method is developed for forming micro patterns on the metal substrate. So many researchers study about the micro molding technology such as micro deep drawing, press forming, forging, extrusion etc. but if we want to make a micro pattern on the surface of the metal substrate, we must use multi-step forming process to maintain the size of the product or substrate. However, these problems can be solved by using ultrasonic vibration molding system. Because the ultrasonic vibration molding method deform the surface of mold easily. This paper describes the optimization techniques of ultrasonic vibration molding condition such as the frequency forming method and optimal frequency range to make a micro pattern on the metal substrate. The frequency range can be classified to ultrasonic range, high & low frequency range.
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저주파 가진 시스템에 의해 성형된 마이크로 패턴의 특성 분석
박찬진(C. J. Park),최종필(J. P. Choi),박동영(D. Y. Park),홍남표(N. P. Hong),이혜진(H. J. Lee),이낙규(N. K. Lee),김성욱(S. O. Kim),주은덕(Andy Chu),김병희(B. H. Kim) 한국생산제조학회 2009 한국공작기계학회 추계학술대회논문집 Vol.2009 No.-
Many researchers have developed several micro-forming technologies such as micro deep drawnig, micro press forming, micro forging, extrusion etc. for forming of precise micro-patterns on a surface of metal substrate but the multi-step forming processes have been used to improve quality of the deformed patterns. The low frequency vibration forming system, which developed in the research, can not only easily deform the surface of metal substrates but also can remove the couple of steps of the conventional multi-step forming process. In order to find optimal process conditions, lots of experiments were carried out under varying the vibration frequency from 100㎐ to 500㎐. As a experimental results, The desktop micro forming system has obtained better results from low frequency vibrations than non-vibration.
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