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Study on Satellite Vibration Control using Adaptive Control Scheme
Oh, Se-Boung,Oh, Choong-Seok,Bang, Hyo-Choong The Korean Society for Aeronautical and Space Scie 2005 International Journal of Aeronautical and Space Sc Vol.6 No.2
Adaptive control methods are studied for the Satellite to isolate vibration in spite of the nonlinear system dynamics and parameter uncertainties of disturbance. First, a centralized control scheme is developed based on the particle swarm optimization(PSO) algorithm and feedback theory to automatically tune controller gains. A simulation study of a 3 degree-of-freedom device was conducted to evaluate the performance of the proposed control scheme. Next, since a centralized control scheme is hard to construct model dynamics and not goad at performance when controller and systems environment are easily changed, a decentralized control scheme is presented to avoid these defects of the centralized control scheme from the point of view of production and maintenance. It is based on the adaptive control methodologies to find PID controller parameters. Experiment studies were conducted to apply the adaptive control scheme and evaluate the performance of the proposed control scheme with those of the conventional control schemes.
Modeling and Simulation of a Launch Vehicle Thrust Vector Control System
Choong-Seok Oh,Byung-Chan Sun,Yong-Kyu Park,Woong-Rae Roh 제어로봇시스템학회 2012 제어로봇시스템학회 국제학술대회 논문집 Vol.2012 No.10
The dynamics associated with the thrust vector control system of the launch vehicle is investigated. The objective of the thrust vector control system is to position the thrust vector to some commanded position. The thrust vector control system is the major source of nonlinearity in the flight control system. The modeling and simulation analysis of the TVC system of a sample engine are presented. Using this modeling method, the preliminary design of TVC system for the 75tf thrust engine is conducted. From the simulation analysis of TVC model for the 75tf thrust engine, the nonlinear response, the stability analysis and the bandwidth of the TVC system are presented.
Payload Fairing Separation Analysis Using Constraint Force Equation
Choong-Seok Oh,Byung-Chan Sun,Yong-Kyu Park,Woong-Rae Roh 제어로봇시스템학회 2010 제어로봇시스템학회 국제학술대회 논문집 Vol.2010 No.10
The dynamics associated with the jettisoning of the payload fairings from the parent launch vehicle is investigated. The separation dynamics of the fairings is derived using the constraint force equation (CFE) methodology. The analysis considers a spring and a hinge type separation system employed to jettison the fairings from the accelerating on-going stage. This study presents the results of determining the minimum permissible relative velocity of separation of the fairing and the spring force magnitude required for the separation velocity. The simulation results of the payload fairing separation dynamics are in good agreement with the results of the industry standard benchmark code. Furthermore, this result will be applied to design the parameter of the payload fairing separation system of Korea space launch vehicle (KSLV)-II.
Sloshing Analysis Using Ground Experimental Apparatus
Choong-Seok Oh,Byung-Chan Sun,Yong-Kyu Park,Woong-Rae Roh 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
The natural frequencies and damping ratio of the liquid in cylindrical tank and cylindrical tank with spherical bottom are studied. The experimental frequencies and damping ratio are in good agreement with the results of the theoretical calculations for various liquid depths. Furthermore, this result will be applied to predict the sloshing parameters for a liquid propellant stage of KSLV-II using ground experimental apparatus.