Applied Mechanics and Materials Vols. 336-338

Abstract: Compared with other traditional energy, the small-scale hydropower which is intermittent energy can not be stored and scheduled. The greater fluctuant of the output power of small-scale hydropower leads to great difficult to the operation of the power system. Most of the existing small-scale hydropower forecasting is considered as the load forecasting factors, and there is not effective forecasting method. This paper establishes an output power forecasting model of the small-scale hydropower based on Projection Pursuit. The simulation results show that the new algorithm has a strong practical application in the small-scale hydropower output power forecasting and the forecast accuracy meets the scheduling requirements.

Abstract: A universal fractional-order controller is proposed to asymptotically stable the unstable equilibrium points and the nonequilibrium points of continuous fractional-order chaos systems. The simple fractional-order controller is obtained based on the stability theorem of nonlinear fractional-order systems. The control scheme is simple and theoretically rigorous. The numerical simulations demonstrate the validity and feasibility of the proposed fractional-order controller.

Abstract: With the continuous development of information technology, as well as sophisticated reconnaissance technology and developed communications network technology, massive data has been brought into battlefield simulation system. Effective management and use of such massive, distributed information in battlefield simulation, thus turn information superiority into decision superiority, has increasingly become a hot research field. To provide decision support for commanders at all levels in the complex battlefield environment, we need to establish a hierarchical battlefield environment model, and to consider the demand of intelligent decision support during the modeling of battlefield. This paper refines the common characteristic of battlefield simulation systems, proposes a battlefield simulation framework based on multi-agent. Intelligent agent was used to model battlefield troops, which brings in decision support into battlefield simulation system. The framework can be implemented with mainstream programming languages. This framework has advantage in simplicity, versatility and scalability.

Abstract: According to the actual need of vehicle anti-rollover, based on the current technology of measuring speed, weighing and measuring turn angle, an anti-rollover control system with differential braking and turn angle limit function for electrical vehicle was researched. The system uses data signal processor (DSP) as the core controller, and includes the speed measuring circuit, the weighing circuit, the steering angle measuring circuit and the steering wheel control circuit. The speed measuring circuit using the orthogonal pulse photoelectric encoder and DSP can realize the acquisition and calculation of speed. The weighing circuit with capacitance sensor can convert the load of vehicle axle to the voltage signal. A/D conversion is completed by DSP, and the vehicle load is calculated with V-M mathematic model. The turn angle measuring circuit is composed of the photoelectric angle sensor, the filter and DSP' counter. The control program of the system was also designed.

Abstract: In order to estimate the state of charge (SOC) of lithium iron phosphate (LiFePO4) power battery, the state space model that fit for kalman filter to estimate was established on the basis of PNGV equivalent circuit model. In the case that considering the influence factors such as power battery charge and discharge current, environmental temperature and battery state of health, an improved composite SOC estimation algorithm based on extended kalman filter (EKF) algorithm was proposed, this proposed algorithm integrated using EKF algorithm, improved Ah counting method and open circuit voltage method to estimate SOC. The simulation results show that the proposed algorithm can track the change of the power battery SOC effectively, verify the validity of the proposed algorithm.

Abstract: PLC (programmable logic controller) is one type of general industrial control platforms. Based on the PLC of SIMENS S7-200 series, this paper introduces a control scheme of cutting metal plates control system in the flame cutting machine. The hardware design and PLC program are given in details, which achieve accurate position and fixed-length cutting by the stepper motor through the control of PLC. In addition, the configuration simulation of the system is performed by the application of King view software. The control system has multiple operating modes, high reliability, stability and is able to meet the variety of different work requirements. The automatic control of cutting metal plates is achieved. The control system is applied to actual projects and can greatly enhance productivity.

Abstract: Wavelet neural network is used in the direct thrust control system of linear motor in this paper, as wavelet theory has the characteristic of the time frequency location characteristic, the strong approximation and fault-tolerant capability. The observation of flux linkage is improved by accurate identification of primary resistance, and the direct thrust control performance of linear motor is further improved. This paper used wavelet neural network to realize the identification signal of resistance. The simulation results show that the identification system has good effect in primary resistance identification. The direct thrust control system based on resistance identification can efficiently improve the control system performances of linear motor, and offer a novel design opinion for improving the low-speed performances of linear motor.

Abstract: An optimized battery state of charge (SOC) estimation method has been proposed in this paper. The method is based on extended Kalman filter (EKF) and combines Ah counting method and open-circuit voltage (OCV) method. According to the current excitation-response of a battery, the internal parameters of the battery model were identified by the method of least squares. Then the proposed estimation method is verified by experiments. The results show that the estimation method can reduce the cumulative error caused by long discharge and it can estimate the battery SOC effectively and accurately.

Abstract: This paper studies the robust consensus problem for multi-agent systems with nonuniform time-delays and switching topologies in the presence of external disturbances, where each agent has a self-delay and each delay is independent of each other. A neighbor-based rule is used for the agents with nonuniform time-delays and external disturbances. A sufficient condition is derived under which all agents achieve consensus while satisfying desired H_infinity performance. Finally, the effectiveness of the obtained theoretical results is demonstrated through numerical simulations.

Abstract: Due to the vehicle performance improvements, the requirements of active safety technology have been increasing. The quality of brake system became a significant safety factor in commercial vehicles on the roads. This paper aimed at developing a highly integrated single chip controller that allowed real-time sensor data acquisition as well as brake force calculation and distribution. The controller was verified by Matlab/Simulink real-time simulation and hardware-in-loop test.