Advanced Materials Research Vols. 466-467

Abstract: In order to meet the development and test demands of the body control module, the simulation testing system of the automobile Body Control Module was designed with the Hardware-in-the-loop simulation technology. Based on the function of BCM, the key technology of modeling and simulation, interface design and automation testing were explained to implement real-time simulation and testing for BCM. It assure the development quality, shorten the design period and reduce the product cost.

Abstract: This paper aims at improving the robustness of the PMSM position control system with the parameter variation and load disturbance. A novel control strategy utilizing sliding mode model-following control (SMMFC) with the adaptive parameters observed by dual unscented Kalman filter (DUKF) observer is proposed. The switching gain of sliding mode is designed including the observed states of the system to suppress the chattering. The experimental results show that the robustness has been improved by sliding mode control, and the chattering has been well suppressed by switching gain adaptation depending on the observed states of the system. Meanwhile, the control accuracy has been enhanced by model-following control with parameter adaptation. The position control performance of PMSM has been improved by the proposed scheme.

Abstract: The Optimal trajectory design for hypersonic cruise missile is an optimal control problem with strict terminal constraints and variable final time. The classical algorithms always encounter the problems of high sensitivity to initial guess and local convergence in solving this problem. Aiming at these problems, genetic algorithm (GA) which is of good global convergence is applied to designing the optimal trajectory for hypersonic cruise missile. In order to improve the convergence rate of GA and overcome its premature problems, this text introduces a predatory search (PS) strategy to speed the convergence of genetic algorithms, robust and closer to the optimal solution. This text compares the original genetic algorithm (GA) and improved genetic algorithm by the emulate experiments, and the results show that the PSGA is a more effective method to design the Optimal trajectory for hypersonic cruise missile than the original genetic algorithm.

Abstract: In this paper, a common infrared remote control transmitter is designed, using which, a variety of infrared remote control signal can be decoded, stored and transmitted when users need. And with this design, the problem that remote controllers can not be universally operated is solved . In the design, the algorithm of pattern clustering is used to reduce the errors caused by the instability of clock signal. Moreover, the method of vector Quantization coding and repetitive pattern recognition is used to compress he remote control signal data which achieve a good decoding efficiency and a storage efficiency. Experiments show that the design is feasible and has a good prospect in application.

Abstract: A numerical investigation is presented of the structure of a displacement ventilation convection by using the Reynolds averaged Navier-Stokes equation and K-ε turbulence model. Numerical results are reported for the effect of Gr/Re2 on structure of indoor air convection and ventilation efficiency. The results show that the structure of indoor air convection changes from mechanical ventilation to natural ventilation, and the curves of ventilation efficiency are like “M” with Gr/Re2 increasing.

Abstract: Air brake systems have been widely used in heavy trucks and intercity buses for its great superiority over other brake system. In traditional, many researchers focused on the vehicle dynamics which employ the static characteristic of brake system to analysis the vehicle brake capacity. In fact, the practical performance of air brake system may be greatly different from the static theory. Thus, it is necessary to build an integrate air brake system model to simulate the process of brake accurately. Also, some works focused on the dynamic characteristics of brake system have been completed, but it is not comprehensive without the considering the effect of vehicle dynamics. In this paper, a completely air brake system dynamic model is built, where the air brake system contains pneumatic subsystem and mechanical subsystem. The air brake system is embedded in a heavy truck dynamic model which contains three axles. The simulation results show the brake distance, vehicle velocity, vehicle deceleration, and brake torque for each wheel in the process of brake.

Abstract: The methods of self-tuning PID parameters are widely used in industry process control. This paper elaborated the principle and design of internal model control, and it is used for PID parameters self-tuning. By simulation, for a time-delay inertial system, the step response curses are obtained with different methods of self-tuning PID parameters. Compared and analyzed the curses, it shows that the present method of self-tuning IMC-PID parameters has a good performance in the time-delay inertial system. It has great potential for practical applications.

Abstract: This paper presents passivity-based control of voltage source PWM rectifier based on voltage space vector synthesis. According to the power circuit of voltage source PWM rectifier, port controlled Hamilton dissipation (PCHD) model of this rectifier is established. Based on the PCHD model, passivity based controller can be derived. The controller is realized by modulation of synthetic space vectors .The passivity based controller can improve the system response speed and stability more effectively. The simulation results verify the feasibility of the proposed controller.

Abstract: In this paper, a composite T-tail model is developed, including structural finite element model and aeroelastic model, and then structural optimization and aeroelastic analysis are made. Through two steps of structural optimization, and aeroelastic analysis, some valuable conclusions are achieved, which are useful for future composite T-tail design.

Abstract: A PWM drive card is designed aiming at a certain type of DC torque motor used in the speed turntable. A fuzzy immune-PID control method is used instead of the traditional PID method, in order to modulate the PWM waves, and then realize the control for servo¬¬¬ system of torque motor. The simulation results show that, compared with the traditional PID method, the responding time is greatly reduced by using the fuzzy immune-PID control method. And the system gets good anti-interference ability, of which dynamic and steady performances are also improved.