21 results about "2D geometric model" patented technology

The invention provides an ICL postoperative arch height prediction and adjustment method and device, and the method comprises the steps: a data obtaining step: obtaining eye anatomical data of a patient, including the diameters of a short axis and a long axis of a ciliary sulcus; acquiring state data of the current implanted ICL, wherein the state data comprises a nominal size and a rotation angle in an eye; a geometric modeling and calculation step: establishing a two-dimensional geometric model of the ICL in the elliptical ciliary sulcus based on the nominal size of the ICL and the diameters of the long and short axes of the ciliary sulcus, calculating the diagonal length limited by four supporting leg points of the ICL on the model according to the rotation angle of the ICL in the eye, and further calculating the theoretical geometric arch height; and an adjustment scheme generation step: on the basis of the calculated theoretical geometric arch height, generating at least one secondary operation adjustment scheme for adjusting the actual postoperative arch height to be within a clinical ideal range, the adjustment scheme comprising rotating the current ICL to a new angle or replacing the current ICL with another ICL with a different size.

The invention provides a fan blade lightning attachment simulation prediction method and system based on magnetohydrodynamics, and the method comprises the steps: S1, constructing a mathematical model of a fan blade, and building a two-dimensional geometric model of the mathematical model; s2, arranging a spherical discharge electrode on the two-dimensional fan blade model; s3, electromagnetic and thermal material parameters are given to the two-dimensional fan blade model and the spherical discharge electrode; s4, applying a lightning current load on the spherical discharge electrode, and grounding a central wheel disc area of the two-dimensional fan blade model; s5, the surface boundary areas of the spherical discharge electrode and the fan blades are encrypted; s6, simulating the lightning attachment process of the fan blade; s7, representing a starting position and a spatial development trend of lightning leader and a dynamic evolution process formed by a discharge channel; and S8, determining the final attachment position of thunder and lightning. The lightning attachment position is accurately predicted, a lightning attachment mechanism and influence factors are disclosed, and key technical support is provided for lightning protection design and airworthiness conformity verification of aero-engine fan blades.

The application belongs to the field of power equipment, and discloses a transformer inter-turn short-circuit fault modeling method, system, device and medium, which comprises the following steps: a two-dimensional geometric model of a transformer core and winding is established, the two-dimensional geometric model is discretized and divided into a plurality of magnetic network units to obtain a discrete magnetic network model; a three-dimensional electrostatic field entity model of the winding is constructed, and a distribution capacitance matrix between turns of the winding and to the ground is calculated; a short-circuit grid point is set in the discrete magnetic network model, the short-circuit grid point is connected in parallel to a metallic short-circuit branch model to obtain a short-circuit closed branch; a transformer circuit is obtained, a coupling relationship between the transformer circuit and the discrete magnetic network model is constructed based on the distribution capacitance matrix, and a transformer inter-turn short-circuit fault model is constructed. The application can accurately describe the internal space electromagnetic distribution characteristics and the local nonlinear saturation characteristics of the core of the transformer.

The invention discloses a phase field method suitable for crystal growth under diffusion control in a molten salt system, and belongs to the field of numerical simulation of crystal growth in the molten salt system. According to the method, numerical simulation of the crystal growth process in the molten salt system is realized through the steps of geometric modeling, grid division, free energy function construction, order parameter and concentration evolution equation establishment, solution and the like. The method comprises the following steps: establishing a two-dimensional geometric model containing a crucible wall surface and a molten salt medium, and dividing grids; constructing a system free energy density functional; establishing a sequence parameter and concentration parameter evolution equation; and finally, calculating a phase field parameter and a physical property parameter of the single crystal material, and substituting the parameters into the equation for iterative solution to obtain a convergence solution of the sequence parameter and the concentration. Compared with the prior art, the method has the advantages that a solid-liquid interface does not need to be directly tracked, the model complexity and the calculation cost are reduced, the calculation requirement can be quickly responded, and the molten salt body ion concentration distribution can be calculated; the method can be applied to monitoring and prediction of the process of growing the single crystal material by the molten salt method.

The application provides a simulation method and system for a hot-rolling roller thermal-mechanical coupling process, and belongs to the technical field of multi-field simulation and analog, and comprises the following steps: a two-dimensional geometric model of the roller is established in a simulation software COMSOL, the two-dimensional geometric model is divided into multiple angle zones in the circumferential direction according to a working condition section; the two-dimensional geometric model is meshed; a variable node is added under a global definition module, an angle variable and a rotation variable are added in the variable node, the rotation of the roller in a hot continuous rolling process is simulated by setting the rotation variable, a physical field module is added, and a roller thermal-mechanical coupling finite element simulation model is obtained; the roller thermal-mechanical coupling finite element simulation model is solved, and the change curves of the temperature field distribution, the stress field distribution and the equivalent plastic strain are obtained. The application effectively simplifies the model construction process, improves the calculation efficiency and numerical stability of long-period simulation, and can be used in engineering scenes such as roller cooling system optimization, composite roller structure design and rapid evaluation of rolling process parameters.

The aluminum alloy heat pipe bearing and heat conduction integrated simulation analysis method and system combined with a VOF gas-liquid two-phase flow model are provided, the VOF gas-liquid two-phase flow model suitable for the aluminum alloy heat pipe is constructed, a plurality of representative flow guide unit styles are selected, and geometrical characteristic parameters of the representative flow guide unit styles are extracted; the method comprises the following steps: simplifying a three-dimensional heat pipe into two-dimensional geometric models on the premise of ensuring accurate characterization of a heat conduction path, then respectively coupling a plurality of two-dimensional geometric models with a VOF gas-liquid two-phase flow model, constructing a heat pipe finite element model comprising different flow guide units, performing multi-physics field simulation, and outputting simulation data; performing quantitative evaluation on different diversion styles based on simulation data, screening out an optimal style, setting a plurality of parameterized design variables for the optimal style, and constructing a plurality of finite element models; therefore, multiple rounds of finite element simulation analysis are carried out, the heat dissipation performance under different parameters is compared, the optimal parameters are finally determined, and optimal design of the overall strength bearing and heat conduction performance of the aluminum alloy heat pipe is achieved.

The invention discloses a method for evaluating the residual strength of a multi-scale fiber-reinforced flexible pipe under a stretch-bending load, and relates to the technical field of structural strength evaluation of ocean engineering composite materials, and the method comprises the following steps: extracting fiber distribution characteristics by adopting digital image processing based on a scanning electron microscope image; a Monte Carlo method is combined to construct a two-dimensional RVE geometric model of the fiber reinforced structure containing the damp-heat degradation, and macroscopic elastic parameters are predicted; a VUMAT user material subprogram containing dynamic damage is written based on Fortran, damage starting and evolution failure criteria of a fiber reinforced structure are embedded, and the nonlinear coupling evolution process of multiple damage modes such as fiber fracture, matrix cracking and interface debonding is simulated. According to the method, a material-damage-response multi-scale analysis framework is constructed by coupling microscopic material components, a microscopic damage model and macroscopic pipeline structure analysis, the problem that a traditional method lacks multi-scale damage coupling analysis under a complex load is solved, and the residual strength evaluation precision of the pipeline under the action of a stretching-bending combined load is improved.

A numerical simulation method for heat and mass transfer under the synergy of ultrasonic vibration and CMT-P arc is disclosed. The method includes constructing an arc additive manufacturing system and obtaining a sample; building a two-dimensional geometric model; forming a complete numerical model of heat and mass transfer in the ultrasonic-CMT-P arc molten pool; setting boundary and initial conditions; obtaining transient evolution results of the molten pool temperature field, velocity field, and phase distribution; and evaluating the accuracy and reliability of the constructed model. The advantages of this invention are: it enables the synergistic solution of the acoustic field, flow field, thermal field, and electromagnetic field, comprehensively describing the heat and mass transfer behavior under the ultrasonic-CMT-P composite process. By dynamically coupling the ultrasonic displacement boundary conditions, the CMT-P heat and force sources, and the motion law of the moving mesh to the solver, transient numerical solutions of multiple physics fields (acoustic, thermal, mechanical, and magnetic) can be achieved. By comparing the simulated droplet transition morphology with high-speed photographic images over time, and by performing quantitative error analysis on the calculated melt width and depth values ​​with experimental measurements, the accuracy of the model can be dually verified.

The embodiment of the application provides a kind of iced conductor aerodynamic parameter simulation method, device, equipment and medium, applied to the technical field of power system disaster prevention and mitigation.The method comprises: constructing two-dimensional geometric model based on the conductor diameter, ice thickness and ice type of target iced conductor;Determine the type and size of the flow field domain based on the conductor diameter and the simulation requirement of multiple wind attack angles, and construct the flow field domain model;The flow field domain model is structured grid division, the boundary layer of two-dimensional geometric model is established, and the complete grid is obtained;Based on the type of flow field domain, match simulation boundary condition, wind attack angle adjustment mode, and multiple reuse or grid reconstruction target simulation mode, and combine the preset simulation parameter, flow field domain model, two-dimensional geometric model and complete grid to carry out numerical simulation calculation on different wind attack angle working condition, to obtain the aerodynamic parameter under different wind attack angles.The technical effect of improving simulation efficiency is achieved.

The present application relates to the technical field of tire design, and particularly relates to a method for quickly generating a tire two-dimensional geometric model grid, an application and a computer program product. The method for quickly generating a tire two-dimensional geometric model grid comprises the following steps: first, drawing auxiliary lines; second, exporting a file; third, reading a mesh.dxf file generated in the second step; fourth, performing geometric repair on lines in TireLines in the second step; fifth, generating a part closed area; sixth, generating a unit closed area; and seventh, identifying accurate unit information. The present application adds grid auxiliary lines to a tire two-dimensional geometric model, and then directly and accurately extracts grid data by using a program, so that not only the speed is fast (5 minutes are expected), but also the present application is free from dependence on third-party software, and the efficiency of dividing a grid of a tire geometric model is greatly improved, thereby providing technical support for tire numerical simulation.

The application relates to an engine blade tenon finite element grid parameterization automatic generation method and system, which comprises the following steps: inputting control parameters for constructing a blade tenon finite element grid automatic generation; calculating the coordinates of vertices for constructing the blade tenon finite element grid according to the control parameters; generating a 2D geometric model according to the coordinates of the vertices; generating a tenon 3D grid along the z direction by adopting a translation replication method based on the 2D geometric model; and outputting tenon 3D grid data. The application can realize parameterization grid automatic generation of 8-node 4-edge 2D grids or 20-node 6-face 3D grids, so that the application has high efficiency, saves a large amount of manpower, shortens the calculation time, and provides a grid generation basis for blade tenon optimization design.

This invention relates to a method for simulating the distribution of magnetofluid injection based on the coupling of particle tracking and fluid dynamics, belonging to the field of magnetic nanoparticle movement and particle tracking. The method includes: constructing a two-dimensional geometric model containing healthy tissue, abnormal tissue, and an injection syringe, and setting parameters; constructing a fluid model based on Darcy's law, and calculating the fluid velocity and pressure distribution in the interstitial tissue; coupling the fluid velocity, and solving the diffusion-convection-reaction equation using the finite element method to obtain the macroscopic concentration distribution of the magnetofluid after injection; establishing a particle tracking module, setting discrete particles with the same properties as the magnetic nanoparticles; coupling the interstitial fluid velocity, calculating the drag force and gravity acting on the particles according to Newton's second law, and simulating the particle motion to reveal the microscopic trajectory of the magnetic nanoparticles. This method, by coupling the macroscopic concentration field with the microscopic particle motion, can more realistically simulate the distribution behavior of magnetofluid within complex porous biological tissues.

This invention provides a method and system for simulating and predicting lightning attachment on fan blades based on magnetohydrodynamics. The system includes the following steps: S1: constructing a mathematical model of the fan blade and establishing its two-dimensional geometric model; S2: placing a spherical discharge electrode on the two-dimensional fan blade model; S3: assigning electromagnetic and thermal material parameters to the two-dimensional fan blade model and the spherical discharge electrode; S4: applying a lightning current load to the spherical discharge electrode, grounding the central disk area of ​​the two-dimensional fan blade model; S5: encrypting the surface boundary area between the spherical discharge electrode and the fan blade; S6: simulating the lightning attachment process on the fan blade; S7: characterizing the starting position and spatial development trend of the lightning leader and the dynamic evolution of the discharge channel formation; and S8: determining the final lightning attachment location. This invention accurately predicts lightning attachment locations and reveals the lightning attachment mechanism and influencing factors, providing key technical support for lightning protection design and airworthiness compliance verification of aircraft engine fan blades.

The application discloses a method and device for establishing an oxidation corrosion model of a ferrochrome alloy in a closed environment based on finite elements, and the method comprises the following steps: acquiring a first size of a closed gas environment, and acquiring a second size of a sample of a ferrochrome alloy material; establishing a two-dimensional geometric model according to the first size and the second size; pre-setting oxidation corrosion reaction information of the ferrochrome alloy material; pre-setting a first attribute of the ferrochrome alloy material, a second attribute of a reaction substance and a third attribute of the closed gas environment; performing grid division on the ferrochrome alloy material to obtain a target grid division area; and constructing an oxidation corrosion model according to the two-dimensional geometric model, the oxidation corrosion reaction information, the first attribute, the second attribute, the third attribute and the target grid division area. The application can improve the data accuracy of monitoring and predicting the corrosion degree of the alloy, and can be widely applied to the field of computer technology.

The application provides a three-dimensional parameterized modeling method based on a two-dimensional midship section of a midship cargo hold, and the method comprises the following steps: S1, obtaining midship cargo hold parameters according to a midship section drawing of the midship cargo hold; S2, arranging the obtained midship cargo hold parameters into an external data file which can be read by three-dimensional modeling software; S3, reading the external data file and performing secondary development to obtain contour node coordinate information of a longitudinal plate of the midship cargo hold and installation node coordinate information of a longitudinal frame of the midship cargo hold; S4, performing parameterized geometric modeling on the longitudinal plate of the midship cargo hold and the longitudinal frame of the midship cargo hold to obtain two-dimensional geometric models of the longitudinal plate of the midship cargo hold and the longitudinal frame of the midship cargo hold; and S5, uniformly performing longitudinal stretching on the two-dimensional geometric models of the longitudinal plate of the midship cargo hold and the longitudinal frame of the midship cargo hold to obtain a three-dimensional model of the midship cargo hold. The method uses three-dimensional modeling platform secondary development technology to quickly generate the three-dimensional model of the midship cargo hold, provides a basis for quick conversion of a finite element model of the midship cargo hold, and greatly shortens the construction time and construction difficulty of the finite element model of the midship cargo hold.

The invention discloses a directional solidification heating device optimization design method based on multi-physics field coupling and related equipment, and the method comprises the steps: determining a casting mold assembling mode, the number and a to-be-optimized parameter set, including structural parameters defining the shape of a heating device; performing parametric modeling on a system comprising the heating device and the casting according to the parameter set to generate a two-dimensional geometric model capable of being automatically updated; establishing a multi-physical field simulation model for coupling solid and surface radiation heat transfer based on the model, and carrying out numerical solution to obtain casting temperature field distribution; setting an optimization target by taking the casting boundary average temperature difference as a temperature uniformity index, setting a to-be-optimized parameter set as an optimization variable, and setting geometric and / or process constraints; and on the premise of satisfying the constraint, driving the optimization solver to iterate by using a gradient-free optimization algorithm until the temperature uniformity index reaches an extreme value, and obtaining an optimization parameter set. The invention aims to overcome the problems of non-uniform heating and the like of the existing HRS equipment, and the optimal heating scheme is quickly given for different casting modules.

The application relates to a method and device for three-dimensional analysis of two-dimensional numerical simulation results of a denitration SCR system. The specific scheme is as follows: a first two-dimensional numerical simulation result is obtained by simulating the operation process of a denitration SCR reactor based on a first two-dimensional geometric model; a second two-dimensional numerical simulation result is obtained by simulating the operation process of the denitration SCR reactor based on a second two-dimensional geometric model; target monitoring points on a target monitoring surface are determined based on the target monitoring surface; first weight values of first physical quantities of the target monitoring points in the first two-dimensional geometric model are determined based on first simulation physical quantity data; second weight values of second physical quantities of the target monitoring points in the second two-dimensional geometric model are determined based on second simulation physical quantity data; and three-dimensional physical parameters of the target monitoring points are determined based on the first weight values, the second weight values, the first simulation physical quantity data and the second simulation physical quantity data. The application improves the accuracy of simulation analysis of the denitration SCR reactor.

The invention discloses an atmospheric plasma thermal barrier coating finite element modeling method and system, and the method comprises the steps: S1, simplifying pores in a ceramic layer into circular holes based on the defect structure characteristics of an atmospheric plasma spraying coating, removing microcracks, and determining the porosity range; s2, acquiring engineering stress-strain data of the substrate layer material at the service temperature, and converting the engineering stress-strain data into real stress-strain data; s3, based on the pore simplification rule and the material data, generating a 2D geometric model containing random circular pores through a programmed script; s4, importing the pore parameters into a Python script, and dynamically constructing a finite element model; and S5, applying a Brittle Cracking criterion to the finite element model to simulate erosion failure. According to the method, complex structure defects in the ceramic layer are separated into single variables such as porosity, pore size and pore distribution, independent research and quantitative prediction are carried out, and blade erosion mechanism analysis and preparation process improvement are guided.

This application provides a method and system for constructing a leakage inductance calculation model for a high-frequency transformer with Litz wire windings. The method obtains the core window parameters and Litz wire winding parameters of the high-frequency transformer, and maps the three-dimensional core window region onto a two-dimensional plane according to the actual cross-sectional structure to establish a two-dimensional geometric model for high-frequency electromagnetic field analysis. The electromagnetic excitation conditions of the high-frequency transformer are set, along with the sinusoidal excitation frequency and corresponding boundary conditions. A current density distribution constraint varying with frequency is introduced into the winding cross-section to construct a finite element model of the core window. The finite element model is used to calculate the magnetic field strength distribution and magnetic field energy distribution within the core window region, and a high-frequency effect correction coefficient is introduced to construct a leakage inductance calculation model considering high-frequency effects, thereby predicting the leakage inductance within the core window region. This application achieves accurate prediction of leakage inductance in high-frequency transformer design, optimizes winding structure, and improves overall energy utilization.

The invention discloses an electromagnetic equipment winding arrangement and slot fullness rate optimization method, which is realized based on an equal circle placement algorithm. The method comprises the following steps: establishing a two-dimensional geometric model of an electromagnetic equipment winding, constructing a mathematical model and a physical model corresponding to the two-dimensional geometric model, converting an arrangement problem of the winding in an equipment slot into an equal-circle placement problem for solving, and solving a circular or semicircular part by using an anthropomorphic and anthropomorphic algorithm; and for the trapezoid part, optimizing by using a heuristic algorithm based on circle included angle adjustment. And an optimized winding arrangement diagram is obtained through the algorithm. According to the method, the winding arrangement is adjusted, an optimized winding arrangement scheme is obtained, and the slot fullness rate is calculated, so that the optimization of the winding arrangement and the slot fullness rate of the electromagnetic equipment is realized. The technical scheme is suitable for pear-shaped grooves, rectangular grooves and trapezoidal grooves, the arrangement structure is homogenized, the skin effect, local flux density unevenness and eddy current loss are effectively reduced, and the motor stability is improved.

The application discloses a multi-core superconducting strand electromagnetic behavior simulation method and system and a computer storage medium. The method comprises the following steps: establishing a two-dimensional geometric model of a multi-core superconducting strand; determining a self / mutual inductance coefficient matrix of the multi-core superconducting strand and a self / mutual inductance coefficient matrix of each core wire by using the two-dimensional geometric model; determining a transport current caused by an applied current of the multi-core superconducting strand and an induced current caused by an applied magnetic field; determining a coupling current of each core wire and a magnetic field change rate caused by the coupling current according to the induced current; determining a total current of each core wire; determining a current distribution of the multi-core superconducting strand by coupling the transport current and the total current; and obtaining result data of electromagnetic behavior simulation after a loop ends. The application adopts a 2D modeling strategy based on an A-V method, has the advantages of small calculation amount, large calculation range and fast calculation speed, and can be used as an efficient auxiliary design tool to realize rapid simulation analysis on the electromagnetic behavior of partial coupling in a superconductor 3D problem.