Patents
Literature
78 results about "Coarse mesh" patented technology
Efficacy Topic
Property
Owner
Technical Advancement
Application Domain
Technology Topic
Technology Field Word
Patent Country/Region
Patent Type
Patent Status
Application Year
Inventor
Coarse Wire Mesh is a fence or an obstruction that prevents access and movement. It is made up of pre-crimped carbon steel, spring steel, stainless steel, galvanized mil steel wires or connected strands of fiber or other flexible materials and appears like a net or web possessing woven strands.
Adaptive octree three-dimensional magnetic method inversion method fused with abnormal region recognition
ActiveCN120703853AElectric/magnetic detectionComplex mathematical operationsCluster algorithmCoarse mesh
The invention discloses a self-adaptive octree three-dimensional magnetic method inversion method fused with abnormal region recognition, and belongs to the technical field of three-dimensional magnetic method data inversion processing. Comprising the steps that initial inversion is rapidly completed on a coarse grid, the overall contour of an underground structure is obtained, a fuzzy c-means clustering algorithm is introduced, and a target area with significant magnetic anomaly is automatically extracted from a coarse solution; and constructing a multi-level octree grid in the extracted abnormal region to realize fine subdivision of the complex geological boundary, and further executing high-precision inversion by using a fine model as a new starting point. The adaptive octree grid has the characteristics of high efficiency, small grid number and small data fitting difference. The process of coarse inversion, intelligent identification, local refinement and fine inversion can be circularly executed as required, and computing resources are dynamically allocated. Compared with a traditional global fine grid scheme, the inversion process has the advantages that the inversion precision is maintained and even improved, and meanwhile, the number of grid units is remarkably reduced.
Owner:JILIN UNIVERSITY
Multi-group steady-state neutron transport coarse net node block global efficient solving method and system
ActiveCN121167081ANuclear energy generationComplex mathematical operationsCoarse meshNuclear reactor physics
The invention belongs to the technical field of nuclear reactor physical calculation, and particularly discloses a multi-group steady-state neutron transport coarse mesh node global efficient solving method and system, which effectively fuse and exert the advantages of a coarse mesh node method and a Newton-Kralov method. A general coarse mesh segment transport calculation model suitable for various polyhedral segments is constructed, high-precision and high-efficiency transport scanning calculation is realized under sparse segments, the number of variables is greatly reduced, and the calculation scale of single transport scanning is reduced; a Newton-Kralov subspace global solution framework is established, a global solution variable is selected based on a variable coupling relationship of a coarse network nodal method, a linear equation corresponding to a Newton step length is solved by using a Kralov subspace method, and the Newton step length is used for updating the global solution variable to realize rapid and efficient convergence. On the premise of ensuring the calculation precision, the calculation efficiency is remarkably improved, and the calculation scale is reduced, so that the method is particularly suitable for the problem of large-scale and high-dominance-ratio neutron transportation.
Owner:HUAZHONG UNIV OF SCI & TECH
Mesh refinement
A computer-implemented method comprising: generating a main graph based on a coarse mesh, the coarse mesh comprising a plurality of mesh elements arranged to fill an area or volume defined by a geometry; generating a vertex graph based on the geometry, wherein the vertex graph comprises vertex graph nodes corresponding to vertices of the area or volume defined by the geometry and vertex graph edges corresponding to links between the vertices in the geometry; generating, using a first graph neural network (GNN), an embedding of the vertex graph; generating, using a second GNN and based on the main graph and the embedding of the vertex graph, a prediction indicative of a refinement of the coarse mesh for generating a refined mesh.
Owner:FUJITSU LTD
Display backboard stamping process optimization method and system
PendingCN121980837AHigh precisionImprove efficiencyGeometric CADDesign optimisation/simulationElement modelCoarse mesh
The invention provides a display backboard stamping process optimization method and system, and relates to the technical field of process optimization. According to the method, multi-area differential mesh division is carried out on a plate finite element model, fine meshes are adopted for a high-strain small-curvature area and a high-strain area, rough meshes are adopted for a trimming allowance area, and medium meshes are adopted for other areas. The deformation behavior of the key area is accurately captured, and the reliability of simulation prediction is remarkably improved under the same computing resource. And then, reverse compensation iterative correction and rapid convergence are performed on the initial molded surface based on a springback prediction result to obtain an optimized molded surface model, and source control is directly performed for springback errors, so that the number of times and period of mold testing which traditionally depends on experience are greatly reduced. According to the method, through linkage of simulation and real-time sensing data, dynamic optimization and closed-loop control of the process window are achieved, and the forming quality and production stability of the display backboard are effectively improved.
Owner:江苏金利美工业科技有限公司
Multi-stage sorting device for agricultural products
Owner:HONGJIANG YUANJIANG E-COMMERCE CO LTD
Finite difference travel time calculation method based on cubic spline interpolation and coarse mesh technology
The invention discloses a finite difference travel time calculation method based on cubic spline interpolation and a coarse mesh technology. The finite difference travel time calculation method comprises the following steps: establishing and reading a fine mesh model; performing primary division, namely sparse processing, on grids of the fine grid model, and extracting coarse grids; nodes of the coarse mesh model are classified, narrow-band points are initialized, and travel time is initialized; starting circulation, selecting a minimum travel time point from the narrow band, changing the attribute of the minimum travel time point into an active point, judging the attributes of four points around the active point so as to carry out corresponding processing, and circulating until the narrow band is empty; performing cubic spline interpolation on the travel time value of the coarse mesh to obtain a travel time value of a fine mesh model; and outputting a fine grid travel time value. According to the method, the cubic spline interpolation method and the coarse mesh technology are combined, so that the travel time calculation efficiency is improved, the memory occupied during calculation is greatly reduced, the calculation precision is kept, and the calculation result is stable while being close to original data.
Owner:SOUTHWEST JIAOTONG UNIV
Method and device for predicting gas-water two-phase productivity of fractured horizontal well
PendingCN120832749AData processing applicationsDesign optimisation/simulationCoarse meshGaussian random field
The invention discloses a method and a device for predicting gas-water two-phase productivity of a fractured horizontal well. The method comprises the following steps: establishing a target block heterogeneous permeation Gaussian random field model and a target well reservoir geologic model; establishing a corresponding coarse scale grid, a fine scale grid and a dual control volume grid based on the target well reservoir geologic model; determining a dual basis function for mutual mapping of the coarse-scale grid and the fine-scale grid according to the coarse-scale grid, the fine-scale grid and the dual control volume grid; discretizing a control equation corresponding to the coarse-scale grid, and calculating pressure in cracks and a matrix on the coarse grid according to the heterogeneous permeation Gaussian random field model of the target block; according to the dual basis function, the pressure in the cracks and the matrix on the coarse grid is mapped to the fine-scale grid; and determining the gas-water two-phase productivity of the target well according to the cracks on the fine-scale grids and the pressure in the matrix.
Owner:CHINA NAT PETROLEUM CORP
Ship sitting pier head structure strength evaluation method
The invention provides a ship pier head structure strength evaluation method, which aims at the problem that a ship bow structure is easy to damage or deform under a ship pier falling working condition, obtains an accurate rigidity coefficient of a docking block through actual measurement and conversion, and establishes a complete real ship finite element model in an evaluation range to reflect accurate mass distribution and rigidity. Coarse grid and fine grid grading evaluation is adopted, the efficiency is improved while the calculation precision is guaranteed, coarse grid analysis is used for obtaining docking block counter-force, fine grid analysis can consider actual counter-force distribution in contact with a docking block, and the yield strength and buckling strength evaluation safety coefficient of the ship bow structure is provided; the damage or deformation risk of the ship docking pier falling structure can be systematically and accurately evaluated, the ship pier falling optimization design is guided, and the ship construction period can be shortened.
Owner:CSC JINLING SHIPYARD
Transmission housing assembly sealing and strength calculation method and storage medium
The invention discloses a sealing and strength calculation method for a transmission housing assembly. The method comprises the following steps: constructing a strength analysis script for generating a complete Mechanical model under a coarse grid; based on the strength analysis result of the complete model under the coarse mesh, importing the displacement of the cutting boundary under each load step, and generating a strength analysis script of the Mechical sub-model; a project management file of the ANSYS is called, a batch processing script of the ANSYS is generated so as to calculate the sealing performance and the strength of the transmission shell assembly, PyAnsys is used for conducting 3D real-time checking on a result, automatic filling of data and pictures is conducted according to a report template specified in advance, and report output is completed. The method is simple and rapid in operation, good in adaptability to shells of the same type, and capable of effectively improving the calculation result precision and shortening the simulation period.
Owner:NANJING BANGQI AUTOMATIC TRANSMISSION CO LTD
Method for calculating hot spot stress at end part of horizontal rod piece for supporting transverse bulkhead
PendingCN121167897AGeometric CADDesign optimisation/simulationStress concentrationRelative displacement
The invention relates to a method for calculating the hot spot stress at the end part of a horizontal rod piece for supporting a transverse bulkhead, which belongs to the field of ship engineering structure design, and comprises the following steps of: calculating through a coarse mesh finite element to obtain node displacement, and determining the hot spot position at the end part of the rod piece; relative displacements of all the horizontal rod pieces are calculated, and then nominal stresses of all the horizontal rod pieces are calculated; or the nominal stress is obtained directly according to the coarse mesh finite element calculation result; combining each stress concentration coefficient corresponding to each hot spot; and calculating the hot spot stress. The invention provides a hot spot stress simplified calculation method based on a coarse grid calculation result (nominal stress) and a stress concentration coefficient, which is beneficial to improving the evaluation efficiency.
Owner:RES INST 708 OF CHINA STATE SHIPBUILDING CORP
High-order electromagnetic field simulation method based on triangular mesh
The invention discloses a triangular mesh-based high-order electromagnetic field simulation method, and belongs to the field of computational electromagnetism. In order to solve the problems of significant numerical dispersion and phase error accumulation when an existing triangular mesh time domain finite difference method is used for processing a complex geometric structure, the method comprises the following steps: firstly, introducing a first additional loop on a basic triangular mesh, and combining with a first optimization coefficient to construct a high-order model; and a second additional loop is further introduced, and an optimization model is constructed in combination with a second optimization coefficient, so that the phase error is effectively inhibited under the coarse mesh, and high-precision electromagnetic simulation of a large-scale polygon structure is realized.
Owner:ANHUI UNIV
Forage cutting device for agricultural cultivation
The utility model relates to the technical field of forage cutting, and discloses a forage cutting device for agricultural cultivation, which comprises a platform, the top of the platform is matched with a conveyor belt and a rear side plate, an electric push rod extends to enable a pressing plate to press the top of forage, and a telescopic column extends to enable a rotating plate to press the front side of the forage; the forage can be compressed and shaped, so that the forage is prevented from being in a loose state to influence the cutting of the forage, and the forage can be conveniently cut; when air in the machine shell is pumped into the processing part through the axial flow fan, suspended particulate matter in the air can be filtered through the coarse mesh screen capable of being cleaned by the scraper blade and the fine dust filter screen in the processing part, and therefore suspended matter generated when forage is cut in the air in the machine shell can be processed; suspended matters are prevented from diffusing into a working environment from the interior of the machine shell when the forage cutting device discharges the forage, and a protection effect is achieved on respiration of workers.
Owner:DATONG LANGZHONG PLANTING PROFESSIONAL COOP
Multi-initial-value partitioned nonlinear inversion method for fracture morphology parameters
The present application relates to a kind of crack morphology parameter's multiple initial value subinterval nonlinear inversion method, it is applied to petroleum technical field, the multiple initial value subinterval nonlinear inversion method for explaining crack morphology parameter based on crack front fiber strain includes: based on three-dimensional displacement discontinuity method, crack front fiber strain calculation model is established;According to crack parameter and the crack front fiber strain calculation model, predicted strain is calculated;According to the strain residual of measured fiber strain and the predicted strain, nonlinear least square inversion model with parameter boundary constraint is established;The crack parameter includes crack half crack length, crack height, crack net pressure in crack, crack vertical offset;Under coarse grid division, multiple initial values are set in parameter feasible region and are carried out parallel optimization, and first candidate solution is obtained;Again with the crack height of the first candidate solution as center, crack height feasible region is recursively divided into multiple subintervals.
Owner:CHINA UNIV OF PETROLEUM (EAST CHINA)
Method and device for predicting full-core fouling deposition based on porous medium model
ActiveCN121257118BNuclear energy generationDesign optimisation/simulationCoarse meshPressurized water reactor
The application provides a full-core fouling deposition prediction method and device based on a porous medium model. The method comprises the following steps: S1, modeling a pressurized water reactor core as a porous medium model and performing regular coarse grid division; S2, solving the porous medium model based on a core power distribution obtained in a previous iteration step to obtain a flow field and a phase field distribution at the current iteration step; S3, calculating a fuel rod cladding surface temperature based on the core power distribution and the flow field and the phase field distribution; S4, calculating a phase change mass transfer rate by using a boiling phase change rate model based on the cladding surface temperature and local thermal parameters; S5, calculating a fouling deposition rate by using a deposition model based on total mass balance based on the phase change mass transfer rate; S6, calculating a fouling deposition mass and a boron compound mass according to the fouling deposition rate; and S7, performing neutron calculation by taking the fouling deposition mass and the boron compound mass as input to obtain an updated core power distribution.
Owner:SHANGHAI NUCLEAR ENGINEERING RESEARCH & DESIGN INSTITUTE CO LTD
Layered search three-dimensional airspace path planning method and system based on adaptive resolution grid
The invention particularly relates to a hierarchical search three-dimensional airspace path planning method and system based on an adaptive resolution grid. The method comprises the following steps: constructing a corresponding multi-resolution grid model based on a three-dimensional grid map; global path planning is carried out on the coarse resolution grids, coarse paths of all coarse grid nodes are determined, and a coarse path sequence is constructed; performing non-overlapping segmentation on the coarse path sequence; planning local windows matched with the fine-resolution grids, and determining window entrance and exit points corresponding to the local windows; performing obstacle recognition on each local window based on the fine resolution grid, calling a corresponding path generation strategy according to an obstacle recognition result of the local window, and determining a local refined sub-path corresponding to each local window; and splicing the path information of each local window in sequence to obtain a path planning result. According to the method, efficient and reliable path planning of a large-scale and complex three-dimensional airspace environment can be realized.
Owner:ZHEJIANG SCI RES INST OF TRANSPORT +1
A method for three-dimensional positioning of a seismic source based on multi-channel amplitude ratio
The application discloses a three-dimensional positioning method of a seismic source based on a multi-channel amplitude ratio. The method obtains waveform data of the same event on at least four sensor channels and spatial coordinates of the sensors, pre-processes the waveforms, determines an event window corresponding to the event, extracts amplitude indicators of each channel in the event window and performs channel consistency correction, constructs an amplitude logarithm ratio observation on an arbitrary channel based on an exponential decay model to eliminate a source intensity factor, and further forms a constraint related to a distance difference of the seismic source and the sensor. A redundant channel constraint set is further constructed, and an abnormal channel is down-weighted or removed. A weighted nonlinear least square is used in combination with an iterative reweighted least square or a robust loss function to solve the problem, a residual threshold is determined and is updated with iteration. A plurality of candidate solutions are obtained by solving a multi-initial value or a coarse grid initial value in a preset feasible region, and an optimal solution is output. The method reduces the dependence on the arrival time picking, and can be used for microseismic monitoring, acoustic emission positioning and underground engineering safety monitoring.
Owner:FEICHENG MINING GRP SHANXIAN ENERGY +1
A treatment device for restaurant sewage
ActiveCN119954336BFatty/oily/floating substances removal devicesMultistage water/sewage treatmentOil and greaseCoarse mesh
The present invention discloses a treatment device for catering sewage, specifically relating to the field of sewage treatment technology, including a treatment box, wherein the upper portion of the inner surface of the treatment box is provided with a kitchen waste separation structure, the middle portion of the inner surface of the treatment box is provided with a sedimentation separation structure, the portion of the inner surface of the treatment box located in front of the sedimentation separation structure is provided with a grease separation structure, and either side of the treatment box is fixedly mounted with an oil removal auxiliary structure that is in communication with the inner cavity of the grease separation structure. The treatment device for catering sewage described in the present invention separates large pieces of kitchen waste through a coarse mesh screen in an L-shaped inclined plate one, further precipitates them in an L-shaped inclined plate two through the action of a slow flow plate, and separates these suspended solids through the action of a suspended solids separation structure, and further, through the cooperation of an aeration component and an air pump provided at the bottom of the grease separation chamber, the suspended emulsified oil is sent to the upper layer of the sewage and sent to the grease chamber through the action of an oil discharge component.
Owner:SUZHOU HENGYAN PURIFICATION EQUIP CO LTD
A composite cracking path calculation method based on matrix-free pixel finite element
The application provides a composite cracking path calculation method based on a matrix-free pixel finite element, in which pixels of a composite image are fine meshes of finite elements, and different pixel gray values represent different material components. After coarse-grained of the fine meshes, coarse meshes are formed, the boundaries of the material components are embedded into the interior of the coarse meshes to form embedded boundary elements. The stiffness matrix of the coarse mesh elements is calculated through Gaussian integration, and the overall stiffness is not assembled. The conditional conjugate gradient algorithm is used to solve the node displacement of the coarse mesh. Based on the node displacement of the coarse mesh, the node displacement of the fine mesh is obtained through interpolation, and then the stress of the fine mesh element is obtained. The maximum tensile stress criterion is used as the element failure criterion. After the element is damaged, the element area is regarded as a crack, and corresponding material elements are added to the image boundary to maintain the conservation of mass. The calculation method of the application occupies very little computer memory and greatly reduces the demand for hardware resources for cracking calculation.
Owner:SHANGHAI UNIV
A Vertical Support Analysis Method for Independent Tank of Type A Based on GeniE
The present invention relates to a method for analyzing the vertical support of a Type A independent liquid cargo tank based on GeniE, comprising the following steps: S1. Coarse mesh modeling, including the cabin part and the liquid tank part; S2. Vertical support modeling, including the support block part and the laminated wood part; S3. Constructing a coarse mesh analysis model; S4. Coarse mesh analysis: determining the working conditions and adding load conditions; loading the working conditions, selecting the analysis type "Tension / Compression Analysis", and analyzing to obtain the coarse mesh result R file; S5. Fine mesh modeling: taking the vertical support model for fine meshing to obtain a fine mesh analysis model; S6. Fine mesh analysis: selecting "Local Analysis" for analysis, reading the coarse mesh result R file in step S3 and loading it into the fine mesh analysis model; additionally defining a manual loading working condition, manually adding the laminated wood pressure to this manual loading working condition in the form of surface load and loading it well; after the analysis is completed, obtaining the fine mesh result R file, including the pressure load condition of the laminated wood.
Owner:JIANGNAN SHIPYARD (GRP) CO LTD
Design method for determining maximum hoisting weight of ultra-thin hoisting beam
This invention relates to the field of electronic digital data processing technology, specifically to computer-aided engineering calculation and numerical simulation data processing technology. This invention discloses a design method for determining the maximum hanging weight of an ultra-thin lifting beam. In incremental iterative solutions, the equivalent stress gradient and strain energy density are extracted in real time to calculate local instability characteristic values. When the rate of change of element strain energy density exceeds a threshold, a mesh reconstruction mechanism is triggered. The nodal displacement field and stress field are extracted as initial boundary conditions. The coarse mesh is split into a fine mesh, and the coordinates of newly added nodes are smoothly interpolated based on the minimum potential energy principle. The local and global mesh degrees of freedom are coupled and assembled to continue nonlinear buckling analysis iterations until the load-displacement curve shows an extreme point. The corresponding load is then extracted as the maximum hanging weight. This invention avoids stiffness matrix singularities and computational divergence caused by distortion of the fixed mesh in local instability regions, ensuring the computational convergence of determining the maximum hanging weight.
Owner:HENAN YULIAN COAL IND GROUP CO LTD
Coarse and fine mesh interpolation method and system for wall turbulence calculation
The invention relates to a thick and thin grid fast interpolation technology for wall turbulence calculation, and aims to solve the problems of large calculation amount and complex implementation process of an existing interpolation method. Half of the minimum grid spacing of the fine grids is used as a judgment standard, and interpolation modes are intelligently switched. For each fine grid point, when the distance between the fine grid point and the nearest coarse grid point is smaller than the standard, the physical value of the nearest coarse grid point is directly given to the fine grid point; otherwise, if the distance is greater than or equal to the standard, interpolation is carried out by adopting an inverse distance weighted average method. According to the method, half of the minimum fine grid scale is defined to serve as a standard for judging whether the fine grid point is directly assigned by the physical quantity on the nearest coarse grid amplitude point or not, and on the premise that it is ensured that physical information is not distorted, the complex calculation problem is simplified. The tedious calculation process in a traditional method is avoided, the algorithm complexity is effectively reduced, and the interpolation calculation speed and efficiency are remarkably improved.
Owner:ZHEJIANG UNIV
Self-adaptive grid generation method and device, electronic equipment and storage medium
ActiveCN121962533AReduce frequent changesrecognition stabilityDigital data protectionKnowledge based modelsCoarse meshHydrology
The invention provides a self-adaptive grid generation method and device, electronic equipment and a storage medium. The method comprises the steps that a water depth prediction field is obtained on a coarse grid through model deduction; the water depth gradient of the coarse grid is calculated, and an encryption index is weighted in combination with the distance to the dike and the prediction uncertainty of the model; performing local encryption on a to-be-encrypted parent unit determined according to the encryption index to generate a subunit; the water depth on the parent unit is transmitted to the subunits to serve as initial water depth, and local fine water depth is obtained on the subunits through model deduction; at the junction, the local fine water depth and the water depth of the coarse mesh are fused; transmitting the water depth of the fused subunits back to the parent unit according to area weighted average, and correcting the water depth of the subunits according to the water depth of the parent unit; and when the parent unit does not change any more, outputting the grid structure at the moment. According to the method, the problems that a grid encryption area is unstable and engineering reusable grids are difficult to output are solved.
Owner:ZHEJIANG YUANSUAN TECH CO LTD
A membrane cross-cut folding mechanism and its folding method
The application relates to the field of filter elements, in particular to a diaphragm transverse cutting and folding mechanism and a folding method thereof. The mechanism mainly comprises a diaphragm unwinding unit, a guide roller, a traction gripper, a cutting and hot pressing unit, a folding platform, a diaphragm lifting unit, a diaphragm and coarse mesh traction unit and a coarse mesh pressing unit. The traction gripper drags the continuous diaphragm to a proper length, the cutting and hot pressing unit is suitable for cutting and hot pressing the continuous diaphragm, the traction gripper drags the cut diaphragm to the folding platform, the coarse mesh pressing unit is suitable for pressing the coarse mesh and the diaphragm on the folding platform to adhere, the diaphragm and coarse mesh traction unit drags the coarse mesh and the diaphragm to move and position the folding point, the diaphragm lifting unit lifts the diaphragm end to the highest position and reversely moves synchronously with the diaphragm and coarse mesh traction unit, the diaphragm is bent around the folding center shaft, then the diaphragm lifting unit is lowered to the zero position and releases the diaphragm end, so that the folding of the single diaphragm is completed. The application solves the problem of low production line working efficiency caused by manual folding.
Owner:SHANGHAI FORESIGHT TECHNOLOGY CO LTD
A wind farm wake evaluation method, device, equipment and storage medium
ActiveCN115758935Bovercoming adaptabilityOvercome efficiencyDesign optimisation/simulationICT adaptationCoarse meshPhysical model
The application discloses a kind of wind farm wake evaluation method, device, equipment and storage medium, method includes: constructing physical model and generating coarse grid and fine grid;First calculation result and first flow field are obtained by CFD solution to coarse grid, and first flow field is as the initial flow field of fine grid;Actuator disc parameter is determined according to first calculation result;According to boundary condition, initial flow field and actuator disc parameter, the CFD solution based on actuator disc is carried out to fine grid to obtain second calculation result;Second machine site wind direction is constantly corrected according to second calculation result in second machine site wind direction Actuator disc orientation, until the difference between actuator disc orientation and second machine site wind direction is less than preset threshold, stop correction and obtain the wake parameter in each machine site and preset downstream range.The application corrects actuator disc orientation according to machine site wind direction, can more truly consider the influence of complex terrain and upstream wind turbine wake to downstream wind turbine, improve the accuracy and effectiveness of wind farm wake evaluation.
Owner:WINDEY ENERGY TECHNOLOGY GROUP CO LTD
Mechanical-thermal coupling simulation and structural optimization method and system for ultra-complex structures
The present invention discloses a method and system for mechanical-thermal coupling simulation and structural optimization of ultra-complex structures. The method comprises: generating parameters and data structures required for subsequent simulation and optimization for a given model and design domain; constructing a background coarse grid, seed points and radii, modeling a porous structure based on a Voronoi structure, and precalculating its stress field; calculating a density field, performing thermodynamic simulation on the generated porous structure based on the density field, the background coarse grid, and a shape function; querying the stress matrix corresponding to each seed point based on the obtained stress field, performing eigendecomposition and extraction on the stress matrix, and obtaining a weight matrix corresponding to the seed point; using a topology optimization method, updating control parameters through a GCMMA method based on sensitivity, thereby updating the porous structure and optimizing material distribution, and continuously optimizing until the change in control parameters is less than a threshold. The method can quickly and effectively solve the topology optimization problem of anisotropic porous structures under multi-physics field conditions.
Owner:ZHEJIANG UNIV
A bran powder screening and grading device
This utility model discloses a bran powder screening and grading device, belonging to the field of bran powder processing technology. It includes a processing box with a grading and screening mechanism inside and a storage mechanism outside. The beneficial effect of this utility model is that by incorporating the grading and screening mechanism, when the motor is turned on, the rotating shaft drives the base plate to rotate, which in turn drives the connecting rod to rotate the base, connecting pipe, and rotating screen. Multiple sets of the base, connecting pipe, and rotating screen are provided, thus achieving the effect of grading and screening. The stirring blades on the rotating screen help to evenly distribute the bran powder and accelerate its movement within the rotating screen. The fine mesh at the top initially screens out finer bran powder, while the coarse mesh at the bottom further screens out residues from the rice, thereby achieving grading. The screening is very precise, facilitating accurate grading of various components.
Owner:HUBEI WUHE AGRICULTURAL DEVELOPMENT CO LTD
Full-core dirt deposition prediction method and device based on porous medium model
ActiveCN121257118ANuclear energy generationDesign optimisation/simulationCoarse meshPressurized water reactor
The invention provides a method and a device for predicting full-core dirt deposition based on a porous medium model. The method comprises the following steps: S1, modeling a pressurized water reactor core into a porous medium model, and carrying out regularization coarse mesh division; s2, solving the porous medium model based on the reactor core power distribution obtained by the previous iteration step, and obtaining the flow field and phase field distribution under the current iteration step; s3, calculating the surface temperature of the fuel rod cladding based on the reactor core power distribution and the flow field and phase field distribution; s4, on the basis of the cladding surface temperature and the local thermal parameters, the phase change mass transfer rate is calculated through a boiling phase change rate model; s5, on the basis of the phase change mass transfer rate, calculating the dirt deposition rate by using a deposition model based on total mass balance; s6, calculating the deposition mass of the dirt and the mass of the boron compound according to the deposition rate of the dirt; and S7, taking the dirt deposition mass and the boron compound mass as input, and carrying out neutronics calculation to obtain updated reactor core power distribution.
Owner:SHANGHAI NUCLEAR ENGINEERING RESEARCH & DESIGN INSTITUTE CO LTD
An isogeometric topology optimization method based on online machine learning
The present invention belongs to the technical field related to structural optimization design and discloses an isogeometric topology optimization method based on online machine learning. The method comprises the following steps: S1 constructs an optimization model of the structure to be optimized and divides its design domain into a fine geometric grid and a coarse finite element grid; S2 performs regional division, performs regional density mapping based on the density of control points within the sub-regions, and calculates the flexibility of the corresponding sub-regions to obtain the sensitivity of each sub-region; S3 updates the control point and fine element density, extracts sub-region information to form a data set, trains the machine learning model, and adjusts the prediction; S4 determines whether the current number of iterations has reached the total number of iterations. If not, returns to step S2; otherwise, terminates. The present invention solves the problems of low computational efficiency and unsuitability for three-dimensional design in the topology optimization process.
Owner:HUAZHONG UNIV OF SCI & TECH
A method for calculating steady-state neutron diffusion in a hexagonal assembly pressurized water reactor core
ActiveCN116340709BImprove calculation accuracyImprove computing efficiencyNuclear energy generationDesign optimisation/simulationNeutron diffusionCoarse mesh
The application discloses a kind of hexagonal assembly pressurized water reactor core steady-state neutron diffusion calculation methods, using nonlinear iteration strategy to carry out steady-state neutron diffusion calculation: obtain effective multiplication factor and block average neutron flux density by global hexagonal block coarse mesh finite difference method (CMFD);By local block expansion method (NEM), the accurate neutron flow density of each surface is obtained, the block coupling correction factor is updated to correct the block average neutron flow density obtained by CMFD, to ensure the high-order accuracy of the calculation result;Wherein, local NEM uses the method of conformal mapping, hexagonal block is conformally mapped into rectangular block, and non-physical singular term caused by transverse integration is avoided;Transverse leakage term uses first-order step approximation, and the neutron flow slope is estimated by neutron flux density.The method of the application is suitable for hexagonal assembly pressurized water reactor core physical calculation, has higher calculation precision and calculation efficiency, and meets the engineering application demand of hexagonal assembly pressurized water reactor.
Owner:XI AN JIAOTONG UNIV
A coarse-fine grid interpolation method and system for wall turbulence calculations
The application relates to a coarse-fine grid fast interpolation technology for wall turbulence calculation, aiming at solving the problems of large calculation amount and complex implementation process of an existing interpolation method. Half of the minimum grid spacing of a fine grid is used as a judgment standard to intelligently switch the interpolation mode. For each fine grid point, when the distance between the fine grid point and the nearest coarse grid point is less than the standard, the physical value of the nearest coarse grid point is directly assigned to the fine grid point; otherwise, if the distance is greater than or equal to the standard, the inverse distance weighted average method is used for interpolation. The method simplifies the complex calculation problem by taking half of the minimum fine grid size as the standard for judging whether the fine grid point is directly assigned by the physical quantity on the nearest coarse grid value point, under the premise of ensuring the distortionlessness of physical information. The method avoids the complicated calculation process in the traditional method, effectively reduces the algorithm complexity, and significantly improves the speed and efficiency of the interpolation calculation.
Owner:ZHEJIANG UNIV