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A numerical method is presented in this paper to determine the transient electric field inside wind turbine towers struck by lightning. The tower is modelled by a coupled RLC network and the lightning transient responses of the network are calculated by solving its equivalent calculation circuit. The formula of transient electric field is derived from Maxwellpsilas equations based on the obtained...
In this paper, we propose a hierarchical and heterogeneous P2P-SIP architecture, which is independent of the underlying DHT overlay and makes the combination of P2P and SIP practical. Peers who work in heterogeneous overlays, i.e. Chord, Kademlia and Pastry, can intercommunicate with other peers who are in different overlay via a decentralized manner provided by the hierarchical P2P-SIP architecture...
The trend of future communication network is the All-IP network, which brings huge opportunities for mobile P2P network. The distributed computing mode of P2P technology replaces the centralized control mode in traditional telecommunication system, so it makes traditional communication network billing control come across a lot of difficulties. We propose a flow oriented billing model for mobile P2P...
This study proposes an extended subspace method (ESM) in feature extraction and dimension-reduction problems for land cover classification of hyperspectral and multi-spectral remote sensing images. The main idea of our method is to use a multiple similarity method (MSM) onto an averaged learning subspace method (ALSM) and makes use of fidelity value criteria in the selection of the optimal subspace...
This paper presents an approach of modeling for Fiber Optic Micro Cable (FOMC), constructs a coupled nonlinear model for Remotely Operated Vehicle(ROV) connected with FOMC, and makes computer simulation at last. The model of FOMC takes use of the lumped mass method in which FOMC is considered to be a system of micro units connected by elastic non-mass spring. Four order Runge-Kutta method is used...
A novel power transmission expansion planning model and its application algorithm which considers the transmission surplus capacity and load factor of the transmission line is presented. In traditional transmission expansion planning, some transmission lines will run at a high load factor due to ignore the load level of transmission lines. This may lead to congestion in network and degrade dispatch...
This paper presents a simulator to simulating two key problems-underwater perception and autonomous manipulation o In the simulator a controller-observer strategy is proposed. A new SLAM (Simultaneous Localization and Mapping) algorithm - UKF (Unscented Kalman Filter) is used to estimate the state of UVMS (Underwater Vehicle Manipulator Systems) and the target object. 3D Simulation results show that...
In this paper, we analyze network traffic behavior by decomposing header traffic into control and data planes to study the relationship between the two planes. By computing the cross-correlation between the control and data traffics, we observe a general 'similar' behavior between the two planes during normal behavior, and that this similarity is affected during abnormal behaviors. This allows us...
With widely use of pervasive computing, intelligent transportation system becomes more and more important in traffic management. Compared to some technologies, this paper constructed a detection and tracing algorithm of moving vehicles by using position prejudge and template matching technologies. Applied template matching technology can solved vehicles blocked or split, when tracking vehicle, and...
Kinematics decoupling characteristics (KDCs) for parallel manipulators simplify the kinematics models, and make them easier in calibration and control. This paper focuses on KDCs for parallel manipulators which are described in detail. The relationship between input and output of a system with KDCs is discussed and the characteristics of its transfer matrix are educed. Then, the kinematics of two...
In this paper, we introduce the ecological influence of transmission line and discuss the electromagnetic field of 500 kV four circuits transmission lines (FCTL) on same tower as well as its ecological environment effect. The paper describes the conventional equivalence charge method (ECM) and presents its disadvantages. Based on this, we propose the two dimensional finite elemental model for the...
An EMTP model is presented for calculating overvoltage in transformer windings under VFTO in this paper. Firstly, the voltage transfer functions are calculated from the S parameters which are measured by network analyzer or calculated from the distributed parameters of transformer windings. Secondly, the voltage transfer functions are fitted with rational functions by vector fitting codes and then...
A semi-physical virtual reality system applying to MSV (manned submersible vehicle) control study is presented in this paper. This system is composed of three nodes: (1) control node for receiving sensors information and sending control command, (2) virtual sensors node for virtual devices and sensors and (3) Visualization node for virtual ocean environment and displaying the posture of MSV. The control...
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