Applied Mechanics and Materials Vols. 325-326

Abstract: Two typical methods for model reference adaptive control are introduced. By integrating the Narendra adaptive control method and the variable structure model reference adaptive control method, a new variable model reference adaptive recursive control method is presented. The results of simulation computations show that the new method has the merits of the above two methods and is efficient and effective.

Abstract: According to the requirements of IEC61131-3 standard, the system of Programmable Logic Controller (PLC) using Sequential Function Chart (SFC) as the main programming language is build. Aiming at the requirements of the SFC programming system, the framework of SFC is established, on this basis, a suit of data structure based on Object-Oriented thinking is designed. It describes the data structure of SFC mainly, and in this way, the functions of SFC, including edit, modify and compile, etc, are realized.The syntax check and logic check of SFC are achieved by traveling recursively and iterating the layers of the nested data structure of SFC. After making SFC into intermediate code, eventually the intermediate code is translated into the corresponding object code.

Abstract: A new control structure based on dynamic inversion (DI) and neural network technology for a class of nonlinear uncertain system is proposed. DI is an effective nonlinear tracking and decoupling control method. However, the performance of the current DI may significantly degrade when internal unmodeled dynamics and external disturbances exist. In this paper, a Cerebellar Model Articulation Controller (CMAC) neural network is used to improve overall system performance of robust tracking control. The algorithm convergence condition is shown. Based on Lyapunov stability theory, all signals are proved to be uniform convergence. Finally, the flight control system of the hypersonic vehicle is designed based on the proposed method and the simulation results demonstrate the excellent performance and robustness of the controllers.

Abstract: The article made a research on the CJT1-10 AC Contactor, established its three-dimensional model in SolidWorks software, using Bottom-Up and Top-Down design method, and virtually simulated the assembly, disassembly and electrical control process in 3DVIA Composer software. A dedicated virtual simulation platform for AC Contactor was developed, and the simulation process was controlled individually by the program code. The virtual simulation platform effectively reproduced the assembly-disassembly and electrical control process of AC Contactor, which provided a good technical documentation for the production practice and teaching application.

Abstract: This paper studies the load frequency control (LFC) problem for hybrid power system (HPS) with renewable energy technology. The goal is to attenuate the frequency deviation due to changing load demand, fluctuating wind and varying solar radiation. Two typical HPSs are considered in the paper: one with abundant wind energy and the other with solar energy. Active disturbance rejection control (ADRC) method is used to design the load frequency controller. Simulation results show that ADRC provides higher reliability and stability for the studied HPSs than conventional PI control.

Abstract: This paper develops a control device for distribution transformer neutral current and loss caused by unbalanced loads. Due to multi-objective optimization, its control strategy is designed, considering the reliable operation of distribution transformers and its performance. This device can gather power quality parameters, calculate the optimal regulation and control capacitor switching, which consists of power quality acquisition unit, central processing unit (CPU), capacitor control cabinet and power supply. After simulation and experiment, the result shows device can achieve target by dynamic adjustment.

Abstract: nherently nonlinear systems may not be stabilized, even locally by any smooth feedback but continuously stabilizable. This paper studies the design of continuous state feedback controllers for a class of singular high order non-linear systems. A systematic design method which combines backstepping theory with the idea of adding a power integrator is presented for globally stabilizing controllers of this class of systems.

Abstract: Combined wireless sensor network technology (WSN) and infrared control technology this paper designs an intelligent control system for split air conditioner (ACSS). The system adopts the SimpliciTI protocol and a highly integrated chipset, CC1110, as wireless sensing node, which it has high efficiency and lower power. The intelligent remote control unit of the system is capable of signal conversion, wireless communication as well as infrared control ability. In order to suit different air conditioners, the system establishes a control code library by learning a variety of air-conditioning infrared control signals. The control parameters optimized by the system server are transmitted to the intelligent terminal and then fires the infrared control signal to the air conditioner. Therefore, the system achieves the purpose of the remote intelligent controlling.

Abstract: This paper presents a method to tune the PID parameters of controller for proportional directional valve without modeling and priori knowledge of the system. The optimization of the PID parameters is achieved through statistic analysis by using the proposed method. The principle and the implement of the method is explicitly introduced first. Then, the experiment is executed, and Ziegler-Nichols method is also applied in PID tuning for comparison. The results show that the presented method performs better and is proved to be effective. And the method is also straightforward to carry out.

Abstract: The unfragile passive control problem of a class of uncertain state-delay sampling system is discussed. Applying Lyapunov method, and combining the properties of matrix inequality, the sufficient condition of robust stability is given, and the unfragile passive controller is designed. Finally a numerical example illustrates the effectiveness and the availability for the design. Index Terms - Uncertain State-delay Sampling System , Linear Matrix Inequility , Unfragile Passive Control .