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공영모(Y. M. Kong),최수현(S. H. Choi),송진대(J. D. Song),양보석(B. S. Yang) 한국동력기계공학회 2004 한국동력기계공학회 학술대회 논문집 Vol.- No.-
Recently, the vibration reduction at the local structure such as compass deck has continuously requested by ship owner and shipbuilder. Because crews are afflicted with them and severe vibration problems affect on the damage of structure. This study conducted to get an optimized stiffener size of compass deck to reduce the vibration level and decrease the weight of structure in ship. NASTRAN external call type optimization software (OptShip) which makes using a solver module from NASTRAN is used as an optimization tool. The results indicate that the optimum design is promising for real applications.
Development of the New Hybrid Evolutionary Algorithm for Low Vibration of Ship Structures
공영모(Kong, Young-Mo),최수현(Choi, Su-Hyun),송진대(Song, Jin-Dae),양보석(Yang, Bo-Suk) 한국소음진동공학회 2006 한국소음진동공학회 논문집 Vol.16 No.6
This paper proposes a RSM-based hybrid evolutionary Algorithm (RHEA) which combines the merits of the popular programs such as genetic algorithm (GA), tabu search method and response surface methodology (RSM). This algorithm, for improving the convergent speed that is thought to be the demerit of genetic algorithm, uses response surface methodology and simplex method. The mutation of GA offers random variety to finding the optimum solution. In this study, however, systematic variety can be secured through the use of tabu list. Efficiency of this method has been proven by applying traditional left functions and comparing the results to GA. It was also proved that the newly suggested algorithm is very effective to find the global optimum solution to minimize the weight for avoiding the resonance of fresh water tank that is placed in the after body area of ship. According to the study, GA's convergent speed in initial stages is improved by using RSM method. An optimized solution is calculated without the evaluation of additional actual objective function. In a summary, it is concluded that RHEA is a very powerful global optimization algorithm from the view point of convergent speed and global search ability.
선박 구조물의 진동 최적설계를 위한 NASTRAN 기반 최적화 프레임웍의 제안
공영모(Kong, Y.M.),최수현(Choi, S.H.),채상일(Chae, S.I.),송진대(Song, J.D.),김용한(Kim, Y.H.),양보석(Yang, B.S.) 한국소음진동공학회 2005 한국소음진동공학회 논문집 Vol.15 No.11
Recently, the issue of ship nitration due to the large scale, high speed and lightweight of ship is emerging. For pleasantness in the cabin, shipbuilders are asked for strict vibration criteria and the degree of nitration level at a deckhouse became an important condition for taking order from customers. This study proposes a new optimization framework that is NASTRAN external call type optimization method (OptShip) and applies to an optimum design to decrease the nitration level of a deckhouse. The merits of this method are capable of using of global searching method and selecting of various objective function and design variables. The global optimization algorithms used here are random tabu search method which has fast converging speed and searches various size domains and genetic algorithm which searches multi-point solutions and has a good search capability in a complex space. By adapting OptShip to full-scale model, the validity of the suggested method was investigated.
감압밸브에 후단에서 발생하는 배관소음 예측에 관한 연구
김극수(Kuk-Su Kim),공영모(Young-Mo Kong),박준호(Jun-Ho Park),정철웅(Cheolung Cheong) 한국소음진동공학회 2016 한국소음진동공학회 학술대회논문집 Vol.2016 No.4
High-pressure gases are produced in the process of oil production in offshore plant and pressure relief devices or valves are widely used to protect the system due to the high pressure gas. These gas pipes are connected to the flare head and bunt out at the flare stack or vented to the atmosphere if the gases are not toxic. The excessive noise is generated in this process at a pressure relief valve used to discharge a high pressure gas to the outside quickly. In this study, valve noise was estimated for the simple compression expansion pipe through CFD(Computational Fluid Dynamics). Steady state analysis was carried out and the results are compared with those of a theoretical equation and unsteady analysis was carried out to estimate the fluctuation pressure in a pipe.