Product
Patsnap Eureka
For R&D, Patsnap Eureka makes reading and utilizing patents & technical documents easy.
Patsnap Eureka AIR
Designed for self-driven R&D workflows. Generate viable solutions, solve complex R&D challenges, empower your innovation with AI.
Patsnap Eureka Materials
Designed for material experts only. Revolutionize your material R&D, from search, analyze, to developing new materials.
Feature
TechResearch
Generate reliable direction feasibility study reports for your R&D in just a few steps.
TechSeek
Discover and master advanced knowledge NOW. Basics, ideas, possibilities, all at once.
TechMind
As an expert in R&D Theories, TechMind can generates customized viable solutions instantly.
TechRisk
Analyze your overall solution with one click, know your potential R&D risks in advance.
TechMonitor
Get weekly tech updates, stay abreast of the latest tech innovations and key insights.
Patents
Literature
Hiro is an intelligent assistant for R&D personnel, combined with Patent DNA, to facilitate innovative research.
133 results about "Flow computation" patented technology
Efficacy Topic
Property
Owner
Technical Advancement
Application Domain
Technology Topic
Technology Field Word
Patent Country/Region
Patent Type
Patent Status
Application Year
Inventor
Method for dynamically reserving bandwidths in SDN and controller
The invention discloses a method for dynamically reserving bandwidths in an SDN and a controller. The method includes the steps that the SDN controller calculates at least one selectable path according to a source address and a destination address carried by a received first message, sent by a virtual switch, of service flow, and the priority of the service flow is not smaller than a priority threshold value; remaining bandwidths of all switches on the selectable paths are determined; one path is selected from the selectable paths and determined as a forwarding path used for forwarding the service flow, wherein the remaining bandwidths of all the switches on the path are not smaller than the bandwidth needed for forwarding the service flow; a reservation informing message is issued to all the switches on the forwarding path, and the reservation informing message carries the bandwidth needed for forwarding the service flow so that all the switches on the forwarding path can reserve the bandwidth needed for forwarding the service flow for the service flow. The enough bandwidths are reserved for all forwarding paths calculated for the service flow, and the problem of flow congestion is effectively avoided.
Owner:NEW H3C TECH CO LTD
Bandwidth on demand in SDN networks
ActiveUS20160065422A1Data switching by path configurationDistributed Computing EnvironmentService level requirement
Bandwidth-on-Demand (BoD) as a network service (BoD-as-a-Service) is integrated into applications that end-users can flexibly purchase when and for however long they need it. A centralized Software Defined Networking (SDN) controller and distributed SDN controller agents that may be seen in a Service Provider, Enterprise or distributed computing environment with remote and mobile end-users is provided. The end-user initiates the BoD request using an application via desktop, cloud, smartphone or tablet. The BoD Service Provider, Enterprise, has a controller-based centralized view of the complete SDN service topology. On receiving the request, the BoD provider dynamically computes the optimal end-to-end path through the SDN topology that best suits the end-user requested traffic types and service level requirements. It then translates that optimal path into flow computations that are dynamically pushed down to the controller agents to provision the BoD network path in real-time. An on-demand and real-time bandwidth service for consumers are herein provided where it was previously too costly or too time consuming to set up.
Owner:EXTREME NETWORKS INC
Method for implementing parallel power flow calculation based on multi-core computer in electric grid
The invention discloses a method for realizing parallel load flow computation based on a multi-core computer in power grid. The method comprises two-stage scheduling, wherein the first-stage scheduling realizes division and cooperation of load flow computation task, and the second-stage scheduling performs fine division to the computation task, in the multi-core computer, subtasks can be parallelly calculated, and after several iterative convergences, the computation results are collected and outputted by a coordination layer. The invention adopts the parallel computation and maximally utilizes the computation resource in virtual organizations, so that the computation speed is faster and the cost is lower.
Owner:NANJING UNIV
Enhanced sequential method for solving pressure/flow network parameters in a real-time distributed industrial process simulation system
ActiveUS20130204587A1Good and faster simulationImprove accuracyProgramme controlSimulator controlCalculation techniqueComputer engineering
A pressure and flow calculation technique can be used in a distributed process network simulation system that uses the sequential solving method to perform better or faster simulations of a process flow, especially with respect to process junction nodes at which flow either converges or diverges. The pressure and flow variable determination technique uses a grouped node identification technique that identifies a local set of nodes for each junction node of the process network to use when solving for the pressure at the junction node, a grouped node iteration technique that uses the grouped set of nodes at each junction node to perform iterative pressure calculations at the junction node, and a flow-based pressure calibration technique at each junction node to enable the system to perform highly accurate pressure and flow variable determination at each junction node in real-time.
Owner:EMERSON PROCESS MANAGEMENT POWER & WATER SOLUTIONS
Ultrasonic-densiometer mass flow sensor for use in flow metering units
InactiveUS20070151333A1Accurate mass flow rate informationAccurate informationAerodynamic testingEngine testingFlow transducerEngineering
A fuel delivery system uses a volumetric flow sensor and a densiometer to measure a mass flow rate of the fuel. A densiometer may be a coriolis mass flow sensor etched into a small circuit chip. As fuel flows past the densiometer a density of the fuel and characteristic slope as a function of temperature is determined. At least one temperature sensor is also located on the circuit chip to provide accurate temperature of the fuel to correspond to the fuel density reading. Piezoelectric crystals in the volumetric flow sensor generate and receive a sound wave. By analyzing the sound wave signals the volumetric flow rate of fluid through the volumetric flow sensor can be calculated. At least one temperature sensor is also placed on the volumetric flow sensor to correct for any thermal expansion of an inner diameter of the volumetric flow sensor and for final mass flow calculation. The density and temperature information from the densiometer and the volumetric flow and temperature information from the volumetric flow sensor are used to determine the density of the fuel at the volumetric flow sensor. By using the density calculated at the volumetric flow sensor and using the volumetric flow information an accurate mass flow rate of the fuel at the volumetric flow sensor can be calculated.
Owner:HAMILTON SUNDSTRAND CORP
Water flow elaborate simulation method of hydraulic of hydropower station
InactiveCN101017515AReduce pressure pulsationSpecial data processing applicationsAnalogue processes for specific applicationsPower stationWater turbine
This invention discloses one water power station stream fine analogue method in water engine technique field, which can fulfill water turbine total channel three-dimensional and non-constant flow computation; computing the water turbine for three dimensional constant hollow flow and analyzing the space generation rules; reducing the water turbine pressure impulse composed of rotation wheel leakage tamper shape and length and tail tube shape; based on three-dimensional flow computation studying one generation of high property X leave modern optimization design method.
Owner:CHINA THREE GORGES UNIV
Maintenance scheduling safety evaluation method based on power generation loss and load supply adequacy
ActiveCN101764406AMeet safety requirementsImprove securitySpecial data processing applicationsInformation technology support systemMissing dataParallel computing
The invention belongs to the field of maintenance scheduling evaluation and optimization in the power system and relates to a maintenance scheduling safety evaluation method based on power generation loss and load supply adequacy. The method comprises the following steps: firstly integrating network topology data and planning data into flow data, extracting the missing data from the reference flow data to form complete flow, simultaneously carrying out sensitivity analysis based on network topology and computing the generating capacity loss and the load supply adequacy according to the results of sensitivity analysis and flow computation, wherein evaluation based on the generating capacity loss is to compute the sensitivity of a generator to all the branches by system network topology and compute the normalized value of the generating capacity loss according to the formula; and evaluation based on the load supply adequacy is to compute the adequacy of bus load supply according to the flow computation result, the sensitivity computation result and the branch operating limit restraint. The method solves the problems in the existing methods.
Owner:NARI TECH CO LTD +1
Shock absorption device and control method thereof for small swing radius excavator
InactiveUS20090151346A1Process safety and stabilityEasy constructionFluid couplingsServomotor componentsHydraulic pumpEngineering
A shock absorption device and a control method thereof for a small swing radius (SSR) excavator are provided, which can relieve shock generated on a boom cylinder by controlling only the discharge flow rate of hydraulic pumps, being supplied to the boom cylinder, even without controlling a main control valve when a boom of the excavator ascends at its maximum height through manipulation of a control level. The shock absorption device for an SSR excavator includes first and second hydraulic pumps, a control lever, a boom cylinder coupled to the first hydraulic pump, a main control valve for controlling a start, a stop, and a direction change of the boom cylinder, a boom-up manipulation amount detection means, a hydraulic pump flow computation means, a boom confluence means for making hydraulic fluid discharged from the first and second hydraulic pumps confluent together, a boom deceleration region detection means for detecting a boom deceleration region, and a flow controller for controlling the discharge flow rate of the first and second hydraulic pumps.
Owner:VOLVO CONSTR EQUIP HLDG SWEDEN AB
Hybrid sequential and simultaneous process simulation system
ActiveUS20130211601A1Fast executionStable numerical resultProgramme controlSimulator controlProcess simulationComputer science
A pressure and flow calculation technique that efficiently solves for pressures and flows within a process network uses both a simultaneous and a sequential solving method. The calculation technique first determines a flow conductance for each of the process network elements, linearizes pressure and flow relationships in each flow path by determining a linearized flow conductance for each process element and then determines a composite process network having a linearized, composite process component in each flow path to produce a simplified process network. A simultaneous solving method is then used to simultaneously solve for the pressures and flows at each of a set of junction nodes of the simplified process network and thereafter a sequential solving method is applied to determine the pressures and flows at the other nodes of the process network.
Owner:EMERSON PROCESS MANAGEMENT POWER & WATER SOLUTIONS
System and method for measuring flow
InactiveUS20060123921A1Accurate measurementExtend flow measurement rangeVolume/mass flow measurementSpeed/accelaration controlReal-time computingOperation mode
One embodiment of the present invention can comprise a primary flow measurement system, a secondary flow measurement system in fluid communication with the primary flow measurement system and a control coupled to the primary flow measurement system and the secondary flow measurement system. The controller can comprise a processor and a memory accessible by the processor. The processor can execute computer instructions stored on the memory to calculate a flow rate using the primary flow measurement system, in a first mode of operation, and calculate the flow rate using the secondary flow measurement system, in a second mode of operation. The computer instructions can be further executable to switch between the first mode of operation and the second mode of operation based on a predefined parameter.
Owner:BROOKS INSTRUMENT
Method and device for realizing flow shaping based on network processor
The invention discloses a flow shaping implement method based on the network processor and the device therof, wherein the method includes: a queue management step, used for carrying the enquene, the dequeue and queue congestion processing of the message; a queue dispatching step for carrying the queue dispatching based on the port and the operation according to the message scheduling strategy; an operation flow shaping step, for completing the flow computation of different operation message to determine whether the queue dispatching of the operation is delayed according to the message flow; a port flow shaping step used for carrying the queue dispatching based on the port for the message input end queue of the output operation queue, completing the flow computation of the port according to the port flow to delay the queue dispatching of the part or transmit the message of the port queue. The invention realizes the second grade flow shape based on the port and the operation without special TM chip.
Owner:ZTE CORP
System and method for mass flow detection device calibration
InactiveUS20040030522A1Low costHigh yieldVolume/mass flow by thermal effectsVolume flow proportion measurementCalibration gasTraffic volume
Systems and methods for correcting measurements of fluid flow using device-specific information to compensate for differences between individual devices of the same design. In one embodiment, a method comprises providing device-specific calibration data; sensing a fluid flow; computing a measured fluid flow based on the sensed fluid flow, and correcting the measured fluid flow based on the device-specific calibration data. More particularly, the fluid flow measurement is corrected using correction factors that compensate for the use of a gas that is different from the calibration gas (CF0(1+aF+bF<2>+cF<3>)), for device variations in sensor sensitivity (1+alphaDeltaR), and for variations in the split flow of fluid through the flow meter (1-betaDeltaADC(Sp / 100)<2>). The sensor and split flow correction factors may be used independently of each other in some embodiments.
Owner:BROOKS INSTRUMENT
Flexible high-voltage direct-current (HVDC) load flow computational model and computational method thereof
ActiveCN102751720ADoes not affect calculation convergence propertiesDoes not affect convergence propertiesElectric power transfer ac networkTransformerComputational model
The invention provides a flexible high-voltage direct-current (HVDC) load flow computational model and a computational method thereof. The model is arranged in an alternative-current / direct-current composite electric network and comprises a control system, a converter transformer 1, a converter transformer 2, a filter 1, a filter 2, a commutation reactor 1, a commutation reactor 2, a virtualization service client (VSC) current converter 1, a VSC current converter 2, a direct-current capacitor and a direct-current power transmission circuit as well as an alternative-current electric network 1 and an alternative-current electric network 2, which are accessed by a direct-current system; and the method comprises steps of (1) increasing parameters of the converter transformer and a filter in the data of the alternative-current electric network; (2) inputting flexible HVDC systematic parameters and performing per-unit processing for the systematic parameters; (3) calculating VSC equivalent power generation active power controlled by constant direct-current voltage; (4) setting a type and a running parameter for a VSC equivalent power generator; and (5) starting the alternative-current / direct-current composite load flow computation. Due to the adoption of the model and the method, the flexible HVDC alternative-current / direct-current composite electric network load flow computation can be realized, the development and maintenance of a great amount of codes are not needed, the load flow status of the composite electric network can be high-efficiently solved, and an initial value can be provided for the dynamic property simulation of the composite electric network.
Owner:CHINA ELECTRIC POWER RES INST +1
Method and system for calculating leakage amount based on DMA zoning flow
ActiveCN109388904AImprove accuracyThe science of how time periods are determinedDesign optimisation/simulationComplex mathematical operationsTraffic capacitySCADA
The invention discloses a method and a system for calculating the leakage amount based on DMA zoning flow. The method comprises the following steps: a flow meter is installed at an inflow point of theDMA partition; the upload interval time of the flow meter data is set. The sampling data of the flowmeter is uploaded to the SCADA system in real time, and then the sampling data of the SCADA systemis called by the water supply management system, and the sampling data is stored in the database of the water supply management system. According to the sampling data, the first flow data and the second flow data are obtained, the minimum night flow time period is determined, and whether the second flow data conforms to the normal distribution is judged, so as to determine the leakage amount of the DMA partition. By calculating the leakage amount after judging the normality of the second flow rate data, the accuracy of the calculation result of the leakage amount can be improved and the calculation efficiency can be improved.
Owner:TAIHUA WISDOM IND GRP CO LTD
Valve flow function optimization method based on unit operation data
InactiveCN104200121AReduce optimization timeImprove optimization efficiencySpecial data processing applicationsTraffic capacitySteam pressure
The invention discloses a valve flow function optimization method based on unit operation data. According to the method, operation data of a thermal power generating unit is processed to obtain actual valve flow performance data of the thermal power generating unit; finally, an ideal valve flow function is established on basis of the actual valve flow performance data; configuration of a digital electro-hydraulic system of the thermal power generating unit is set with the ideal valve flow function so that an actual valve flow function is consistent to the ideal valve flow function, and the valve flow function is optimized. Compared with the prior art, the method has the advantages that the valve flow function can be optimized without performing a valve flow performance test, optimization time is shortened, and optimization efficiency is improved; the influence of main steam pressure is fully considered in the calculation of theoretical steam flow, a calculation error caused by fluctuation of the main steam pressure is avoided, and optimization precision is improved.
Owner:STATE GRID CORP OF CHINA +2
Bearing cavity ventilation design method of aero-engine
The invention relates to a bearing cavity ventilating design method of an aero-engine and fundamental assumption of throttling and ventilating bearing cavity of the aero-engine, a method for calculating pressure and flow of a throttling hole, and a cavity pressure calculating procedure. Firstly, boundary parameters of the bearing cavity are obtained and repeated iteration united algorithm is performed on cavity pressure of an air system and an accessory cartridge receiver to obtain the pressure of the bearing cavity. Secondly, assumption is performed as follows. Only steady-state conditions of the aero-engine undergo calculation. The total pressure of the bearing cavity in a steady sate is assumed to stagnation pressure. A flowing process of air currents passing through the throttling hole from the bearing cavity is assumed to be an isoenergetic isentropic process. An oil returning pump of the bearing cavity neglects influences on the cavity pressure and then the throttling and ventilating bearing cavity of the aero-engine is solved. The bearing cavity ventilating design method of the aero-engine has the advantages that calculating data on the pressure of the bearing cavity of a throttling and ventilating aero-engine lubricating system can be obtained in a flight envelope and design of throttling and ventilating systems of lubricating systems of power of a military aero-engine, a civil plane, a gas turbine and a boat can be guided and the application prospect is wide.
Owner:AECC SHENYANG ENGINE RES INST
Calculation method of outburst discharge of large particle weir and plug dam under impact of outburst viscous debris flow
ActiveCN108984962AVerify reliabilityGeometric CADSpecial data processing applicationsDebris flowCalculation methods
A calculation method of outburst discharge of a large granular weir and a plug dam under the impact of outburst viscous debris flow is disclosed. Through analysis of the static equilibrium relationship of large particles in a weir-plug dam under the impact of viscous debris flow, the formulas for calculating the critical mud depth of debris flow and the maximum particle diameter in weir-plug dam are derived, then the calculation model of weir plug dam outburst discharge and maximum particle diameter is established by using the calculation formula of weir plug dam outburst discharge, and the reliability of the model is verified by an example, and thus an accurate and reliable calculation method is provided for determining the outburst discharge in debris flow prevention and control engineering.
Owner:SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
Flexible DC-containing AC/DC hybrid system power flow alternating iterative computation method
ActiveCN108493940AImprove accuracyAc networks with different sources same frequencyHybrid systemPower flow
The invention provides a flexible DC-containing AC / DC hybrid system power flow alternating iterative computation method, so as to solve the problem of power flow computation of the flexible DC-containing AC / DC hybrid system. The method particularly comprises steps: AC / DC hybrid power grid line and node parameters are acquired, wherein the type and the parameter of a connected transformer valve-side virtual node are determined by a corresponding converter control mode and a set value; DC power flow computation is carried out, and if a DC variable crosses a border, a corresponding column of a DCJacobian matrix is removed; a DC power flow computation result is used to correct the absorption or injection power of the virtual node, AC power flow computation is carried out, and the obtained connected transformer valve-side virtual node and AC bus voltage are used as known quantities for next DC power flow iteration; and whether AC and DC power flows are converged is judged, whether the control angle of the converter and the angular phase difference between virtual node and converter AC bus voltage are smaller than computation precision is judged, if yes, convergence is carried out and operation is exited, or otherwise, DC power flow computation is returned.
Owner:GUANGDONG POWER GRID CO LTD SHANTOU POWER SUPPLY BUREAU
Newton-Raphson and forward pushing coordinated flow algorithm for transmission and distribution network comprising distributed power supply
InactiveCN105470955AResolve imprecisionReduce the difficulty of solvingData processing applicationsAc network circuit arrangementsParallel computingElectric distribution network
The present invention discloses a Newton-Raphson and forward pushing coordinated flow algorithm for a transmission and distribution network comprising a distributed power supply. The algorithm comprises the following steps of: (1) inputting an original parameter of the transmission and distribution network; (2) initializing an amplitude and a phase angle of each node voltage; (3) setting the number of iterations of flow calculation as 1; (4) calculating a distribution network flow by using a forward pushing back substitution algorithm to obtain an impregnation power of an edge node of a distribution network; (5) calculating a transmission network flow by using a Newton-Raphson algorithm to obtain each node voltage of a transmission network; (6) determining whether a voltage difference of the edge node in each two adjacent iterations is smaller than a set convergence value, if the voltage difference is smaller than the set convergence value, then coordinating flow iteration convergence, and turning to the step (7), or turning to the step (4) to continue iteration and setting k=k+1; (7) outputting a calculating result. According to the Newton-Raphson and forward pushing coordinated flow algorithm for the transmission and distribution network comprising the distributed power supply, the Newton-Raphson algorithm and forward pushing back substitution algorithm are integrated into the coordinated flow computation, a coordinated flow solution of the transmission and distribution network comprising the distributed power supply can be accurately solved.
Owner:STATE GRID CORP OF CHINA +4
Task flow computation model
InactiveCN101408850AAccurate expressionIn-depth portrayalMultiprogramming arrangementsCost effectivenessTheoretical computer science
The invention discloses a task-flow computational model applicable to a reconfigurable high-performance computer system. A form of Five-Tuple Array (T, R, SC, EC, TS) represents the way for solving a problem under the mode of task-flow, wherein, T is a finite set of tasks, R is a relation set among tasks, SC is a starting condition set of tasks, EC is a terminal condition set of tasks and TS is a finite sequence set of tasks. On a premise of no restriction by factors such as resources, the preferred plan for solving problems is possibly used as a drag, the grain size of soft and hard task are reasonably divided, the system is restructured according to problems and requirements of task and high cost-effectiveness and high utilization rate are achieved. The task-flow computational model processes tasks as a basic unit, provides the definition of task-flow, the division principles of tasks as well as various forms of task-flow. The model can be used for the parallelism depiction of different grain sizes and lays a foundation for accurately and clearly dividing tasks and depicting task-flow oriented reconfigurable high-performance computation.
Owner:THE PLA INFORMATION ENG UNIV
Method for calculating flow of mudslide behind dam and application thereof
ActiveCN107423484AGuarantee the effect of disaster prevention and mitigationAccurate calculationGeometric CADClimate change adaptationStress factorComputer science
The invention discloses a method for calculating flow of mudslide behind a dam and application thereof, belonging to the field of mudslide prevention and control projects. The method comprises the following steps of a. obtaining incoming mudslide total W and mudslide peak flow Q through hydrologic calculation, and investigating on the side to determine a storage capacity C of the dam, a yield stress Tau of the mudslide, a volume weight Rho of the mudslide and a characteristic particle size D<90> of mudslide; and b. calculating the flow Q of mudslide behind the dam according to the incoming mudslide total W, the mudslide peak flow Q, the storage capacity C of the dam, the yield stress Tau of the mudslide, the volume weight Rho of the mudslide, the characteristic particle size D<90> of mudslide, and a dimensionless yield stress factor Tau*. The method is applicable to outdoor large scale actual calculation, can calculate the flow of the mudslide behind the dam accurately, provides reliable data reference for the mudslide prevention and control project, and ensures disaster prevention and mitigation effects in mudslide regions.
Owner:CHENGDU UNIVERSITY OF TECHNOLOGY
Method for calculating lake and reservoir inflow flow of rivers
ActiveCN107679021AImprove time resolutionImprove spatial resolutionGeographical information databasesComplex mathematical operationsHydrometryRainfall runoff
The invention relates to a method for calculating lake and reservoir inflow flow of rivers. The method comprises the following steps: collecting hydrological data and meteorological data of main lakeand reservoir inflow riverways, calculating correlation coefficients of river section flow and different rainfall time lengths, selecting a rainfall time length T that is significantly correlated withthe section flow, establishing a total rainfall relational expression of representative river section flow and the selected rainfall time length T, calculating the water yield of total rainfall of aunit area within the rainfall time length, and then calculating the day-to-day lake and reservoir inflow flow of the riverways by using drainage basin catchment basin areas. The flow calculation method provided by the invention further comprises: adjusting the rainfall runoff coefficient of the unit area involved in the calculation based on the principle of water balance so as to improve the harmony of flow and water level data. As the method provided by the invention is used for calculating the lake and reservoir inflow flow of rivers, the time and space resolution of lake and reservoir inflow water yield is improved, and a foundation is laid for the calculation and estimation of the lake inflow pollution flux of the main riverways of lakes and reservoirs.
Owner:NANJING INST OF GEOGRAPHY & LIMNOLOGY
Distributed system for performing machine learning on data record and method thereof
ActiveCN107679625ATo achieve homogenizationReduce transmission overheadComputing modelsMachine learningData records
The invention provides a distributed system for performing machine learning on data record and a method thereof. The system comprises multiple computing devices of which each performs the same data flow computation about machine learning on its own data record; and a parameter server which is used for maintaining the parameters of a machine learning model, wherein when data flow computation for training the machine learning model is performed, the computing devices use the parameters acquired from the parameter server to perform the same operation about machine learning model training on the respective data record, and the parameter server updates the parameters according to the operation result of the computing devices; besides / or when data flow computation for estimation through the machine learning model is performed, the computing devices use the parameters acquired from the parameter server to perform the same operation about machine learning model estimation on the respective data record. Therefore, homogenization between the computing devices can be realized and the network transmission overhead can be reduced.
Owner:THE FOURTH PARADIGM BEIJING TECH CO LTD
Clamp-on ultrasonic flow rate measuring device having automatic pipe thickness measuring function
InactiveUS20170153136A1Accurate measurementVolume/mass flow measurementUsing subsonic/sonic/ultrasonic vibration meansUltrasonic sensorMeasurement device
Owner:JAIN TECH
Steam turbine flow characteristic optimization method based on full-stroke modeling
ActiveCN111505943AFlow control using electric meansMachines/enginesMathematical modelFunction optimization
The invention provides a steam turbine flow characteristic optimization method based on full-stroke modeling. The method is based on an improved turbine high control valve flow characteristic test. Anactual flow calculation method is provided, a filtering technology and a clustering algorithm are applied, a full-stroke mathematical model of a turbine flow instruction, a control valve opening degree and actual flow is established by means of a piecewise linear function, and an accurate theoretical basis is provided for turbine high control valve flow characteristic function optimization, overlapping degree adjustment, valve sequence modification and the like. The method has the advantages that the full-stroke flow characteristic model within the total instruction range of (0-100)% flow canbe accurately established, and on the basis, optimization within the total instruction range is achieved. Through repeated test verification and operation effect display after optimization of multiple units, the turbine flow characteristic function optimization method based on flow total instruction full-stroke modeling has a good effect in practical application.
Owner:GUODIAN SCI & TECH RES INST
Method and System for Non-Invasive Functional Assessment of Coronary Artery Stenosis Using Flow Computations in Diseased and Hypothetical Normal Anatomical Models
A method and system for non-invasive assessment of coronary artery stenosis is disclosed. A patient-specific real anatomical model of a diseased coronary artery of a patient is generated from medical image data of the patient. A hypothetical normal anatomical model is generated for the diseased coronary artery of the patient. Blood flow is simulated in each of the patient-specific real anatomical model of the diseased coronary and the hypothetical normal anatomical model for the diseased coronary artery. A hemodynamic index is calculated using simulated blood flow rates in the patient-specific real anatomical model of the diseased coronary and the hypothetical normal anatomical model for the diseased coronary artery. In particular, fractional flow reserve (FFR) for the diseased coronary artery is calculated as the ratio of the simulated blood flow rate in the patient-specific real anatomical model of the diseased coronary artery and the simulated blood flow rate in the hypothetical normal anatomical model for the diseased coronary artery.
Owner:SIEMENS HEATHCARE GMBH
Multivariable mass flow rate transmitter system and flow rate setting tool
ActiveUS20070244654A1Good usable flow rate setting toolEasy to set upElectric signal transmission systemsVolume/mass flow measurementEngineeringStreamflow
A system includes a multivariable mass flow rate transmitter having a mass flow rate computation section, and a flow rate setting tool which performs setup of the mass flow rate computation section, the flow rate setting tool including a parameter generation section which generates operational parameters of the mass flow rate computation section, a condition input section for inputting a diagnosing condition, an interface section which transmits the operational parameters to the transmitter, and receives a computation result of the mass flow rate computation section, a model computation section which calculates a mass flow rate value based on the diagnosing condition, a first mass flow rate display section which displays an output value of the model computation section, a second mass flow rate display section which displays the computation result, and a diagnosing display screen which displays the first and second mass flow rate display sections on the same screen.
Owner:YOKOGAWA ELECTRIC CORP
Evaluation method of influence mechanism of sizes of DEM grid units to catchment area extraction
InactiveCN107103088ADesign optimisation/simulationGeographical information databasesWater flowAnalysis tools
The invention discloses an evaluation method of an influence mechanism of the sizes of DEM grid units to catchment area extraction. A catchment area is a basic unit of distributed hydrological surface water logging simulation, and different divisions of the catchment area have an important influence on storm water logging simulation results. When a hydrological analysis tool is used for researched area and water logging area extraction and the sizes of the DEM grid units are different, the four key links, including flow direction extraction, flow calculation, water flow length calculation and drainage basin segmentation, of catchment area extraction are conducted, each step changes, the steps influence one another, and finally influences in different degrees are generated on catchment area extraction. According to the method, the grid units with different sizes are used, and the flow direction, the flow accumulation amount, the water flow length and the changes degree of the drainage basin segmentation under different sizes of the grid units are analyzed, so that evaluation of the influence degrees of the flow direction, the flow accumulation amount, the water flow length and the drainage basin segmentation on catchement area extraction under the condition that the sizes of the grid units are different is achieved.
Owner:NANJING UNIV OF INFORMATION SCI & TECH
Optimizing computation of minimum cut in graphs with grid topology
InactiveUS20130060724A1Reduce memory bandwidth bottleneckAvoid delayKnowledge representationSpecial data processing applicationsGraphicsNODAL
Approaches for optimizing computation of minimum cut or maximum flow on graphs comprising a plurality of nodes and edges with grid-like topologies are disclosed. Embodiments exploit the regular structure of input graphs to reduce the memory bandwidth—a main bottleneck of popular max-flow / min-cut algorithms based on finding augmenting paths on a residual graph (such as Ford-Fulkerson [1956] or Boykov-Kolmogorov [2004]). Disclosed embodiments allow more than 200% speed-up without sacrificing optimality of the final solution, which is crucial for many computer vision and graphics applications. Method and system embodiments replace standard linked list representation of general graphs with a set of compact data structures with blocked memory layout that enables fixed ordering of edges and implicit branchless addressing of nodes. The embodiments are orthogonal to other optimizations such as parallel processing or hierarchical methods and can be readily plugged into existing min-cut / max-flow computation systems to further improve their performance.
Owner:CZECH TECHN UNIV & PRAGUE FACULTY OF ELECTRICAL ENG
Method and system for testing flow of homogeneous gas-liquid mixed two-phase flow based on ERT
ActiveCN110108331AHigh measurement accuracyImprove real-time performanceVolume/mass flow by electric/magnetic effectsData acquisitionEngineering
The invention provides a method and system for testing flow of a homogeneous gas-liquid mixed two-phase flow based on an ERT. The method solves the problem of measuring gas-liquid flow when the homogeneous gas-liquid mixed two-phase flow is not separated; the method includes the following implementation steps that double-layer temperature control pipes and vacuum treatment between pipes are designed; the flow rate of a gas-liquid two-phase flow is measured, voltage data are collected; a flow map of a two-phase flow is reconstructed by a RBF neural network and a gas-liquid mixed ratio is computed, and flow results of gas and liquid are output. The system includes a sensor unit with double-layer temperature control vacuum pipes, a data collection and treatment unit, an image reconstruction unit and a flow computation unit; an air jet is installed on the wall of an external pipe in the sensor unit, temperature and pressure sensors are correspondingly installed on the front and rear part of an electrode array, and the electrode array is installed around an internal pipe for one circle in an equal-interval mode. According to the method and system for testing the flow of the homogeneousgas-liquid mixed two-phase flow based on the ERT, the two-phase flow does not need to be separated, and the protection for medium is achieved; system construction is simple, measuring accuracy is high, and the real-time ability is high; and the system is used under the conditions of low temperature and high speed, and used for measuring flow and leakage volume in the field of aerospace, energy andpetrochemical industry.
Owner:XIDIAN UNIV
Who we serve
- R&D Engineer
- R&D Manager
- IP Professional
Why Patsnap Eureka
- Industry Leading Data Capabilities
- Powerful AI technology
- Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.
© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com