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최종필(JongPil Choi),김병희(Byeonghee Kim),최우석(Woo-Seok Choi),김시동(Si-Dong Kim),민준원(Joon-Won Min),유승을(Seung-Eul Yoo) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
In recent years, concern among car users about air quality inside car cabins has been steadily increasing. A vehicle exhaust gases such as carbon monoxide(CO) and nitrogen oxides(NOx) entering the cabin not only reduce the quality of experience for everyone in the car, but are also harmful to the health. Therefore, an air quality sensor(AQS) system which can perform this function is issued. In this paper, the design of channel structure for an automotive AQS system was studied by computational fluid dynamic analysis according to the design parameters such as the number of air inlet, membrane porosity and permeability. Form these simulation results, the AQS system was developed and the performance test was conducted. And then we proposed new design of the AQS system to improve the performances which are response time and sensitivity.
저온 양극산화공정을 이용한 반사 방지용 폴리머 마스터 제작
신홍규(Honggue Shin),권종태(Jongtae Kwon),서영호(Youngho Seo),김병희(Byeonghee Kim),박창민(Changmin Park),이재숙(Jaesuk Lee) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
A simple method for the fabrication of porous nano-master for antireflective surface is presented. In conventional fabrication methods for antireflective surface, coating method with low refractive index has usually been used. However, it is required to have high cost and long times for mass production. In this paper, we suggested the fabrication method of antireflective surface by the hot embossing process using the porous nano patterned master on silicon wafer fabricated by low-temperature anodic aluminum oxidation. Through multi-AAO and etching processes, nano patterned master with high aspect ratio was fabricated at the large area. Pore diameter and inter-pore distance are about 150㎚ and from 150 to 200㎚. In order to replicate anti-reflective structure, hot embossing process was performed by varying the processing parameters such as temperature, pressure and embossing time etc. Finally, antireflective surface can be successfully obtained after etching process to remove selectively silicon layer of AAO master.
Synthetic Jet Air Blower를 이용한 Free Breathing 연료전지의 성능 평가
최종필(JongPil Choi),구보성(BoSung Ku),장재혁(JaeHyuk Jang),서영호(YoungHo Seo),김병희(ByeongHee Kim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
An free breathing proton exchange membrane fuel cell (PEMFC) was developed. This paper presents a study of the several effect on the performance of a fuel cell such as air flow rate, opening ratio, and cathode structures. Especially, an air flow rate is critical condition to improve the fuel cell performance. In this paper, we developed a synthetic jet micro air blower to supply high stoichiometric air. The synthetic jet actuation is usually generated by a traditional PZT-driven actuator, which consists of a small cylindrical cavity, orifices and PZT diaphragms. In comparison with free convection fuel cells, the forced-convection fuel cell which equipped synthetic jet micro air blower brings higher performance and stability for long term test. Also, power consumption of the synthetic jet micro air blower is under 0.3W. The results show that the maximum power density was 188㎽/㎠ at 400㎃/cm2.The maximum power density was higher 40% than power density of free convection fuel cell.
마이크로 펀칭시스템 구현을 위한 심벌변위확대기구의 설계
최종필(JongPil Choi),이광호(KwangHo Lee),이해진(Hye-Jin Lee),이낙규(Nak-Gue Lee),김성욱(Seonguk Kim),주은덕(Andy Chu),김병희(ByeongHee Kim) 한국생산제조학회 2009 한국생산제조학회지 Vol.18 No.1
This paper presents the development of a micro punching system with modified cymbal mechanism. To realize the micro punching, we introduced the hybrid system with a macro moving part and micro punching part. The macro moving part consists of a ball screw, a linear guide and the micro step motor and micro punching part includes the PZT actuators and displacement amplification device with modified cymbal mechanism. The PZT actuator is capable of producing very large force, but they provide only limited displacements which are several micro meters. Thus the displacement amplification device is necessary to make those actuators more efficient and useful. For this purpose, a cymbal mechanism in series is proposed. The finite element method was used to design the cymbal mechanism and to analyze the mode shape of the one. The displacement and mode shape error between the FEM results and experiments are within 10%. A considerable design effort has been focused on optimizing the flexure hinge to increase the output displacement and punching force.
인치웜모터를 이용한 마이크로 프레스용 고정밀 구동기의 개발
최종필(JongPil Choi),남권선(KwangSun Nam),이해진(Hye-Jin Lee),이낙규(Nak-Gue Lee),김병희(ByeongHee Kim) 한국생산제조학회 2009 한국생산제조학회지 Vol.18 No.2
This paper presents the fabrication of inchworm motor for high precision actuator system of large displacement and high force. The inchworm motor consists of a extend actuator that provides displacement of tool guide and two clamping actuators which provide the holding force. In order to avoid the PZT fracture, design of pre-load housing was conducted by flexure hinge structure, because PZT actuator has low tensile and shear. To design the pre-load housing and optimize the clamping mechanism, the static and dynamic analysis were conducted by finite element method. From these results, a prototype of the inchworm motor was fabricated and dynamic characteristic with respect to the various frequency was tested. The maximum velocity of the inchworm motor was 41.1㎛/s at 16㎐.
전산유체해석을 이용한 자동차용 AQS 시스템의 유로구조 설계
최종필,김병희,최우석,김시동,민준원,유승을 한국공작기계학회 2009 한국공작기계학회 춘계학술대회논문집 Vol.2009 No.-
In recent years, concern among car users about air quality inside car cabins has been steadily increasing. A vehicle exhaust gases such as carbon monoxide(CO) and nitrogen oxides(NOx) entering the cabin not only reduce the quality of experience for everyone in the car, but are also harmful to the health. Therefore, an air quality sensor(AQS) system which can perform this function is issued. In this paper, the design of channel structure for automotive AQS system was studied by computational fluid dynamic analysis according to the design parameters such as the number of air inlet, membrane porosity and permeability. Form simulation results, the AQS system was developed and the performance test was conducted.
최종필,이해진,이낙규,김성욱,주은덕,김병희 한국공작기계학회 2008 한국공작기계학회 추계학술대회논문집 Vol.2008 No.-
This paper presents the micro positioning/tilting system with flexure. The basic principle and the operation mechanism were introduced. The micro positioning system consists of a moving platform, three piezoelectric actuators, clamper and flexure hinges. The flexure hinges which are beam hinge, spherical notch joint, wide range hinge are designed and fabricated. The FEM simulation was used to design and optimize the flexure hinges mechanism. Form the result of FEM simulation we fabricated the micro position system by CNC machine and WEDM with the material of SUS 304. To evaluate the performance of the fabricated micro positioning system, the output displacement of the moving plate in vertical direction was measured and tested.