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임윤식,정제욱,안두수 成均館大學校 科學技術硏究所 1997 論文集 Vol.48 No.2
The purpose of this paper is to indicate how the available thoery of optimal control and estimation for the so called linear-quadratic-Gaussian(LQG) problem provides such a unified design procedure for the nonlinear system. In particular, we wish to stress the advantages of this method from the viewpoint of ease of computation, since the theory provides us with equation that can be readily solved by modern digital computers. This algorithm minimizes the effect for the initial error by adaptive analysis method via BPF and the each sampling interval of the nonlinear system is linearized using BPF's coefficients, the convergence of the estimated states can be improved.
임윤식,이명규,안두수 成均館大學校 科學技術硏究所 1997 論文集 Vol.48 No.1
The orthogonal function has been widely employed to solve the control problems, whereas its application to solve the LQG prroblem has hardely been used. Chang & Lee suggested direct application of orthogonal function to Riccatti equation and covariance matrix Riccatti equation. But in this method, the dimension of the integration operational matrix enlarge as the order of the system or the number of expansion term increases. In this paper, in order to solving Riccatti equation and covariance matrix Riccatti equation, TPBVP and matrix fraction method are used. LQG controller is designed by applying block pulse function to this method.
임윤식,안비오,안두수 成均館大學校 科學技術硏究所 1996 論文集 Vol.47 No.1
This paper presents a method to design Kalman filter on continuous stochastic dynamical systems via BPF(block pulse functions). When we design Kalman filter , minimum error variance matrix is appeared as a form of nonlinear matrix differential equations. Such equations are very difficult to obtain the solutions. Therefore, in this paper, we simply obtain the solutions of nonlinear matrix differential equations from recursive algebraic equations using BPF. We believe that the presented method is very attractive and proper to the states estimation on continuous stochastic dynamical systems
임윤식(Yun-Sik Lim),최일윤(Il-Yoon Choi) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.10
Vehicle dynamic behavior should be investigated to establish the track irregularity criteria because they have an impact on vehicle dynamic behavior. The tilting train which have been developed in Korea will be operated on the conventional line. Therefore it should be checked that the track irregularity criteria of conventional line is still available for the new vehicle. In this paper the influence of alignment on running behavior and safety for tilting train was instigated by numerical analysis. The wavelength and amplitude of alignment were considered in scenario of this numerical analysis. This research is based on just numerical analysis and the final result which include measurement will be published in the future.