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The main contribution of this paper is to present a new stability criterion of a kind of uncertain systems with time-varying delay. While the system matrices endure segment uncertainty, we show that there is an extreme criterion for the asymptotic stability of the given systems. Such result make it possible to check several vertex conditions. It is proved that, under our assumption, the interval system...
A lower limbs rehabilitative training robot was designed to improve walking ability of patients who suffer from impairment in locomotion after neurology injuries or aged persons who lack walking capability. The robot was fixed with four omni-directional wheels which can move within any radius in any direction. When the robot is running, some undetected uncertainty disturbances change its running trajectory,...
In order to deal with the control difficulties of the dredger's dynamic positioning system under large disturbances caused by dredging operation, a disturbances compensating dynamic surface control method is proposed to be used in the dredger's dynamic positioning system. Disturbances can be measured and compensated by the adding forces sensors. The proposed robust controller guarantees the semi-globally...
With the help of the Simulink toolbox of MATLAB the dynamic simulation model of PMLSM is built. Then according to the principle of robust controlling and the features of robust H∞ controller. The control system modeling and simulation experiments by use of the Simulink toolbox of MATLAB is designed. and the results show that the controller not only has the good tracking performance for the speed controller,...
The design of the voltage loop and current loop of three-phase high power factor PWM rectifier was introduced, the strategy of dual-mode control that combine fuzzy control to PI regulator is proposed, which use fuzzy controller to obtain quick dynamic response when deviation is in small range and adopt PI regulator to realize no static error when deviation is in long range, improving the control accuracy...
On the basis of robust H∞ control, the output feedback controller is presented for a class of dynamic time-varying delay network systems. The objective of designing robust H∞ controller is to achieve the desired queue size and to guarantee the asymptotic stability of the close-loop. The sufficient condition for the existence of a dynamic output feedback controller is presented via matrix inequalities...
A drive for Brushless DC motor (BLDCM), which is fully based on the adaptive fuzzy controllers, is presented in this paper. One of the fuzzy controllers is used in the speed feedback loop to guarantee the accurate speed control. The other fuzzy controller is used in the current feedback loop to track the current change. The proposed full adaptive fuzzy controllers have the characteristics of robustness,...
This paper presents the use of fuzzy logic control (FLC) of a variable speed induction machine wind generation system. The generation system uses three fuzzy logic controllers (FLC's), first fuzzy logic controller tracks the generator speed with wind velocity to extract maximum power. Second fuzzy logic controller programs the machine flux for light load efficiency improvement. Third fuzzy logic controller...
This paper presents comparison of the time specification performance between two controllers for an inverted pendulum system. The objective is to determine the control strategy that delivers better performance with respect to pendulum's angle and cart's position. The inverted pendulum represents a challenging control problem, which continually moves toward an uncontrolled state. The problem is to...
This paper presents the stability analysis of a class of nonlinear time-varying delay systems with parameter uncertainty, through extended Takagi-Sugeno fuzzy modeling. The delay-dependent stability and robust stability criterions are presented using delay decomposition approach, in terms of linear matrix inequalities (LMIs). The time-varying delay is assumed to be bounded and continuous need not...
Tuning of a pH process is a challenging problem due to the strong on-line non-linearity and extreme sensitivity to disturbances of the process. Hence, a nonlinear control strategy based on sliding mode, which is a standard approach to tackle the parametric and modeling uncertainties of a nonlinear system, is chosen for tuning a pH process. Fuzzy Sliding Mode Control (FSMC) as a robust and intelligent...
In this paper a feedback linearization is presented that addresses the coupling effects between two groups of electromagnetic trains. The module, based on some reasonable assumptions of nonlinear mathematical model, is modeled as a double-electromagnet system. The proposed algorithm in tracking has a satisfying performance in presence of unknown changes in the mass. It also shows robustness against...
Inverted Pendulum is a nonlinear, coupling, variable and naturally unsteady system. In order to control the system, the mathematic model through lag range equation was set up and the LQR Controller was designed in this paper. Last, the author analyzes the control results and obtains superior parameters through simulation. The experimental results show that LQR control is more effective and robust.
Economical and ecological motives are pushing shoreside power supply by power electronics systems for merchant ships as well as for cruise ships. Also, final tests of on-ship power systems and generation are simplified considerably. Fault scenarios on-ship and within the harbour grid and the variability of the parameters of on-ship distribution - each ship is special, and large consumers or generators...
A tension adaptive variable-structure control system was designed for constant tension of electric cable plastic wrapping automatic production process. This system contains two inner loops for current and velocity control using PI regulators; its outer loop is for tension control using model reference adaptive controller. Simulation results indicate that the adaptive variable-structure controller...
The control system of scanning motor is studied. The method to control the scanning motor with a single neuron self-adaptive PID controller to counter the disadvantage of analogue PID controller is discussed. The structure of control system and the method about how to implement the single neuron self-adaptive PID controller is designed. The simulation experiment results show that it not only satisfies...
In this paper, a robust design method of optimization is used in the swing block four-bar linkage design by optimizing the robustness of both the system objective function and constraint functions. Comparing the solution of the traditional optimization and the solution of the robust optimal design, the robust design parameter displays a significant stability in performance when the value of the crank...
For the case of intercepting maneuvering target, A new continuous nonlinear guidance law with robustness is proposed by adopting L2 gian method. The mathematic model was built according to nonlinear kinematics relationship between missile and target whose acceleration as disturbance was introduced. Based on the method of zeroing the rate of line-of-sight angle and zeroing the relative distance, a...
This paper is concerned with the guaranteed cost fault tolerant control of networked control systems with both time-varying network-induces delay and data dropout. Using LMI approach, new criteria are proposed for the networked guaranteed cost controller design. The new criteria are irrelevant to the bound of the derivative of the delay, no constrain is imposed to the matrix structure. A numerical...
To improve the tracking precision, integrated control strategy of Permanent Magnet Linear Synchronous Motor (PMLSM) based on sliding mode control and repetitive control was proposed in this paper. Because PMLSM is easily affected by the periodic thrust fluctuation caused by the end effect, the periodic friction and other aperiodic disturbance during operating. The speed controller and the current...
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