Advanced Materials Research Vols. 466-467

Abstract: Aiming at high speed and accuracy position control, this paper introduces design of an optimal internal mode control and sliding mode control for rocket launcher servo systems which have large varied moment of inertia, strong impact moment and load moment. Internal mode control designed by LQR theory can satisfy system requirement of the position loop in PMSM system. Sliding mode control can restrain effects that caused by model parameter perturbation and external disturbance and realize high performance position control. Simulation results show that the control method is simple and has better performances compared with PID controller.

Abstract: Pure Electric Vehicles (PEV) is an important research direction to solve the problems of auto environment and energy sources. Research double close-loop control system of PEV driven by Brushless Direct Current Motor (BLDCM) has the practical value. Traditional PID controllers have some advantages of being simple, reliable and effective for linear systems, but not for time-varying systems or highly non-linear systems. In order to improve the performances in both steady state and transient state of control system, an Adaptive Fuzzy PID Controller (AFPIDC) can be employed. The dynamic model of PEV and the mathematic model of BLDCM can be analyzed and established. Simulation model of Speed and Current Double Close-Loop Control System are implemented by Matlab7.0/simulink. The simulation results show that the system has rapid response, without static error and overshoot, good performance and strong robustness, high capacity of resisting disturbance.

Abstract: Space Vector Pulse Width Modulation (SVPWM) technique is one of the best method of PWM variable frequency drive and make the AC motor achieving the performance as good as DC motor. Permanent Magnet Synchronous Motor (PMSM) has many advantages of small volume, steady operation, high energy efficiency, large output torque, etc. To solve the problems of auto environment and energy sources, study on Pure Electric Vehicles (PEV) driven by PMSM based on SVPWM is an important research direction and has the practical value. On the basis of analyzing the basic models of SVPWM, PMSM and PEV, simulation model of PMSM Control System for PEV can be constructed. The results of the simulation show that the control system has super performance and meet the request of system.

Abstract: An precise measurement algorithm based on machine is presented, first, salt and pepper noise has been pushed into original image, then the image with noise was under a median filtering，output image is well preprocessed, and distortion in image has been corrected by Camera Distortion Correction. The corrected image was detected by Canny operator on its edge then the image’s edge was extracted by the maximum variance method on certain threshold, and the output image is showed in gray level, then the gray level was under interpolation computation by bilinear interpolation function to make its edge be detected at sub-pixel level. In this paper, the combination of image procession and camera calibration is practically and effectively fulfilled the precision requirement of the system.

Abstract: The paper proposes a method to design AANN dynamic inversion controller through online ANN compensating inversion error. It mainly aims at evident shortage of dynamic inversion controller of UAV. A single hidden layer ANN structure is constructed and the stability of the whole closed loop system is proved. Also the stable adjustment arithmetic of online ANN weight is proposed. The robustness, the adaptability to fault and the response capability to actuator delay time of the scheme are verified by simulation. It is also proved that the online ANN has improved the performance of dynamic inversion controller well. It has important reference value for designing advanced flight control systems of UAV.

Abstract: On the basis of the acceleration measurement of high impact, a high-g acceleration sensors of the piezoresistive beam - island structure at four-terminal all fixed supported was designed. Its structure was analyzed. The reasonable structure parameters were chose. And the parameter simulation and modal analysis were completed with ANSYS software. The results show that the sensor can resist 200,000 g overload and meet high impact test requirements.

Abstract: Based on electromechanical system dynamics model of 3-axis NC positioned, together with the general nonlinear decoupling control theory, the decoupling control method of NC 3-axis positioned is proposed in this paper. In order to control each axis and the simulation of the decoupling control, the Simulink platform of MATLAB soft is used to build a electromechanical system simulation model for NC positioned. The results show that the proposed nonlinear decoupling feedback control method is effective and applicable.

Abstract: Real-time model is one of the key elements in Hardware In Loop (HIL) simulations. A new Crush Natural Gas (CNG) Turbo Engine model and HIL simulation platform are presented in this paper. The platform provides simulations of engine speed, torque, dynamic load, turbo, exhaust gas temperature and emissions conditions. The platform is based on Matlab/Simulink, Labview and can be seamlessly connected with a CNG engine control unit (ECU). Simulation results indicate that platform provide us higher development efficiency as well as lower reduce development expense of ECU.

Abstract: By force analysis of load limiter, the nonlinear relation between the load and the force of sensor in indirect measurement of tower crane load is indicated. Using the force of sensor as input and the load as output, the nonlinear correction model based on functional link neural network (FLNN) is proposed to eliminate the nonlinear errors of load measurement. By adding some high-order terms, the model uses the single-layer network to realize the network supervised learning. The approach can improve network learning speed and simplify the network structure, and provides a new way for On-line measurement of tower crane load. The system realization and network simulation about tower crane QTZ63 are presented, Practical application shows that the maximum relative error of measured load is less than 2.1% and can satisfy National standard GB5144-94.

Abstract: Aiming at the many categories, components, coupling systems and test items of helicopter autopilot, and there are many primary separation components for testing equipments. So the indicator lights of testing equipments and the operating rules are complex, and it easily causes error operation, low testing efficiency, bad stability and so on. It holds up the quick action of helicopter and restricts engineering maintenance support seriously. The test equipments in existence are relatively old, VXI bus technique is applied to design the integrated intelligent test system of helicopter autopilot. Thus the intelligent test system of helicopter autopilot can automatically test the performance of autopilot automatically quickly and accurately. So it increases work efficiency and alleviates air crew’s work intension. It ensures that helicopter has a quick action.