Applied Mechanics and Materials Vols. 423-426

Abstract: In order to identify the force on coupling beam, the study of static-loaded diagnosis based on the EMI and ANN techniques is introduced. The theory of EMI and ANN techniques was introduced. The experimental platform was build. The situation of coupling beam was diagnosed by the different curves. The static-load was diagnosed by the ANN technique subsequently. The experiments show we can through the EMI and ANN techniques to identify the force on coupling beam.

Abstract: The wavelet packet decomposition method was used to two common insects song signal. Frequency decomposition and feature extraction were made, the feature vectors, eigenvalues and the sound quality evaluation parameter vectors were constructed, then the correlation analysis calculation were made between the eigenvalues and the sound quality evaluation parameter vectors. The results show that the correlation coefficients are good, the average correlation coefficients of cricket and grasshopper song signals are 0.8875 and 0.6942, the results of cricket is much better than grasshopper, it proved that the proposed algorithm is more suitable for cricket song signals analysis, a new and effective sound quality evaluation method for typical insect with friction sound mechanism is provided.

Abstract: A wireless video transmission system is put forward in this paper. It is constituted by 3G wireless networks and ARM11. Collecting video data is used by V4L2 technology, and the H.264 video codec is used by S3C6410 processors the MFC module. The video codec is sent to remote monitoring center via 3G wireless network. The System can complete video capture, coding, wireless transmission and decoding, and displaying on the LCD. The experiment show the system can achieve wireless remote monitoring.

Abstract: To set up a data transmission network is vital for Fangcheng ports modernization.This paper analyses the requirements of Fangcheng ports data transmission of logistics equipments.The realization of industrial ethernet technology in the Fangcheng port intelligent monitoring system is introduced. Then the ideal industrial ethernet network topology of Fangcheng port and the data transmission network of Fangcheng ports logistics equipments are designed.

Abstract: First designed the SVG has based on direct-coupled, rated capacity 200kVar, rated voltage of 10kV. Elaborate the system configuration of the main circuit, the selection method of the inverter, the diode rectifying devices DC side capacitor and other devices, and control method. Then carry out MATLAB simulation on the designed SVG to verify the correctness of the direct-coupled SVG hardware circuit; when the load changes, SVG can quickly convert operating mode, compensate reactive current.

Abstract: This coal mine rescue equipment can provide emergency refuge, basic conditions for survival for distress miners in event of a sudden emergency. In accordance with the mining flameproof (and safety) type lithium manganese dioxide primary battery power and other safety technical specification, developed a lithium primary battery management system which uses the 32 bit LPC1758 as its master controller MCU cooperate with C8051F500 as its slave controller MCU.This system can be real-time monitoring of various operation parameters of the battery and it is a system with safety and reliability, high degree of automation, flexible combination and other advantages. This system is able to meet various mine emergency rescue equipment energy demands.

Abstract: RF technology is widely used in wireless communication. Due to the small size, high density and high frequency, RF IC testing based on ATE faces many challenges. This paper took a LNA chip fabricated by a GaAs process as an example, simulated the test circuit and studied two methods of RF impedance matching by using the software of Agilent ADS. The results show that it solves the impedance mismatch of the input and output ports in RF test, providing the theoretical support to the design and production of RF test board.

Abstract: In this paper, thermal performance of RGB white LED packages was optimized by thermal simulation using the Finite Volume method. A Monte Carlo photon simulation method was utilized for the analysis of optical performance of LED in quantitative terms. It was found that the distribution of RGB chips has great effect both on the thermal and optical performance of the RGB white LEDs. The tilted angle, material of the reflection cup, and the shape of encapsulant were found to be the key factors which determine the extraction efficiency of LED package. It is demonstrated that the combination of optical and thermal simulation provides a comprehensive optimization approach for a design of high efficient RGB white LED package.

Abstract: Data transmission networks based on GPRS has become a rapid rising data transmission way with its high reliability, networking convenience, low costs and other advantages. Advanced communications systems also involve a digital data radio communication technique as a promising technology that may bring many benefits to the communication community. This article makes a comprehensive comparison and analysis on the transport mechanism, networking and many other aspects, providing a network promotion scheme from data radio based on GPRS.

Abstract: This paper studied application of fiber-optic and wireless communication technology in remote communication system for transmission line based on CMA and proposed the typical design scheme for different applications. The design of CMA which realized monitoring data centralized and upload had been given. The remote communication system used OPGW communication scheme had been constructed and run well, which has important significance for the construction of transmission line monitoring system.