Applied Mechanics and Materials Vols. 303-306

Abstract: Fruit grading is very important for promoting its additional value. We graded oranges based on its images. Four photos were taken from different view angles for each orange. Both RGB and HSI color model were utilized. We extracted a 28-dimensional feature which can describe the size and color of them. Then support vector machine was used to grade these oranges into four levels. Experimental result shows SVM has promising performance for orange grading.

Abstract: A kind of control system of killing oxygen by adding aluminum process is described in this thesis. The prediction model Alcan amount is the core of the process. In this system, the signal separation and the rolling optimization method based on observational data sequence given oxygen Alcan hybrid model for online. The practical application has achieved good results

Abstract: The grid-connected inverter plays an important role in the photovoltaic power generation systems, the output of the grid current harmonics affect the stability of the grid. The reason of grid inverter output current distortion, a detailed analysis of current waveform control strategy and its effectiveness of the grid-connected inverter harmonic current suppression is introduced based on the d-q coordinates in this paper.

Abstract: Considering the shortcomings of close car E/E control system, through the analysis of the open system requirements and characteristics of the car E/E control system, an open system structure of the automotive electronic control system based on quantum framework established/E adopts advanced software technology of embedded system. The electronic control clutch design experiments show that the system can get open role use style of the building and system based on this architecture more than a closed system.

Abstract: Based on the nonlinear of the photovoltaic device output power and the frequent changes in the work environment, a fuzzy controller with genetic algorithm was applied to maximum power point tracking (MPPT) of photovoltaic generation system. The problem of difference in the different interval of the maximum point was solved. It ensure that the system has a higher accuracy .By comparing the method of the fuzzy control and the method of fuzzy control with genetic algorithm through simulation , the result demonstrates the better control effect.

Abstract: In order to study the whole system performance of dynamic positioning ship, a simulation platform which contains environment and ship model, as well as basic guidance, navigation and control functions is established. Besides the ordinary ship and environment modeling, a guidance method for waypoint following is designed by using path interpolation and circle of acceptance. A sensor-fusion based federated filter is proposed to deal with the problem of state estimation and wave filtering. To make the whole system becomes a closed loop feedback system, a PID method are applied to deal with the control problem. By using this simulation platform, this paper simulates and studies the basic functions of a typical dynamic positioning ship. Finally, the simulation proves the validity and excellent performance of this dynamic position ship simulation platform.

Abstract: An automatic watering controller with AT89S52 single-chip microcomputer was developed. According to the moisture condition detected by soil moisture sensor, the system could control the watering quantity by using fuzzy control rules to limit opening and closing time of electromagnetic valve of the irrigation system. Mamdani inference algorithm was employed as fuzzy control model for this closed-loop control system. Soil moisture sensor was put into the substrate for roots growth to obtain moisture information and used as the input. By comparing the water needed for plant growth, water demand and the electromagnetic valve opening and closing time was determined by the single-chip microcomputer program. Centroid method of defuzzification was used to determine the quantitative level of watering quantity. This fuzzy controller was designed by MATLAB fuzzy logic toolbox. The control system was simulated by Simulink. Simulation results show that this control method has good stability.

Abstract: The paper proposes a new method based on the Viere theorem to decide the range containing the optimal parameters. The method can accelerate the parameters search speed on the computer and avoid some unnecessary job for PID controller design. It can be acted as a criterion to judge the stability of the closed loop system.

Abstract: Based on the speed control system of grid connected direct-drive wind permanent magnet synchronous generators, it is proposed and built up that boost chopper generating equivalent as the model of DC generator. Analyzing the dynamic process of the boost chopper generating equivalent as DC generator, it reveals the relationships between intrinsic variables and puts forward that increasing boost chopper control duty ratio D, namely, increasing the energy storage time of inductance L, and reducing released energy time relatively, it will increase the armature current of the generator, otherwise, it will reduce the current in the current continuous situation. At the same time, according to the principle of maximal wind energy tracking, the paper reveals the control mechanism of maximum wind power tracking of the wind generators. A theoretical basis is provided for the realization of the control of the wind power maximum wind energy tracking.

Abstract: Using the easily measured stator current and voltage information of asynchronous motor to get Motor speed by the Model reference adaptive algorithm. MRAS simulation model is builded with the PSIM, thus for system control. Through simulation and experiment in the different frequency and speed condition, contrasted the given speed, actual speed, estimation speed, it shows that the method has good speed identification precision and dynamic performance.