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3D Printing 공정을 이용한 PDMS Mold 제작
김광윤(KwangYoon Kim),박석희(SukHee Park),이한빛(HanBit Lee),이낙규(NakGyu Lee),윤종헌(JongHun Yoon) 대한기계학회 2017 大韓機械學會論文集A Vol.41 No.6
최근 신체 생물학적 인터페이스와 인체 유사 로봇 공학(Human-like robotics) 분야에서 요구하는 임의적인 형상 제작이 가능하다는 이유로 3D 프린팅 기술에 대한 그 관심이 높아지고 있다. 본 연구의 주된 고려사항은 PDMS로 제작한 탄성 중합체로 지지되는 3D 패키징 생물학적 센서(bio-sensor)의 제작이다. 3D 프린팅 공정을 이용한 PDMS 성형 몰드의 제작은 신체의 표면에 따라 달라지는 임의적인 형상에 적합한 bio-sensor의 제작 뿐만 아니라 고형화 과정 중 균일한 두께분포의 PDMS 성형이 가능하다는 점에서 기존 공정과는 차별화된 중요성을 갖는다. 이와 관련하여 본 연구에서는 몰드를 이용한 PDMS의 제작 과정 중 이형과정 에서의 유연성과 PDMS의 고형화 과정에서 제작 공정의 특성을 만족시키기 위한 PDMS 성형 몰드의 설계에 있어 여러 소재의 부분 별 선택적 배열과 관련한 유한요소해석과 실제 몰드 제작을 통한 실험을 진행하였다. 3D printing technology has been a great interest in human bio-interfaces and human-like robotics since they require arbitrary and adaptive manufacturing. This research mainly concerns the 3D fabrication of a packed biosensor using elastomeric sheets made of PDMS. It is essential to design the PDMS molding with 3D printing since, in the case of biosensors, it should not only produce a conformal shape depending on an arbitrary skin surface but also guarantee a uniform thickness distribution during solidification in the PDMS prepolymer solution. To satisfy the characteristics of the PDMS molding, such as flexibility in the de-molding and stiffness in the solidification processes, multi-materials have been selectively applied to the PDMS molding design, which has been validated with finite element analyses and compared with the 3D printed molding.
STS304의 후열처리에 따른 용접부 미세조직과 기계적 특성 평가
장대한 ( Daehan Jang ),김광윤 ( Kwangyoon Kim ),김형찬 ( Hyoung Chan Kim ),전종배 ( Jong Bae Jeon ),남대근 ( Dae-geun Nam ),손근용 ( Keun Yong Sohn ),김병준 ( Byung Jun Kim ) 대한금속재료학회(구 대한금속학회) 2017 대한금속·재료학회지 Vol.55 No.9
Abstract: Austenitic stainless steels have excellent mechanical property and corrosion resistance, and are for these reasons used in demanding applications such as power plant, nuclear reactor and off-shore plant. Especially, austenitic stainless steel 304 (STS304) is mainly used as a pipe material in nuclear power plants. Submerged arc welding (SAW) is a commonly used method of welded steel pipes. This method has some problems of microstructure and mechanical properties such as heterogeneous microstructure, ductility decreases, brittleness of a weld region after SAW process. Especially, delta ferrite and dendrite structure is happened in the weld metal after welding process, which affects the decrease of toughness and ductility. Therefore, it requires the post weld heat treatment (PWHT) in order to solve these problems. In this study, welded STS304 was investigate the microstructure and mechanical properties after SAW process. In order to improve the toughness and ductility of weld region, PWHT was performed by controlling the delta-ferrite and dendrite structure. It was found that the mechanical property of the weld region were increased due to the decrease of the delta- ferrite and the recrystallization of the austenite structure after PWHT. (Received March 30, 2017; Accepted May 31, 2017)
전동식 파워스티어링(MDPS) 시스템 자기식 토크센서의 실차평가를 통한 외부자계 영향 연구
백순호(Soonho Baek),김광윤(Kwangyoon Kim),정선영(Sunyoung Cheong) 한국자동차공학회 2023 한국자동차공학회 학술대회 및 전시회 Vol.2023 No.11
In this study, the influence of an external magnetic field on the magnetic torque sensor applied to the motor driven power steering system was evaluated through an real vehicle test. The torque sensor is a component responsible for the vehicles steering assist function. It is affected by an external magnetic field, and it is important to evaluate and analyze it for real vehicle stability. In this study, the operation changes of the general magnetic torque sensor and the torque sensor which is robust from external magnetic field in various external magnetic environment conditions were analyzed. As a result of the experiment, it was confirmed that the magnetic torque sensors sensing error was generated depending on the external magnetic field or change in azimuth. These results suggest that factors affecting the external magnetic field related to the magnetic torque sensor should be considered and countermeasures should be prepared in the MDPS system design and development stage. The results of this study are expected to do an important role in improving the reliability and stability of MDPS systems and are expected to serve as guidelines that can lead to the development of more robust and accurate MDPS systems.
[구조강도부문] BRAKE JUDDER 개선을 위한 BRAKE DISC 최적 설계 기법 연구
신동철(DongChul Shin),김택조(TeakJo Kim),지태수(TaeSoo Chi),김광윤(KwangYoon Kim) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Thermal behavior of brake disc significantly affects brake performance and brake judder. This paper will document the thermal distorsion of brake disc so called coning and propose brake disc design factors which influence the coning. To investigate the thermal behavior of brake disc, thermal stress and transient FEM techniques were used. Several prototype discs were made and brake dynamo tests were performed to verify the simulation results. This optimized brake discs were applied to mass production.