Applied Mechanics and Materials Vols. 313-314

Abstract: A novel architecture of tightly-coupled SINS/ GPS integrated navigation system based on FPGA for target missile is proposed in this paper.The whole system is built on a single single FPGA chip containing a Nios II soft-core processor. In addition, the embedded real-time operating system μC/OS-IIis transplanted to the Nios II processor for managing each module in the system. The system can still provide the high-precision navigation data to integrated control computer of target missile when the number of available satellites is less than 4 by means of processing the pseudorange and pseudorange rate seprately. Therefore, the system has the strong application significance in terms of reducing the route shortcut of target missile.

Abstract: As it is difficult to realize the traveling wave protection principle based on wavelet analysis in microcomputer protection device, a new microcomputer protection architecture based on FPGA+ARM is put forward in this paper This architecture make full use of ARM to complete relay protection principle, communication and the realization of the man-machine interface for the powerful transaction processing ability, and make use of FPGA to complete complex real-time wavelet analysis by a logic circuit for the characteristics of FPGA in high speed real-time parallel computation. It proves in experiment that this scheme is a good solution for the realization of travelling wave protection.

Abstract: In order to achieve long-range assessment of fruit quality, a comprehensive evaluation system for fruit was designed using embedded remote technology. This system was based on platform of ARM+LINUX embedded system. Electronic balance was used to obtain fruit weight, and ZigBee wireless sensor network was designed to collect environment parameters of orchard site. USB camera was controlled up or down and right or left the four directions to obtain extensive video information by rotating base of camera .Then the collected data of real-time were sent to the monitor service center through 3G wireless module. Remote users can browse WEB server of orchard to view real-time picking fruit, weighing scene and related environment information of fruit growth according to their demands. Experiments were made in vineyard. The results showed that the system was able to collect many assessment dates of fruit, and the design requirements could be met in real-time data acquisition and remote transmission. The comprehensive quality of grapes could be evaluated by collected data from the remote browser.

Abstract: With the PTN network gradually becoming the unity ofthe business group transmission network, clock synchronization is an important issue inPacket Transport Networking (PTN). This paper introduces time synchronizationtechnology of IEEE1588v2 based on FPGA and VHDL. It has more flexibilityimplementation than the foreign professional processing chip, and easy toupgrade. It also solved the low accuracy synchronization problem of softwaretimestamp. With the result of the simulation and testing, this implementationis proved to be available for meeting the requirements of communication systemson clock Synchronization.

Abstract: The existing micro current detecting apparatus is of large size and is manual controlled. When the detected currents sensitivity is higher, however, stability will be worse. In order to solve this problem, an adaptive detection system is proposed in this paper. The system designed a micro current signal detection circuit based on OK6410 embedded with development board. The Weak current signal is collected with the high precision ADC. Automatic adjustment circuit gain is from 1 to 10000. Spectrometer wavelength size is changed in real-time. Current resolution can reach nA. The experimental results show that this system can collect the micro current effectively. The main characteristics of the system are simple circuit structure, small volume, high degree of automation, and strong reliability, and it greatly improves the anti-interference performance of the circuit. The system can not only be applied in electrochemical current detection, but also be widely used in weak signal detection.

Abstract: According to the international Micromouse competition requirements suited for the IEEE standard maze, a kind of Micromouse based on C8051F120 is designed in this paper. The hardware structure and software algorithm are specifically introduced, the Center Toward Rule and the Bellman-Ford Algorithm is used for turning, searching and attitude control is optically designed. The designed Micromouse can find the optimal route of the IEEE standard maze by 0.4 s and walk rapidly and stably.

Abstract: Bouc-Wen model is a kind of more representative differential hysteretic model, which has the advantages of strong universality and parameters easily identification and that can better approximate the hysteresis curve. By using nonlinear system dynamics circuit theory, Bouc-Wen mathematical model is transformed into circuit model, the simulation results test the validity of the designed circuit and a physical circuit board is finally made. An experimental setup is established with the data acquisition card and related software. Circuit debugging and signal output under typical excitation of the circuit board are performed, the results show that the circuit board is be feasible to demonstrate the Bouc-Wen model.

Abstract: In this paper, a digital direct current source based on Nios II is studied. The system adopts FPGA as hard core and the main circuit of constant current source consisting of operational amplifier LM358 and power Field Effect Transistor (FET) IRF530. In addition, 12 bit D/A chip MAX531 and 12 bit A/D chip TLC549 are used to monitor the output current. The system outputs current from 20mA to 2000mA with 0.5mA step level, the set current value and actual output current value can be displayed by LCD. Result shows that the system has characteristics of high precision, good stability, small size and high integration.

Abstract: A tire pressure monitoringsystem TPMS was designed, while realized the real-time monitoring vehicle tirepressure, temperature, battery voltage and other functions. TPMS transmittingmodule uses the infineon triad integrated module SP370 design, to achievedetection information, and transmitting to the receiving module by the wirelesstransmission. The receiving module is to accept data and process ofabnormal situation, and through the process of software to design the tyre gasleak detecting method.

Abstract: We expressed the resistance between the origin and any lattice point in an infinite perfect Simple Cubic (i.e., SC) network rationally in terms of the known value of the Lattice Green's Function at the origin (i.e., ), and . On the other hand, we investigated the asymptotic behavior of the resistance. Finally, some numerical results has been calculated.