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49results about How to "Flexible modeling" patented technology
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Car-track-bridge-foundation coupling system and dynamic analysis method thereof
InactiveCN103150458AFlexible modelingImprove good performanceSpecial data processing applicationsStructure of the EarthSimulation
The invention relates to a car-track-bridge-foundation coupling system. A pre-processing module is realized through an MATLAB car structure module and an MATLAB track irregularity sample curve module. A track-bridge-foundation module is realized based on general finite-element software and comprises a track structure model, a track-bridge dynamic interaction model, a bridge structure model, a soil-structure dynamic interaction model and a foundation model. A solving module is realized through an MATLAB wheel-rail dynamic contact calculation module, an MATLAB car system dynamic calculation module and an MATLAB track-bridge-foundation system dynamic calculation module, wherein the MATLAB wheel-rail dynamic contact calculation module is simulated through a track dynamic contact model. A post-processing module is realized through an MATLAB calculation data storage and graphic processing module. Therefore, the car-track-bridge-foundation coupling system is formed.
Owner:CENT SOUTH UNIV +1
Simulation evaluation method for access of distributed power source to power distribution network
InactiveCN104077494AAccess to the evaluation system and improveFlexible modelingSingle network parallel feeding arrangementsSpecial data processing applicationsIndex systemTidal current
The invention provides a simulation evaluation method for access of a distributed power source to a power distribution network. The simulation evaluation method comprises the steps that a power distribution network topology model is established; a current result of the power distribution network is calculated; simulation evaluation of access of the distributed power source to the power distribution network is conducted. According to the simulation evaluation method for the access of the distributed power source to the power distribution network, through establishment of the power distribution network topology model containing the distributed power source, current information of a whole system is calculated; through a constructed evaluation index system for access of the distributed power source to the power distribution network, an index weight evaluation method is adopted to score the influence of access of the distributed power source on the power distribution network, and a result can provided guide suggestions for access of the distributed power source.
Owner:STATE GRID CORP OF CHINA +2
Deformable context coding network model and liver and liver tumor segmentation method
ActiveCN112184748AFast convergenceEfficient extractionImage enhancementImage analysisNetwork modelComputer vision
The invention discloses a deformable context coding network model and a liver and liver tumor segmentation method, which can accurately determine the contour positions of a liver and a liver tumor, realize more accurate liver and liver tumor segmentation, have a wide application prospect, and are suitable for popularization and application. According to the network model of the invention, deformable convolution is utilized to enhance the feature representation capability of a traditional encoder, help the traditional encoder to learn a convolution kernel with adaptive spatial structure information, and eliminate interference of different sizes of liver tumor positions; according to the method, the global feature information in the image is coded by using the Ladder spatial pyramid poolingmodule for extracting the multi-scale context information, so that the contour positions of the liver and the liver tumor are determined more accurately, more accurate liver and liver tumor segmentation is realized, and the method has a wide application prospect.
Owner:SHAANXI UNIV OF SCI & TECH
Microwave passive circuit electromagnetic heat integral analysis method based on time domain spectrum element method
ActiveCN104050307AGood mannersQuickly obtain temperature distributionSpecial data processing applicationsMaxwell's equationsEngineering
The invention discloses a microwave passive circuit electromagnetic heat integral analysis method based on a spectrum element method. According to the method, firstly, a time domain spectrum element method is adopted for solving maxwell's equations, the instantaneous electric field and magnetic field distribution of a circuit under the effect of high-power pulses is worked out, and the electromagnetic loss at the current moment is obtained. If all of the electromagnetic loss inside a mold is converted into heat energy, the obtained heat energy is substituted into a heat conduction equation, and the temperature distribution conditions of each point at the current moment are obtained. Electricity characteristic parameters of materials at a next moment are obtained by utilizing a relational expression of dielectric parameters along with the temperature change, an electromagnetic field equation is calculated again, and the electromagnetic loss is obtained. The operation is repeatedly cycled in such a way until the preset heating time is completed. Through the electromagnetic heat integral analysis, the distribution condition of the temperature inside the mold along the time change when a filter receives the effect of different pulses can be clearly obtained, the modeling is flexible, the subdivision is convenient, formed matrixes have good sparsity, and the solving efficiency is higher.
Owner:NANJING UNIV OF SCI & TECH
Rocket-spacecraft coupling multibody system dynamics calculation test method and system
ActiveCN109656149AFast and accurate coupled dynamic responseSimulate the realSimulator controlEngineeringRocket
The invention provides a rocket-spacecraft coupling multibody system dynamics calculation test method and system. The method comprises steps that physical mechanics model transformation and topological structure construction are performed; transfer matrixes and transfer equations of various components are established, a topological structure and supplementary conditions are utilized, a total transfer matrix and a total transfer equation of the system are obtained through assembling, the system is decoupled through proving orthogonality analysis, the modal analysis theory is utilized to analyzerocket-spacecraft coupling dynamics characteristics, and inherent characteristics of the system are obtained; according to the inherent characteristics of the system, rocket-spacecraft coupling dynamics response calculation is performed; through simulation calculation, the rocket-spacecraft connected interface force condition is obtained, the force spectrum input conditions of force limit controlare obtained, and the force limit test is performed. The method is advantaged in that the rocket-spacecraft coupling dynamics response is quickly and accurately obtained, the rocket-spacecraft interface force spectrum is obtained, the input conditions of the force limit vibration test is obtained, and the force limit vibration test can be quickly and accurately verified.
Owner:SHANGHAI INST OF SATELLITE EQUIP
Method and computer system for scattered beam correction in a multi-source CT
InactiveCN102648857AAvoid ambiguityFlexible modelingReconstruction from projectionMaterial analysis using wave/particle radiationPhysicsCt examination
A method and a computer system (10) are disclosed for scattered beam correction in a CT examination of an object in a multi source CT. In at least one embodiment, the method includes generating original projection data records; reconstruction of the object (P) with the original projection data records of at least one detector (3,5); determining the scattered radiation generated by each emitter (2,4) exclusively in the direction of the original beams of the at least one other emitter relative to its opposing detector (3,5); generating corrected projection data records by removing the calculated scattered radiation from the original projection data records; reconstruction of the object (P) with the corrected projection data records, and implementing a further iteration of the method when determining the scattered radiation or issuing the reconstruction result if at least one predetermined abort criterion applies.
Owner:SIEMENS HEALTHCARE GMBH
Multi-grid precondition method for fast acquiring complex target radar echoes
ActiveCN103279612AFast constructionFast convergenceSpecial data processing applicationsTarget surfaceRadar
The invention discloses a multi-grid precondition method for fast acquiring complex target radar echoes. The method includes: modeling a target, and using coarse triangular grids to subdivide the surface of the target; subdividing the coarse grids to obtain nested grids, and building RWG basis functions on grid layers; using RWG basis function expansion relations of adjacent grid layers to build a first set of interpolation, limiting operator and coarse grid matrixes, building rotation basis functions at the edges of the grid layers, and using RWG basis function expansion relations of adjacent grid layers to build a second set of interpolation, limiting operator and coarse grid matrixes; and using the multi-grid precondition method to solve equation sets, and using the first set of interpolation, limiting operator and coarse grid matrixes and the second set of interpolation, limiting operator and coarse grid matrixes to accelerate convergence of matrix equation iteration solution. Due to the fact the basis functions are constructed at the edges of the grids, the basis functions are high in modeling precision, two sets of operators are used to accelerate convergence of matrix equation iteration solution, and matrix equation solution can be accelerated evidently.
Owner:NANJING UNIV OF SCI & TECH
Synthetic aperture radar echo simulation method suitable for a plurality of emission signal waveforms
ActiveCN106291489AFlexible modelingRealistic modelingRadio wave reradiation/reflectionTime domainFrequency spectrum
The present invention relates to a synthetic aperture radar echo simulation method suitable for a plurality of emission signal waveforms. The method comprises the following steps: the step 1: setting radar emission signal waveform; the step 2: respectively performing the Fourier transform of each radar emission signal, and obtaining the radar emission signal frequency spectrum; the step 3: calculating a synthetic aperture radar transmission function; the step 4: multiplying the radar emission signal frequency spectrum obtained in the step 2 by the synthetic aperture radar transmission function obtained by the step 3, and obtaining the orientation time domain distance frequency domain spectrum of SAR echo signals; and the step 5: performing the inverse Fourier Transform of the obtained result along a distance frequency fr. The synthetic aperture radar echo simulation method suitable for a plurality of emission signal waveforms can flexibly select the emission signal waveform according to the real requirement to allow an SAR echo signal simulator to be more flexible and vivid for the modeling of the radar emission signals; and moreover, the modeling of the emission waveform, the radar work mode, the target scattering feature modeling and the modeling of the radar platform are relatively independent and have no mutual restriction.
Owner:NAT UNIV OF DEFENSE TECH
Method and device for filling level detection in a cylinder of a combustion engine
ActiveCN106460711AIncrease the number ofReduce mistakesElectrical controlMachines/enginesExhaust valveCombustion
The invention relates to a method (10) for filling level detection in a cylinder of a combustion engine, said cylinder being connected to an intake runner via an inlet valve, and to an exhaust channel via an exhaust valve. The method (10) comprises the following steps: providing (102) a database having a data set relating to an amount of a filling component in accordance with an exhaust gas back pressure (pag) in the outlet channel, said step (102) of providing a database involving the provision (100) of measurement data (30) measured on a test bed, and the provision (101) of simulation data (31) calculated using a charge exchange calculation; determining (103) a basic function (20) that qualitatively describes the dependency of the filling component amount on the exhaust gas back pressure (pag); and adapting (104) the basic function (20) to at least the one data set of the database by appropriately selecting variable parameters of the basic function (20).
Owner:VOLKSWAGEN AG
Simulation method and system for twelve-phase brushless direct current motor
InactiveCN108540025AEasy to modifyEasy to handleModelling/simulations for controlPhase currentsMotor speed
The invention discloses a simulation method for a twelve-phase brushless direct current motor. The method comprises the following steps: setting initial parameters of the motor and setting reference rotation speed of the motor; calculating phase current, electromagnetic torque and motor speed of each phase stator winding according to the initial parameters of the motor; acquiring the rotor position of the motor, and calculating the reference current of each phase stator winding according to motor rotating speed, reference rotating speed and rotor position of the motor; obtaining a PWM controlsignal according to the reference current of each phase stator winding and the phase current of each phase stator winding; controlling the ground voltage of each phase stator winding according to thePWM control signal, and recalculating the phase current, electromagnetic torque and motor speed of each phase stator winding; obtaining the phase current waveform, electromagnetic torque waveform andmotor speed waveform of each phase stator winding. The twelve-phase brushless direct current motor is simulated on a simulation platform by simulation software, and waveform simulation and adjustmentof the motor parameters can be better conducted until the required waveforms are obtained, so that the motor parameters meet the motor performance.
Owner:覃世英
Electric-heat integrated analysis method for MESFET under action of high-power electromagnetic pulses
ActiveCN106156388AFlexible modelingEasy to divideSpecial data processing applicationsElectrical field strengthCharge carrier mobility
The invention discloses an electric-heat integrated analysis method for a MESFET under the action of high-power electromagnetic pulses. The method comprises the steps that a drifting-diffusing equation set is solved by taking the electronic quasi Fermi potential, the hole quasi Fermi potential and the electric potential as variables and adopting a time domain spectral-element method to solve the instaneous quasi Fermi potential and electric potential of the metal-semiconductor field effect tube (MESFET) under the action of the high-power pulses, and then the electric field intensity and the current density at the moment are obtained; temperature distribution of all positions at the moment can be obtained under the action of a joule heat source by considering the influences of ambient environment temperature and heat convection; the carrier mobility and the generation-recombination rate are updated according to temperature changes, electric field distribution is recalculated, the steps are repeatedly conducted until the drifting-diffusing equation set meets the convergence precision, and electric field distribution and heat distribution at the moment are to-be-solved electric-heat distribution inside the MESFET at the moment. The method is achieved on the basis of a MESFET physical model, and the distribution conditions, changing along with time, of an electric field and the temperature in a device under the action of the high-power electromagnetic pulses can be clearly obtained.
Owner:NANJING UNIV OF SCI & TECH
MOSFET electric heating integrated analysis method under high power electromagnetic pulse effect
ActiveCN105699871AQuickly obtain temperature distributionFlexible modelingIndividual semiconductor device testingMOSFETElectrical field strength
The invention discloses an integrated analysis method of MOSFET electrothermal under the action of high-power electromagnetic pulse. This method first uses the time-domain spectral element method to solve the drift-diffusion equations, and obtains the instantaneous carrier concentration and potential distribution of the MOSFET under the action of high-power pulses, and obtains the electric field strength and current density at the current moment. Assuming that the heat source inside the model is only Joule heat source, considering the influence of ambient temperature and thermal convection, the temperature distribution of each point at the current moment is obtained. Electric field parameters such as carrier mobility are updated according to temperature changes. This cycle is repeated until the drift-diffusion equations meet the convergence accuracy, and the electric field distribution and heat distribution at this time are the required electric heat distribution inside the MOSFET at the current moment. This analysis method has extremely important practical significance for researching semiconductor devices such as MOSFET against high power destruction.
Owner:NANJING UNIV OF SCI & TECH
Simulation method for electromagnetic problem containing nonlinear dispersive medium
PendingCN114781202AFlexible modelingEasy to divideDesign optimisation/simulationSpecial data processing applicationsTime domainGeometric modeling
The invention discloses a simulation method for an electromagnetic problem containing a nonlinear dispersive medium, which comprises the following steps of: establishing a geometric model of a medium according to the geometric size of the medium of a device, subdividing the model by adopting a hexahedron unit, acquiring the geometric information of the device and setting the position information of an excitation source; performing region division on the subdivided geometric model according to the kernel number of the parallel parameters; and establishing a differential equation set by adopting a time domain discontinuous Galerkin finite element method, and solving any dispersion model and a nonlinear dispersive medium model in the geometric model of the medium. According to the method, on the basis of the time domain discontinuous Galerkin finite element, by combining the local time stepping and parallel technology, modeling of a complex medium and electromagnetic characteristic analysis of a nonlinear dispersive medium can be achieved; due to the fact that the time domain discontinuous Galerkin finite element method has the advantages of being high in precision and flexible in modeling, an inverse matrix can be directly obtained, and due to the fact that local time stepping and parallel technologies are added, the calculation time can be greatly shortened.
Owner:NANJING UNIV OF SCI & TECH
Mould frame for prefabricated laminated plate casting and mould for prefabricated laminated plate casting
The invention provides a mould frame for prefabricated laminated plate casting and a mould for prefabricated laminated plate casting. The mould frame for prefabricated laminated plate casting works ona casting mould table to fix a reinforcement mesh formed by welding or binding of a plurality of reinforcement segments, a bottom frame fixed to the casting mould table through a positioning mechanism and a top frame detachably connected with the bottom frame are included, the bottom frame is provided with a fixture of a clamping groove for the ends of the reinforcement segments to penetrate through, and the fixture is elastically deformed due to extrusion of the top frame and the bottom frame to form clamping on the ends of the reinforcement segments. According to the mould frame for prefabricated laminated plate casting, the positioning mechanism is provided with a positioning rod by sliding on the bottom frame, a magnetic part is arranged on the positioning rod, and then the magnetic part can be separated from the bottom frame and adsorbed on the casting mould table by tapping the positioning rod.
Owner:HANDAN SHUGUANG NEW BUILDING MATERIAL TECH
Adaptive radiation dose calculation simulation method for irregular shaped radioactive source
ActiveCN108491583AGuaranteed calculation accuracyReduce the number of coresDesign optimisation/simulationSpecial data processing applicationsDose calculationNuclear facilities
The present invention discloses an adaptive radiation dose calculation simulation method for an irregular shaped radioactive source, and belongs to the field of nuclear facility decommissioning simulation. The method comprises: establishing a three-dimensional geometric model of an object in three-dimensional modeling software and deriving the three-dimensional geometric model as initial input; reading a three-dimensional model file of the object, and acquiring a mesh model of the object; performing spatial division; performing approximation on the object model by using a cuboid; taking the overlapping part of the cuboid of the surface of the object and the object to generate an adaptive point nucleus; segmenting the cuboid inside the object to generate an adaptive point nucleus; and usingthe point nucleus method to perform gamma radiation dose calculation. According to the technical scheme of the present invention, the adaptive point nucleus technology is used to improve the calculation efficiency, requirements of the radiation dose calculation time and precision can be satisfied by adjusting the distribution density of the point nucleus according to the position of the detectionpoint, and geometry with any shape can be processed, so that dose evaluation modeling and calculation processes are more flexible and efficient.
Owner:HARBIN ENG UNIV
A Synthetic Aperture Radar Echo Simulation Method Applicable to Various Transmitted Signal Waveforms
ActiveCN106291489BFlexible modelingRealistic modelingRadio wave reradiation/reflectionFrequency spectrumSynthetic aperture radar
The present invention relates to a synthetic aperture radar echo simulation method suitable for a plurality of emission signal waveforms. The method comprises the following steps: the step 1: setting radar emission signal waveform; the step 2: respectively performing the Fourier transform of each radar emission signal, and obtaining the radar emission signal frequency spectrum; the step 3: calculating a synthetic aperture radar transmission function; the step 4: multiplying the radar emission signal frequency spectrum obtained in the step 2 by the synthetic aperture radar transmission function obtained by the step 3, and obtaining the orientation time domain distance frequency domain spectrum of SAR echo signals; and the step 5: performing the inverse Fourier Transform of the obtained result along a distance frequency fr. The synthetic aperture radar echo simulation method suitable for a plurality of emission signal waveforms can flexibly select the emission signal waveform according to the real requirement to allow an SAR echo signal simulator to be more flexible and vivid for the modeling of the radar emission signals; and moreover, the modeling of the emission waveform, the radar work mode, the target scattering feature modeling and the modeling of the radar platform are relatively independent and have no mutual restriction.
Owner:NAT UNIV OF DEFENSE TECH
High-pressure heater modeling method and device and computer device
ActiveCN109670265AFlexible modelingReduce difficultyDesign optimisation/simulationSpecial data processing applicationsObservation pointHigh pressure water
The invention provides a high-pressure heater modeling method and device and a computer device. The high-pressure heater modeling method comprises the steps of obtaining the structural information ofa high-pressure heater and the state data of a preset observation point during operation; establishing a drainage flow model, a shell side pressure model and a water level calculation model of the high-pressure water heater by utilizing the state data of a preset observation point, the structure information of the high-pressure heater and a preset modeling calculation equation; and carrying out hybrid modeling by utilizing the drainage flow model, the shell side pressure model and the water level calculation model to generate a high-pressure heater model. Preferably, the state data comprises steam state data, hydrophobic state data, water supply state data and shell side state data. According to the modeling method for the high-pressure heater, the high-pressure heater model is generated by utilizing a plurality of model combinations through a hybrid modeling method, so that the modeling process of the high-pressure heater is more flexible, the modeling difficulty of the high-pressureheater is reduced, and the modeling cost of the high-pressure heater is reduced.
Owner:华润电力技术研究院有限公司
Space traveling wave tube reliability evaluation method based on multi-source data fusion
ActiveCN111400856AUpdate Reliability Assessment ResultsRealize operational reliability assessmentDesign optimisation/simulationAlgorithmEngineering
The invention discloses a space traveling wave tube reliability evaluation method based on multi-source data fusion. The method comprises the following steps: S1, processing acquired data and extracting features; S2, calculating an edge probability of a bottom layer input node of an established Bayesian network model according to a result obtained in the step S1; S3, calculating edge probabilitiesof input nodes of other layers of the Bayesian network model according to the edge probabilities of the bottom layer input nodes obtained in the step S2; and S4, calculating a reliability point estimation result of the traveling wave tube according to the calculation result obtained in the step S3 and the Bayesian network model of the traveling wave tube. According to the invention, while staticreliability evaluation is carried out on the product, real-time on-orbit telemetry data can also be utilized to realize operation reliability evaluation on the traveling wave tube, and the result canbe used as an important basis for the working state and on-orbit health management of a satellite key single machine.
Owner:INST OF ELECTRONICS CHINESE ACAD OF SCI +1
A three-dimensional virtual maintenance simulation model construction method based on an operation unit
ActiveCN109933810AImprove reusabilityAchieve data matchingSpecial data processing applications3D modellingNODALCoupling
The invention provides a three-dimensional virtual maintenance simulation model construction method based on an operation unit. The creation of a maintenance flow simulation model, the construction ofan operation unit model and the construction of a maintenance task simulation model are completed in sequence. According to the invention, the maintenance task operation is decomposed into the minimization of the non-redivisible disassembly and assembly units, namely the operation units, only the motion information of the basic maintenance operation is contained, the operation units are managed in a discrete manner, and the operation units have no association relationship and exist independently. The operation units are made to correspond to the digital prototype model and the maintenance task flow nodes by defining the incidence relation, the operation units can be combined according to the maintenance task flow, when the same node exists in the maintenance task flow, the operation unitscan be directly reused, and maintenance simulation models with different layer granularities are generated. Thus, low-coupling and high-aggregation data association is used for achieving flexible andrapid construction of the three-dimensional virtual maintenance simulation, the workload is reduced, and the three-dimensional virtual maintenance simulation construction efficiency is greatly improved.
Owner:CHENGDU AIRCRAFT DESIGN INST OF AVIATION IND CORP OF CHINA
Electric field analysis method of electromagnetic pulse nano-semiconductor device
ActiveCN109543205ASolve problems of different sizesFlexible modelingDesign optimisation/simulationSpecial data processing applicationsDevice materialElectromagnetic pulse
The invention discloses an electric field analysis method of an electromagnetic pulse nano semiconductor device. The steps of the method are as follows: in the first step, the solution model of MOSFETis established, and the model is divided by using the curved hexahedrons to obtain the structural information of the model, including the element information and node information of the hexahedron; in the second step, starting from the carrier current continuity equation, Poisson equation and carrier quantum correction equation, the backward Euler time difference is used firstly, then the discontinuous Galerkin method is used to test the equation, and the electric field boundary condition is imposed to obtain the electric field and current distribution of each node. On the premise of the samecalculation amount, Under the action of electromagnetic pulse and voltage, the distribution of the internal electric field with time can be obtained more clearly, which can reduce the computational load when the convergence accuracy is the same. In addition, the method has the advantages of flexible modeling and convenient dissection, and the formed matrix has good sparsity and high efficiency ofsolution.
Owner:NANJING UNIV OF SCI & TECH
Long sequence prediction method for key production variables in polyester fiber polymerization process
PendingCN119673301AAchieving Precise ForecastingImprove forecast accuracyChemical processes analysis/designBiological modelsPolyesterFiber
The invention relates to a long-sequence prediction method for key production variables in a polyester fiber polymerization process, and the method comprises the steps: inputting the historical data of a certain time length of a plurality of key production variables in the polyester fiber polymerization process into a proposed time anchor network model, and outputting a predicted value of a future time step of the plurality of key production variables; an encoder of the time anchor point network model is a plurality of time anchor point layers, and each time anchor point layer is formed by connecting a time anchor point sampling module and a graph mask full-connection neural network in series; a decoder of the time anchor network model is a two-layer full-connection neural network. According to the method, modeling is carried out on a multivariable prediction task of an aggregation process from the time scale and spatial correlation, the proposed anchor point sampling-based technology contains the idea of division and treatment, data is subjected to block sampling, different neural networks are adopted to extract features, a time-based anchor point network model is established, and the time-based prediction task of the aggregation process is obtained. The problem of long sequence modeling can be effectively solved, and accurate prediction of key production variables is realized.
Owner:DONGHUA UNIV
Efficient field-circuit co-simulation method based on space mapping technology
PendingCN114692541AAccurate and Efficient FittingImprove efficiencySpecial data processing applicationsCAD numerical modellingTheoretical computer sciencePhysical model
The invention discloses an efficient field-circuit co-simulation method based on a space mapping technology, and provides analysis on an energy selective surface based on a space mapping algorithm, the method mainly introduces a rough model and a fine model, the rough model with high calculation efficiency is used for solving in the solving process, and the calculation efficiency of the fine model is improved. And verifying by using a fine model with low calculation efficiency after solving is completed. According to the method, the rough model is an equivalent circuit model, the fine model is a real physical model, and the result shows that the method not only can keep high accuracy, but also has a remarkable acceleration effect.
Owner:NANJING UNIV OF SCI & TECH
Reservoir dam safety intelligent inspection method and system
PendingCN119624358AImprove inspection efficiencyrelieve pressureChecking time patrolsImage analysisSecure stateMulti source data
The invention relates to the technical field of reservoir dam safety inspection, and discloses a reservoir dam safety intelligent inspection method and system, which comprises an inspection intelligent implementation module, a dam safety non-automatic monitoring data entry intelligent implementation module and a multi-source inspection information safety transmission management module, the inspection intelligent implementation module comprises an inspection planning unit, an inspection result input unit and an inspection result intelligent identification unit, and the dam safety non-automatic monitoring data input intelligent implementation module comprises measured value input task planning, measured value input task execution and safety state measured value intelligent judgment. And the multi-source inspection information security transmission management module has a multi-source data asynchronous transmission function and a multi-source data security management function. Compared with the prior art, scientific transmission and storage of unstructured recorded data of the engineering safety state are promoted, the working efficiency of reservoir dam safety inspection is effectively improved in combination with an artificial intelligence method, and the engineering digital management level is improved.
Owner:HOHAI UNIV +1
Electromagnetic-thermal integrated analysis method of microwave passive circuit based on time-domain spectral element method
ActiveCN104050307BGood mannersQuickly obtain temperature distributionSpecial data processing applicationsHemt circuitsEngineering
The invention discloses a microwave passive circuit electromagnetic heat integral analysis method based on a spectrum element method. According to the method, firstly, a time domain spectrum element method is adopted for solving maxwell's equations, the instantaneous electric field and magnetic field distribution of a circuit under the effect of high-power pulses is worked out, and the electromagnetic loss at the current moment is obtained. If all of the electromagnetic loss inside a mold is converted into heat energy, the obtained heat energy is substituted into a heat conduction equation, and the temperature distribution conditions of each point at the current moment are obtained. Electricity characteristic parameters of materials at a next moment are obtained by utilizing a relational expression of dielectric parameters along with the temperature change, an electromagnetic field equation is calculated again, and the electromagnetic loss is obtained. The operation is repeatedly cycled in such a way until the preset heating time is completed. Through the electromagnetic heat integral analysis, the distribution condition of the temperature inside the mold along the time change when a filter receives the effect of different pulses can be clearly obtained, the modeling is flexible, the subdivision is convenient, formed matrixes have good sparsity, and the solving efficiency is higher.
Owner:NANJING UNIV OF SCI & TECH
Mold frames for pouring prefabricated laminated slabs and molds for pouring prefabricated laminated slabs
The invention provides a mould frame for prefabricated laminated plate casting and a mould for prefabricated laminated plate casting. The mould frame for prefabricated laminated plate casting works ona casting mould table to fix a reinforcement mesh formed by welding or binding of a plurality of reinforcement segments, a bottom frame fixed to the casting mould table through a positioning mechanism and a top frame detachably connected with the bottom frame are included, the bottom frame is provided with a fixture of a clamping groove for the ends of the reinforcement segments to penetrate through, and the fixture is elastically deformed due to extrusion of the top frame and the bottom frame to form clamping on the ends of the reinforcement segments. According to the mould frame for prefabricated laminated plate casting, the positioning mechanism is provided with a positioning rod by sliding on the bottom frame, a magnetic part is arranged on the positioning rod, and then the magnetic part can be separated from the bottom frame and adsorbed on the casting mould table by tapping the positioning rod.
Owner:HANDAN SHUGUANG NEW BUILDING MATERIAL TECH
Electrothermal integration analysis method of mesfet under the action of high power electromagnetic pulse
ActiveCN106156388BFlexible modelingEasy to divideDesign optimisation/simulationElectrical field strengthCharge carrier mobility
Owner:NANJING UNIV OF SCI & TECH
An Adaptive Radiation Dose Calculation Simulation Method for Irregular Shaped Radiation Sources
ActiveCN108491583BGuaranteed calculation accuracyReduce the number of coresDesign optimisation/simulationSpecial data processing applicationsAlgorithmSimulation
The invention discloses an adaptive radiation dose calculation and simulation method for an irregular-shaped radiation source, which belongs to the field of nuclear facility decommissioning simulation. The invention includes establishing a three-dimensional geometric model of an object in three-dimensional modeling software and exporting it as an initial input; reading the three-dimensional model file of the object to obtain a grid model of the object; space division; using a cuboid to approximate the object model; An adaptive point kernel is generated from the overlapping part with the object; an adaptive point kernel is generated from the cuboid segmentation inside the object; the point kernel method is used to calculate the gamma radiation dose. The invention adopts the self-adaptive point kernel technology to improve the calculation efficiency, and can adjust the distribution density of the point kernel according to the position of the detection point to meet the requirements of radiation dose calculation time and accuracy, and can process any shape geometry, so that the modeling of the dose evaluation can be achieved. , The calculation process is more flexible and efficient.
Owner:HARBIN ENG UNIV
A Graph Pattern Matching Method Supporting Fuzzy Constraint Relations
ActiveCN105138601BIncrease practical rangeImprove match qualityStill image data queryingSpecial data processing applicationsData graphUser input
The present invention provides a graph pattern matching method for supporting a fuzzy constraint relation, which relates to the technical field of graph information query and is used for solving the problem, in the prior art, of failing to support matching of a fuzzy constraint relation on the basis of meeting all accurate constraints. The method comprises: by means of an input layer, acquiring a query graph Q input by a user and a stored target data graph G, wherein the query graph contains the accurate constraint relation and the fuzzy constraint relation; by means of an accurate matching layer, performing accurate map matching for the accurate constraint relation in the query graph input by the user in the target data graph, and constructing a guide graph with a merging node in the target data graph; and by means of a fuzzy search layer, finding out and outputting K matching graphs that have the best fuzzy constraint matching quality on the basis of meeting all the accurate constraints in the guide graph. The graph pattern matching method for supporting the fuzzy constraint relation is applicable for performing hybrid query supporting the fuzzy constraint relation and the accurate constraint relation in massive target data graphs.
Owner:INST OF SOFTWARE - CHINESE ACAD OF SCI
Method and device for charge detection in a cylinder of an internal combustion engine
ActiveCN106460711BFlexible modelingReliable modelingElectrical controlMachines/enginesExhaust valveData set
The invention relates to a method (10) for charge detection in a cylinder of an internal combustion engine, wherein the cylinder is connected to an intake manifold via an intake valve and to an exhaust duct via an exhaust valve. The method (10) includes the step of providing (102) a database having information related to the exhaust gas back pressure (p ag ) data sets related to the amount of aeration components, wherein the step of providing (102) the database comprises: providing (100) measurement data (30) measured at the test bench, and providing (101) the calculated by means of ventilation calculations The simulated data (31) of , determine (103) the basic function (20) that qualitatively describes the relationship between the amount of charge components and the exhaust back pressure (p ag ) and adapt (104) the base function (20) to at least one data set of the database by appropriate selection of variable parameters of the base function (20).
Owner:VOLKSWAGEN AG
Multi-physical coupling calculation method for fuel irradiation test based on Monte Carlo and CFD (Computational Fluid Dynamics)
ActiveCN119578280Aimprove accuracyFlexible modelingGeometric CADNuclear energy generationRapid processingGeometric modeling
The invention provides a fuel irradiation test multi-physics coupling calculation method based on Monte Carlo and CFD, relates to the technical field of irradiation coupling calculation, and aims to realize rapid processing and facilitate interface development and data processing of a subsequent multi-physics field program, and comprises the following steps: carrying out irradiation device modeling based on reactor internals and a fuel irradiation test object; lattice cell grid mapping is carried out, and intersections of different partition spaces of the CSG geometric structure of the fuel irradiation test object and the CFD geometric model are obtained; establishing a coupling model to obtain an external interface module; and carrying out key parameter iteration. The method has the advantages of high processing efficiency, high applicability and convenience in interface development and data processing of subsequent multi-physical field programs.
Owner:NUCLEAR POWER INSTITUTE OF CHINA