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지능형 굴삭기의 궤적 추종 오차 개선을 위한 중력 보상 제어기에 대한 연구
이창섭(C. S. Lee),홍대희(D. H. Hong),김태호(T. Kim),김기용(K. Kim),조용락(Y. Cho),장윤석(Y. Jang),장달식(D. Jang),장준현(J. Jang) 유공압건설기계학회 2009 유공압건설기계학회 학술대회논문집 Vol.2009 No.11
One of the most important factors in Intelligent Excavator is to locate the bucket fast and accurate to the right position. To locate the bucket accurately, the Arm and the hydraulic cyliner of the Boom should be exactly controlled. But as voltage and the force that should be controlled can be different by the positioning of the excavator, exact controlling is a difficult task. Only if we could control the gravity and the load, which is the main part in controlling the excavator in a slow system, it can be controlled more accurately. In this paper, we looked on how much the excavator could be controlled with gravity compensation.
광센서를 이용한 차량용 전자동 선바이저의 설계 및 제어
이창섭(C. S. Lee),김동남(D. Kim),홍대희(D. Hong),이상훈(S.-H. Lee) 한국정밀공학회 2006 한국정밀공학회 학술발표대회 논문집 Vol.2006 No.5월
In this paper, automatic sunvisor system is introduced for driver"s safety and convenience. This system has the mechanism which keeps the sun off without obstruction of driver"s sight. The mechanism can make the sunvisor move forward or rotate left while remaining inside inner roof. The control system consists of a CPU, a motor driver, light sensors, and the algorithm that can control the movement of sunvisor efficiently. When the light sensors take the sun light, they give the signal to the CPU and the CPU calculates the best position of the sunvisor with the information of driver"s eyes height. Then, the CPU gives the signal to motors that can move the sunvisor.
수치미분을 이용한 고무의 유한요소 해석시의 수렴성 연구
이창섭(C.S.Lee),홍상표(S.P.Hong),노권택(K.T.Roh),권영두(Y.D.Kwon) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_2
A finite element procedures for the analysis of rubber-like hyperelastic material is developed. The volumetric incompressibility condition of the rubber deformation is included in the formulation by using penalty method. In this paper. The behavior of the rubber deformation is represented by hyperelastic constitutive relations based on a generalized Mooney-Rivlin model and an extended Mooney-Rivlin model.<br/> The principle of virtual work is used to derive nonlinear finite element equation for large displacement problems and presented in total-Lagrangian description. Considerable improvements have been achieved in the solution by the reduced integration method.<br/> The finite element procedure using analytic differentiation resulted in very close solution to the result of the well known commercial packages NISAⅡ and ABAQUS. Numerical tests show that numerical differential method coincides very well with analytic method and the well known commercial packages in static analysis.<br/>