78 results about "Multiphysics" patented technology

The invention relates to a test system and a test method of multiphysics fatigue property, in particular to a fatigue property test system, a fatigue property evaluation and a life prediction method under the condition of coupling between power electricity and power thermoelectricity based on material damage and real-time monitoring damage, belonging to the field of material property evaluation. The fatigue property of piezoelectric ceramics small samples cannot be evaluated easily under the condition of coupling between power electricity and power thermoelectricity by current test device and test technique due to the restrictions of test device and test platform, thus restricting the application development of piezoelectric ceramics materials and devices. Aiming at the existing problems, the invention completes reasonable selection and optimal combination design of force field, thermal field, electric field and acoustic emission in the fatigue property test system and a mould which is applicable to an MSP method, and provides the fatigue property evaluation and life prediction method of small samples; on the basis, the fatigue property evaluation and life prediction of piezoelectric ceramics and other samples which are based on material damage and real-time monitoring damage can be realized in the coupling field of power electricity and power thermoelectricity.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.