Game-based Control of Strongly Coupled System for Flexible Landing on Small Celestial Body
To deal with the strong nonlinear attitude-orbit coupling control problem of a flexible lander,a multi-thruster game-based control method is proposed.This method achieves integrated control of attitude and trajectory motion by coordinating the control inputs of multiple thrusters.Firstly,the control strategies interaction of multi-thrusters is realized based on the differential game framework.This framework introduces dynamic prediction information of the system in cooperative control law design,thereby avoiding conflicts and redundancies in multi-thruster control.Therefore,both the overall attitude-orbit performance of the flexible lander and the control energy of each thruster are improved.Secondly,based on sequential approximation and quasi-linearization techniques,a successive approximation-based parameter search algorithm is designed.This algorithm yields closed-form game-based feedback control laws in the presence of strong coupling nonlinearity.As a result,control commands can be autonomously computed onboard.Finally,using a landing scenario on asteroid 433 Eros,the effectiveness of game-based control is validated through numerical simulation.
Small celestial body landingFlexible landerStrongly coupled systemIntegrated attitude-orbit controlDifferential game
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