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79 results about "Multiphysics" patented technology
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Multiphysics is defined as the coupled processes or systems involving more than one simultaneously occurring physical fields and the studies of and knowledge about these processes and systems. As an interdisciplinary study area, multiphysics spans over many science and engineering disciplines. Multiphysics is a practice built on mathematics, physics, application, and numerical analysis. The mathematics involved usually contains partial differential equations and tensor analysis. The physics refers to common types of physical processes, e.g., heat transfer (thermo-), pore water movement (hydro-), concentration field (concentro or diffuso/convecto/advecto), stress and strain (mechano-), dynamics (dyno-), chemical reactions (chemo- or chemico-), electrostatics (electro-), and magnetostatics (magneto-).
Test system and test method of multiphysics fatigue property
InactiveCN101614635AImplement fatigue performance testingAchieve lifeMaterial analysis using acoustic emission techniquesStrength propertiesElectricitySmall sample
Owner:SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
Microwave thermal ablation temperature field simulation method based on characteristic parameter feedback
ActiveCN107526928ASolve the problem of not being able to perform specific analysis on parametersThe temperature field distribution conforms toSpecial data processing applicationsMicrowaveMultiphysics
The invention discloses a microwave thermal ablation temperature field simulation method based on characteristic parameter feedback. The method comprises the steps that preset initial conditions and boundary conditions are set in COMSOL Multiphysics software, and a microwave thermal ablation temperature field simulation model is established; sensitivity analysis is performed on body model organization characteristic parameters based on the simulation model; a microwave thermal ablation experiment is executed, a temperature measurement probe is utilized to perform actual measurement on seven points in an ablation region, and actually measured temperature is obtained; a precise representation form of the characteristic parameters is obtained by use of actually measured data of a feedback probe based on a parameter sensitivity analysis result; and temperature field simulation is performed by use of the precise representation form of the characteristic parameters, and the characteristic parameters are compared with the actually measured data to verify the precision of a temperature field distribution model. By the adoption of the technical scheme, the problem that in the prior art, temperature field distribution cannot be obtained precisely due to uncertainty of the organization characteristic parameters is solved.
Owner:真健康(珠海)医疗科技有限公司
Temperature field simulated analysis method applied to multi-disk dry brake under comprehensive action of multiple physical fields
InactiveCN105956264ASimplify the difficulty of operationReduced simulation timeGeometric CADSpecial data processing applicationsSolid regionHeat flux
The invention discloses a temperature field simulated analysis method applied to a multi-disk dry brake under the comprehensive action of multiple physical fields. Firstly, a three-dimensional model of the brake is established by starting from the mechanism and movement principle of the multi-disk dry brake. Then according to the complementarity between a fluid field and the brake structure, a rough fluid model is established and then modified and cut, and thus a final fluid model is acquired. Then fluid region and solid region boundary conditions are computed, a heat-flux coupling analysis is performed, and a temperature distribution rule of the whole brake is acquired. At last, a thermo-solid coupling analysis is performed, and a temperature field-to-brake structure deformation parameter is acquired. The temperature field simulated analysis method can achieve the temperature field simulated analysis of the multi-disk dry brake under the comprehensive action of multiple physical fields, is more accurate and reliable than the traditional single temperature field analysis, adopts zonal solving and boundary coupling methods, thus optimizing the information flow among the physical fields, and thus, the simulation is simpler, the operation is convenient and the consumed time is greatly shortened.
Owner:LIAONING INST OF SCI & TECH +1
Superconducting magnet generating rotating magnetic field
ActiveCN101794653ACompact structureImprove utilization efficiencyInductances/transformers/magnets manufactureSuperconducting magnets/coilsSuperconducting CoilsMultiphysics
The invention provides a superconducting magnet structure with high magnetic field, large homogeneity range and rotating magnetic field. In the structure, a superconductive main coil (4) in the z-axis direction supplies a strong background magnetic field, and a Helmoltz coil pair (3) in the z-axis direction supplies a magnetic field of z-axis direction changes; a racetrack-shaped superconductive coil pair (5) supplies the magnetic field of the x direction; and a racetrack-shaped superconductive coil pair (6) in the y direction supplies the magnetic field of y direction changes. The current amplitude and the current direction of the coils in the directions of x, y and z can be controlled through a computer so that the required rotating magnetic field is obtained in the center of the superconducting magnet. The superconducting magnet system is used in occasions for studying physical characteristics, such as materials, magnetic-optic effect and the like under the combined action of a multiphysics field and under an extreme condition.
Owner:INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
Power transmission tower structural mechanical analysis and App (Application) establishment method
InactiveCN108536912ALower barriers to useAchieve specializationDesign optimisation/simulationSpecial data processing applicationsCloud atlasSimulation
The invention discloses a power transmission tower structural mechanical analysis and App (Application) establishment method which comprises the following steps: on the basis of COMSOL Multiphysics software, modeling according to a structure of a power transmission tower and a cross section and a material of a rod, applying external loads such as self weights, wind and ice loads of power transmission towers, leads and insulators, performing stress analysis on the power transmission tower, and generating stress cloud atlas, deformation cloud atlas and result reports; secondly, through an App developer inside the software, designing an App of power transmission tower structure stress analysis by using a form editor and a method editor. The method can be widely applied to finite element modeling and structure stress analysis on a power transmission tower, and by using the App established simultaneously, non-professional operators without skills of finite element modeling and simulation analysis can be enabled to obtain calculation results by rapidly modifying parameters of models.
Owner:SOUTH CHINA UNIV OF TECH
Method for confirming stress distribution for Y-shaped ventilation gob stratum
InactiveCN103809214APrecise positioningAccurate measurement of formation stress distributionPermeability/surface area analysisGeological measurementsStress distributionMultiphysics
The invention discloses a method for confirming stress distribution for Y-shaped ventilation gob stratum, and the method belongs to the gas extraction field, the method comprises the steps of doing the coal containing methane heat-fluid-solid coupling triaxial seepage test according to the working conditions on site to obtain the permeability of the coal sample during the stress-strain process, building the active volume stress intensity equation for coal, the coal stress balanced equation, geometric equation for coal containing methane and elastoplastic constitutive equation, importing the Comsol Multiphysics system and inputting the corresponding stratum material parameter to obtain the stress distribution result of the stratum through the iterative operation. The method can measure the stress distribution of the stratum for the Y-shaped ventilation gob more accurately, locate the enrichment region for Y-shaped ventilation gob more accurately and provide more specific guide for the drilling distribution during the gas extraction.
Owner:CHONGQING UNIV
Electromagnetic valve performance analysis method based on multi-physical field optimization
ActiveCN110852014AAccurate calculationAvoid calculation errorsGeometric CADDesign optimisation/simulationComputational electromagnetismMathematical model
The invention discloses an electromagnetic valve performance analysis method based on multi-physical-field optimization, and the method comprises the steps: building an electromagnetic differential equation and a valve element kinetic equation of a dynamic process of an electromagnetic valve through employing theoretical knowledge according to a plurality of physical fields related to the electromagnetic valve; according to the established mathematical physical model, calculating by utilizing finite element software to obtain part of physical field input parameters required in the equation; and then subjecting the mathematical model of the electromagnetic valve to joint simulation through mathematical calculation software, so that the performance law of the electromagnetic valve is furtherresearched, and meanwhile, electromagnetic valve design parameters in a joint simulation model are optimized by utilizing a genetic algorithm. According to the method, the response characteristic parameters of the electromagnetic valve can be accurately calculated, meanwhile, performance analysis and parameter optimization can be further conducted on the electromagnetic valve, a new method is provided for optimization design of the electromagnetic valve, the design efficiency and the design quality of the electromagnetic valve are improved, and the development cost is reduced. The invention relates to the technical field of electromagnetic valve optimization design.
Owner:SOUTH CHINA UNIV OF TECH
Method of calculating and analyzing temperature and stress strain finite elements of earth stud after being powered on
InactiveCN105183988AThe result is accurateSpecial data processing applicationsPower flowPhysical model
The invention belongs to the technical field of simulating calculation and relates to a method of calculating and analyzing temperature and stress strain finite elements of an earth stud after being powered on. The method includes the steps that firstly, power-on test measurement of the earth stud is conducted, and data of the stud obtained after different currents are introduced are collected; then, Auto CAD is utilized to build a geometric model, the geometric model is introduced into simulation calculation software COMSOL Multiphysics, a physical model is built in the software, and material parameters are set; boundary conditions are dynamically checked and modified according to the test data and the calculation result, and an optimum scheme of boundary condition setting of the earth stud obtained after being powered on is obtained; finally, finite element meshes are built, calculation is conducted, the calculation result is derived into the data analysis software, and the evolution situations of the temperature, the stress and the strain of the stud under the condition that different currents are introduced are obtained. By means of the method, the modeling calculation result of the temperature and stress strain of the earth stud obtained after the current is introduced is made to be more accurate, and support is provided for the test measurement of the earth stud.
Owner:UNIV OF ELECTRONIC SCI & TECH OF CHINA
Modeling method of bed body fluid-heat-solid coupling finite element thermal characteristic analysis model
InactiveCN110378005AHigh precisionOvercome the problem of low accuracy of heat transfer coefficientDesign optimisation/simulationSpecial data processing applicationsPhysical fieldThermal deformation
The invention discloses a modeling method of a bed body fluid-heat-solid coupling finite element thermal characteristic analysis model. The method comprises the following steps: firstly, establishinga real geometric model of the cooling liquid in a flow channel of a lathe bed, and performing fluid simulation analysis on the flowing process of the cooling liquid in the lathe bed by using Ansys CFXsoftware and based on a finite element method on the basis of fully considering a flowing heat exchange boundary condition; secondly, tranmistting a heat exchange coefficient result obtained throughfluid analysis to a thermal analysis module by adopting a fluid-heat-solid multi-physical field sequential coupling analysis method, and meanwhile, solving temperature distribution of a lathe bed by considering other boundary conditions; and finally, loading the temperature of the lathe bed into the structural statics model, and finally solving the thermal deformation of the lathe bed. The methodhas good universality and can be used for thermal characteristic analysis of similar lathe beds or other equipment.
Owner:XI AN JIAOTONG UNIV
High-precision motor multi-physics field coupling simulation calculation method
InactiveCN112800685AAccurate calculationDesign optimisation/simulationConstraint-based CADElectric machineryEngineering
The invention discloses a high-precision motor multi-physics field coupling simulation calculation method. The method comprises the steps of 1, establishing a deep learning model based on a Keras framework, and training existing ferromagnetic loss data; evaluating the model by adopting an out-of-order repeated K-fold verification method; expanding the training sample by establishing two deep learning models, and taking the expanded sample as the training sample of the other deep learning model; 2, taking electromagnetic loss as an input source for temperature field calculation; and 3, calculating and simulating a thermal stress borne by the motor due to temperature rise through multi-physics joint simulation of an electromagnetic-temperature-stress field. According to the multi-physics field coupling simulation calculation method, the electromagnetic loss can be accurately calculated, an accurate input source is provided for subsequent multi-physics field joint simulation, and the state of the motor in actual operation is accurately simulated.
Owner:HUNAN UNIV
Biological tissue characteristic parameter representation method based on single-needle actual measurement
InactiveCN107578820AImprove accuracyImprove scienceMedical simulationSpecial data processing applicationsMultiphysicsSensitivity analyses
The invention discloses a biological tissue characteristic parameter representation method based on single-needle actual measurement. The method comprises steps that step 1, through a radio frequencyheat ablation experiment, a power distribution function is acquired; step 2, a preset initial condition and a boundary condition are preset in COMSOL Multiphysics software, and a radio frequency temperature field simulation model is established; step 3, sensitivity analysis on biological tissue characteristic parameters is carried out; step 4, based on the parameter sensitivity analysis result, anaccurate representation function of sensitive parameters is acquired through utilizing single-needle actual measurement data; and step 5, the accurate representation function of the sensitive parameters is utilized to carry out temperature field simulation, comparison with actual measurement data is carried out to verify accuracy of a temperature field distribution model. The method is advantagedin that a problem that temperature field distribution can not be accurately acquired because of uncertainty of biological tissue characteristic parameters in the prior art is solved.
Owner:BEIJING UNIV OF TECH
Method for computer-supported development of an overall system consisting of subsystems
InactiveUS20180113964A1Avoid disadvantagesRapid, distributed, reliable and systematicGeometric CADDesign optimisation/simulationParallel computingClosed loop
A method is provided for computer-supported development of an overall system including subsystems. The subsystems include real products and virtual behavior models simulated in real-time, used in phases of the right branch of the V-model, including development steps “MIL,”“SIL” and “VPIL.” Each development step includes an environment model, a reusable multiphysics model and software. The development step “HIL” also includes another physics unit simulating parts of the hardware of a product that are only virtually present. The method provides a temporally parallel and spatially divided integration, and a corresponding test, of components on various levels (e.g., the right-hand branch of a V-model performed by the system developer). Open-loop and closed-loop control functions or processes for the overall system level may already be developed, even though all of the subsystems are not yet present. No parallel systems are required where new processes are run in advance.
Owner:ROLLS ROYCE DEUT LTD & CO KG
Electric field homogenization method of superconducting GIL insulator based on surface gradient conductance
The invention discloses an electric field homogenization method of a superconducting GIL insulator based on surface gradient conductance, and the method achieves the electric field optimization through the regulation and control of the surface conductance distribution of a circular truncated cone insulator. The method comprises the following steps: (1), establishing an axial coordinate system of the insulator; (2), enabling the surface electrical conductivity sigma(z) of the insulator and the axial coordinate z of the insulator to meet an expression: sigma(z)=k(z-z<0>)^2+sigma(0), wherein k isa parameter that needs to be optimized in the calculation, S / m2; z<0> is the coordinate of the bottom surface of the insulator, m; sigma(0) is the bottom surface conductivity of the insulator, S / m; (3), setting k to n different values, wherein n is not less than 2; (4), calculating the electric field distribution of the insulator in the axial direction at the DC voltage m kV using an AC / DC modulein the COMSOL Multiphysics software; (5), selecting the optimal parameter k according to the simulation result when the uniformity of the overall distribution of the electric field is the highest, i.e., constructing the optimal gradient distribution of surface conductivity. At this time, the effect of homogenizing the electric field is the best.
Owner:TIANJIN UNIV
Method for building three-dimensional terrain finite element model
InactiveCN108520097AEasy to handleStrong visualizationDesign optimisation/simulationSpecial data processing applicationsTerrainElement model
The invention discloses a method for building a three-dimensional terrain finite element model. The method comprises the steps of 1, determining the longitudinal and latitude range of a research target; 2, constructing DEM digital elevation data; 3, constructing target region Grid data; 4, encrypting the Grid data; 5, performing finite element modeling on a three-dimensional terrain. By improvinga traditional modeling method, by means of characteristics of COMSOL Multiphysics software, the method for building the three-dimensional terrain finite element model is rapid and high in precision and efficiency.
Owner:SOUTH CHINA UNIV OF TECH
Resource utilization method for mixed muck of silty-fine sand and silty clay of earth pressure shield
ActiveCN112966416AMeet pollution control requirementsRaise the ratioDesign optimisation/simulationResourcesInorganic saltsMuck
The invention discloses a resource utilization method for mixed muck of silty-fine sand and silty clay of an earth pressure shield, and belongs to the technical field of geotechnical engineering and tunnel engineering. The silty-fine sand muck is used as a slurry additive material to replace a synchronous grouting river sand material, so that the cost is reduced, and meanwhile, pollutants such as heavy metals and inorganic salts in the slurry are solidified. The method comprises the following steps: firstly, determining the content of silty-fine sand and pollutant components in the muck, performing a uniform experiment in a laboratory to prepare silty-fine sand slurry, testing the properties of the slurry and a stone body, and evaluating the pollution treatment condition; revealing a slurry diffusion rule by using COMSOL Multiphysics finite element software, establishing a deformation prediction model after slurry solidification by using a neural network, and predicting ground surface settlement under the grouting effect of the silty-fine sand muck slurry; and establishing a multi-target planning model based on grout and stone body performance, pollution degree and ground surface settlement regression analysis, and determining the optimal ratio of the synchronous grouting material. The method has high application value.
Owner:HOHAI UNIV
Microstructure design method for capacitive pressure sensor with microstructure dielectric layer
ActiveCN108388749AHigh precisionSimple designCAD circuit designSpecial data processing applicationsCapacitive pressure sensorMultiphysics
The invention discloses a microstructure design method for a capacitive pressure sensor with a microstructure dielectric layer, and belongs to the field of flexible pressure sensors. By combination ofAbaqus capable of solving a complicated nonlinear problem and large-sized COMSOL Multiphysics, the microstructure design method simulates a capacitive response of a microstructured capacitive pressure sensor under the action of external voltage; a simulation result is basically matched with an experimental result; compared with a previous simulation result, the simulation result has substantiallyimproved accuracy. The shape and the size of the microstructure are designed by changing parameters such as the elastic modulus, the bottom edge length, the angle, the height and the size of the microstructure of the dielectric layer, so that an influence rule of all the parameters on the linearity and the sensitivity of the sensor is obtained, and a basis is provided for optimization of the microstructure of the sensor. The microstructure design method disclosed by the invention is applicable to structural design and performance optimization of the microstructured capacitive sensors of shapes such as a prismatic shape, a cylindrical shape, a pyramid shape and a conical shape; the design method is high in accuracy, convenient and quick.
Owner:DALIAN UNIV OF TECH
PCR base manufacturing parameter optimization method based on finite element model numerical simulation
ActiveCN111898299AMeet temperature performance requirementsLow costGeometric CADDesign optimisation/simulationTemperature controlElement model
The invention relates to a PCR base manufacturing parameter optimization method based on finite element model numerical simulation. The method comprises the following steps: establishing a numerical simulation method by using common finite element software COMSOL Multiphysics and a with MATLAB interface of the common finite element software COMSOL Multiphysics; giving the actual temperature control process of the finite element model of the PCR base by using a transient analysis method, and performing manufacturing parameter optimization design according to the result so as to ensure that thePCR base can obtain the optimal dynamic and static performance in the actual thermal cycle process. Under the condition that the temperature performance index of the PCR base is met, the obtained optimized manufacturing parameters such as the optimal size of a heat preservation material can be used for guiding actual base machining, and it is guaranteed that the good heat uniformity is achieved on the premise that rapid temperature response is kept in the heat circulation process. According to the invention, the time and the material cost can be greatly saved for the research and developmentof a novel PCR base.
Owner:FUJIAN UNIV OF TECH
Multi-field coupling effect structure design method combining topological optimization and shape optimization
ActiveCN112966419AFully consider the performance impactEliminate the effects ofDesign optimisation/simulationConstraint-based CADCell designComputational physics
The invention relates to a structure optimization design technology, in particular to a multi-field coupling effect structure design method combining topological optimization and shape optimization, and the method comprises the following steps: creating a multi-field coupling effect topological optimization model by using a topological optimization method based on a variable density method, wherein a multi-physical field numerical model, a design domain, a boundary condition, a target function, a constraint condition and a design variable are included, calculating and obtaining sensitivity information of the target function to the design variable through a multi-field coupling finite element simulation method so as to update the design variable value of each unit in the design domain, and finally obtaining an optimal topological structure under the multi-field coupling effect. A topological structure is extracted, a shape optimization design model under the multi-field coupling effect is constructed according to the topological structure, then on the basis of multi-field coupling simulation, the structure contour is further optimized, the overall performance of the structure is improved, and finally the optimal structure meeting the multi-physics coupling effect is obtained. The requirements of the structure for various physical properties are met, the topological optimization structure is improved, and the structural performance is improved.
Owner:WUHAN UNIV
Deep learning and fuzzy control based optimized cooling method of singe-heat-source air conditioner
InactiveCN110376896AOvercome blindnessOvercoming adaptabilityAdaptive controlFuzzy control systemMultiphysics
The invention discloses a deep learning and fuzzy control based optimized cooling method of a single-heat-source air conditioner. The method comprises that (1) an input / output language variable and amembership function thereof are determined; (2) a fuzzy control rule is determined; (3) different defuzzing methods are used to output different air-conditioner cooling schemes, and COMSOL Multiphysics simulation is used for simulated cooling analysis on the equipment; and (4) the air-conditioner cooling schemes obtained from different defuzzing methods and corresponding simulation result data serve as input as a deep generation model, and a final air conditioner optimized cooling scheme is output by deduction. Via the method, the deep generation model is used to optimize the different defuzzying methods output by traditional fuzzy control, the better air conditioner cooling regulation scheme is provided, blindness and low adaptability of the traditional air-conditioner cooling control strategy are overcome to large extent, and the method has great significance in heating ventilation efficacy optimization and intelligent operation of rail transit.
Owner:ZHEJIANG UNIV
Engineering disaster early warning method and system based on collaborative fusion of multi-physics field monitoring data
ActiveCN114757309AImproving the precision of early warning of engineering disastersCharacter and pattern recognitionNeural architecturesMultivariate statisticalTerm memory
The invention relates to a multi-physics field monitoring data collaborative fusion engineering disaster early warning method and system, and belongs to the field of hydraulic engineering disaster prevention and control. The method comprises the steps that after multi-sensor real-time monitoring data of a potential dangerous part of an engineering structure is obtained and preprocessed, normalization processing is carried out on multi-physical field monitoring time sequence data, and a normalized sample matrix is constructed; analyzing the sensitivity of each physical field monitoring index to the engineering safety state by adopting a multivariate statistical method, and guiding the initialization training of the long short-term memory network according to the sensitivity to obtain an output result of the long short-term memory network; and taking an output result of the long-short-term memory network as evidence input, obtaining basic probability assignment of each early warning level after fusion according to an evidence theory fusion rule of Chebyshev distance improvement, and determining a disaster danger level of a potential danger part of the engineering structure by adopting a decision-making method of basic probability assignment. By adopting the method and the system, the early warning precision of engineering disasters can be improved.
Owner:QINGDAO TECHNOLOGICAL UNIVERSITY
Flexible PCB structure design method based on wet chemical etching joint simulation
ActiveCN112966467AReduce lossesLow costCAD circuit designSpecial data processing applications2D geometric modelData set
The invention discloses a flexible PCB structure design method based on wet chemical etching joint simulation. The method comprises the following steps: firstly, presetting a production parameter data set according to actual production data; then, according to the data set, using multi-physics field finite element simulation software to construct a flexible PCB equivalent two-dimensional geometric model, establishing a multi-physics field simulation model, and completing setting of material attributes, boundary conditions, initial conditions and grids to complete establishment of the simulation model; then calling and iteratively simulating the simulation model by using a model interaction algorithm and a GA according to a preset optimization target and a code parameter set, and curing and reserving optimized structure parameters obtained by simulation for production design. According to the invention, simulation calculation of the structure parameters is carried out through simulation, the structure parameters which are more targeted and meet the actual design requirement can be obtained more intelligently in combination with the GA algorithm, and the method is a scientific design method which can greatly reduce the design cost of a test mode and improve the design time efficiency.
Owner:WUHAN UNIV
Temperature field coupled surface acoustic wave resonator calculation method
PendingCN113962087ASolve the large amount of calculationTime-consuming to solveDesign optimisation/simulationSpecial data processing applicationsFinite element techniqueGraphics
The invention discloses a temperature field coupled surface acoustic wave resonator calculation method, which comprises the following steps of: 1) coupling temperature fields into a piezoelectric physics field to obtain a mathematical model for representing multi-physics field coupling of a surface acoustic wave resonator under the action of different temperature fields; 2) solving the mathematical model of multi-physics field coupling through a finite element FEM technology to obtain a finite element model of a temperature field quantity coupled multi-physics field surface acoustic wave resonator single-finger structure; 3) extracting a system matrix of a single-finger structure finite element model of the surface acoustic wave resonator, and obtaining a matrix equation of the surface acoustic wave resonator with a finite length structure at different temperatures through a finite element hierarchical cascading technology based on acceleration of a graphic accelerator. Therefore, rapid calculation of the frequency response characteristic curve of a surface acoustic wave resonator with a finite length structure at different temperatures is realized. According to the method, rapid and accurate calculation of a surface acoustic wave resonator with a finite length structure under different temperature conditions can be realized.
Owner:CHINA ELECTRONICS TECH GRP NO 26 RES INST
Multi-physics field coupling analogue simulation method and system for GIS disconnecting switch in different contact states
ActiveCN112800647AImprove accuracy and reliabilityDesign optimisation/simulationSpecial data processing applicationsMathematical modelGeometric modeling
The invention discloses a multi-physics field coupling simulation method and system for a GIS disconnecting switch in different contact states, and the method comprises the steps: setting three typical contact states of the GIS disconnecting switch, and carrying out the measurement on a GIS disconnecting switch test platform, and obtaining the loop resistance in different contact states; secondly, establishing geometric models of the GIS disconnecting switch in different contact states, and setting material attributes of corresponding areas; comparing the simulation loop resistance with the test loop resistance to adjust the contact condition of the moving and static contacts; setting a physical field control equation, a boundary condition, an initial condition and a coupling variable; and finally, carrying out mesh generation on the solution domain by utilizing a finite element method, and solving the multi-physics field coupling mathematical model. The simulation method is closer to the actual working condition of the disconnecting switch, so that the accuracy and reliability of the simulation result are high. The method and system are beneficial to research of multiple physical fields and characteristics of the GIS disconnecting switch in different contact states, and are of great significance to safe and reliable operation of the GIS.
Owner:国网山西省电力公司超高压变电分公司
Method for simulating unfreezing process and optimizing unfreezing process by adopting COMSOL software
ActiveCN110309530AOptimize the thawing processImprove thawing uniformityDesign optimisation/simulationSpecial data processing applicationsThree levelMathematical model
The invention discloses a method for simulating an unfreezing process and optimizing an unfreezing process by adopting COMSOL software. The method comprises the following steps: carrying out dynamic numerical simulation on a minced fillet thawing process by adopting COMSOL Multiphysics software, carrying out numerical solution on a coupling equation of electromagnetic wave dissipation and heat transfer by using a finite element method, and verifying a temperature value through an experiment; exploring the influence of the size of the minced fillet sample, the position of the minced fillet sample in the heating cavity, the radio wave power, the polar plate spacing and the heating intermittent time on the unfreezing uniformity of the minced fillet sample through a mathematical model established by COMSOL Multiphysics software; and finally designing a three-factor three-level orthogonal test by taking radio wave power, pole plate spacing and heating interval time as factors and taking time and temperature standard deviation required by thawing of a minced fillet sample as evaluation indexes of thawing effects according to the numerical value simulation result, determining the proper radio wave power, pole plate spacing and heating interval time, optimizing a thawing process, and improving the thawing uniformity.
Owner:FISHERY MACHINERY & INSTR RES INST CHINESE ACADEMY OF FISHERY SCI
Method for calculating movement of inclusions in VIM smelting process
ActiveCN112464543AGuaranteed accuracyGuaranteed correctnessDesign optimisation/simulationSpecial data processing applicationsAnalogue computationThermodynamics
The invention relates to a method for calculating movement of inclusions in the VIM smelting process. The method comprises the following steps: establishing a geometric model of the vacuum induction furnace; setting material physical property parameters of the vacuum induction furnace; adding and setting a magnetic field in the model; adding and setting a turbulence k epsilon flow field in the model; adding and setting a particle tracking physical field in the model; meshing the vacuum induction furnace model; configuring a solver and solving; and making result analysis. The method for simulating and calculating the motion trails of the inclusions in the VIM smelting process on the basis of COMSOL Multiphysics is provided for the first time, visual analogue simulation can be conducted on the motion trails and removal conditions of the inclusions in the closed and complex VIM smelting process, results difficult to observe in experiments are obtained, theoretical guidance and technical support are provided for optimization design of a VIM process scheme. The invention is of great significance to the realization of the high-purity target of the alloy material.
Owner:UNIV OF SCI & TECH BEIJING
Test method for testing gas permeability of concrete through concrete tube test specimen
The invention belongs to the field of building materials, and discloses a test method for testing the gas permeability of concrete through a concrete tube test specimen. The test method includes the steps that the concrete tube test specimen is manufactured through a concrete tube precast mold, and the test specimen is cured under the standard conditions; a concrete tube testing device is assembled; a concrete tube is first filled with a certain amount of gas, an inflatable opening and a joint of the device are subjected to leakage detecting through a soap bubble method, and it is ensured thatthe air tightness of the device is good; the concrete tube is filled with a certain amount of gas, and the change situation of the air pressure difference inside and outside the concrete tube with the time is monitored in real time through a pressure sensor; and modeling is conducted on a test system through COMSOL Multiphysics software, test data are input into a modeling model for comparison, and then the gas permeability of the concrete tube wall, that is, a concrete material is calculated. According to the test method for testing the gas permeability of the concrete through the concrete tube test specimen, the change situation of the air pressure difference inside and outside the concrete tube with the time can be monitored, and the gas permeability of the concrete material is calculated through numerical simulation.
Owner:63653 FORCES PLA
automobile windshield forming simulation method based on COMSOL Multiphysics
ActiveCN109800524AEasy to operateShorten experiment timeSpecial data processing applicationsFlat glassPhysical model
The invention relates to an automobile glass GT forming simulation method based on COMSOL Multiphysics. The automobile glass GT forming simulation method comprises the steps that S1, building a simplified heating furnace model and a plate glass original sheet model; S2, according to the obtained heating furnace model and the sheet glass original sheet model, simulating a glass heating and softening process by simulating a temperature field and a stress field through software; S3, constructing a physical model of the male mold, the thermal forming ring and the plate glass geometry, and simulating a thermal bending forming stage through software simulation stress field and temperature field; and S4, after hot bending forming is completed, constructing a cold forming ring, simulating the glass mold falling stage after hot bending forming, conducting simulation operation, and acquiring a simulation result. Three-dimensional modeling is carried out through software, and finite element analog simulation is carried out on the automobile glass GT forming heating stage, the hot bending forming stage and the mold falling stage.
Owner:FUZHOU UNIV
Complex micro-fluidic chip-oriented multiscale coupling simulation method
ActiveCN108446422AReflect deformationReflect motion trajectory trackingDesign optimisation/simulationSpecial data processing applicationsPhysical fieldMicroparticle
The invention discloses a complex micro-fluidic chip-oriented multiscale coupling simulation method. The method comprises the following steps of: firstly carrying out finite element method-based simulation on each single physical field action suffered by biological particles in a micro-fluidic chip; and carrying out lattice Boltzmann method-based biological particle model multi-phase flow simulation on a multi-physical field synthetic action suffered by the biological particles. Compared with the problem that the traditional simulation methods are difficult to process deformation and trackingproblem at two intersection interfaces, the method adopts a mesoscopic lattice Boltzmann simulation method, so that deformation and motion trajectory tracking of cells can be well reflected; and the mesoscopic lattice Boltzmann simulation method is used for solving flow fields in micro-fluidic chips without being limited by fluid continuity assumption, so that essential and subtle changes of fluidflowing can be reflected.
Owner:GUANGDONG UNIV OF TECH
CFD-based simulation analysis method for thermal sterilization process of liquid canned food
ActiveCN110020465AExact searchShort sterilization timeFood preservationDesign optimisation/simulationPhysical fieldMultiphysics
The invention discloses a CFD-based simulation analysis method for a thermal sterilization process of a liquid canned food, and the method comprises the steps: collecting data, carrying out the simplification processing, and building a can heat transfer model; based on the model, determining a control equation, an initial condition, a boundary condition and a subdivision grid, importing the control equation, the initial condition, the boundary condition and the subdivision grid into COMSOL Multiphysics software, and carrying out CFD solution; and performing corresponding post-processing basedon the result of the CFD solution, and analyzing the thermal sterilization process. According to the invention, the change conditions of physical quantities such as fluid flowing speed, temperature, pressure, humidity and the like at any position at any time in the liquid canned food in the thermal sterilization process to be studied can be given, and the physical field change and the thermal sterilization effect in the thermal sterilization process can be analyzed more accurately. The method is suitable for liquid canned food with different tank shapes and different contents, is helpful for accurately finding the position of a cold point before a hot penetration test is carried out, determines the shortest sterilization time, and finally realizes the optimization of the sterilization process.
Owner:ZHEJIANG UNIV
Kriging model-based optimization method of air-source heat-pump water-heater condenser tube
InactiveCN107704705AUniform temperature distributionIncrease temperatureDesign optimisation/simulationSpecial data processing applicationsCouplingPhysical model
The invention discloses a kriging model-based optimization method of an air-source heat-pump water-heater condenser tube. The method is characterized by including the following steps: (1) utilizing aparametric modeling function of AutoCAD software to construct a group of physical models of different condenser-tube diameters; (2) utilizing the parametric modeling function of the AutoCAD software to establish a group of physical models of different condenser-tube locations; (3) utilizing a fluid-field and thermal-field coupling method of COMSOL Multiphysics software to calculate temperature field distribution of the two groups of physical models; (4) determining that two obtained groups of data are sample points, and utilizing a Kriging model to carry out optimization calculation on the sample points; and (5) finally obtaining optimal condenser-tube structure parameters. The method has the advantages that the kriging model-based optimization method of the air-source heat-pump water-heater condenser tube is provided, temperature distribution inside a water tank is enabled to be most uniform through carrying out optimization design for a diameter and a location of the condenser tube,and temperature is enabled to be highest.
Owner:GUANGZHOU WEIJIN AIR CONDITIONER SCI & TECH
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