Zhang Changfan

Design of sliding mode observer for uncertain nonlinear systems

This paper takes a detailed discussion about a class of nonlinear systems with uncertainty and Lipschitz part. In the particular systems, the nonlinear part satisfies the Lipschitz condition, while the uncertain part is a bounded function. A design of nonlinear sliding mode observer is then developed, with which the system stability is fully proved. Simulation studies are presented to demonstrate the effectiveness of the proposed strategy.

Global Exponential Stability of a Class of Variable Time-Delay Cellular Neural Networks

In view of variable time-delay cellular neural networks with activation function bounded and meeting the conditions of Lippschitz, the result of the global exponential stability is obtained by constructing a special Lyapunov function equality and using Lyapunov function technology and matrix inequality. The global exponential stability of variable time-delay cellular neural networks whose activation function is likewise linear function is discussed. An example and its computer simulation is given to prove the effectiveness of the obtained result. Finally the result of this paper is discussed by comparing existing achievements, and it is with advantage of low dimension validated matrix, simple calculation and easy computer implementation.

Study on Control Strategy of Sliding Mode Variable Structure-based Electronic Virtual Line Shafting

The degree of precision for positioning of adjustable rollers during pre-registering stage has direct influences on register precision of the entire printing. The paper puts forward control strategy of sliding mode variable structure-based electronic virtual line shafting based on the influences of low-speed pre-register process of shaft-less drive printing press on register precision and the influences of nonlinearity and disturbance on synchronous precision of printing process. The experimental results demonstrate that the control strategy proposed by this paper can realize synchronous control of shaft-less drive printing press, and also can inhibit effectively the influences on synchronization of system position due to change of parameters and friction during pre-registering stage.

Realization of PMSM adjustable speed system based on sliding mode control

The PMSM mode is a nonlinear, multi-variable system with strong coupling. The sliding mode variable structure control is advantaged by its rapid response, insensitive to the change and disturbance of the variables, simple arithmetic and easy application, which furnishes a better solution for the complicated industrial control. The PMSM adjustable speed system discussed in this paper employs TMS320F2812 as the master chip, uses the controller of sliding mode variable structure under the exponential reaching law to carry out the control, gives out the position expression and incremental expression and develops the program, which is used as the software of the adjustable speed system, as per the derived arithmetic in the form of incremental type. Finally, the MATLAB simulation and specific experiments prove such system has the advantages like rapid dynamic response, small electromagnetic torque ripple and stable which result in high robustness of the system.

Design of Fuzzy Rule Based Novel Sliding Mode Controller for Buck Converter

This paper presents a fuzzy sliding mode controller for the Buck converter by a novel method, the novel method considers system and designs the controller on the three-dimensional space, and thinks over the dynamic information of all elements in the buck circuit adequately. At the same time, the method adopts the exponent tendency arithmetic to descend chatter, and employs fuzzy theory to improve performance of the controller, the system can arrive the stability state further more quickly. Lastly this controller is applied on the Buck converter by the simulation experiments, and the result is excellent.