Applied Mechanics and Materials Vols. 635-637

Abstract: With wind power technology become more mature, offshore wind power generation system development obtains more attention. However, compared to onshore wind energy, offshore wind suffers harsher environment, and its maintenance become more difficult. Therefore,improves the performance of monitoring system of offshore wind power is essential to reduce operating and maintenance costs. This paper designs offshore wind monitoring system based on ZigBee wireless sensor networks aiming to develop more raliable monitoring system. Meanwhile, this study proposed a smart ZigBee routing strategy IZCT algorithm. OPNET simulator was used to simulate the topological features and performance of ZigBee networks. The test result indicates that IZCT algorithm can optimize the routing path of the wireless sensor networks and improve the reliable of the network communication.

Abstract: Revenue metering is one of the most important profit growth modes in services. This paper study the issue based on the Analytical Hierarchy Process (AHP) analyzes, the results show that the revenue metering constitute indicators of the degree of impact on revenue metering, its from the index layer constituting hotel revenue metering to explore the impact of the implementation of the effect of a short board, to establish a perfect hotel revenue metering system to provide a more reliable basis and achieve the desired results.

Abstract: The characterization of novel portable microfluidic devices, with capillary phenomena as filling process, was presented. Created for monitoring multiplexed chemiluminescence (CL) reactions, the devices are amenable for integration with organic photodiodes (OPDs) for future incorporation in microelectromechanical systems (MEMS). Using finite element method (FEM), four designs of microfluidic chips were simulated. The parallel design, despite its quick total filling time (TFT), presented a non-uniform filling process and a non-compact structure. The series design was the most compact structure studied. However, it cannot be used in CL reactions with multiple analytes in common, which is a major drawback. Regarding the parallel-series, it solved some of the problems presented in previous designs but its high TFT and non-compactness make it a less attractive solution for a portable microfluidic device. Finally, the optimized parallel design proved to be the best design, presenting a quick TFT, high compactness and the capability to have CL reactions sharing analytes.

Abstract: For realizing the dynamic optimization of measuring instrument calibration interval, predicting the history calibration data by modeling. First the improved moving average method is used to modeling and to predict the development trend of parameters. On the basis of this, BP network is used to compensate the predicted residual sequence, so as to get more accurate forecasts. Then improved MA - BP prediction model is given to optimize the calibration interval dynamically. The model is verified through experiments. The results show that the model has higher prediction precision and better universality.

Abstract: In order to ensure power supply reliability and reduce a variety of power supply failure, we analyze the development status, advantages and disadvantages of partial discharge detection techniques about the various Gas -insulated Metal-enclosed Swith Gear (GIS). We put forward the application of ultra high frequency (UHF) technology for GIS partial discharge online monitoring technology methods to solve the problems of the difference of the pulse current method of anti-interference ability and ultrasonic sensitivity the problem of low. According to the deficiency of the traditional ultra high frequency sensor, we developed a new window type of ultra high frequency sensor, and compared with conventional in vitro type UHF sensor. Experimental results show that that the window-type UHF sensor sensitivity and anti-jamming capability are superior to conventional high-frequency sensor

Abstract: Elasto-optic constant is an important parameter for stress measurement by digital gradient sensing method (DGS). In this paper, Elasto-optic constant is measured using an edge-cracked three-point bending specimen. Elasto-optic constant is related to known stress intensity factors and specimen thickness. The full-field angular deflections around the crack-tip are measured using DGS. And then Elasto-optic constant were calculated from the experimental data by linear-least squares method.

Abstract: The new oil supply valve control box automatic tester is based on the C8051F040 micro controller, through the provision of analog signal and valve position signal to the control box, collection and judgment output control box, to realize the automatic test control box performance. The design has the advantages of friendly interface, simple operation,reliable performance etc. The result shows that it can greatly improve the efficiency and reliability of the control box to check.

Abstract: When robot do contact operation task to unknown environment, it often need wrist force sensor to check contact force information between robot and environment then judge the contact state, and check the information feedback to control system for completing operation smoothly. This paper analyze the measure theory of robot end wrist six-axis force sensor based on screw theory, propose and verify the limitation of six-axis wrist force sensor for measuring the six-dimensional force online.

Abstract: Requirements of the penetration test on various seamless gas cylinders are analyzed to determine the specific method of the penetration test on different types of gas cylinders. The actual penetration test on the cylinder for on-board storage of fuel for automotive vehicle is taken for example to make a comparison with the design method and validate correctness and reliability of the designed test methods; corresponding failure fracture is analyzed through a scanning electron microscope to validate the affect of the penetration test on safety performance of the seamless gas cylinder and predict the possible results under actual working conditions.

Abstract: The number of offshore wind farms increases gradually because of the high capability of power generation. However, the costs of manufacturing, logistics, installation and maintenance of offshore wind turbine are higher than those of onshore wind turbine. Thus the introduction of fault diagnosis is considered as a suitable way to improve reliability of wind turbine and reduce costs of repairs and casualties. In this paper, 3 major failures of direct-driven wind turbine according to urgency and system responses are discussed. A "memory-like" model pretreatment method and a fault diagnosis method for the failures are investigated. The simulation results show that total amount of fault data to be processed and stored is reduced, and difficulties of knowledge gaining and fault reasoning are also decreased.