17 results about "Finite element algorithm" patented technology

The application provides a metal mask and a pattern selection method, device and storage medium thereof. The pattern selection method comprises: processing n different transition region images to obtain corresponding n groups of pattern design parameters for representing the pattern distribution state of the transition region; determining minimum equivalent regions based on the n groups of pattern design parameters, performing mechanical simulation on each minimum equivalent region by using a finite element algorithm to obtain n groups of material properties corresponding to n different metal masks; performing mechanical simulation on the n different metal masks by using the finite element algorithm based on the n groups of material properties to obtain n groups of first deformation variables corresponding to the n different metal masks; determining at least one group of target first deformation variables from the n groups of first deformation variables, and outputting a transition region image corresponding to the target first deformation variable. The computer simulation test method can shorten the product development cycle, reduce the manufacturing cost and improve the research and development efficiency.

The present application relates to the technical field of geophysical electromagnetic data exploration, in particular to a three-dimensional time-frequency domain electromagnetic joint inversion method based on finite element algorithm. The method obtains time domain and frequency domain electromagnetic observation data of the region to be measured respectively; the region to be measured is profiled to obtain a non-structural tetrahedral mesh to construct a time-frequency domain inversion initial model; the time-frequency domain inversion initial model is forward calculated to obtain time domain and frequency domain electromagnetic response data; time domain electromagnetic data residuals and frequency domain electromagnetic data residuals are obtained, and their corresponding adaptive weights are obtained respectively to establish a joint inversion objective function; the joint inversion objective function is iteratively solved to calculate the update vector of the inversion initial model; the inversion initial model is iteratively updated until the set condition is reached, and the time-frequency domain electromagnetic joint inversion is completed. The present application effectively improves the accuracy of three-dimensional inversion through joint inversion, thereby enhancing the practical effect of three-dimensional inversion.

The invention discloses a hyperboloid cross cable net shape-finding analysis and modular ring truss structure construction method, which comprises the following steps of: analyzing a static balance state of a cable net by adopting a nonlinear finite element algorithm based on a geometric model and a pretension force of a current iteration round; obtaining an internal force value and a node deformation coordinate of each cable section, calculating a standard deviation and a variable coefficient of internal force distribution according to the standard deviation and the variable coefficient, if the standard deviation and the variable coefficient are not converged to a threshold value, analyzing the influence of node coordinate change on the cable force through a sensitivity matrix, solving an optimal coordinate adjustment amount, updating a geometric model, synchronously adjusting a pre-tension force, starting a new round of iteration, and cyclically performing the process, and the standard deviation and the variable coefficient both meet the convergence requirements. And finally, outputting an optimized cable net geometrical shape and an internal force distribution result, and providing an accurate basis for actual construction. According to the technical scheme, the overall process efficiency of the double-curved-surface crossed cable net structure from digital design to industrial construction can be systematically improved.

The invention provides a nuclear reactor vapor-liquid two-phase flow numerical simulation method and device, and relates to the technical field of computational fluid mechanics, and the method comprises the steps: converting a spatial partial derivative term of a vapor-liquid two-phase flow model into a spatial discrete form through discontinuous finite element discretization; on the basis of a Roe type format, physical quantities exchanged between adjacent discrete units are determined; reconstructing a high-order slope in the discrete unit by using a slope limiting function to obtain physical quantity distribution in the discrete unit; based on physical quantity distribution in each discrete unit, a high-order difference format is adopted to discretize a time item, and a discrete equation set changing along with time is obtained; and constructing a preprocessing jacobian matrix through automatic differentiation, and iteratively solving the discrete equation set based on the preprocessing jacobian matrix to obtain a numerical simulation result. According to the method, the discontinuous finite element algorithm, the Roe type numerical flux algorithm and the high-order slope reconstruction algorithm are combined, so that the behavior of the vapor-liquid two-phase flow of the nuclear reactor under the abnormal working condition can be simulated more accurately.

The invention discloses a method for obtaining an earthquake response result of a pipeline structure and a related device, and relates to the technical field of nuclear power station safety engineering.The method comprises the steps that firstly, a nuclear island main loop structure and the pipeline structure are independently modeled through a finite element algorithm and a pipeline special algorithm, and customized analysis of structures with different characteristics is achieved; thirdly, calculating the response of a connectable point of a main loop structure under a real seismic oscillation time history, converting the response into a seismic response response spectrum, and concentrating complex time history information into spectrum data representing the maximum response of the point; and then, the obtained earthquake response response spectrum is applied to the corresponding connection points of the pipeline structure model, and the earthquake response of the main loop structure is accurately transmitted to the pipeline structure model, so that the state of the pipeline structure attached to the main loop structure in an actual earthquake is physically and truly simulated. Finally, the seismic response result of the pipeline structure model obtained based on the accurate input also has high accuracy.

The application discloses a low-stress fiber loop design method based on finite element simulation and belongs to the technical field of computer-aided design. The low-stress fiber loop design method of the application is aimed at the jump-turn transition area of an octupole symmetrical winding method fiber loop, constructs a jump-turn geometric model containing cross-layer jump-turn optical fibers and regular layer winding optical fibers, establishes a local Cartesian coordinate system and adopts a sweeping method to perform structured grid division, applies a fixed constraint to the regular layer winding optical fibers, applies tension and opposite displacement loads to the cross-layer jump-turn optical fibers to simulate jump-turn deformation, considers the nonlinear mechanical behavior of the optical fibers, solves equivalent stress distribution by adopting a nonlinear finite element algorithm, obtains an optimal transition path based on the equivalent stress distribution fitting, and adjusts the jump-turn angle and wrapping buffer materials. The application can truly restore the local stress state under the jump-turn scene, effectively reduces the stress concentration of the jump-turn transition area, and improves the design reliability and mechanical stability of the fiber loop.

The application relates to the technical field of high-speed electronic design automation simulation, and further relates to a via simulation method and system, a computer device and a storage medium. The method comprises the following steps: decomposing a multilayer via structure into multiple units, each unit comprising a cavity formed by a pair of plates and at least one via segment passing through the cavity; calculating an inter-plate impedance matrix of the cavity in each unit according to a finite element algorithm; calculating a coupling capacitance between the cavity and the via segment in each unit according to an analytical method; constructing multiple pi-type coupling circuit models according to the inter-plate impedance matrix and the coupling capacitance corresponding to each unit; cascading the pi-type coupling circuit models of each layer to obtain a multilayer via cascaded circuit model; and calculating scattering parameters according to the multilayer via cascaded circuit model. The method accurately and efficiently simulates a multilayer structure comprising vias, traces and an actual power ground plane, and realizes collaborative design of signal integrity and power integrity.

The invention discloses an offshore booster station multi-rod connection complex node fatigue evaluation method, which comprises the following steps: establishing a three-dimensional rod system finite element analysis model of an offshore booster station multi-rod connection integral structure, and determining unfavorable nodes in the offshore booster station multi-rod connection integral structure; calculating a force / moment distribution coefficient of each rod piece at the node; calculating stress concentration coefficients of different support rod weld toes at the unfavorable nodes; the nominal stress of each rod piece at the unfavorable node is calculated according to the force / torque distribution coefficient of each rod piece; the product of the stress concentration coefficient and the nominal stress is hot spot stress; the fatigue life of all rod piece weld toes of the unfavorable nodes is obtained by combining hot spot stress with a salt mist area S-N curve; according to the method, a theoretical algorithm and a finite element algorithm are combined, the defect that a multi-bar system complex node fatigue evaluation method is not detailed in specifications is overcome, the problems that a simple evaluation method is unreliable in result and large in deviation are solved, and guidance is provided for structural design safety and light weight of the offshore booster station.

This invention discloses a method, apparatus, electronic device, and storage medium for modeling forward EEG problems. The method includes: segmenting brain tissue structures based on brain structural images; dividing the head domain into a global mesh based on the segmented brain tissue structures; creating a skin-like electrode template based on the electrode line distribution of skin-like electrodes; locally refining the mesh based on the center position, shape, and electrode line cross-sectional diameter of the skin-like electrodes to obtain a head model; obtaining a skin-like electrode model on the head model with electrode locations based on the skin-like electrode template; obtaining a corresponding source model based on mesh division of the cerebral cortex surface; and constructing a personalized EEG forward EEG model using the finite element method based on the head model, source model, and skin-like electrode model. This invention addresses the problem of complex electric field distribution in the scalp region covered by the electrodes due to the complex fractal serpentine mesh structure of skin-like electrodes, thus improving the modeling accuracy of forward EEG problems.

The invention discloses a field-circuit coupling method and device based on a time domain hybrid finite element method and a delay insertion method. The method comprises the following steps: discretizing a three-dimensional electromagnetic structure through a tetrahedral mesh, reading the port characteristics of an IBIS model, constructing an electromagnetic field equation based on a hybrid finite element algorithm of tree-cotree decomposition, and reducing the order through a modal order reduction technology after discretization; an electromagnetic port is equivalent to a series structure, the series structure is coupled with an IBIS model equivalent circuit to construct an EM-IBIS system, and a circuit equation is solved through an LIM method; a self-adaptive local time step length strategy is adopted, an electromagnetic part adopts large-step-length propulsion, and a circuit part is subjected to self-adaptive subdivision iteration in each electromagnetic step length until a convergence condition is met. Simulation precision and efficiency are balanced, full-link simulation is supported, the design reliability of a high-speed and high-density electronic system can be improved, and the method has important application value in scenes such as signal integrity, power supply integrity and electromagnetic compatibility optimization.

This invention provides a method and system for simulating hydraulic fracture propagation with non-uniform perforation morphology, belonging to the field of hydraulic fracturing technology. The method includes: classifying the parameters of the fracturing engineering model based on various basic models to obtain parameter sets for each basic model; constructing corresponding basic models based on the parameter sets of each basic model; wherein the basic models include a three-dimensional multi-cluster non-uniform perforation fracturing geological model, a hydraulic fracture propagation model, and a fracturing fluid flow distribution model; coupling the basic models using a finite element method to obtain a simulation model; and simulating candidate fracturing perforation design schemes for the target fracturing project based on the simulation model, outputting the simulation results. This invention achieves precise simulation and optimization of the hydraulic fracture propagation process, significantly improving the scientific nature and reliability of fracturing design, and providing more reliable theoretical guidance and decision support for the fracturing stimulation of unconventional oil and gas reservoirs.

The application discloses an extrusion deformation state detection method and system, electronic equipment and a storage medium, and relates to the technical field of extrusion deformation detection. The method comprises the following steps: determining the deformation calculation method corresponding to each node / integration point according to the initial data of each time step in a time step iteration manner, and then determining the extrusion deformation data of the target measured object at the time step according to the corresponding deformation calculation method of each node / integration point, and obtaining the extrusion deformation state of the object at all time points through time step iteration. The application selects the corresponding deformation calculation method for deformation operation according to different nodes / integration points, retains the operation advantages of the time-space stable node integration algorithm and the node smooth finite element algorithm, and can realize high-precision and high-efficiency extrusion deformation state detection.

The invention provides a metal mask, a pattern selection method and device thereof and a storage medium. The pattern selection method comprises the following steps: processing n different transition area images to obtain corresponding n groups of pattern design parameters used for representing the pattern distribution state of the transition area; determining minimum equivalent areas based on the n groups of pattern design parameters, and performing mechanical simulation on each minimum equivalent area through a finite element algorithm to obtain n groups of material attributes corresponding to the n different metal masks; based on the n groups of material attributes, performing mechanical simulation on the n different metal masks through a finite element algorithm to obtain n groups of first deformation quantities corresponding to the n different metal masks; and determining at least one group of target first deformation quantity from the n groups of first deformation quantity, and outputting a transition area image corresponding to the target first deformation quantity. According to the embodiment of the invention, a full-computer simulation test mode is adopted, the product development period can be shortened, the manufacturing cost is reduced, and the research and development efficiency is improved.

The invention belongs to the technical field of process improvement, and provides a forge piece manufacturing process improvement optimization method which comprises the following steps: performing static data acquisition on a forge piece under the current working condition, performing a Deform-3D-based rigid-plastic finite element algorithm, constructing a rigid-plastic finite element simulation model, and constructing a simulation model; the influence of different forging parameters on the forging forming quality in the forging process is simulated, and the defect risk of the forging in the simulated forging process under the forging parameters is evaluated; if the defect risk is low, extracting a defect risk coefficient corresponding to the low-risk parameter, and determining a simulation optimal parameter; performing test operation on the forge piece based on the simulation optimal parameter, presetting a test operation time period, and judging whether the qualification rate of the forge piece is abnormal or not by performing quantitative deviation analysis on the actual qualification rate of the forge piece in the test operation time period; according to the method, aiming at the abnormal condition of the qualified rate, a quantitative correction model is established through the mold abrasion loss and the surface roughness increment, and the friction coefficient is accurately corrected to obtain an actual optimal parameter.

The invention discloses an inverse finite element deformation reconstruction method based on single-sided strain-variable temperature curvature. The method comprises the following steps: establishing a variable temperature model of an aircraft thin plate structure; establishing a relation matrix of the variable temperature field and the variable temperature curvature to obtain the variable temperature curvature; obtaining theoretical values of strain, curvature and transverse shear strain of the upper surface of the aircraft thin plate structure; obtaining theoretical values of strain, curvature and lateral shear strain at the centroid of the inverse unit; constructing a weighted least square error function based on the single-sided strain-variable temperature curvature; obtaining an equation about a unit displacement vector; and solving to obtain a global displacement vector so as to realize deformation reconstruction. According to the method, high-precision deformation reconstruction under the condition that sensors are only arranged on the single side of the structure is realized through single-side strain and variable-temperature curvature information in combination with an inverse finite element algorithm; the problem that the reconstruction error is large due to insufficient data of a single-face sensor is effectively solved, and reliable technical support is provided for deformation reconstruction of a plate shell structure in the fields of aerospace and the like.

This invention discloses a gradient-combination crack-resistant diaphragm wall concrete self-constrained stress optimization design method. The method first constructs a BIM three-dimensional structural model including material properties, temperature gradient, and stress state through three-dimensional laser scanning and core sample testing. Then, based on the model, stress zoning is performed, and the self-constrained stress value and stress transmission attenuation coefficient of each zone are calculated. Next, an expansion agent ratio optimization model is established, and the stress redistribution under different dosage gradients is simulated using the finite element algorithm to screen the minimum effective dosage that meets the stress homogenization index. After verifying the crack resistance effect through dynamic simulation, the final mix design is output. This invention combines BIM technology with material gradient design, achieving precise control of the self-constrained stress of diaphragm wall concrete and active optimization of its crack resistance performance. It solves the technical problem that traditional homogeneous material design cannot adapt to complex stress distributions, significantly improving the durability and safety of diaphragm wall structures.

The invention relates to the field of structural health monitoring, particularly discloses a phased array plane deformation high-precision inversion method combining modal extension and an inverse finite element method, and aims to solve the problem that the traditional inverse finite element method is insufficient in displacement field inversion precision under the condition of sparse strain sensor layout. The method comprises the following steps of: firstly, constructing an experimental model and a simulation model, and respectively extracting displacement and strain modal data of a plurality of orders before the experimental model and the simulation model; secondly, a typical deformation working condition is applied to the experimental model, and sparse strain data are collected; then, expanding the sparse strain field into a full strain field by using a modal expansion technology; then, inputting the expanded full-field strain field into an inverse finite element algorithm, and carrying out inversion to obtain full-field displacement distribution of the structure; and finally, verifying the effectiveness of the method by comparing the inversion displacement with the real displacement. According to the method, the problem of information loss of sparse strain data is effectively solved through the modal extension technology, and the displacement inversion precision of the inverse finite element method under the sparse measurement condition is remarkably improved. Experimental results show that the method can improve the array plane inversion precision of the phased array from 30%-40% of a traditional method to more than 90%, and can meet the requirements of the phased array antenna for array plane deformation high-precision perception and electrical performance compensation in actual engineering.