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이성구(Sunggu Lee),박대종(Daejong Park),권세진(Sejin Kwon) 한국추진공학회 2011 한국추진공학회 학술대회논문집 Vol.2011 No.11
과산화수소와 케로신을 이용한 이원액체추진제 로켓엔진을 위한 산화제 터보펌프를 설계하였으며 수류시험을 통해 설계된 터보펌프의 작동여부를 실험하였다. 과산화수소 터보펌프의 설계조건을 결정하고 펌프의 임펠러를 설계하였다. 펌프를 구동하기 위한 터빈을 차량용 터보차저로 선정하였으며 터빈 맵을 이용하여 가스발생기를 설계하였다. 펌프, 터빈과 가스발생기를 통합하여 터보펌프 시스템을 구축하였으며 수류시험을 통해 터보펌프 시스템이 1.47 bar의 압력으로 3.4 kg/s의 유량을 공급하는 것을 확인하였다. Hydrogen peroxide turbopump was designed for bi-propellant liquid rocket engine using hydrogen peroxide and kerosene as propellants. Turbopump operation was verified through water tests. Design conditions of hydrogen peroxide turbopump were determined, and impeller was designed. Turbine which drives pump was selected from commercial turbocharger. Gas generator was designed by reference from turbine map. Pump, turbine, gas generator were integrated, and turbopump system was constructed. Turbopump supplied water by 1.47 bar of pressure and as well as 3.4 kg/s of mass flow rate.
생성적 적대 신경망 기반의 CCU 자동화 평가 강화 방법
이재영(Jaeyoung Lee),최두일(Dooil Choi),이성구(Sunggu Yi),이재환(Jaehwan Lee) 한국자동차공학회 2020 한국자동차공학회 부문종합 학술대회 Vol.2020 No.7
The number of controllers fitted continues to increase as the functional requirements of the vehicle become more advanced. Controller area network (CAN), CAN with flexible data rate and Ethernet are used to exchange information between controllers. Central communication unit (CCU) was developed to manage the entire network and the information transmission between hybrid networks. CCU is capable of connecting the vehicles internal and external networks using modems as well as the internal network. Therefore, vehicle to everything (V2X), over the air (OTA) and vehicle remote control functions can also be fused. The difficulty of system evaluation also increases because the functions of CCU become more complex. CCU is connected to all communication networks in the vehicle and receives hundreds of inputs via communication. If only certain signal values are monitored, it is easy to know whether they are normal or not. However, it is difficult to intuitively check whether the output values are normal when the entire input changes at the same time. In this paper, we propose a CCU automation assessment reinforcement method based on generative adversarial neural network (GAN) to overcome the limitations of rulebased system evaluations. The proposed system uses time series GAN to generate input signals similar to the actual vehicle. In addition, abnormality detection method is used to determine probability of abnormalities in CCU. To verify the proposed method, by using signals acquired from actual vehicles, an experiment is conducted to determine if there are any new problems by regenerating the input signal of CCU. It improves CCU system evaluation reliability since it increases test coverage a lot.
배재남(Jaenam Bae),임승빈(Seungbin Lim),김기찬(Kichan Kim),정대성(Daesung Jung),이성구(Sunggu Lee),이주(Ju Lee) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.10
유한요소법을 사용한 전기기기의 해석에서는 움직임을 고려한 해석이 필수적이다. 본 논문에서는 전기기기의 유한요소 해석시 움직임을 고려하기 위한 방안으로써 Moving Surface기법을 소개하고 이 기법의 적용방법 및 장단점에 관하여 논하였다. 또한 이 기법을 검증하기 위하여 Moving Surface기법을 적용한 유한요소해석 프로그램을 개발하고, 개발한 프로그램을 사용하여 실제 모델을 해석해 그 결과치를 실험치와 비교함으로써 타당성을 입증하였다.
Manufacturing Process of Micro-drill
Kim, Gunhoi,Lee, Sunggu,Lee, Jeakyung,Kwon, Kyusik 한국공작기계학회 2001 한국공작기계학회 춘계학술대회논문집 Vol.2001 No.-
Resently, reduction of industrial products in size and weight has increased by the application of micro-drill for gadgets of high precision and gave rise to a great interest in a micro-drilling. Due to the lack of tool stiffness and the chip packing, micro-drilling requires not only the robust tool structure which has not affected by the vibration, but also the effective drilling methods designed to prevent tool fracture from cutting troubles. Firstly, this paper presents a new manufacturing process of micro-drill for improving the product rate and an optimum shape of micro-drill for lengthening the tool life, and secondly suggests between tool life and drilling torque acquired in the in process monitoring system.