52 results about "Nodal analysis" patented technology

A technique dynamically determines whether to reestablish a Fast Rerouted primary tunnel based on path quality feedback of a utilized backup tunnel in a computer network. According to the novel technique, a head-end node establishes a primary tunnel to a destination, and a point of local repair (PLR) node along the primary tunnel establishes a backup tunnel around one or more protected network elements of the primary tunnel, e.g., for Fast Reroute protection. Once one of the protected network elements fail, the PLR node “Fast Reroutes,” i.e., diverts, the traffic received on the primary tunnel onto the backup tunnel, and sends notification of backup tunnel path quality (e.g., with one or more metrics) to the head-end node. The head-end node then analyzes the path quality metrics of the backup tunnel to determine whether to utilize the backup tunnel or reestablish a new primary tunnel.

The invention relates to a method for evaluating the importance of nodes in a communication network, and belongs to the technical field of node analysis in the network. The method for evaluating the importance of the nodes in the communication network comprises the following steps: (1) establishing a mathematical model of a weighted network according to the actual communication network, (2) respectively calculating basic indexes, including a node degree k, a node betweenness b, a feature vector index Ce and a compactness index Cc, of the weighted network, conducting normalization, (3) conducting linear combined weighting on an F1, an F2, an F3 and an F4 to obtain a final score F of a comprehensive evaluation, (4) ranking the n nodes according to the value of the final score F of the comprehensive evaluation, using the nodes in the higher rank as the important nodes in the actual communication network, and therefore determining the importance of the nodes in the actual communication network. According to the method for evaluating the importance of the nodes in the communication network, firstly, the bandwidth is utilized for weighting the actual communication network, and then ranking of the importance of the nodes is achieved through the comprehensive evaluation.

A method of computationally determining material property changes for a cast aluminum alloy component. Accuracy of the determination is achieved by taking into consideration material property changes over the projected service life of the component. In one form, the method includes accepting time-dependent temperature data and using that data in conjunction with one or more constitutive relationships to quantify the impact of various temperature regimes or conditions on the properties of heat-treatable components and alloys. Finite element nodal analyses may be used as part of the method to map the calculated material properties on a nodal basis, while a viscoplastic model may be used to determine precipitation hardening and softening effects as a way to simulate the time and temperature dependencies of the material. The combined approach may be used to determine the material properties over the expected service life of a cast component made from such material.

The invention discloses an electromagnetic transient simulation modeling method based on a state variable nodal analysis combination frame. The method comprises the steps that an electric system is divided into a research system and an external system according to the nature of research questions, the external system is modeled through a state equation to acquire an output equation, a trapezoidal method is adopted to conduct differencing on the acquired state equation, the research system is modeled through nodal equations, and the calculation equation Gglobalu=iglobal of the state variable-nodal analysis combination frame is calculated to acquire a nodal voltage instantaneous value u (t) of the whole system; a nodal conductance matrix Gglobal of the whole system is regenerated, the nodal voltage instantaneous value u (t) of the whole system is acquired through a combination frame interpolation algorithm; an equivalent node injection current source column vector iN_hist of a next-moment state equation is calculated, and a node injection current source column vector iglobal based on the whole state variable-nodal analysis combination frame system is updated. The electromagnetic transient simulation modeling method based on a state variable nodal analysis combination frame achieves electric system state variable-nodal analysis combination simulation through interface variables.

An inspection system and method for serial high-speed image data transfer is provided herein. According to one embodiment, the method may include receiving multiple channels of image data at an input data rate and buffering the image data at the input data rate until the buffered data reaches a predetermined size. Once the predetermined size has been reached, the method may include packing the buffered data, encoding the data packet, serializing the encoded data packet and converting the encoded data packet into an optical signal. In some cases, the image data may be packed along with a data header containing information about the system. Once converted, each optical signal (i.e., representing one data packet) may be transmitted serially over one or more fibre channels to a processing node of the inspection system. In most cases, the data is packed, encoded, serialized and transmitted to the processing node at a data rate much higher than the input data rate. The processing node analyzes the optical signal to detect defects on a specimen under inspection.

The invention discloses a node analysis method-based self-healing control method for an intelligent power distribution network. A centralized control mode is adopted; and a network node topology analysis table generated on the basis of node attribute analysis is obtained by analyzing attributes of a power distribution network node. A master station communicates through an Ethernet and a power distribution terminal in the power distribution network, and achieves fault location and fault isolation of the power distribution network and power supply restoration of a non-fault region are achieved according to the generated network node topology analysis table and fault information and state information transmitted on the power distribution terminal. The method is simple and high in speed; flexible configuration can be carried out according to the actual demands of different sites while a software program does not need to change each time; and only a configuration table needs to change even if the network changes in future, so that the workload for software change is reduced.

The invention relates to a support vector data description shell algorithm. In response to problems and characteristics of data analysis model conformation and integration in distributed environment and bases on support vector data description (SVDD) algorithm, surrounding contour of the data is descried while parameters of the system are controlled, potential support vectors outside the contour are reserved, data which has no effect on future model conformation and integration is deleted, a hyper-spherical shell of potential support vector with certain thickness which describes data characteristics is formed, and the potential support vector quantity and model precision are balanced, thereby reaching the goal of expressing the model precisely by as little data as possible and reducing future model confirmation and integrating venture as a whole. The algorithm is applicable to models which are conformed and integrated by nodes in the distributed environment and to models which are found by analyses of different nodes.

The invention provides a steady non-decoupling method used for multiphase coupling transmission lines. The invention directly converts the multiphase coupling transmission line into a node analysis model-node admittance matrix under a phase coordinate. By adopting the matrix differential equation theory, the invention directly derives the node analysis model-node admittance matrix of the multiphase coupling transmission line under the phase coordinate, and gives a direct algorithm which calculates the node admittance matrix. The algorithm does not diagonalize the matrix that Gamma is equal to (ZY) <1/2>, thus avoiding the trouble brought by adopting a phase-module conversion method. The non-decoupling method of the multiphase coupling transmission line of the invention is a steady non-decoupling method which is used for multiphase coupling transmission line and has the advantages of wide adaptability, being directly applied to the electric network analyse, greatly reducing calculation quantity and high efficiency.

Computer time for modeling VLSI interconnection circuits is reduced by using symmetric properties of modified nodal analysis formulation. The modeling uses modified nodal analysis matrices then applies a Krylov subspace matrix to construct a congruence transformation matrix to generate the reduced order model of the VLSI.

The invention discloses an electromagnetic transient simulation interpolation method of a state variable oriented nodal analysis combination frame. The method comprises the steps of respectively building an electromagnetic transient simulation model of a research system on the basis of a nodal equation and a state equation; performing a trapezoidal method integral solution on a combination frame formed by the nodal equation and the state equation from the time t to time t+delta t; detecting all switch motion conditions; changing the state of switches, and rebuilding a transient compute matrix; re-detecting all the switch motion conditions; applying a linear interpolation method to extrapolate the time values including ts and ts+delta t/2 of the nodal equation and the state equation in the combination frame to the time value ts-delta t/2; adopting a two and a half step backward eulerian method to reinitialize the combination frame from the time ts-delta t/2 to the time t+delta t; comparing the context of the time ts+delta t/2 with the time t+delta t, if ts+delta t/2 is greater than t+delta t, performing one-step linear interpolation to obtain the value of the time t+delta t, and otherwise, performing the trapezoidal method integral solution on the combination frame from the time ts+delta t/2 to the time ts+3delta t/2. According to the electromagnetic transient simulation interpolation method, the calculation and reinitialization of the system state at the switch motion moment can be realized so as to eliminate the numerical value vibration problem after the switch moves.

A physical verification tool for debugging ESD ground path resistance violations in ESD protection circuits. The ESD ground path is modeled and partitioned into component path structures (polygons) that are disposed in associated design layers. A total ESD ground path resistance is then calculated and compared with a maximum allowable resistance value defined by an ESD protection rule. When the ESD ground path is non-compliant, a resistance contribution ratio is determined for each polygon and/or for each layer, for example, by applying nodal analysis to the ESD ground path model. Resistance contribution ratios are then calculated for each polygon and/or for each layer, and most-problematic polygons and/or layers are identified by way of having the highest resistance contribution ratio values. A report (e.g., a table or graphical visualization) is then generated that prioritizes or emphasizes (e.g., by way of a bolder contrast or brighter color) the most-problematic layer and/or polygon.

This invention involves a data conformity method in the peer-to-peer network, which includes the following steps: Firstly, it establishes P2P network and determines the clustering structure. Secondly, it determines each role of the ascertaining maintaining device, indexer, security inspection and data hub. Thirdly, it sends requirement from the maintaining device. Fourthly, it analyzes the data form the ordinary node, completes interface parameter table and dictionary table, and stores it in the data hub node. Fifthly, it revises interface parameters table and dictionary table artificially. Sixthly, it starts system operation. Seventhly, it imports the data into database by the import components of data hub for use. Based on P2P system, the invention solves data alternation of heterogeneous logic structure system, some difficult problems in automatic import, export and data integration, and can be applied to electronic government affairs, electronic commerce and decision system for reducing development costs and enhancing system functions.

Methods and systems for interactive image analysis include receiving a selection of a region of an image and a request for analysis of the selection at an interface layer, transferring the selection and the request to an interpretation layer for analysis, dividing the selected region of the image into a plurality of sub-sections optimized for parallel computation to provide an analysis result that minimizes perceptible delay between receiving the request and receipt of results, analyzing the sub-sections using one or more execution nodes using a copy of the image stored in a shared memory, and providing combined analysis results to the interface layer for display.

A method for performing voltage drop calculations in an alarm circuit comprises creating a circuit to be controlled. A first device is selected from a list of devices to add to the circuit. An estimated power supply of the first device is calculated using modified nodal analysis of the circuit and it is determined whether the estimated power supply of the first device is sufficient power for the first device to operate.

The invention relates to a 0+ error immune electromagnetic transient simulation algorithm used under the sudden change of input quantity and belongs to the technical field of electromagnetic transient analysis of an electric system. According to the method, by means of the impulse response invariable principle, numerical sampling of a continuous signal of the system corresponds to Z conversion of a discrete signal, and the fundamental form of an element based on operation conductance and a history current item is given. Based on the form, a system network equation is obtained according to the node analysis method, and a system electromagnetic transient simulation result is obtained according to the same steps. The method has the advantages that the truncation error is smaller than that generated through currently adopted methods and the 0+ error purpose is realized under the sudden change of the immune input quantity, achieves non-linear load modeling of the electric system, solves the problem of oscillation of an electronic power switch model state variable outburst value, and provides a new way for electromagnetic transient branch-level modeling of the electric system.

The invention provides an electrical circuit modeling method, a simulation test system and a simulation terminal. The method comprises the following steps: enabling the on-state of a nonlinear switching device in an electrical circuit to be equivalent to equivalent inductance, and enabling the off-state of the nonlinear switching device to be equivalent to equivalent capacitance; building a capacitor and a capacitor discrete model in an electrical circuit according to the equivalent capacitor; building an inductance discrete model according to the equivalent inductance and inductance in the electrical circuit; processing according to the capacitance discrete model and the inductance discrete model to obtain an equivalent model; and processing the equivalent model by using a node analysis method to obtain an electrical circuit multiplication model. According to the electrical circuit modeling method, the simulation test system and the simulation terminal provided by the invention, the electrical circuit real-time transient simulation test system can be built, a more efficient test scheme is provided for an electrical circuit control technology, the experimental research and verification time of the electrical circuit control technology is effectively reduced, the development cost is saved, and the development period is shortened.

The invention relates to a semi-fine numerical simulation method for a node of a prestressed assembly type concrete structure, which is used for establishing a semi-fine simulation model for simulating a beam column or column foot node of the prestressed assembly type concrete structure, and comprises the following steps of: 1, constructing a beam column unit grid; 2, simulating the precast concrete members through a plane stress unit, and simulating the contact surfaces between the precast concrete members through a contact unit; 3, simulating the mechanical changes of the common steel bars and the prestressed bars in the prefabricated concrete member through truss units; 4, simulating the steel bar energy dissipation pieces and other energy dissipation pieces in the model under the action of stress by using a truss unit or a special energy dissipater unit; 5, simulating the friction effect between the steel bars and the concrete in the model by setting a nonlinear spring method. Different unit methods are adopted for simulation through different components, the simulated steel bars are simplified, the requirement for node analysis stress is met, and it is guaranteed that the simulation process is accurate and simplified.

Systems and methods include a method for optimizing smart well completions using real-time nodal analysis including recommending changes to downhole settings. Real-time well rates and flowing bottom-hole pressure data at various choke settings for multiple flow conditions are collected for each lateral of a multilateral well. Recommended optimizing changes to downhole inflow control valve (ICV) settings for surface and subsurface ICVs are determined based on the real-time well rates and the flowing bottom-hole pressure data. The optimizing changes are designed to optimize production in the multilateral well. The recommended optimizing changes to the downhole ICV settings for the surface and subsurface ICVs in the laterals are provided for presentation to a user in a user interface of a multilateral well optimizing system. A user selection of one or more of the recommended optimizing changes is received. The recommended optimizing changes selected by the user are implemented.