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This paper considers the design of a novel closed- loop trajectory tracking controller for an underactuated robotic airship having 6 degrees of freedom (DOF) and 3 controls, on forward, yaw and pitch motions using two side thrusters. A backstepping methodology is adopted as a design tool, since it is suitable for the cascaded nature of the vehicle dynamics. It also offers design flexibility and robustness...
This paper focuses on the joint space control of mechanical systems with electrohydraulic servos. Using mechanism inverse kinematics, desired Cartesian trajectories yield desired actuator trajectories, which are fed to a novel model-based controller. Rigid body equations of motion and hydraulics dynamics, including friction and servovalve models are employed. The developed feedback controller uses...
This paper presents the motion analysis, design and position control of a novel, low cost, sliding micro-robot, which is actuated by centripetal forces generated by robot mounted vibration micro-motors. A new, two-micromotor design of the platform is presented, that improves system energy efficiency, and further does not necessitate for synchronous actuator operation and robot symmetry. The motion...
In free-floating mode, space manipulator systems have their actuators turned off, and exhibit nonholonomic behavior due to angular momentum conservation. The system is underactuated and a challenging problem is to control both the location of the end effector and the attitude of the base, using manipulator actuators only. Physical limitations, imposed by system's dynamic parameters, are examined....
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