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반복학습제어와 할바흐 자석 배열 스튜어트 플랫폼을 이용한 차량 진동 신호 재현
고병식(Ko, Byeongsik),강수영(Kang, SooYoung) 한국소음진동공학회 2013 한국소음진동공학회 논문집 Vol.23 No.5
This paper presents the replication of a desired vibration response by iterative learning control (ILC) system for a vibration motion replication actuator. The vibration motion replication actuator has parameter uncertainties including system nonlinearity and joint nonlinearity. Vehicle manufacturers worldwide are increasingly relying on road simulation facilities that put simulated loads and stresses on vehicles and subassemblies in order to reduce development time. Road simulation algorithm is the key point of developing road simulation system. With the rapid progress of digital signal processing technology, more complex control algorithms including iterative learning control can be utilized. In this paper, ILC algorithm was utilized to produce simultaneously the six channels of desired responses using the Stewart platform composed of six linear electro-magnetic actuators with Halbach magnet array. The convergence rate and accuracy showed reasonable results to meet the requirement. It shows that the algorithm is acceptable to replicate multi-channel vibration responses.
열간 프레스 성형공정 적용을 위한 극저탄소강 내 930℃ 탄소확산의 유한요소해석
강수영 ( Soo Young Kang ),고병식 ( Byeong Sik Ko ) 대한금속재료학회(구 대한금속학회) 2013 대한금속·재료학회지 Vol.51 No.9
Abstract: Carbon diffusion of ultra-low carbon steel treated at 930℃ for 10, 30, 60 and 120 minutes is investigated by using optical microscopy, EPMA and Micro Vickers. Results of experiment and finite element analysis are compared. The carbon diffusion seen in the optical microscopy, EPMA and Micro Vickers test increased as the time treated at 930 ℃ increased. Such phenomena is explained by finite element analysis.