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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.
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.
Noise Evaluation Considering the Uncertainty Variation According to Frequency
Lee Chulwon(이철원),Koo SeungJun(구승준),Kong Young Mo(공영모) 한국소음진동공학회 2014 한국소음진동공학회 학술대회논문집 Vol.2014 No.4
In the evaluation of measured noise data, tolerance shall be decided based on the uncertainty. The uncertainty has frequency variations due to the different standard deviations at each frequency. Therefore, tolerance shall be differently decided for each frequency with the same confidence probability. In the report, the evaluation method considering the frequency variation of uncertainty will be introduced. From the approach, considering the actual noise distribution characteristics of the ships, the tolerance shall be decided for each frequency with the same probability, but the overall averaged value shall be kept to the value designated in each notation.