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In this paper, relative position control problem in rendezvous and docking (RVD) is studied. Based on CW equations, its state-space form is deduced and a state feedback robust controller is designed by using H∞ control theory for this problem. Considering spacecraft thruster engines, PWPF modulator is used to modulate continuous signals to pulse sequence to adapt to practical situation...
A novel sub-optimal control algorithm based on fuzzy logic system (FLS) to design continuous sliding mode control (CSMC) for uncertain nonlinear systems is presented. By means of combining a fuzzy logic system into sliding mode control, continuous sliding mode control (SMC) can be designed on the derivative of the control signal. The realization of the controller is easier and more convenient than...
This paper present a synthesized design for asymptotic stable feedback control approach based in Euler-Lagrange passivity properties, hyperbolic trigonometric functions, and the Lyapunov theory (specially second method) for a robot manipulator. Control systems of robot manipulators (tracking trajectory set point) offer many challenges in education where the students must learn robot dynamics and control...
A unique design for an omni-directional platform to be used in conjunction with a robotic arm is presented. The platform differs from other omni-wheel layouts in that its drive axes do not intersect its geometric centre. The platform can be controlled in a local method using a three degree-of-freedom (DOF) joystick interfaced directly with the platform through a microcontroller. A global control method...
Designing smooth and stable trajectories for control of the biped robots is a challenging problem that is the focus of this article. A desired trajectory for the lower body will be designed to alleviate the impacts due to contact with the ground. This is obtained by fitting proper polynomials at appropriate break points. Then, planning the upper body motion is accomplished based on the zero moment...
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