66 results about "Finite element mesh generation" patented technology

The invention discloses a chip temperature predicating method based on ANSYS finite element heat analysis. The chip temperature predicating method comprise steps as follows: a chip interior structure solid model is established by ANSYS according to acquired chip model parameters; the chip interior structure solid model is subjected to finite element mesh generation; the heat generation rate and the boundary conditions are loaded, then, the chip interior structure solid model after finite element mesh generation is subjected to steady-state heat analysis, and the maximum temperature of a chip is obtained; the heat generation rate of the chip is changed, and the maximum temperature of the chip under different heat generation rates is acquired through steady-state heat analysis; the relation curve of the heat generation rate and the chip temperature is fitted, and a relation function of the heat generation rate and the chip temperature is obtained; and the actual heat generation rate is substituted into the relation function of the heat generation rate and the chip temperature, and the actual temperature of the chip is obtained. According to the method, the temperature predication is placed at the physical design stage of the chip, the cost is reduced and the operation is simple and convenient; and the method can be widely applied to the technical field of semiconductors.

The invention discloses an analysis method of motor crank dynamics, which includes that: in Hypermesh software, a crank system is divided by finite element mesh generation into a crank, a flywheel, a belt pulley, a timing gear and a main bearing seat etc.; use Nastran software to execute the reduction solving of a finite element substructure; in EXCITE software, construct a model of the crank system dynamics, and exert the corresponding boundary condition on elements to implement simulation calculation; use the Nastran software to implement restoration solving of dynamic stress on the crank, perform post-processing and execute fatigue analysis on dangerous points; reasonably evaluate the crank system according to the results, and if the structure is not reasonable, the structure optimization is still needed. The method uses EXCITE calculation technique to execute dynamics analysis on the motor crank, obtains the strength and the fatigue parameters of the motor crank, and further evaluates the structure parameters of the crank and the related parts of the motor reasonably, therefore, making the improvement thereof.

A computing method for hub ultimate strength of a wind turbine generator system belongs to the technical field of wind power generation, and comprises the following steps: modeling by adopting software of finite element analysis, performing finite element mesh generation, setting constraint conditions and computing to obtain a deformation and stress cloud chart. The modeling process is as follows: 1, drawing a 3D model for a hub, importing the 3D model into a finite element software platform, and drawing a 3D entity model for the connection part of blades and the hub and the connection part of a main shaft and the hub in the finite element software; 2, setting material attributes for the blades, the main shaft and the hub, establishing a finite element model thereof, rigidly coupling the blades, the main shaft and the hub, and determining an overall coordinate system of the hub; 3, establishing nodes at root parts of the hub and each blade, converting the nodes into a blade root coordinate system specified by Germanischer Lloyd, then rigidly coupling the nodes to the blades, so that the load can be transmitted to the hub through the blades. The computing method facilitates accurate computation of strength performance of the hub, saves the computing time and improves the computing efficiency.

The invention relates to a pipeline valve safety assessment method based on limit external load calculation. The method comprises steps as follows: S1, establishing a three-dimensional geometrical model of a valve, a pipeline and a connecting piece; S2, performing finite element mesh generation on the three-dimensional geometrical model to establish a finite element mesh model; S3, establishing a limit external load finite element calculation model on the finite element mesh model; S4, performing calculation according to the limit external load finite element calculation model to obtain a limit external load; S5, establishing multiple combined external load finite element calculation models under the combined action of the limit external load and the maximum working pressure on the finite element mesh model; S6, calculating the stress distribution of the pipeline valve through the combined external load finite element calculation models and determining the safety performance of the pipeline valve according to the stress distribution. With the adoption of the method, the effect caused by the external load on the pipeline valve can be considered before prototype production, whether the strength property of the valve meets the design requirement or not can be judged, potential risks can be predicted, and the product development cycle is shortened.

The invention discloses a generating method of a finite element mesh in a thin-wall curved surface structure, aiming to solve the technical problem of great equivalent stress of a traditional design method of a finite element model in a perforated thin-wall conical curved surface structure. The technical scheme comprises the following steps of: firstly, generating a plane finite element mesh on a parameter plane by adopting a solid modeling method; then, generating network nodes in a space thin-wall curved surface structure through a parametric mapping relation by adopting a direct generating method; and generating a finite element mesh in the space thin-wall curved surface structure by utilizing corresponding unit topology information on the parameter plane. Compared with the prior art, the maximum equivalent stress of the finite element model in the perforated thin-wall conical curved surface structure in the same size is greatly reduced.

The invention discloses a modeling method for MJ bolt and nut finite element meshes. The method comprises the following specific steps: I, summarizing geometrical features of a bolt and a nut; II, performing mathematical description on a thread zero-position section of the bolt; III, performing mathematical description on a thread zero-position section of the nut; IV, generating unthreaded region finite element meshes of the bolt and the nut; and V, generating thread node offsets of the bolt and the nut, and performing node movement on meshes on threads in order to obtain a threaded bolt. Through adoption of the modeling method, the MJ bolt and nut finite element meshes with threaded structure features can be generated rapidly and effectively. The meshes are hexahedron co-node meshes, so that errors caused by adoption of a TIE command or a tetrahedron mesh can be effectively avoided, and the calculation accuracy is increased greatly.

The invention discloses a method and apparatus for analyzing a welded structure. The method comprises the steps of: obtaining a three-dimensional model of the welded structure; acquiring a welding joint standard model corresponding to each weld on a three-dimensional model of the welding structure, wherein the welding joint standard model is preset; performing finite element mesh generation on thethree-dimensional model of the welded structure; loading welding result data of each of the welding joint models from a welding structure calculation database, and performing strength and fatigue analysis on the three-dimensional model of the welding structure according to the welding result data of each of the welding joint models, wherein the welding structure calculation database is established in advance; if it is judged that the result of the strength and fatigue analysis meets the design requirement, outputting the message that the welded structure is qualified. The apparatus is used toperform the method described above. The analysis method and the device of the welding structure provided by the invention improve the reliability of the welding structure.

The invention belongs to the field of structural optimization design, and particularly discloses a topological optimization method for a multi-material structure. The method comprises the steps of performing finite element mesh generation on a design domain of a to-be-processed object to obtain a preset number of mesh units, and establishing level set functions in one-to-one correspondence with entity materials; calculating an elastic matrix, a rigidity matrix and a displacement vector; calculating a velocity field and a sensitivity degree, and converting or deleting the entity material in thegrid cell according to the sensitivity degree to obtain a level set function after the first optimization under the current iteration; updating to obtain a level set function optimized for the secondtime under the current iteration by utilizing the speed field; and judging whether the result of the second optimization is converged or not according to the flexibility and the volume error. According to the method, the defects that a classical level set topological optimization method depends on initial design and a two-way progressive optimization method cannot obtain a smooth boundary are overcome, the structural rigidity is improved to a certain extent, and the provided method is stable and effective.

The invention provides a node information optimization processing method and a device based on a CAE model, comprising the following steps: acquiring a body-in-white, wherein the body-in-white comprises node information and grid information at a hole; The CAE model of body-in-white (BIW) computer aided engineering (CAE) is constructed by the finite element mesh generation of BIW with Hypermesh software. The node information is stored in the csv table, and the optimization processing device is called in the CAE model of the body-in-white, the node information in the csv table is in the coordinate position, and the node is constructed in the form of the temporary node; the node information is stored in the csv table, and the optimization processing device is called in the body-in-white CAE model. Based on the mesh information at the temporary nodes and holes, Load points for the same model, Unify the positions of output points and connection points to avoid the difference of analysis results caused by the difference of positions and the situation that no leakage point will appear. The loading points, output points and connection points of the same model can be unified to avoid the difference of analysis results caused by the difference of positions and the situation that no leakage point will appear.

The invention discloses a method for obtaining the quenching process heat transfer coefficient of an aluminum alloy component under the three-dimensional heat transfer condition based on a finite element method, and relates to the technology of obtaining the heat transfer coefficient under the three-dimensional heat transfer condition. The method aims to solve the problem that the heat transfer coefficient obtained under the one-dimensional heat transfer condition does not agree with the heat transfer coefficient of the actual aluminum alloy component under the three-dimensional heat transfer condition, and thus the obtained heat transfer coefficient is inaccurate. The method includes the steps that a three-dimensional heat conduction differential equation under a rectangular coordinate system is established; on the basis of the finite element computing method, the aluminum alloy component is subjected to finite element mesh generation, and the temperature field corresponding to a certain moment of time is calculated; whether the test temperature and the calculating temperature of a test point meet a convergence condition or not is judged; if yes, the method is ended; if not, a novel heat transfer coefficient is obtained through optimization by means of a genetic algorithm; a novel temperature field is calculated according to the novel heat exchange coefficient, and whether the test temperatures and the calculating temperatures of N test points meet the convergence condition or not is continuously judged. The method can be used for obtaining the heat transfer coefficient under the three-dimensional heat transfer condition.

The invention discloses a method and a system for simulating deformation of a natural fracture slippage shear shale gas horizontal well casing under multistage fracturing. The method comprises the following steps: establishing a natural fracture slippage shear casing model; performing finite element mesh generation on the natural fracture slippage shear casing model, and substituting a fracture angle, a stratum elastic modulus, a casing elastic modulus or a casing wall thickness to obtain a casing Mises stress curve graph; and substituting the crack angle and the slip distance to obtain an inner diameter curve graph of the casing deformation failure about the crack angle and the slip distance. Aiming at the problem of failure of the shale gas horizontal well casing due to different fracture angles and different formation properties, by means of finite element software, shear deformation of the shale gas horizontal well casing is studied through finite element analysis, and the slip limit of a shear casing variable-jamming bridge plug caused by fracture slip at different angles is analyzed; and a data support is provided for avoiding natural cracks as much as possible during well drilling, ensuring normal hydraulic fracturing work and reducing the failure probability of the horizontal well.

The invention discloses an internal fixed parameter optimization treatment individualized modeling method based on a fracture healing process. The method comprises the following steps that a fracturesite is scanned, modeling is performed on a fractured bone; an orthogonal experimental design method is adopted to combine and assemble different internal fixed parameters in a three-dimensional software, the finite element mesh generation is performed on a fractured bone model, a mechanical property value is assigned according to a gray value on the fractured bone of an internal fixation system;the assembly of different screws is carried out, and whole finite element mesh generation is carried out; a mechanical environment simulating the fractured bone is loaded and calculated, a stress on the internal fixation system and a healing result of the fracture are obtained, and then the fracture healing result is evaluated; the screw layout is updated, and the above steps are repeated to perform combined optimization on the screw layout The internal fixed parameter optimization treatment individualized modeling method based on the fracture healing process has the advantages that the errorcaused by manually dividing the cancellous bone and the bone cortex is avoided, and a basis is provided for the combined optimization selection of the internal fixed parameters of a bone fracture plate during the fracture treatment.

The invention relates to a method for constructing a three-dimension finite element model which treats a tibial plateau posterior-lateral fracture with different inner fixing manners. The method specially includes the following steps that CT tomography is used for obtaining cross-sectional image data of a normal tibia attached outer steel plate and a normal tibia attached rear steel plate; application open source software ITK-SNAP is used for carrying out medical image processing and cutting; a solid geometric model is generated in professional three-dimension finite-element mesh generating software HyperMesh; solid geometric models in different assemblies are selected according to needs in the HyperMEsh and assembled, a needed model containing the whole tibia, a tibial fracture model and a model for treating the tibial fracture with different inner fixing manners are generated, each model is composed of multiple assemblies, each assembly is divided into grids respectively and multiple tetrahedron finite element models which treat the tibial fracture with different inner fixing manners and of the tibia are finally generated. According to the method for constructing the three-dimension finite element model which treats the tibial plateau posterior-lateral fracture with different inner fixing manners, the ITK-SNAP and the HyperMesh software are used for rapidly and accurately setting up the three-dimension finite element model which treats the tibial plateau posterior-lateral fracture with different inner fixing manners, the modeling speed and the modeling quality are greatly improved and a base is laid for further biomechanical analysis.

The invention discloses a PMFCL (permanent-magnet-biased fault current limiter) magnetic current thermal coupling modeling method. The PMFCL magnetic current thermal coupling modeling method includes establishing a 2D model of a half-wave current-limiting topological structure of the PMFCL; employing finite element software Ansoft to simulate the model; establishing a 3D model of the half-wave current-limiting topological structure of the PMFCL by the aid of the Ansoft; establishing a transient thermal analysis model in the ANSYS, subjecting the transient thermal analysis model to finite element mesh generation and subjecting a temperature field to graph mapping to the 3D model of the half-wave current-limiting topological structure of the PMFCL, and accordingly obtaining a temperature field calculation result of a PMFCL device at any moments. According to the arrangement, electromagnetic fields and current vectors of a winding and components of a linear PMFCL are analyzed and calculated with thermal fields to obtain magnetic-current-thermal coupling analysis, accordingly imparting a significant reference for material types and parameter designs of the PMFCL.

The invention discloses a side slope three-dimensional finite element mesh generation method under a complex geological condition. The method comprises the following steps that: 1) on the basis of a CAD (Computer-Aided Design) platform, extracting topographic contour and geological interface elevation point data; 2) establishing the mesh node data of target range plane projection; 3) on the basisof an inverse distance interpolation method, constructing three-dimensional mesh node data in the target range; 4) creating the mesh node and the unit of a specified node sequence to obtain a three-dimensional finite element mesh; and 5) checking the quality of the generated finite element mesh, and if the quality is not qualified, returning the step 3) to regenerate the finite element mesh. The method provides a feasible finite element mesh division thought, the three-dimensional finite element calculation mesh under the complex geological condition can be established at high efficiency and high accuracy, the quality and the amount of the finite element mesh can be effectively controlled, repeatability is high, simplified processing is not required, and a finite element calculation effectis good.

The invention discloses a CFD-FEM-SPH four-way coupled liquid-carrying ship water elastic response simulation method, which comprises the following steps: S1, establishing a three-dimensional finite element model of a ship body structure in an FEM solver, performing finite element mesh generation on the ship body structure, defining parameters of various structural units, and applying constraints and loads; s2, establishing a numerical pool model in the CFD solver, establishing a pool fluid domain and a hull shell model, and setting various conditions; s3, establishing a liquid tank sloshing model in the SPH solver, and performing attribute setting on the liquid tank; s4, setting a CFD-FEM-SPH four-way fluid-structure interaction data transmission method; and S5, performing program operation solution and data export. According to the method, the combined action of ship motion, wave load, liquid tank sloshing and structural response is comprehensively considered, various fluid-solid coupling problems are fully considered, and the motion and stress conditions of the liquid-carrying ship sailing in waves can be more accurately simulated.

The invention belongs to the technical field of strength analysis and simulation, and particularly relates to a shaft part strength finite element analysis method. The analysis method comprises the following steps: establishing a shaft part mathematical model by utilizing three-dimensional modeling software, and storing or exporting the model in a file format which can be identified by the analysis software; simplifying the model, and cancelling unnecessary geometrical characteristics; entering finite element analysis software, and setting a resolving type; importing the part mathematical model into finite element analysis software; selecting a tetrahedron or hexahedron unit to perform finite element mesh generation on the mathematical model; adding materials to the mathematical model or unit and inputting material parameters; applying boundary conditions to the mathematical model, the finite element or the node; setting a resolving output item; and resolving and displaying a resolvingresult. The phenomenon that the analysis result does not accord with the actual situation due to incorrect constraint modes, torque and bending moment applying modes and positions of the bearing, thekey groove, the spline and the gear is effectively avoided. The analysis result obtained by adopting the analysis method provided by the invention is more accurate.

The invention relates to a parametric modeling method of a laminated composite plate imitating mother-of-pearl, which comprises the following steps: setting geometrical structure parameters of the mother-of-pearl layered composite plate; according to the geometrical structure parameters, establishing a three-dimensional geometrical model of laminated composite plate imitating mother-of-pearl; obtaining a finite element mesh model of the laminated composite plate imitating mother-of-pearl through the mesh parameters by conducting finite element mesh generation on the plate. The script file is compiled by Python language, an internal function of ABAQUS is called to complete modeling operation, the script file runs in ABAQUS software, and thus automatic and parameterized modeling of laminatedcomposite plate imitating mother-of-pearl are realized. The invention only needs to modify the geometrical structure parameters and mesh partition parameters of the pearl mother-of-pearl layered composite plate in the script file according to the actual requirements, and through running of the script file again, the geometric model and finite element mesh model of laminated composite plates withdifferent geometrical parameters and element densities can be generated automatically. The modeling process is highly automated and efficient, which can greatly reduce the modeling work in the simulation analysis and optimization design of mechanical properties of laminated composite plates imitating mother-of-pearl.

The invention relates to a data exchange method and system based on STEP and GEO formats. The method comprises the steps that on the basis of an STEP file generated by CAD software, geometrical information of the STEP file is extracted through python, the topological relation between geometrical information of all layers is associated, and finally the geometrical information is converted into a GEO format which can be read by a Gmsh (finite element mesh generation program). In order to solve the problem of non-uniform definition of a data structure between two geometric standards, geometric information in STP is stored in a python dictionary, and after structure conversion and adjustment are performed in a unified manner, the geometric information is output as a geometric format conformingto the GEO standard. According to the method, data format butt joint of CAD software and finite element mesh generation software is achieved, and mesh generation and subsequent solving of a complex model are facilitated.

The invention discloses a wind power tower cylinder oil seal platform welding residual stress prediction method and a welding process optimization method. The method comprises the steps of obtaining structural parameters, welding material parameters, welding modes and heat source parameters of a wind power tower cylinder; establishing a three-dimensional model of the wind power tower drum containing the weld joint according to the structural parameters of the wind power tower drum; determining a heat source model according to the welding mode; carrying out finite element mesh generation on thethree-dimensional model of the wind power tower drum; performing welding simulation based on the wind power tower three-dimensional model, the heat source model, the heat source parameters and the welding material parameters obtained after finite element mesh division, performing finite element analysis on a temperature field and a stress field in the welding process, obtaining a residual stressprediction result of the wind power tower after welding, providing a reference basis for optimization of welding process parameters, and therefore, the welding process can be adjusted and optimized, an excellent welding seam is obtained, and the service life of the wind power tower is prolonged.

The invention discloses an equivalent stiffness-based dynamic SSS clutch modeling method. The method comprises the following steps of: carrying out three-dimensional modeling and finite element mesh generation on an SSS clutch so as to obtain a finite element model of the SSS clutch, applying a boundary condition on the finite element model of the SSS clutch to calculate lateral displacement of each position point on an axis position of the SSS clutch, and drawing a deflection curve; and keeping the main three-dimensional model of the SSS clutch unchanged, removing engaging teeth of an intermediate shaft and an output shaft, selecting corresponding nodes on the outer side surface of the intermediate shaft and the inner side surface of the output shaft to establish a matrix unit, setting a same boundary condition to carry out finite element calculation, optimizing stiffness elements in the matrix unit by adoption of an optimization algorithm until a deflection curve fitting degree achieves a convergence standard, and outputting each element of the matrix unit. According to the method, a dynamic model of the SSS clutch is established: gear teeth are removed on the basis of keeping the main body of the SSS clutch unchanged, so as to connect the intermediate shaft and the output shaft via the optimized matrix unit and then replace gear teeth engaging contact.

The invention discloses a dynamics optimization simulation analysis method for a driving mechanism of a rail-mounted inspection robot. The method comprises the following steps: acquiring material attributes and sizes of components of the driving mechanism of the rail-mounted inspection robot; establishing a three-dimensional model by utilizing a finite element method parameterization technology and carrying out parameterization processing on the main structure size; applying material attributes and establishing a standby material library; applying boundary conditions and conducting parameterization processing on the link relation of the key positions; performing finite element mesh generation on the three-dimensional model to obtain a finite element model; conducting kinetic analysis on the rail-mounted inspection robot driving mechanism, and obtaining an analysis result; and judging whether the maximum equivalent stress and the maximum deformation of the structure meet preset conditions or not. The problem of repeated work and time caused by repeated design and sample piece machining during structure optimization in the development process of a traditional inspection robot is solved, and repeated test verification is avoided for different optimization schemes, so that the research and development and optimization time is shortened, the development expenditure is saved, and theanalysis precision is improved.

The invention discloses a locomotive main transformer oil tank strength simulation analysis method and design method. The method comprises: establishing a solid model of a transformer body and an oiltank; performing mesh generation in ANSYS Workbench finite element analysis software; simulating the transformer body and the oil tank to obtain a simulation structure; and applying a load to the simulation structure and performing calculation and analysis to obtain an analysis result. According to the method, finite element mesh generation is carried out in ANSYS Workbench finite element analysissoftware, loads are applied to a simulation structure for analysis, the accuracy of strength simulation analysis of the locomotive main transformer oil tank is guaranteed, and a mass point and a cushion block are connected in a binding contact pair mode to be simulated into an overall structure. The cushion block of the overall structure is in friction contact connection with the oil tank, the supporting effect of the transformer body on the tank cover and the side wall of the tank body of the oil tank can also be simulated in the vacuumizing state, the calculation process is simplified, andwhen the oil tank bears the acceleration load in a certain direction, the separation trend in the reverse direction can also be simulated.

The invention relates to a calculation method for bolt connection internal force in a metal-composite mixed structure at variable temperatures. The calculation method comprises the steps that 1, primary engineering analysis on the stress form is conducted; 2, material nonlinearity analysis on the metal-composite mixed structure is conducted; 3, contact nonlinearity analysis on the metal-composite mixed structure is conducted; 4, entity finite element mesh generation is conducted on the metal-composite mixed structure; 5, temperature loads are applied to the metal-composite mixed structure; and 6, static solution is conducted on the metal-composite mixed structure, bolt internal force under the temperature loads is obtained, and stress and strain values of a high stress area of the metal-composite mixed structure are determined. The method for determining and calculating the connection internal force of the metal-composite mixed structure is provided for the metal-composite mixed structure at different temperatures, the defects of a traditional experience method are overcome, and the calculation method is simple, convenient to operate and high in calculation precision.

The invention discloses a finite element mesh generation method for a honeycomb sandwich panel with pit defects. The finite element mesh generation method comprises the following steps: calculating the number of honeycombs of the honeycomb sandwich panel in length and width directions; constructing geometric models of various components of the honeycomb sandwich panel; generating a geometric model of the honeycomb sandwich panel; generating a honeycomb sandwich panel finite element mesh model; generating a pit defect; and acquiring a finite element mesh model of the honeycomb sandwich panel with the pit defect. According to the finite element mesh generation method, the finite element mesh model of the corresponding honeycomb sandwich panel can be automatically constructed as long as the boundary dimension of the honeycomb sandwich panel with the pit defect is given; as long as pit defect parameters are given, the finite element mesh model of the corresponding honeycomb sandwich panel with the pit defect can be automatically constructed; and thus, technical support can be provided for efficiently carrying out comparative analysis work on the influence of different pit defect parameters on the mechanical properties of the honeycomb sandwich panel, and the method is particularly suitable for being applied to mechanical property evaluation of the honeycomb sandwich panel with the pit defect.

The invention discloses a numerical simulation calculation method for a multi-layer and multi-pass welding process of a header tube socket. The method comprises the following steps: S1, establishing a three-dimensional thermal coupling calculation model of a tube socket, a header and a welding seam, and performing finite element mesh generation on a solid model of the header tube socket weldment to form a plurality of mesh units of the solid model; S2, setting initial conditions and boundary conditions of the welding model; S3, determining a heat source equation and welding parameters used by the saddle-shaped welding seam of the header pipe base; and 4, submitting and solving the task, and carrying out post-processing and analysis. According to the structural features of the saddle-shaped welding seam of the tube socket header, the entity model is established in a targeted mode, grids are divided in a regional mode, welding heat source parameters are corrected, the change rule of a post-welding temperature field and a stress-strain field can be predicted, and the actual saddle-shaped welding seam welding process is guided.

The invention discloses a finite element analysis method for the stress performance of a high-strength double-angle-steel combined section component. The finite element analysis method comprises: establishing a geometric model of a double-angle-steel cross-shaped combined section component; carrying out finite element mesh generation on the geometric model; applying constraints to the geometric model; selecting an end plate area to apply load; and gradually performing loading and solving by adopting an arc length method. The relative difference between the bearing capacity limit value calculated by the analysis method and the bearing capacity limit value obtained by the test is basically controlled within 10%; from the comparison of two aspects of a component damage mode and ultimate bearing capacity, the finite element model established by the method can be used for analyzing the stress performance of the double-angle steel combined component, and reference is provided for the designof a power transmission tower.