鉴于柔性传动系统传动过程中张力大小及平稳性对于传动质量具有决定性的影响,结合薄膜涂敷装置的动态过程,建立了张力的数学模型.针对张力控制中强耦合、非线性的特点,以及传统的控制策略需要构建精确数学模型的缺点,采用了一种分区比例控制策略对张力进行控制.仿真结果表明分区比例控制策略能有效地控制张力,系统性能良好.

The objective of this paper is to research on the application of proportional controller based on phase plane division in the tension control system of coating device to improve the quality of tension control. Firstly, the control strategy of proportional controller based on phase plane division and the parameter tuning methods are analyzed. Then the simulation model of tension control system is built with the help of MATLAB SIMULINK. Finally, the simulation results are given. Simulation results indicate that the tension control system is effectively controlled by the proportional controller based on phase plane division.

Proportional control strategy is easily realized, but the system dynamic performance, steady performance and stability are contradictory for proportional control requirement. The proportion control strategy of different partitions of the proportional controller based on phase plane partition affects system performance index. Adjusting the proportional control of the controller based on different phase plane partitions can improve some performance indexes so that overall performance indexes could be improved. The control parameters are discussed about how to affect the stability, steady performance and dynamic performance of system. Finally, the obtaining means of parameter for phase plane division proportional controller is discussed.

Starting current is too large when the motor is started directly. The motor consumes large amounts of reactive power when it is connected to the electrical network. An intelligent controller of magnetic controlled soft starting is developed for reactive compensation. The controller used the 16-bit MSP430F1612 MCU as a control core. An algorithm with measuring phase angle calculated the power factor, active and reactive power, and could realize auto-tracking of reactive compensation and auto-switching of shunt capacitors. The paper put forward hardware structure and software design in detail. Experimental test demonstrates that the control system can dynamically adjust the output of reactive power compensation equipment, and effectively improve the system power factor, and reduce the motor starting current, so as to achieve the protection of the motor and equipment.

The radio frequency identification is a kind of new-type automatic identification technology.It has many characteristics such as being strong reliability,convenient,swift and safe.Aiming at the problems existing in managing the district,the RFID technology is applied in district entrance guard system,which improves the science and the reliability of the system.In this paper,the work principle of the RFID,the structures of the system and its implementation are introduced.

In order to eliminate the harmness of the starting current of the three-phase AC motor,in particular,the middle-voltage and high-voltage motor,the magnetron soft start device is developed based on PLC200.One kind of flexible,simple and effective soft start control method is advanced according to advantages and disadvantages of various control methods used in soft start device.The experiment on the 11 kW wound fan is implemented.The experimental results show that the device can smoothly start motor with multiply protection measures and high reliability.

With the development of electronic technology, the plastic injection molding machine controller which applied a single CPU core in the low-end plastic injection molding machines cannot meet the need. In order to resolve the problems of the current plastic injection molding machine controller, which include big volume, low integration, complexity hardware, low reliability, low price-performance ratio, and unsatisfactory control effect, a high level of integrated fully automatic plastic injection molding machine controller which based on multi-CPU will be researched. Multi-CPU is used for hardware design. The adaptive intelligent control algorithm is applied on software design in order to achieve accurate temperature control. At the same time, the output circuit detection technology is used to make the perfect combination on hardware and software. Practice has proved that the new utility model have improved the reliability and the accuracy of the injection molding machine controller, and the controller have the benefits of high integrated of hardware system, simple structure, high performance-to-price ratio and so on.

PLC is used as a controller for the high-voltage motor magnetic controlled soft starting device generally. A single trigger board is required to produce trigger pulse, and a synchronous transformer is need also. It is the high cost and low reliability of the control device. A new controller of magnetic controlled soft starting for middle-high voltage is developed. Two low-performance CPU is used to improve the processor capacity and reduce hardware cost. Large plate of a circuit board structure was used to reduce the size of the controller. All input and output apply the optical coupler isolation, and output signal was tested cycle for the correctness to improve the reliability.

This paper describes present status of bridge structure monitoring, the significance of bridge health monitoring systems and the components of those systems. Special bridge health monitoring system for Tianxingzhou Bridge is constructed. It is mainly based on fiber grating sensing detection and other supplementary measures. The structure and function of individual subsystems were studied. Moreover, the requirements for normal bridge health monitoring are also in the research. With Brower / Server model, individual subsystems are combined with each other. And a real-time intelligent health monitoring system is built. It is also web-based.

The variable voltage variable frequency system (VVVF for shorten) of the induction motor, in which the Module DSP56 F8346 and IR2136 were applied as core of this control system, was introduced. Also, the hardware frame and software flowchart and their functions were presented .

A brief introduction is given to Genetic Algorithms(GA) and PID control design based on Genetic Algorithms(GA) in this paper.Also the design is simulated under MATLAB/SIMULINK and good control effects are got.

The article analyzed the u-boot's booting sequence,and explained the porting sequence based on S3C2410 developing board.

This paper deals with a kind of constant pressure water supply control system based on both S7-300 PLC and frequency converter.The system structure,functions and working principle are introduced.

In this thesis,the principles and implementations of the induction motor speed-sensorless vector control are discussed.This method has high stability,good market prospects and so on.

The paper introduced structure and design of electric tour bus,including design on electric system and control system and mechanical system,and finished the match calculation of the electric system parameters,offered the test results of the whole bus finally,the results indicated that every performance index of this bus met technology requirement for the Ministry of Science and Technology,and the whole car design was rational.After these cars was putted into the market,they obtained better economic and social benefits.

In this paper,a double-loop vector control system solution based on digital signal processor is offered.And the hardware solution and software solution of the design system are discussed.

Two important questions of automatic fingerprint identification system—the fingerprint image enhancement and the minutia match are researched.The fingerprint image enhancement algorithm in frequency domain is given.A new simpler approach is adopted to calibrate fingerprint image,which uses the preliminary match and the overall optimal match.One of the benefits is obtaining an effective solution to the selection of reference points in the match through lower calculation cost.

In this paper,according to the demand of long-distance monitoring system,it combines embedded and internet technology,and uses B/S mode to achieve it.In this system,nine-point controller is used as the system control policy,and users can visit the web server in other computers of the network and browser the data of the locale,and realize the monitoring aim through the form of intranet visiting the monitoring layout.

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The principle and realization of the active power filter based on DSP are introduced.At the same time,the main circuit and signals detection circuit are also provided.The experimental shows that the system has good dynamic compensation characteristics and has reached the design goals.Also,the harmonic in power system is restrained and the power waves are close to the sine wave.