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Zhu Z.,Extra Highvoltage Branch JiangXi Electrical Power Company | Li J.,Extra Highvoltage Branch JiangXi Electrical Power Company | Liu J.,Extra Highvoltage Branch JiangXi Electrical Power Company | Jiang H.,Dong Fang Electrical Corporation Ltd
Advanced Materials Research | Year: 2013

With the build of Monitoring Center in our country, a great of signals are uploaded from many substations which are located on every corner. When an abnormal or a grid fault in Power System happens, lots of signals come out, then many operators on duty can't often react quickly and judge the fault accurately. Recently, more and more scholars begin studying intelligent alarm processing system. In this paper, by analyzing signals characters and SCADA network of Monitoring Center, an intelligent processing frame to alarms in monitoring center is provided, the frame includes three layers named signals foundation treatment layer, signals connecting and sharing layer, signals intelligent diagnosis layer. Now the frame has been implemented successfully in Monitoring Center of our company. At the same time, based on an virtual signals software, lots of devices alarms and grid faults are simulated, this intelligent processing system, which are built on the frame, always show the alarm tip quickly. Facts prove it attributes to grid fault judge for operators of Monitoring Center. © (2013) Trans Tech Publications, Switzerland. Source

He P.,Jiangxi Electrical Power Company | Zhu Z.,Jiangxi Electrical Power Company | Jiang H.,Dong Fang Electrical Corporation Ltd
Advanced Materials Research | Year: 2013

In a centralized control center SCADA system, thousands of real-time data are sent to SCADA, including real-time signal, telemetering and alarm information. The intelligent analysis and processing of alarm signals is an important requirement. This article from the design point of intelligent alarm rules, explore an internal reasoning knowledge base and the external definition of rules combined design algorithm. Practical application results show that, the algorithm to power a variety of abnormal and fault has better capture and analysis ability. © (2013) Trans Tech Publications, Switzerland. Source

Tang J.,Central South University | Pu T.,Central South University | Pu T.,Dong Fang Electrical Corporation Ltd
Jixie Gongcheng Xuebao/Journal of Mechanical Engineering | Year: 2011

The calculation of spiral bevel gear meshing stiffness is the foundation of dynamic analysis. An approximate sine or cosine series are applied for dynamic analysis, which influences the computational accuracy. Based on the theory of finite element analysis for spiral bevel gear with loaded contact, a computational method of spiral bevel gear meshing stiffness is developed, and the key technologies and pre-processing methods are given. A spiral bevel gear model with five teeth is constructed using ABAQUS software. The normal contact force and integrated elastic deformation are computed, and the meshing stiffness of single and multiple teeth are achieved considering the influence of difference loads. Computing results show that the loads have a major effect on the meshing stiffness amplitude and period, and that impacts of the loads on contact ratio and the contacting position need to be considered for the calculation of meshing stiffness. Comparing the results of the development calculation method with existing literatures for involutes spur meshing stiffness, the correctness of the meshing stiffness calculation method is verified, which lays the foundation of dynamic analysis for spiral bevel gear. © 2011 Journal of Mechanical Engineering. Source

Yang S.,Sichuan University | Liu Y.,Dong Fang Electrical Corporation Ltd | Sun Y.,Sichuan University
Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery | Year: 2013

A method of position analysis for spherical mechanisms with four-bar closed-loop chains was proposed. The mechanism was divided into a four-bar closed-loop mechanism and a single-opened-chain (SOC) unit. The constraint equation of the four-bar closed-loop was established with spherical loop equation. The constraint equation of SOC was set up with coordinate transformation and direction cosine matrix. The coupled constraint equation of whole mechanism was built up based on spherical trigonometry. The proposed method was simple to set up constraint, easy for elimination and less extraneous root, which was helpful to obtain symbolic solutions or figure-symbolic solutions. Source

Tang Q.,Dong Fang Electrical Corporation Ltd | Tang Q.,Sichuan University | Liu S.,Dong Fang Electrical Corporation Ltd | Shang L.,Dong Fang Electrical Corporation Ltd | Li Y.,Dong Fang Electrical Corporation Ltd
Sichuan Daxue Xuebao (Gongcheng Kexue Ban)/Journal of Sichuan University (Engineering Science Edition) | Year: 2016

The design method of the teleoperation control system using industrial robot KUKA for was introduced the hazard environment and the control algorithm with heterogeneous master/slave structure. Using the Eth. KRLXML software package, a communication based on TCP/IP was connected between the robot controller and the remote computer. The joint angles and positions of the endpoint of the KUKA robot were sent periodically to the remote computer and commands from the remote computer were received and executed by the KUKA robot. Teleoperation control algorithm with relative scale transformation was adopted in the teleoperation system. Motions of the master manipulator was transformed to the slave manipulator's coordinate. By implementing the scaled relative position and pose transformation, the proposed control algorithm not only could be used in the designed heterogeneous master/slave structure, but also could satisfied different operation space requirements with high accuracy. Physical experiments verified the proposed teleoperation system and the proposed master/slave control algorithm. © 2016, Editorial Department of Journal of Sichuan University (Engineering Science Edition). All right reserved. Source

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