Advanced Materials Research Vols. 765-767

Abstract: The computational and storage resources of Wind Plant couldnt be fully utilized is a problem worth paying attention.The remote falut diagnosis center of wind turbine can integrate the data of each Wind Plant together, but the large amounts of data generated by the Wind Plant increase the cost of the enterprise. The Cloud Computing Platform which was built on the computing clusters with commodity machines can fulfill the demand of the mass storge and large-scale computing, and improve the real-time fault diagnosis evidently. With the web interface of the Cloud platform application, the accending personnel can look over the failure analysis results, inspection reports, and failure prediction system at the first time to prevent accidents and minimize the damage of the Wind Turbines.

Abstract: In view of such characteristics as of the faraway and scattered orchard monitoring sites, complex environmental elements, great weather effect and difficult monitoring and management, it has studied the remote monitoring and management system for the orchard environment in which the 3G technology and DDNS dynamic domain name technology are used as the wireless communication network: That is to say, the 3G network is used in combination with the DDNS domain name technology to remotely transmit orchard meteorological environment factors such as the air humiture, soil humiture, rainfall and solar photosynthetic radiation perceived by the in-orchard sensors and the fruiter video images to the monitoring centers server and the ASP.NET and ADO.NET technologies to implement the real-time publication on the Internet of the orchard environmental data, so as to provide the users with the remote monitoring and management for the orchard environment.

Abstract: A novel approach is introduced in this paper to detect abnormal behavior based on global motion orientation. Compare to the normal behavior (walking, shaking hands etc.), abnormal behavior has different orientation. The method we introduced divides each frame into blocks, makes statistical analysis of the global motion direction histogram of all frame blocks and extracts characteristics. At last, behavior is detected with support vector machine (SVM). Experiment shows that the method proposed in the paper has certain robustness and can achieve real-time monitoring.

Abstract: Current transformer (CT) is an important transmission equipment in power systems. DC bias and remnant flux can change the working point of CT in the core magnetization curve and has a direct impact on the accuracy of electric energy metering and measurement. The simulation circuit model is built by using the simulation software PSCAD and the change of ratio error, phase displacement and exciting current with DC bias and remnant flux are analyzed. The results show that DC bias and remnant flux will both increase the ratio error and phase displacement in opposite directions and the error size will be far more than the limit value when DC bias and remnant flux exist in same direction at the same time. Furthermore, the existence of DC bias and remnant flux will also cause the raise of exciting current size, asymmetry of exciting current waveform and appearance of even harmonics. This will seriously affect the transmission accuracy of measuring CT.

Abstract: Sufficient icing data are very important for the design and operation of power grid in the places with potential accreted ice, meaning that it is necessary to pay due attention to the ice measurement devices. In this paper, the current ice measurement devices are classified into different types according to corresponding classification criteria with the aim of understanding the characteristics of each type of devices. Moreover, the research progress of the manual ice measurement devices are introduced in detail, including the diameter of conductors, the angle between conductor and wind direction. Finally, the existing problems are proposed for the further development of manual ice measurement devices for overhead transmission lines.

Abstract: In this paper, we consider an SI model with cross-diffusion, and show that the measuring technology and its application, namely, the cross-diffusion is able to induce the Turing instability under some conditions.

Abstract: A circular wave energy converter (WEC) is put forward to solve the cable loosing problem of the non-circular structure WEC model. The circular device mainly consists of a double acting ratchet, cable, a driving wheel, four fixed pulleys, a counterweight, a gear box and a generator. In this modified model, the weight of counterweight is smaller than that of the float. The model can obtain a bigger maximum and average driving torque when the float rises, so that the utilization rate of wave energy is improved. Moreover, the influence of the float shape is also discussed.

Abstract: Colliding ground vibration wave consists of compressional wave, shear wave and surface wave, and it spreads by the attenuation through the different rock or soil. Comparing from the frequency and duration to the blasting vibration, with the engineering example, the analysis on the characteristics of colliding ground vibration has made. It is the conclusion that its vibration frequency is close to the building, and the vertical vibration is greater than horizontal vibration, and frequency bandwidth decreases along the distance, while the duration increases.

Abstract: High Power Laser System (HPLS) is a large optical instrument, provides extremely high temperature and pressure conditions for inertial confinement fusion (ICF) and high-energy-physics research. It contains large number of optics and which would be easily damaged due to high fluence of laser power. The contamination control of optical surfaces has a great significance to ensure the performance of the system and decrease costs. This paper discussed the background and development of cleanliness control techniques in high power laser systems, including contamination induced laser damage (CILD), contamination inspection, optical surface cleanliness degradation and maintaining.

Abstract: In order to ensure the reliability of the operational of circuit breaker, we used intelligent monitoring unit to realize the high-speed acquisition of the electrical, mechanical and insulated signal in the operation of the high voltage circuit breaker and actuator. Combined with signal processing and fault analysis theory, we estimate the operating status based on the accurate acquisition of the various operating parameters in breaker actuator. We also developed a system of remote online monitoring of circuit breaker status and fault diagnosis. The system ensures reliable operation of the circuit breaker. It also provides fast and accurate information for operation scheduling and maintenance personnel and accumulates large amounts of raw data for the state overhaul of the circuit breaker.