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The behavior of nonlinearity and time-varying cause the pneumatic actuator systems are difficult to be controlled. This paper proposes a Fourier series-based adaptive sliding-mode controller for nonlinear pneumatic servo systems. The Fourier series-based functional approximation technique can approximate an unknown function, thus bypassing the model-based prerequisite. The learning laws for the coefficients...
A method of global PID adaptive fuzzy sliding-mode control for tracking control of multi-link robot manipulators is introduced. The method adjusts switching gain of sliding mode control by fuzzy control, uses fuzzy rules to adjust parameters on line and estimates supper boundary of the mode errors and disturb by integral automatically. So it reduces chattering and enhances precision. Simulation results...
As an important driver element, the pneumatic artificial muscle (PAM) is widely used in industrial applications for many automation purposes thanks to their variety of advantages. The design of a stable robust position controller for PAM is difficult since it is a very nonlinear time-variant controlled plant because of the compressibility of air, air mass flow rate through the valve, etc. The main...
In the face of large scale parametric uncertainties, the existing single model (SM)-based sliding mode control (SMC) demands high controller gains to achieve good transient tracking performance. The main practical problem of having high-gains based design is that it amplifies the input and output disturbance as well as excites hidden unmodeled dynamics causing high-frequency switching and infinitely...
In this paper modeling and robust sliding mode control of a snake-like robot in tracking of serpenoidal motion is addressed. By considering holonomic constraints, the kinematic and dynamic equations of a hyper redundant robot are obtained using Kane's method. The Coulomb friction between robot's wheels and the ground is modeled in two perpendicular directions (i.e. tangential and normal directions)...
This paper presents the problem of trajectory tracking control for the nonholonomic six-wheeled mobile robot. Based on backstepping control algorithm, a switch function for quasi-sliding mode control is designed and a quasi-sliding mode controller with global asymptotically stability is proposed for the kinematic model. This method simplifies the controller design and is applicable to the trajectory...
In this paper, we propose two controllers which extend the original PD+I fuzzy logic controller to treat the plant with time varying nonlinear dynamics. The adaptation ability of the first self tuning PD+I fuzzy logic controller (STPD+I_31) is obtained by adjusting the output scaling factor automatically thereby contributing to significant improvement in performance. Second proposed controller (STPD+I_9)...
In this article, we propose the use of a Sigma - Delta modulation approach combined with an appropriate dualization of generalized proportional integral (GPI) control strategies for the design of observers undergoing switched output injections, as in remote state estimation cases. The class of switched injection sliding observers inherit their robustness with respect to un-modeled perturbation inputs...
The following topics are dealt with: control systems; nonlinear systems; discrete systems; feedback; control theory; path planning; remotely operated vehicles; linear systems; variable structure systems; stability; robots; time-varying systems; neural nets; identification; game theory; telecontrol; mathematical programming; aerodynamics; linear matrix inequalities; and mechatronics
A switched stiffness semi-active vibration attenuation method implemented with a simple relay-type control logic for flexible mechanical structures is presented. A single degree of freedom system is considered for validation of the switched stiffness concept. The method is then applied to a flexible beam with moving base, representing the last link of a Cartesian-type robot manipulator. A piezoelectric...
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