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박철우(Cheol Woo Park),천호정(Ho Jeong Cheon) Korean Society for Precision Engineering 2012 한국정밀공학회지 Vol.29 No.4
This study aims to discover the optimal pipe layout for a ship, which generally needs a lot of time, efforts and experiences. Genetic algorithm was utilized to search for the optimum. Here the optimum stands for the minimum pipe length between two given points. Genetic algorithm is applied to planar pipe layout problems to confirm plausible and efficiency. Sub-programs are written to find optimal layout for the problems. Obstacles are laid in between the starting point and the terminal point. Pipe is supposed to bypass those obstacles. Optimal layout between the specified two points can be found using the genetic algorithm. Each route was searched for three case models in two-dimensional plane. In consequence of this, it discovered the optimum route with the minimized distance in three case models. Through this study, it is possible to apply optimization of ship pipe route to an actual ship using genetic algorithm.
WAVESTAR형 파력발전장치의 유압식 2차변환장치의 물리모델 구축에 관한 연구
이정희,오재원,하윤진,박지용,천호정,김경환,Lee, Jung-Hee,Oh, Jaewon,Ha, Yoon-Jin,Park, Ji-Yong,Cheon, Ho-Jeong,Kim, Kyong-Hwan 한국산업융합학회 2020 한국산업융합학회 논문집 Vol.23 No.6
This study was conducted to develop an efficiency prediction program of a hydraulic secondary energy converter for calculating annual power generation of a Wavestar type wave power generator. Using the period and wave height obtained from the frequency domain analysis, the behavior of the floating body was obtained by assuming the sin function. The piston displacement and speed of the hydraulic cylinder were calculated considering the behavior of the floating body and the shape of the mechanism. The numerical simulation of the hydraulic system was performed by physically modeling the hydraulic cylinders, check valves, hydraulic motors, which are the main devices. In the future, this analysis program will be used to develop a program for estimating annual power generation of a moveable body type wave power generation device.
유연체 동역학적 해석을 이용한 엔진블록의 동응력 해석에 관한 연구
손창수(Chang Su Son),천호정(Ho Jeong Cheon),성활경(Hwal Gyeong Seong),윤건식(Keon Sik Yoon) Korean Society for Precision Engineering 2011 한국정밀공학회지 Vol.28 No.7
The dynamic stress of the diesel engine block is analyzed by using flexible-body dynamic analysis. Multiple loadings including the pressure load due to gas combustion, thermal load, and dynamic load are considered. Thermal load is assumed constant, however, pressure load and dynamic load are treated as time dependent. The present work is focused on the dynamic stress analysis, especially on finding critical points of the engine block. The analysis model includes four parts - engine block, generator, bed, and mounts. On the other hand, crank shaft, pistons, and main bearings are excluded from the model. However, their dynamic effects are applied by dynamic forces, obtained in the separate analysis. Dynamic stress is found by using flexible body dynamic analysis, and compared to the measured data.
이준오(Jun Oh Lee),성활경(Hwal Gyeng Seong),천호정(Ho Jeong Cheon) Korean Society for Precision Engineering 2008 한국정밀공학회지 Vol.25 No.9
Polynomial is used to optimize crown bowl shape of a marine medium speed diesel engine piston. The primary goal of this paper is that it's for an original design through a thermal stress and highest temperature minimum. Piston is modeled using solid element with 6 design variables defined the positional coordinate value. Global optimum of design variables are found and evaluated as developed and integrated with the optimum algorithm combining genetic algorithm(GA) and tabu search(TS). Iteration for optimization is performed based on the result of finite element analysis. After optimization, thermal stress and highest temperature reduced 0.68% and 1.42% more than initial geometry.
자연요소법과 유전자 알고리듬을 사용한 완공 평판의 최적설계
이상범(Sang Bum Lee),성활경(Hwal Gyeng Seong),천호정(Ho Jeong Cheon) Korean Society for Precision Engineering 2008 한국정밀공학회지 Vol.25 No.2
Natural element method(NEM) is quick in research activities by natural sciences and mechanical engineering fields, and from which good results are watched by various engineering fields and applied too. Howerer no paper or research about the applied case has announced yet. Therefore on this paper, I will rediscover an optimum design and apply NEM into other fields with NEM for existing optimum design of mainly using FEM. NEM and genetic algorithm(GA) are applied to optimize a membrane with a center hole. The optimal design obtained by NEM is compared to the counterpart obtained by the finite element method(FEM). Result by NEM is found to be better than the result by FEM. NEM can be a feasible analysis tool in design optimization.