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Due to the technical difficulties related to the practical application of Lyapunov's 2nd or “direct” method in the adaptive control of nonlinear systems as an alternative approach the use of “Robust Fixed Point Transformations (RFPT)” were suggested on the basis of recent researches. Various application possibilities were revealed for the new controller and design for imprecisely and partially modeled...
Working robots may encounter and interact with various objects, whose dynamical characteristics are unknown; linear or nonlinear and their strength of stiffness. The interaction includes such processes as collision of arm with environments, hand gripping of objects, holding human body in medical case etc. These processes consist of free motion before touching the objects, and constrained motion after...
In order to improve the performance of HVDC, using adaptive Fuzzy Self-Tuning PI Controller instead of traditional PI controller in the rectifier sides, take the deviation and its rate of the current in the DC Line as the inputs. Then adjusted On-line PI parameters according to the operation condition, and aimed to make the performance of the system is more superior. The DC circuit fault was simulated...
The heat exchange of distilled water unit is a very complex process.The main steam pressure and temperature are tightly coupled with the pressure of raw water, temperature and flow in the circuit, and show non-linear relationship. There are two important parameters need to be controlled in water production process: conductivity and temperature of distilled water at the exit. This is a typical double...
In this paper the operation of a recently introduced novel version of the popular “Model Reference Adaptive Controller (MRAC)” is compared with that of a simple version of its possible traditional implementations. The “traditional implementations” normally use Lyapunov's 2nd (“direct”) method for adaptive tuning of the controllers' parameters. This method yields global asymptotic stability but its...
Due to the remarkable ecological value, the plateau freshwater lakes of Yunnan play the important supporting roles in the regional economic and social development. The pollution and the ecological degradation of the plateau lakes have become increasingly prominent since 1990s. Consequently, the lake basins are facing serious challenges in the sustainable development. Promoting sustainable development...
In this paper we analyzed the restriction factor of the stack crane speed, and put forward the adaptive control method of variable speed for stacker. Using the method of neural network we established the relationship between the highest permitted speed and carrying weight, carrying height of stacker. Finally we designed the control system of stacker based on neural network. It is improved that this...
Based on the mathematic model of single-phase voltage source inverter, an adaptive control method which can deal with unknown parameters and guarantee stable of the control system is systematically proposed in the paper. According to Lyapunov stability theory, an adaptive state observer is used to estimate variables adopted in the control law. Meanwhile, A 3rd order filter is used to deal with the...
To make an analysis on the output exists oscillation of inverter Fuzzy control system, this paper focuses on the digital signal processor (DSP), brings variable universe into Fuzzy self-tuning PID control structure, and put forward a Fuzzy self-tuning PI double closed loop inverter controller based on variable universe, so as to achieve an online adaptive stretching changes of Fuzzy universe. The...
In order to improve tracking accuracy of the servo system, an adaptive inverse controller with PID feedforward is designed. It is based on the time-delay characteristic of the adaptive inverse control when training. The controller can realize accurately tracking of the servo, so as to meet the working need of the system. Finally, the tracking simulation is carried out on the digital servo experimental...
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,...
Adaptive cruise control (ACC) system is a Driver assistant system, which can provide safe and comfortable driving. Based on the analysis of ACC system, a parameter self-tuning fuzzy-PID algorithm is developed to design the ACC control strategy. According to the traffic condition, the parameters of PID controller are adapted on-line by fuzzy rule. The simulation results show that the parameter self-...
Adaptive control technique is adopted to synchronize two identical non-autonomous systems with unknown parameters in finite time. A virtual unknown parameter is introduced in order to avoid the unknown parameters from appearing in the controllers and parameters update laws. The Duffing equation and a gyrostat system are chosen as the numerical examples to show the validity of the present method.
This paper presents a comparative study of the PSO-technique and the Fuzzy based controller for the improvement of transient stability of Static Synchronous Series Compensator (SSSC). New and efficient configuration of adaptive SSSC controller based on the Fuzzy control is presented. Further, the performance of the Fuzzy based controller is compared with the PSO-technique results. Simulation results...
This paper introduces a new chaotic system. Some basic dynamical properties are studied, such as the equilibria, the Lyapunov exponents and the fractal dimension. Based on these properties, effective feedback controllers are proposed for stabilizing chaos to unstable equilibria. In addition, based on Lyapunov stability theory, sufficient condition for the synchronization has been analyzed theoretically...
In the literatures, most studies mainly concentrate on synchronization of the finite-dimensional chaotic systems, i.e., the chaotic systems without time delay. To overcome this limitation, generalized function projective synchronization (GFPS) of a class of delayed chaotic systems is investigated in this paper. In the GFPS scheme, the drive and response systems are asymptotically synchronized up to...
This paper investigates the anti-synchronization problem of a class of novel chaotic systems with fully unknown parameters based on the adaptive control method. By virtue of the definition of anti-synchronization error signal as the sum of state signals of the drive system and the response system to be synchronized, the synchronization error system is derived. Then, a simple adaptive state feedback...
In this paper, a chemical reaction which was first proposed by Willamowski and Rössler is introduced. In order to improve the effect of chemical reactions, a parameter adaptive method is designed to make the chemical reaction chaotic. This adaptive control method can make the parameters converges to the expected target value and assurance the system convergent under the parameter initial values with...
In this paper a study of the fuzzy logic controller for ZCS Boost converter is presented. The fuzzy logic controller provides an adaptive control for better system performance and it is used for controlling the non-linear processes. FLC is designed to regulate the output voltage of the converter. The converter is modeled and analyzed using Matlab/Simulink software and it was designed in an closed-loop...
In many wireless systems, the energy consumed by the receiver is significantly larger than the energy consumed by transmitter, possibly even by orders of magnitudes. This paper derives an analytical solution to maximize the throughput per unit of available receiver circuit power. Adaptive control of the IP3, to handle the time-varying adjacent channel interference level, can substantially improve...
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