학위논문 (석사)-- 서울대학교 대학원 : 기계항공공학부, 2014. 2. 이동준. ; We present a novel cooperative grasping control framework for multiple kine- matic nonholonomic mobile manipulators. Our control framework enables mul- tiple mobile manipulators to drive the grasped object with velocity commands, while rigidly maintaining the grasping shape with no dedicated grasp-enforcing xtures. And also, obstacle avoidance framework either via their whole formation maneuver or internal formation reconguration is proposed. For this, nonholo- nomic passive decomposition [1, 2] is utilized to split the robots' motion into the three aspects (i.e., grasping shape ; grasped object maneuver ; internal motions) so that we can control these aspects simultaneously and separately. Peculiar dy- namics of the internal motions is exploited to achieve obstacle avoidance via the formation reconguration. Simulations are performed to support the theory. ; List of Figures iv Abbreviations vi Symbols vii 1 Introduction 1 1.1 Motivation and Objectives 1 1.2 Relevant Works 3 2 System Description 6 2.1 System Model 6 2.2 Grasping Map h(q) 9 3 Nonholonomic Passive Decomposition 12 3.1 Nonholonomic passive decomposition 12 3.1.1 Shape Distribution 14 3.1.2 Quotient Distribution 15 3.1.3 Locked Distribution 15 3.1.4 Properties of Modes 16 3.2 Grasping Control 23 4 Obstacle Avoidance 25 4.1 Obstacle Avoidance Control Design 25 4.1.1 Obstacle Avoidance via Whole Formation Control 26 4.1.2 Obstacle Avoidance via Internal Motion 29 4.1.3 Avoidance Feasibility 33 5 Conclusion and Future Work 38 5.1 Conclusion 38 5.2 Future Work 39 Bibliography 39 Acknowledgements 45 ; Master


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    Title :

    Cooperative Grasping Control of Multiple Nonholonomic Mobile Manipulators with Obstacle Avoidance



    Publication date :

    2014-01-01


    Type of media :

    Theses


    Type of material :

    Electronic Resource


    Language :

    English



    Classification :

    DDC:    629



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