Applied Mechanics and Materials Vols. 300-301

Abstract: This paper investigates the tracking control problem of high-speed train system. The nonlinearities and uncertainties exist during the train operation are becoming even worse and cannot be ignored or simply linearized anymore as the speed increases. An adaptive control algorithm is developed to improve the tracking performance that does not rely on the accurate model parameters which are impossible to obtain precisely in practice and can deal with the nonlinearities efficiently. Based on the Lyapunov stability theory, the backstepping design method is used to deduce the control law step by step, and the certainty-equivalent principle is employed to dispose the uncertain parameters. Both the rigorous theoretical analysis and simulation results are all verified the effectiveness of this proposed control algorithm.

Abstract: The paper aims the power management of Li-ion battery on the electric vehicle to record motor-using behaviors for each electric vehicle in a cloud server. After retrieving information from each electric vehicle, developed algorithm will be able to conclude a proper charging scheme for each electric car according to their using history. Therefore, optimizing rapid charging scheme become possible, and the cloud information can also assist power grid to manage power flow under crucial circumstances. To do integrated management of batteries, the design starts from setting up LiFePO4 batteries’ charging/discharging characteristic curve under different load. Considering the mobility of battery information access, the work proposes a cloud server work as database and computing center. The more information collected by the cloud, the more precise of the battery-using model is. The database collects data including battery SOC, battery voltage, discharging current, temperature…etc. The battery life simulation also works in the cloud by the information about SOC, open-circuit voltage, discharging current and temperature. According to cloud data analysis, charging current 5C/10C/20C under rapid charging grid’s load monitoring is possible; the process of environmental development and hardware planning can train students to use hardware, firmware and software design platform for the skills development for future employment.

Abstract: For vehicle suspension system with norm-bounded uncertain parameters, this paper presents a robust optimal guaranteed cost controller by the quadratic performance index with cross-weighted terms. This controller is able to make the vehicle suspension system keep stable with the parameter perturbation and ensure optimal performance. Then the energy balance analysis is presented and an energy balance condition is given. The simulation results show the feasibility and effectiveness of the controller algorithm. Meanwhile this controller has better performance than both robust controller designed by Riccati equations and LQG controller.

Abstract: The dual-axial volumetric type bending machine is a coupled system and has significant structural interaction. Fuzzy controllers are widely applied in electro-hydraulic servo control systems. This paper proposes a coupled adaptive self-organizing sliding-mode fuzzy controller (ASOSMFC) to improve its level control performance. Parameters are important factor to the control effect. Experimented results indicate that owing to the unsymmetry of two subsystems of volumetric type bending machine, the adaptation gains of two subsystems must be different, to prevent the system divergent adaptation gains must be positive. Sliding plane gain will influence time response, synchronism and oscillation in steady state.

Abstract: The growing interest shows the importance of the control of chaos in fractional-order systems in recent years. This paper investigates in the hybrid projective synchronization of two chaotic systems with fractional-order, which were derived from Euler equations of rigid body motion. Theoretical analyses of the proposed methods are validated by numerical simulation in the time domain. Moreover, the synchronization system is realized using electronic circuits with fractance in the frequency domain.

Abstract: In order to study the characteristics of the linear motor, this paper constructed the tubular permanent-magnet linear synchronous motor control experiment platform. Firstly, this paper introduces the structure and principle of the TPMLSM. Secondly, metal bracket is made. Magnetic grid scale is used as position sensor. Three closed-loop controller is constructed. Finally, controller make the linear motor to achieve pre-set target through the programming. The linear motor completed the intended target , and shows excellent characteristics.

Abstract: Pipe cooling is a significant measure for temperature control in the construction of concrete dam. In the past, studies concerning pipe control are quite simple, most of which are confined to the theories. They only focus on the positive effect of pipe control in reducing thermal rise, while paying little attention to its negative effects in elevating temperature stress. This paper carries out example verification on programs such as cooling height, distance between pipes, cooling stage, cooling temperature control, etc on the basis of simulation calculation program of the temperature field and thermal stress in the whole process, so as to seek the optimal effect of pipe cooling thus reducing thermal stress and improving the anti-crack reliability of the concrete.

Abstract: In this paper, the robust longitudinal flight control is developed for the fighter using the backstepping technique. To improve the robust control performance for the unknown external disturbance, the sliding mode disturbance observer is employed to estimate the unknown external disturbance. Utilizing the disturbance estimate output, the robust backstepping flight control scheme is proposed for the fighter with the unknown external disturbance. Finally, simulation results are given to show the effectiveness of the proposed robust flight control scheme for longitudinal flight dynamics.

Abstract: The aeroelastic wing model is an underactuated 3 Degrees-of-Freedom (DoF) system in which only a single control signal can be applied. Its model-based control attracted much attention recently. In the present contribution the effects of 20% modeling error in two significant system parameters are investigated in PI and P-type controllers that can be made adaptive by the application of Robust Fixed Point Transformations (RFPT). It is shown that by the use of this simple adaptive technique operating with altogether 4 control parameters precise control of the trailing-edge surface deflection is possible. This statement is substantiated by simulation results.

Abstract: The intelligent control system of electric tracking trolley that uses infrared sensor as sensitive component and AT89S51 microcontroller as control core is designed in this paper. The design employees infrared receiver and transmitter to detect the runway information and AT89S51 to control the electric trolley tracking and auto parking. The system has the characters of simple circuit structure, high reliability, high intelligence and low power consumption. The paper describes the system's hardware and software design flow in detail. The result shows that the smart trolley in the absence of human intervention could independently run and stably track the target.