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현장환,Hyeon, Jang-Hwan 대한기계학회 1997 大韓機械學會論文集A Vol.21 No.9
This study presents a genetic algorithm-based method for optimizing control parameters in fluid power systems. Genetic algorithms are general-purpose optimization methods based on natural evolution and genetics. A genetic algorithm seeks control parameters maximizing a measure that evaluates system performance. Five control gains of the PID-PD cascade controller fr an electrohydraulic speed control system with a variable displacement hydraulic motor are optimized using a genetic algorithm in the experiment. Optimized gains are confirmed by inspecting the fitness distribution which represents system performance in gain spaces. It is shown that optimization of the five gains by manual tuning should be a task of great difficulty and that a genetic algorithm is an efficient scheme giving economy of time and in labor in optimizing control parameters of fluid power systems.
해양플랜트용 Heave Compensator의 진동특성 평가에 관한 연구
황성구(Sung-gu Hwang),김귀남(Gwi-nam Kim),현장환(Jang-hwan Hyeon),정용길(Yong-gil Jung),허선철(Sun-chul Huh) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.5
Offshore heave compensator is a structure that bears dynamic load (environmental load) such as ocean wave and wind, and influenced by vibration during operation. However, While the natural frequency of the structure is close to the dynamic load frequency, it can load to resonance phenomena. This study is composed of 3 model (upper position, middle position, lower position) depend on positions of crown block to vibrate characteristic of offshore heave compensator. Modal analysis and harmonic analysis fulfill vibration characteristic evaluation of finite element model by ANSYS Workbench V13, to judge stability of the structure.
정상혁(Sang-Hyeok Jeong),고동신(Dong-Sin Ko),김원배(Won-Bae Kim),허덕재(Deok-Jae Heo),최재석(Jae-Seok Choi),현장환(Jang-Hwan Hyeon) 대한설비공학회 2011 대한설비공학회 학술발표대회논문집 Vol.2011 No.7
This paper describe develope of analog accelerometer with CAE analysis. In this paper, sensors case was constructed that was fixed on the vertical axis. and the case design and adjustment were based on the CAE analysis for performance improvements. most MEMS accelerometer chip is detected accelerations on the horizontal axis. but general CMS application need to detect vertical accelerations. this paper develope vertical sensing accelerometer that has resonent frequency of about 18kHz and sensitivity of about 120mV/g.