Applied Mechanics and Materials Vols. 687-691

Abstract: A structure of video surveillance platform has been set up based on TI's TMS320DM368 (the following referred to as DM368).The driver of CMOS image sensor has been designed ,according to the valid image data read and timing requirements in the CMOS image sensor. A Aptina's CMOS image sensor AR0130 has been adopted. Acooriding its clock configuration, the ranks’ timing control, the output resolution and other design requirements, a method based on the scanning of ranks clock to divide the valid image area has been applied to set parameters for achieving the hardware device driver. The results show that the device can be normal work under the drive, and video signal outputs stable.

Abstract: Integration with Internet is the development tendency of industrial control network, and embedded Internet technique is the key of implementation. By analyzing field bus Technology and combining actual demand, the paper proposes dial-up high-density programmable logic device solution of remote embedded measurement and control equipment. For the purpose of implementing reuse of design modules and upgrading requirement, the paper systematically expounds top-down hierarchy design method for implementing functional module division. According to the difference of implementation complexity because of the difference of functions, the paper finally analyzes the characteristics and applications of programmable device, and proposes the improvement direction.

Abstract: the example of three-phase bridge controlled rectifying circuit discussed the method of the utilization of MATLAB SIMULINK on the modeling and simulation of power electronic circuits, and gave the simulation result waveform, verifying the convenience, intuition, high-efficiency, high speed, genuineness and accuracy of this method. This method can also make modeling and simulation on quite complex circuits, power electronic conversion system, and electric drive automatic control system. The systematic modeling is very similar to the design process of the actual system. Users can get the simulation results of the system quickly without programming and the deduction of mathematical models of circuits and systems. The analysis on the simulation results can transform the system structure or modify relevant parameters in order to make the system get the required results and performance, which can greatly accelerate the analysis or design process of the system.

Abstract: This paper analyzes and studies the definition of the voltage transformer secondary load, examines the practical purposes of the measured values of the voltage transformer secondary load, and presents a variety of testing methods to analyze and compare the differences. This paper gives the test methods of the voltage transformer secondary load when the connection of the voltage transformer is the Y / Y in a three-phase three-wire power supply system, filling the blank of this type of test method in the industry. When other units within the industry carry out such work, the conclusions of this paper are available for reference, and the conclusions of this paper can be referred when drafting relevant regulations in the future.

Abstract: This paper presents the design of intelligent substation secondary system which is the method to design units of electricity drawing software as a platform to the primary system and the secondary device ICD grid model file for initial design information. Designers carried out a system model configuration of secondary device, performed a virtual terminal connection to generate visual virtual secondary circuit, network interoperability and functional physical wiring diagram which is used to describe the configuration and structure of the intelligent substation secondary system and SCD file and CID is automatically generated into description files. This method provides a visual means of intelligent substation secondary system design and standardization of substation in favor of system integration work, but also conducive to intelligent substation installation, updating expansion and renovation.

Abstract: Brushless dc motor is widely used in high electric field because of its simple structure, large power density, excellent speed regulating performance, and low noise characteristics. This paper describes a brushless DC motor real-time control system based on FPGA. The DC motor is controlled by PWM model and control model which simple the circuit; Calculating the rate of motor by determining the impulse width of n. hall sensor signal; Adopting the soft-core processor embedded in FPGA process increment PID arithmetic control, improve the system real time performance. Experimental results show that the hardware and software are reasonable, owning very good reliability and real time performance. The control system's hardware circuit was designed and implemented such as FPGA periphery circuit, drive circuit, current detecting circuit and so on. And the control arithmetic of current loop, position loop and speed loop were designed and the closed loop control of control system in hardware was achieved.

Abstract: At present, model-driven development method has been gradually applied in safety-critical avionics software to improve reliability and productivity. Existing ARINC653 annex of the Architecture Analysis & Design Language (AADL) is used to model avionic software based on ARINC653-compatible OS, such as VxWorks653 commercial platform. In this paper, a refined C code generation algorithm is proposed to enable automatically generate VxWorks653-runnable code from the AADL ARINC653 models. Finally, a simplified autopilot system example is as a case study to show the validity of our approch.

Abstract: This article describes a real-time temperature measurement system based on ARM9 and temperature sensor DS18B20. The temperature signal is collected by DS18B20 and converted into 16 bits serial digital signal. Later, ARM9 receives the signal and sends it to the wireless transceiver module PTR2000. PTR2000 sends the received signal to ARM9. At last the signal is transmitted to the LCD for a real-time display, also be sent to the printer for detailed records. Our design proposal is simple and practical.

Abstract: In order to overcome the power measurement error caused by switch leakage of time division multiplier, in this paper, the mechanism of switch leakage of no-beats time division multiplier was analyzed, and switch leak was tested. On the basis of this, power compensation circuit on zero point correction based on voltage feedback and voltage frequency conversion method is designed, subsequently the compensation effect was tested respectively. Test results show that the zero compensation method based on voltage frequency conversion method is better, the zero error decreased to 0.0022%, the accuracy of the power measurement was improved.

Abstract: Accurate assessment of the operational status of transmission line,and the line status timely warning, can protect the stable operation of the transmission line. Not high accuracy assessment for the current state of the transmission line,assessment model of transmission line state based on neural networks and fuzzy logic decisions are put forward,built on online monitoring system, Considering the conductor temperature, angle, tension and other parameters.Using BP neural network convergence line fault membership values, and the output state is line fault probability. Then ,the uncertainty of the state probability output line integrated assessmen through Fuzzy Reasoning.