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31results about How to "Reduce computing memory" patented technology
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Electromagnetic scattering analysis method for metal complex inhomogeneous medium mixed target
ActiveCN103425864AFast solutionReduce computing memorySpecial data processing applicationsElectric fluxAggregation factors
The invention discloses an electromagnetic scattering analysis method for a metal complex inhomogeneous medium mixed target. According to scattering properties of a mixed structure, a total electric field on the target is equal to the sum of an incident field and a scattered field, a uniform plane wave is usually used as the incident electric field, and the scattered electric field can be expressed by the aid of the electric flux density and the induced current density to be solved. A green function in a free space is expanded based on the addition theorem, and specific expression forms of aggregation factors, transfer factors and configuration factors of a far-field portion are given. According to characteristics of a body-surface integral equation and by the aid of the ray-tracing basic principle, portions with large angular spectral components in the transfer factors are reasonably selected, and portions with small angular spectral components are abandoned. Far-field effects are calculated by the aid of a fast far-field approximation method on a higher layer; a matrix equation is solved, and electromagnetic scattering parameters are calculated. The scattering problem of the metal complex inhomogeneous medium mixed target is solved by the aid of less computational memory and computational time.
Owner:NANJING UNIV OF SCI & TECH
Nuclear magnetic resonance echo data compression method and device
ActiveCN105044794AFeature Contribution GuaranteeAccurate removalElectric/magnetic detection for well-loggingDetection using electron/nuclear magnetic resonanceData compressionNMR - Nuclear magnetic resonance
The invention relates to a nuclear magnetic resonance echo data compression method and device. The compression method comprises the steps that nuclear magnetic resonance echo data to be analyzed are acquired; the main components of the nuclear magnetic resonance echo data are acquired by utilizing the nuclear magnetic resonance echo data; a compression matrix is constructed by utilizing the main components of the nuclear magnetic resonance echo data; and the nuclear magnetic resonance echo data is compressed by utilizing the compression matrix. According to the technical scheme, information with extremely low contribution to representation of stratum characteristics and even redundant information in the original echo data can be effectively eliminated so that the characteristics of the original data can still be maintained under the condition of high compression ratio, and inversion speed can be effectively enhanced and computational memory can be reduced under the condition of being without losing accuracy.
Owner:CHINA UNIV OF PETROLEUM (BEIJING)
Array antenna electromagnetic characteristic solving method based on finite element region decomposition
ActiveCN112329303AEasy to dissectOvercome the problem of high computational resource consumptionDesign optimisation/simulationSpecial data processing applicationsComputational electromagnetismGeometric modeling
The invention provides an array antenna electromagnetic characteristic solving method based on finite element region decomposition, and aims to give consideration to the calculation precision, solvingcapability and efficiency of solving the electromagnetic characteristics of a large array antenna at the same time, and the method comprises the following specific steps: (1) creating a unit geometric model; (2) setting materials and boundary conditions; (3) generating unit grids; (4) translating and copying the unit grids; (5) replacing the material and boundary attributes of the non-structuralunit; (6) solving by adopting a finite element region decomposition method; and (7) calculating electromagnetic characteristics. According to the invention, a finite element region decomposition method is applied to electromagnetic characteristic solution of the array antenna, so that the difficulty in geometric modeling and mesh generation of the large array antenna is reduced, and both the solution precision and the solution efficiency are considered.
Owner:XIDIAN UNIV
Method for controlling attitude of high-altitude aircraft by utilizing jet flow
The invention discloses a method for controlling the attitude of a high-altitude aircraft by utilizing jet flow, and relates to the field of aircraft high-altitude attitude control, the method adopts local encryption in a speed space to simulate the interference effect of jet flow and hypersonic speed rarefied incoming flow, and by adopting the method, a jet flow amplification factor can be efficiently and accurately obtained; and the flight attitude of the aircraft can be efficiently and accurately controlled.
Owner:CALCULATION AERODYNAMICS INST CHINA AERODYNAMICS RES & DEV CENT
Self-adaptive subdivision method and system for polygonal unstructured grids of integrated circuit layout
ActiveCN111767688AHigh precisionImprove efficiencyCAD circuit designSpecial data processing applicationsComputational scienceVery large scale integrated circuits
The invention relates to a self-adaptive subdivision method and system for polygonal unstructured grids of an integrated circuit layout. The method comprises the following steps: sequentially inserting eccentric midpoints into existing grids according to lost and eroded polygonal edges so as to recover the lost polygonal edges and eliminate the eroded polygonal edges; determining to-be-subdividedtriangles according to a set ratio / minimum angle threshold value; and sequentially inserting the centers of the eccentric circles of the to-be-subdivided triangles into the existing grids to eliminatethe to-be-subdivided triangles, wherein recovering of lost polygon edges, eliminating of eroded polygon edges and eliminating of to-be-subdivided triangles are performed in an interlacing manner until no lost and eroded polygon edges and to-be-subdivided triangles exist in the polygon unstructured grids of the integrated circuit layout so as to finally form a new unstructured grid of the super-large-scale integrated circuit layout, so that the problem that in the prior art, due to redundancy generated by newly-inserted nodes, local grids are too dense is solved, the grid subdivision precisionand the numerical calculation efficiency are improved, and the calculation memory is reduced.
Owner:北京智芯仿真科技有限公司
A fast compressed sensing reconstruction method for hyperspectral images based on particle swarm optimization
ActiveCN109087367AReduce computing memoryReduce computationImage codingArtificial lifeReconstruction methodReconstruction algorithm
The invention discloses a fast compression sensing reconstruction method of hyperspectral image based on particle swarm optimization, the invention relates to the technical field of image compressionprocessing, the invention discloses a fast compression sensing reconstruction method of hyperspectral image based on particle swarm optimization, which mainly solves the problem of high computationalcomplexity of the existing orthogonal matching pursuit reconstruction algorithm, the key of the technology is to use the idea of Particle Swarm Optimization, the matching process of the orthogonal matching pursuit algorithm is optimized, Using particles to represent atoms in redundant dictionaries, Based on the fast searching ability of particle swarm optimization (PSO), the optimal atom for sparse representation of hyperspectral images is found, and then the residual updating process of orthogonal matching pursuit (OMPR) reconstruction algorithm is accelerated by Hermitian inversion. The method of the invention can improve the calculation efficiency under the condition of maintaining the reconstruction accuracy.
Owner:XIAN AERONAUTICAL UNIV
Primary network-secondary network coordination type distributed power flow optimization method and related device
ActiveCN109787240AImprove the efficiency of power flow optimizationSmall amount of exchangeAc networks with different sources same frequencyCoordination typeParallel computing
The present application provides a primary network-secondary network coordination type distributed power flow optimization method and a related device. The method of the present application comprises:dividing a power distribution network system model into a primary network model and a secondary network model according to a topological relationship of the power distribution network system model; establishing a primary-secondary coordination type power flow optimization model according to a preset power flow optimization target threshold; respectively establishing a primary network ADMM iterative optimization model and a secondary network ADMM iterative optimization model by an alternating direction multiplier calculation mode according to the primary-secondary coordination type power flowoptimization model; and performing iterative operation on the primary network ADMM iterative optimization model and the secondary network ADMM iterative optimization model to obtain current primary network optimization parameters and secondary network optimization parameters. The present application is based on the primary-secondary coordination type distributed power flow optimization method of atarget synchronization type alternating direction multiplier method without the need for a unified upper optimization center, solves the calculation and communication bottleneck problems of the existing centralized optimization method in a distributed computing mode, and increases the power flow optimization efficiency of primary-secondary coordination.
Owner:GUANGDONG POWER GRID CO LTD +2
Method for obtaining electrically large target broadband RCS based on ACA and CAT
PendingCN114755652AImprove computing efficiencyShorten the timeWave based measurement systemsDesign optimisation/simulationTarget surfaceWideband radar
The invention discloses a method for acquiring broadband RCS of an electrically large target based on ACA and CAT. The method comprises the following steps: 1) subdividing the surface of the electrically large target; 2) defining an RWG primary function on the subdivided target surface; 3) grouping the RWG primary functions of the surface of the electrically large target; 4) dividing the impedance matrix into a near field block and a far field block; 5) determining a Chebyshev sampling point of the broadband; 6) respectively filling far-field blocks and near-field blocks of the impedance matrix at the sampling points; 7) filling excitation vectors of the sampling points with an incident wave electric field; 8) solving the surface induction current at each Chebyshev sampling point; 9) calculating the surface current of each frequency point in the broadband; and 10) obtaining the broadband radar scattering cross section of the electrically large-size target. On the basis of Chebyshev approximation, an adaptive crossover approximation algorithm is combined, so that the operation time is greatly shortened, and the memory demand is reduced.
Owner:XIDIAN UNIV
Transport equation response matrix block diagonalization method based on symmetric group theory
InactiveCN107092581AEasy to solveReduce computing timeComplex mathematical operationsNeutron transportSpherical harmonics
The invention discloses a transport equation response matrix block diagonalization method based on a symmetric group theory. The method comprises the steps that 1, a whole reactor core solving region is divided according to regular geometry to obtain regular blocks, a universal function is established for a neutron transport equation based on a block variation method, and a weak solution form of the transport equation is constructed; a spherical harmonic function and an orthogonal polynomial are adopted to perform discrete processing on neutron angular flux density, and the spherical harmonic function and the spatial orthogonal polynomial jointly form a primary function of flux; 2, all symmetric groups of the blocks subjected to symmetric transformation are determined according to geometrical shapes of the blocks, and projection operators of the symmetric groups are utilized to project the primary function so as to construct an irreducible symmetric primary function; and 3, the irreducible symmetric primary function is used to substitute the spherical harmonic function and the spatial orthogonal polynomial in the step 1, a new primary function is adopted to perform discrete processing on variables, and a new response matrix is a matrix of diagonal blocks. By the adoption of the method, the floating point operation amount of the matrix is greatly lowered, and a calculation memory needed for storing the response matrix is greatly reduced.
Owner:XI AN JIAOTONG UNIV
Large-scale integrated circuit layout unstructured grid eccentric midpoint generation method and system
ActiveCN112052641AGuaranteed accuracyCalculation speedComputer aided designSpecial data processing applicationsAlgorithmLayout
The invention relates to a large-scale integrated circuit layout unstructured grid eccentric midpoint generation method and system. According to the large-scale integrated circuit layout unstructuredgrid eccentric midpoint generation method and system, lost edges are recovered by an eccentric midpoint recovery method, and eroded edges are eliminated by an eccentric midpoint elimination method. Inthe recovery process of the lost edge, the elimination of the eroded edge is nested, and in the elimination process of the eroded edge, the recovery of the lost edge is nested, so that it is can be ensured that all the lost edges and the eroded edges are eliminated. Moreover, an included angle formed by eccentric midpoints generated for the lost edges and the eroded edges is just a preset triangle minimum angle threshold value for defining the quality of the triangle, so that grid nodes are reduced while the quality of the generated grid meets the requirements, and the calculation memory is reduced while the speed of numerical calculation is increased.
Owner:北京智芯仿真科技有限公司
Model reconstruction method and related device, electronic equipment and storage medium
PendingCN113706373AImplement the rebuild methodImprove time and efficiencyImage enhancementImage analysisPattern recognitionVoxel
The invention discloses a model reconstruction method, a related device, electronic equipment and a storage medium, and the method comprises the steps: fusing a depth image of a target object with a reference voxel model, and obtaining a first voxel model of the target object, wherein adjacent first voxels in the first voxel model are spaced by a first voxel distance, and at least part of the first voxels have first voxel information; and resampling the first voxel model to obtain a second voxel model, wherein adjacent second voxels in the second voxel model are spaced by a second voxel distance, the second voxel distance is greater than the first voxel distance, and at least part of the second voxels have second voxel information. According to the scheme, under the limited calculation memory, the reconstruction integrity can be ensured, and the time efficiency is improved.
Owner:SHENZHEN TETRAS AI TECH CO LTD
A voltage regulating moment-based main transformer high-voltage side bus voltage overrun processing method
ActiveCN109103888ANarrow down the selectionSimplified adjustment procedureAc networks with different sources same frequencyTransformerVoltage regulation
The invention discloses a voltage regulating moment-based main transformer high-voltage side bus voltage overrun processing method. Firstly, the invention defines the concept of regulating moment, andsynthetically analyzes the regulating moment, regulating time and regulating cost of each regulating node to form the regulating function of each regulating node corresponding to the high-voltage side bus overrun node of the main transformer. By sorting the regulating function values of each regulating node and screening from many regulating strategies, the candidate set of regulating strategy suitable for high voltage side voltage overrun of main transformer is obtained. Finally, according to the candidate strategy, the voltage of the node overrun is regulated by reactive power optimizationmodel. The invention reduces the range of the selection of the adjustment variable and simplifies the adjustment procedure by utilizing the adjustment strategy candidate set. The method of the invention has the advantages of fast execution speed and saving computational memory.
Owner:STATE GRID ZHEJIANG ELECTRIC POWER CO LTD QUZHOU POWER SUPPLY CO +2
Method for obtaining carrier platform broadband RCS based on SAIM and CAT
ActiveCN113567943AIncrease condition numberFast convergenceWave based measurement systemsCAD network environmentTelecommunicationsWideband radar
The invention discloses a method for obtaining carrier platform broadband RCS based on SAIM and CAT. The method comprises the steps: segmenting a complex carrier platform target into a plurality of sub-regions, and reserving public virtual surfaces between the adjacent sub-regions ; adopting triangles to subdivide all closed sub-regions and establishing respective Cartesian grids for each sub-region; calculating a Chebyshev sampling point of the broadband RCS, and calculating an initial surface induction current of the sub-region at the Chebyshev sampling point by using AIM; imposing boundary condition updating excitation vectors on the virtual surfaces of the adjacent sub-regions, and updating the surface induction current of the sub-regions at Chebyshev sampling points until convergence; and improving the current precision by utilizing Meili approximation, and obtaining the broadband radar cross section of the complex carrier platform. According to the method, the calculation time is greatly shortened under the condition of ensuring the precision, and the convergence speed is improved.
Owner:XIDIAN UNIV
Feature map updating method and device of mobile robot and medium
PendingCN114577215AReduce computing memoryImprove stabilityNavigational calculation instrumentsMobile robotEnvironmental geology
The embodiment of the invention discloses a feature map updating method and device for a mobile robot and a medium, and the method comprises the steps: obtaining the point cloud data of the mobile robot at the current moment, and generating a current feature point set according to a plurality of feature points in the point cloud data; performing nearest neighbor matching on a plurality of feature points in the current feature point set and feature points in a preset initialized feature map; dividing a plurality of feature points in the current feature point set into a first type of feature points and a second type of feature points according to a matching result of nearest neighbor matching, and updating positions of corresponding feature points matched with the first type of feature points in a preset initialized feature map according to pre-acquired position information of the first type of feature points, generating a first feature map; and adding each feature point in the second type of feature points to the first feature map according to pre-acquired position information of the second type of feature points, and generating an updated feature map.
Owner:山东新一代信息产业技术研究院有限公司
A Forward Modeling Method for Acoustic Seismic Data in Viscous Media
ActiveCN112327358BImprove computing efficiencyReduce computing memorySeismic signal processingWave equationViscous medium
The embodiment of this specification discloses a forward modeling method for acoustic seismic data in a viscous medium. By separating the amplitude attenuation item and the phase dispersion item, the present invention can conveniently realize the viscoacoustic reverse time migration imaging compared with the traditional forward modeling simulation of the viscoacoustic wave equation in which the attenuation item and the dispersion item are coupled together. Compared with traditional computing methods, it can greatly improve computing efficiency and reduce computing memory.
Owner:CHINA UNIV OF PETROLEUM (EAST CHINA)
A fast numerical simulation method for two-dimensional magnetotelluric field
ActiveCN114297905BImprove parallelismImprove computing efficiencyWater resource assessmentDesign optimisation/simulationFinite element methodEngineering
The invention provides a fast numerical simulation method of two-dimensional magnetotelluric field, which combines the finite element method and Fourier transform, and converts the two-dimensional partial differential problem into different wave numbers by performing Fourier transform along the horizontal direction One-dimensional ordinary differential problems that are independent of each other, with high parallelism, effectively reduce the calculation amount and improve the calculation efficiency; provide conditions for the refined numerical simulation of the magnetotelluric method under large-scale conditions; after verification, adopt the present invention The calculation result of the method is within the range of the error bars of the international public data included in the literature of Zhdanov et al.
Owner:CENT SOUTH UNIV
A method and system for extracting azimuth gathers based on offset vector slices
ActiveCN111474580BSmall range of variationReduce computing memorySeismic signal processingSubsurface scatteringTerm memory
The present invention provides a method and system for extracting azimuth gathers based on offset vector slices, comprising the following steps: dividing seismic data into several offset vector slices; calculating the ground azimuth of each offset vector slice; Perform three-dimensional Kirchhoff integral pre-stack time migration on the acquired seismic data to calculate the subsurface scattering azimuth and reflection angle; retain the subsurface scattering azimuth consistent with the ground azimuth angle; select several The x-axis, the x-axis is used to represent the angular change of the emission angle, the normal direction of the plane is the z-axis, and the z-axis is used to represent the change of the formation depth, and the obtained reflection angle is marked in the x-z coordinate system to obtain the reflection angle distribution map ; Obtain the azimuth angle gather according to the reflection angle distribution map. It effectively reduces the variation range of the scattering angle γ and the scattering azimuth angle, can greatly save memory and hard disk resources, and shorten the calculation cycle.
Owner:CHINA NAT OFFSHORE OIL CORP +1
Method and system for self-adaptive subdivision of polygonal unstructured grid for integrated circuit layout
ActiveCN111767688BHigh precisionImprove efficiencyCAD circuit designSpecial data processing applicationsComputational scienceAlgorithm
The invention relates to a method and system for self-adaptive subdivision of a polygonal unstructured grid of an integrated circuit layout. The method includes sequentially inserting eccentric points into the existing mesh according to the lost and eroded polygon edges to recover the lost and eliminated eroded polygon edges, determining the triangles to be subdivided according to the set ratio / minimum angle threshold, in order Insert the center of the eccentric circle of the triangle to be subdivided into the existing mesh to eliminate the triangle to be subdivided. The above restores the lost and eliminated the eroded polygon edges and eliminates the triangle to be subdivided. Interleaved until the integrated circuit layout polygonal unstructured network There are no missing and eroded polygon edges and triangles to be subdivided in the grid, and finally form a new unstructured grid of VLSI layout to solve the redundancy caused by newly inserted nodes in the prior art While solving the problem of excessively dense local grids, it improves grid division accuracy and numerical calculation efficiency, and reduces calculation memory.
Owner:北京智芯仿真科技有限公司
Inspection method and system for aircraft skin damage
PendingCN114255408AImprove detection efficiencyImprove detection accuracyWeb data indexingCharacter and pattern recognitionEyewearSkin damage
The invention discloses an aircraft skin damage inspection method and system, and relates to the field of aircraft skin damage detection. The method comprises the following steps: carrying out patrol inspection on the upper surface damage of the aircraft skin by deploying AR glasses of a damage identification model, and identifying the damage type according to the patrol inspection result, the scheme detects the aircraft skin damage by deploying the AR glasses of the damage identification model, identifies the damage type, and improves the skin damage detection efficiency and accuracy. In the inspection process of the aircraft ground inspection personnel, the damage on the aircraft skin can be found in real time and the damage category can be identified by deploying the AR glasses of the damage identification model, and the inspection personnel can be reminded.
Owner:BEIJING ZHIZHEN ZHIZAO TECH CO LTD
Fast numerical simulation method for two-dimensional magnetotelluric field
ActiveCN114297905AImprove parallelismImprove computing efficiencyWater resource assessmentDesign optimisation/simulationFinite element methodEngineering
The invention provides a fast numerical simulation method for a two-dimensional magnetotelluric field, which combines a finite element method with Fourier transform, transforms a two-dimensional partial differential problem into a mutually independent one-dimensional ordinary differential problem among different wave numbers by performing Fourier transform along the horizontal direction, is high in parallelism degree, effectively reduces the calculation amount, and improves the calculation efficiency. The calculation efficiency is improved; conditions are provided for refined numerical simulation of the magnetotelluric method under a large-scale condition; through verification, a result calculated by adopting the method disclosed by the invention is within an error rod range of international public data recorded in the Zhdanov et al.1997 literature, is close to a mean value, and meets a precision requirement.
Owner:CENT SOUTH UNIV
A three-dimensional quasi-transport acceleration method for the uniform geometry variational nodal method
ActiveCN113673116BReduce in quantityImprove computing efficiencyDesign optimisation/simulationCAD numerical modellingPressurized water reactorNeutron transport
A three-dimensional quasi-transport acceleration method for the uniform geometric variational nodal method, which eliminates the axial and radial cross-derivative terms in the second-order even-parity neutron transport equation through quasi-transport approximation; considering the In the actual pressurized water reactor, the axial inhomogeneity is relatively weak, and the present invention adopts diffusion approximation to the angular distribution of the odd neutron angular flux density on the axial surface in the Ritz discrete process; , taking advantage of the symmetry of the angular space, reduces the number of angular basis functions for the odd neutron angular flux density on the radial surface. The invention can greatly improve the calculation efficiency and reduce the calculation memory without significantly affecting the calculation accuracy, so as to be used for accurate and efficient neutronics simulation in nuclear reactor design.
Owner:SHANGHAI JIAOTONG UNIV
Azimuth gather extraction method and system based on geophone offset vector sheets
ActiveCN111474580ASmall range of variationReduce computing memorySeismic signal processingGeophoneEarth quake
The invention provides an azimuth gather extraction method and system based on geophone offset vector sheets. The method comprises the following steps: dividing seismic data into a plurality of geophone offset vector sheets; calculating a ground azimuth angle of each geophone offset vector sheet; performing three-dimensional Kirchhoff integral pre-stack time migration on the acquired seismic data,and calculating an underground scattering azimuth angle and a reflection angle; reserving an underground scattering azimuth angle consistent with the ground azimuth angle; selecting a plurality of xaxes in a plane according to the reserved underground scattering azimuth angles, wherien the x axes are used for representing angle changes of emission angles, the normal direction of the plane is a zaxis, the z axis is used for representing stratum depth changes, and the obtained reflection angles are marked in an x-z coordinate system to obtain a reflection angle distribution map; and obtainingan azimuth gather according to the reflection angle distribution map. The change range of the scattering field angle gamma and the scattering azimuth angle is effectively reduced, memory and hard disk resources can be greatly saved, and the calculation period is shortened.
Owner:CHINA NAT OFFSHORE OIL CORP +1
A method for coordinating distributed power flow optimization of main distribution network and related equipment
ActiveCN109787240BImprove the efficiency of power flow optimizationSmall amount of exchangeAc networks with different sources same frequencyNetwork modelDistributed computing
Owner:GUANGDONG POWER GRID CO LTD +2
Seismic forward modeling method based on least square conjugate gradient iteration of frequency domain
PendingCN113671574AForward fast and efficientIteration conditions are looseSeismic signal processingWave equationComputational physics
The invention discloses a seismic forward modeling method based on least square conjugate gradient iteration of a frequency domain. The method comprises the following steps: inputting a time-harmonic wave equation after Fourier transform to the frequency domain; setting corresponding forward modeling simulation parameters; and performing iterative solution on the time-harmonic wave equation through a least square conjugate gradient algorithm according to the forward modeling simulation parameters. Compared with a forward modeling method based on LU direct solution, the method provided by the invention can reduce memory consumption and improve calculation efficiency under the condition of keeping the same precision, and compared with a forward modeling method based on BI-CGSTAB iterative solution, the method provided by the invention can obtain more loose use conditions and better calculation stability under the condition of approximate calculation efficiency.
Owner:SOUTHWEST PETROLEUM UNIV
A Multi-Measure Semi-global Dense Matching Method
ActiveCN110060283BReduce computing memoryImprove matching efficiencyImage enhancementImage analysisParallaxData set
The invention discloses a multi-measure semi-global dense matching algorithm. Firstly, matching cost is calculated on the top layer of a pyramid by utilizing a Cenus similarity measure. A disparity map is generated and optimized. Then a disparity map result is transmitted downwards step by step according to a pyramid strategy to serve as disparity map initial values calculated by the mutual information matching cost of the next-level pyramid, and finally a dense matching result of sub-pixel-level precision is obtained. According to the method, for defects of a classic semi-global matching algorithm in the aspects of efficiency, robustness and the like, improvement and expansion are carried out in the aspects of penalty coefficient, similarity measure selection, parallax range adjustment and the like. The method has the characteristics of robustness, reliability, high efficiency, fine matching parallax image and edge protection. Meanwhile, robustness of matching is improved by conducting radiation processing on the image data set, the calculation memory in the matching process is reduced through dynamic adjustment of the self-adaptive disparity range, and the matching efficiency isimproved.
Owner:WUHAN UNIV
Numerical design method of adiabatic mode coupler
The invention discloses a numerical design method of an adiabatic mode coupler, which comprises the following steps of: performing non-uniform segmentation on the adiabatic mode coupler along a light beam mode propagation direction, performing fine segmentation on a region sensitive to mode change, and for a region far away from a fine structure, as the mode change is gentle, the mode change is more stable, and the mode change is more stable. According to the method and the system, excessive fine segmentation does not need to be adopted, so that the purpose of carefully describing a local fine structure is achieved, the calculation amount is kept in a proper range, the calculation memory is saved, and the simulation design speed is increased. Moreover, the same loss constraint value is selected for each segment, and the adiabatic mode coupler which is small in size, easy to process, large in bandwidth and simple in structure is realized in a numerical mode.
Owner:NANTONG UNIVERSITY
Self-adaptive two-dimensional finite element sparse and dense grid interface transition method
InactiveCN105574281ASmall footprintReduce computing memoryDesign optimisation/simulationSpecial data processing applicationsFinite element algorithmElement model
The invention discloses a self-adaptive two-dimensional finite element sparse and dense grid interface transition method which is applied to the field of engineering structure analysis. The method comprises the following steps: forcing displacement of finite element nodes in different sparse and dense grid sub-regions to be continuous through penalty factors in a least square manner, so as to obtain an interface transition element and system rigidity matrix according to the principle of minimum potential energy; introducing the rigidity matrix into commercial finite element software through a user unit subprogram interface; selecting the proper penalty factor only by setting the material attribute, the geometrical feature, the load and other properties of the unit by the user so as to realize the two-dimensional finite element grid interface transition. The method can effectively solve the local refinement problem when the finite element grids are divided and the remote docking problem of finite element models established in different regions, by different analysts and by adopting different types of finite element software, has self-adaptability, and is simple and practicable, high in computational accuracy, small in occupied internal storage and high in computation speed.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Method and system for generating eccentric center point of large scale integrated circuit layout unstructured grid
ActiveCN112052641BGuaranteed accuracyCalculation speedComputer aided designSpecial data processing applicationsAlgorithmLayout
The invention relates to a large-scale integrated circuit layout unstructured grid eccentric midpoint generation method and system. According to the large-scale integrated circuit layout unstructuredgrid eccentric midpoint generation method and system, lost edges are recovered by an eccentric midpoint recovery method, and eroded edges are eliminated by an eccentric midpoint elimination method. Inthe recovery process of the lost edge, the elimination of the eroded edge is nested, and in the elimination process of the eroded edge, the recovery of the lost edge is nested, so that it is can be ensured that all the lost edges and the eroded edges are eliminated. Moreover, an included angle formed by eccentric midpoints generated for the lost edges and the eroded edges is just a preset triangle minimum angle threshold value for defining the quality of the triangle, so that grid nodes are reduced while the quality of the generated grid meets the requirements, and the calculation memory is reduced while the speed of numerical calculation is increased.
Owner:北京智芯仿真科技有限公司
A method for attitude control of high-altitude aircraft by using jet flow
The invention discloses a method for controlling the attitude of high-altitude aircraft by using jet flow, which relates to the field of high-altitude attitude control of aircraft. The method adopts local encryption in velocity space to simulate the interference effect of jet flow and hypersonic thin incoming flow. The method can The jet amplification factor can be obtained efficiently and accurately, and then the flight attitude of the aircraft can be controlled efficiently and accurately.
Owner:CALCULATION AERODYNAMICS INST CHINA AERODYNAMICS RES & DEV CENT
A method and device for compressing nuclear magnetic resonance echo data
ActiveCN105044794BFeature Contribution GuaranteeAccurate removalElectric/magnetic detection for well-loggingDetection using electron/nuclear magnetic resonanceNMR - Nuclear magnetic resonanceOriginal data
The invention relates to a method and device for compressing nuclear magnetic resonance echo data, wherein the compression method comprises: acquiring nuclear magnetic resonance echo data to be analyzed; using the nuclear magnetic resonance echo data to obtain principal components of the nuclear magnetic resonance echo data; A compression matrix is constructed by using the principal components of the nuclear magnetic resonance echo data; and the nuclear magnetic resonance echo data is compressed by using the compression matrix. This technical solution can effectively eliminate the information that has little contribution to the characterization of formation characteristics or even redundant information in the original echo data, can still ensure the characteristics of the original data under the condition of high compression ratio, and can effectively prevent the loss of accuracy. Improve inversion speed and reduce computational memory.
Owner:CHINA UNIV OF PETROLEUM (BEIJING)
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