213 results about "Grid file" patented technology

The invention discloses a method for simulating the blade flutter boundary of an aviation turbine engine, which is based on the principle of energy law and adopts a weak coupling method to design a flutter forecasting method, thus obtaining the blade flutter boundary of the engine by pneumatic damping value. The method comprises: first, a solid model of a blade is set up; then, modal analysis is carried out on the blade; after that, a flow field model of the blade is set up; the vibration displacement of the linear interpolation blade can be obtained, grid files needed by flow field analysis are generated by adopting multilayer dynamic mesh processing, a dynamic mesh module is invoked to obtain the parameters in the flow field, pneumatic damping is acquired under every working condition, and finally, the flutter boundary can be obtained. Based on the one-way weak coupling, the method greatly simplifies the calculation, saves the calculation cost, and can realize the pneumatic damping calculation under any frequency and different flow field states, thus having good engineering applicability.

The invention provides a multi-dimensional interval query method based on cloud computing. The method includes the steps of index construction and multi-dimensional interval data query. The index construction step includes: automatically constructing and storing a distributed grid file index and metadata according to an externally entered index construction command. The multi-dimensional interval data query step includes: positioning a data block to be read, according to an externally entered query command and on the basis of the distributed grid file index and metadata, and automatically and evenly distributing reading requests to nods of a server cluster, parallelly processing query requests in the system, parallelly acquiring all query results, and collecting the results before returning to users. The invention further provides a multi-dimensional interval query system based on the distributed grid file index.

The invention relates to an aeroelastic stability fluid-structure interaction prediction method of turbo-machine changed interblade phase angles, which predicts the aeroelastic stability of a turbo-machine through the modal pneumatic damping ratio of different interblade phase angles by adopting an energy method. The method adopts the modal analysis containing prestress on established single-sector finite element models, realizes the vibration displacement transfer on the fluid-structure interaction interface through a data transfer method, adopts the dynamic mesh technology for obtaining mesh files taking the interblade phase angles into consideration, is used for unsteady computation fluid mechanic analysis of Junction Box modules in CFX, further obtains the modal pneumatic damping ratio of each interblade phase angle, and is used for predicting the aeroelastic stability. The method based on the fluid-structure interaction fully utilizes the cutting edge technology of the computational structural mechanics and the computation fluid mechanics, ensures the computation precision in each sub system, and improves the computation efficiency through the division of a fixed region and a movable region. The invention has good practical value and wide application prospects in the technical field of turbo-machine simulation.

A method and an apparatus for authenticating location-based services without compromising location privacy, which comprises a comprehensive solution that preserves unconditional location privacy when authenticating either range queries using three authentication schemes for R-tree and grid-file index, together with two optimization techniques, or k-nearest neighbor queries using two authentication schemes for R-tree and Voronoi Diagram index.

The invention discloses a high-fidelity digital modeling method of terrain elevation, the steps are as follows: the first step is to carry out push-broom data acquisition; the second step is to carry out grid segmentation of the acquired vector terrain feature data; the third step is to carry out similar DEM grid data organization of PLA, organization management is carried out to the PLA data after the grid segmentation treatment according to grid data structure; the fourth step is to generate a new digital elevation model file to carry out the seamless embedding of the vector feature data; a feature embedded digital elevation model data structure is composed of three sub-files which comprise a grid file, a feature identification file and a feature file; the grid file is a regular grid data structure; the feature identification file is used for spatial data index of a vector grid integrated organization, the structure thereof is consistent with the current national DEM data structure and only records the grids with the features; the feature file records terrain feature information which is contained in one grid unit, and the information comprises feature points and feature lines.

The invention discloses an optimization design method for an air conditioner airduct structure, comprising the following steps of: (1) establishing at least two airduct models; (2) respectively carrying out grid partition on the spanned files of the airduct models, and importing generated grid files into CFD (Computational Fluid Dynamics) software; (3) setting model parameters and variable parameters in the CFD software; (4) working out noise and air quantity after the CFD software simulate air flow reaches the quasi-stable state; (5) comparing to obtain models with big air quantity and small noise in the airduct models, taking the models as the preselected scheme, then carrying out the airduct model modification on the preselected scheme for at least one time, and returning to the step (2) to determine a final airduct model; and (6) producing an air conditioner model machine by combining with the final airduct model, and conducting a noise experiment and an air quantity experiment. By using the optimization design method for the air conditioner airduct structure, the design cost of the air conditioner airduct structure can be reduced, the parameter test time is shortened and the use becomes convenient.

The present invention relates to a three-dimensional model progression transmission method on basis of keeping character, the present invention holds the improvement for character keeping on the basis of the simplified arithmetic of the original three-dimensional model, and at the same time of simplifying the geometrical model, the present invention keeps the topological property and attribute character of the model, and gets the underlying net with smaller data amount, and on the basis of above, the processing coding is held distributed on basis of octree to construct the procession net document. When in transmission, the octree broadness prior coding underlying net is firstly used, and then adopting the procession net transmission method to transport a serial detail recovering information, and continuousely improving model presicion and recovering the original document, thereby solving the problem that: the responding time for the traditional transmission method is long. In adition, the viewpoint related transmission strategy facing the object is designed for the three-dimensional scene, increasing the actural drawing, and making the visibility judging of the object is carried out by putting on the clinet end, and reducing the loading of the server.

The invention discloses a method for calculating the installation positions of indoor machines of air conditioners, comprising the following steps of: 1 establishing working zone models of the indoor machines of the air conditioners; 2 respectively carrying out gridding division to the spanned files of various working zone models and guiding the generated grid files into CFD (Computational Fluid Dynamics) software; 3 setting model parameters and variable parameters required for operation; 4 arbitrarily setting at least one section for various working zone models and selecting calculating points to calculate the temperature values and the air speed values of the calculating points; and 5 calculating the temperature uneven factor and the speed uneven factor of each section. The method for calculating the installation positions of the indoor machines of the air conditioners can be used for conveniently calculating the performance parameters of the air conditioners in different installation positions to guide installers to rapidly determine the optimum installation positions of the air conditioners, and is simple for operation.

The invention discloses a method for predicting the performance of a hydraulic torque converter through simulation and aims to solve the problems of low accuracy, numerous grids and large calculated amount for predicating the performance of the hydraulic torque converter. The method for predicting the performance of the hydraulic torque converter through simulation comprises the following steps: 1, extracting calculation models, namely extracting a circulating circle of the hydraulic torque converter, extracting a full passage model of thehydraulic torque converter and extracting a single passage model of the hydraulic torque converter; 2, generating full passage hexahedral mesh models of the hydraulic torque converter, namely generating a guide wheel full passage hexahedral mesh model and a pump wheel and turbine full passage hexahedral mesh model, assembling a mesh, namely sequentially importing the generated pump wheel and turbine full passage hexahedral mesh model and guide wheel full passage hexahedral mesh model into a computational fluid dynamics pre-processing software for assembly, and setting boundary conditions; 3, performing numerical calculation by using Fluent, namely performing numerical solution by importing the assembled hydraulic torque converter full passage mesh file into commercialcomputational fluid dynamics software Fluent; and 4, comparing the simulation with experimental data.

The invention provides a three-dimensional topological information extraction method based on Reeb graph description. The method comprises the steps of reading vertex and triangular facet information of an input grid file of a three-dimensional model, then respectively establishing point sequences and storing a corresponding triangular facet relationship; after the point sequences are obtained, marking a reference point according to certain rules, further establishing a virtual ground and calculating the geodesic distance of the vertex; establishing a Morse function according to the geodesic distance; and on the basis of the established Morse function, using a simplified triangle method to extract and obtain an initial Reeb graph and finally filtering redundant information in the initial Reeb graph to obtain a final Reeb graph to complete the extraction of the topological information of the three-dimensional model. The accompanying drawing in the abstract is a principle block diagram for the method. The method based on the topological description of the three-dimensional model has higher common applicability and the extraction result obtained by using the method is suitable for further application such as behavior analysis.

The invention discloses a simulation method for the wind pressure coefficient of a reflection plane antenna panel, and the method comprises the steps: firstly building an antenna panel geometric model through ProE software; secondly importing the geometric model into preposed dividing grid software ICEM-CFD, building and computing a flow field region range, and carrying out the grid dividing of the flow field region; thirdly enabling a grid file to be imported into flow field solving software FLUENT, carrying out the computing and solving through a series of settings, and obtaining the wind pressure distribution of the antenna panel; finally exporting the computing and solving result of the FLUENT, and compiling a MATLAB program to solve the blocked mean wind pressure coefficient value. The method solves a problem that a conventional reflection plane antenna is short of related tunnel test data, and determines the blocked wind pressure coefficient values of the antenna panel under various conditions through a software simulation method. The method can provide the visual flow field information, is low in cost, can carry out the repeated operation, facilitates the control of the change of simulation environment conditions, and is complete in result collection.

The invention aims to provide a river water quality prediction method. The method includes the steps that a specific boundary of a to-be-predicted river is depicted; a .kml format file of the predicted river boundary is converted into a point; the WGS 1984 coordinates of the point are converted into coordinates with meter as the unit; the converted to-be-predicted river boundary point position coordinates are stored; grid division is carried out on the predicted river by using CVLGrid1.0 software, and the divided predicted river grid is exported; a grid file of the to-be-predicted river is imported into an EFDC-Explorer; on the basis of establishing a hydrodynamic model, a water quality model of the predicted river is established; real-time monitored flow and water quality data of the flow boundary of the predicted river are imported into the water quality model, the water quality distribution situation of the to-be-predicted river is simulated within a period of time, and water quality prediction of the to-be-predicted river is achieved. The method is unique, easy to operate and apply, accurate in prediction effect and beneficial to ecological environment protection of rivers, and has remarkable economic and social benefits.

The invention provides a three-dimensional numerical simulation method for ship large-scale rolling motion, which comprises the following steps of reading a grid file to carry out ship hydrostatic calculation; calculating an influence coefficient matrix of boundary integral equation for Taylor expansion boundary element method; solving velocity potential of laminated modes and its spatial first and second derivatives and mj terms; carrying out the green's function in time domain and its spatial derivative solution; calculating a roll damping coefficient; carrying out the irregular wave decomposition, linear superposition into incident wave time calendar; carrying out the direct time-domain disturbance wave force calculation by taylor expansion boundary element method; calculating incidentwave force and hydrostatic recovery force; modeling a large-scale motion forecasting equation; using the fourth-order runge-kutta method to solve the motion equation step by step to evaluate the nonlinear motion of the ship in the top wave or oblique wave; and carrying out the numerical simulation and characteristic statistics of ship large amplitude motion in irregular waves. The method of the invention can predict the large amplitude motion of a container ship in regular waves and irregular waves, and can be used for numerical simulation and characteristic statistics of the large amplitude motion of a ship in irregular waves.

The invention relates to geophysical exploration key-drawing technique, especially a method for drawing a complex normal fault isoline structure diagram able to realize rectangular-grid automatic tracking, gridding discrete data to obtain grid file, searching an equivalent point on the four sides of the grid as well as the inner sides according to the user-set isoline starting value, then calculating the coordinates of the next equivalent point on the other three sides of the current grid unit, and according to that either line or column numbers of the two successive units that the isoline passes through are equal, setting a tracking program to automatically continue tracking until the whole isoline is completed. And as compared with the program of encrypting while tracking, it is simple and quick.

The invention discloses a mining area automatic semantic segmentation method in remote sensing image in the technical field of automatic target detection and depth learning, characterized in that: thespecific steps are as follows: 1, establishing a training sample set: acquisition of Remote Sensing Images of Mining Areas, and artificial delineating the boundaries of the mining area, forming a Boundary Grid File, 448*448 being generated by ArcGIS, 512*512 fishing nets of two scales, the remote sensing image of the mining area being cut in batches by using the two generated fishing nets to generate image blocks of different sizes as input data of the depth learning network, and the boundary files of the mining area grid in the image being cut through the fishing nets to generate boundary files corresponding to each mining area image block as label data of the network. The invention adopts a hybrid network Den-Res Net can abstract the extracted features while preserving the integrity offeatures, which can be used to solve the redundancy problem of Dense Net network, and the method has high efficiency, automatic semantic segregation and high accuracy.

The invention discloses a double-volute hydraulic design method based on an RSM model. The design method comprises the steps of 1) solving double-volute initial hydraulic geometric parameters based on a velocity coefficient method; 2) performing optimization solving on double-volute key geometric parameters by adopting an RSM-based adaptive sequence algorithm; 3) performing parameterization automatic modeling based on a CATIA macroprogram, and outputting to obtain a three-dimensional double-volute model; 4) by adopting a GridPro script file to output a grid file used for numerical value calculation; 5) automatically completing grid loading and boundary condition setting based on a CFX CCL language drive program to complete calculation of related data, and outputting a calculation result; 6) repeatedly executing the steps 3) to 5) to obtain a double-volute scheme with the minimum total pressure loss coefficient; and 7) taking the data obtained in the steps 1) to 6) as the double-volute design parameters to manufacture a double-volute centrifugal pump. By adoption of the double-volute hydraulic design method, the double-volute hydraulic optimization design can be realized.

The present invention provides a stirred tank reactor simulation method based on an immersed boundary method. The method includes: a preparation phase including determination and setting of calculating parameters, generation of fluid grid files, generation of Lagrange mark point information, and preparation of calculating resources; numerical calculation: setting boundary conditions of computational domains and solving velocity fields and temperature fields based on fluid grids; combining with a discrete element method to achieve an interface analytic simulation of two-phase flow of particle flow, wherein the immersed boundary method is directly employed to apply non-slip boundary conditions to particle surfaces; a post-processing phase, and outputting information of each Euler mesh and information of each particle after a simulation is completed. According to the characteristics of different boundaries, in the calculation, the mixed immersed boundary method is employed to process, and the mass numerical simulation of turbulent flow in the stirred tank reactor is achieved through combination of large eddy simulation and high performance parallel computing technology. The simulation method may be applied to simulation of turbulent flow and simulation of solid particle suspension in the stirred tank reactor and the like.

The invention discloses a grid parallel preprocessing method based on MPI. The grid parallel preprocessing method based on the MPI comprises the following steps: giving a partition number of grids in a computation area; starting MPI multiprocessing, setting a process number; judging whether the process number is equal to the partition number; opening grid files if the process number is equal to the partition number, reading grid cell information files by a main process, initially and averagely assigning the grid cells to each process, creating an adjacent array of each process; otherwise, restarting the MPI multiprocessing; invoking ParMETIS by each process to divide the grids; reading the grid cell information by blocks into the array through each process, setting an index position of the array; looping through the grid cell information files by each process, judging whether the difference of subtracting the index position number of the array from the array length is less than the length of the grid cell information; if the answer is yes, reading data of the grid cell information files and filling the array with the data; otherwise, assigning array elements to the grid cells; judging whether the partition number of the grid cell is equal to the process number; if the answer is yes, storing the grid cell information into a process file; otherwise, keeping judging circularly.

The invention discloses a method for determining the laying form of a pulsed fiber sand fracturing propping agent group. The method comprises the following steps of 1) determining geometric structureparameters of a hydraulic fracture; 2) measuring the rheological parameters of the fracturing fluid and the fiber fracturing fluid, and correcting to obtain the rheological parameters of the fracturing fluid, the fiber and the proppant mixed liquid; 3) establishing a hydraulic fracture geometric model, outputting a data file in the iges format, performing flow field calculation domain grid division, and outputting a grid file in the msh format; 4) treating the fracturing fluid and the fracturing fluid + fiber + proppant mixed liquid which are alternately injected by the pulses as two continuous fluid phases respectively, and establishing a CFD model of the two phases flowing in the crack; And 5) simulating the flow of the fracturing fluid and the mixed liquid pulse injected into the hydraulic fracture to obtain the pavement form of the propping agent group. The method can quantitatively describe the pavement form of the propping agent group in the fracture, and provides technical support and theoretical basis for researching the yield increasing mechanism of pulse fiber sand fracturing and optimizing construction parameters.

The invention relates to a map data query method and device, a computer readable storage medium and computer equipment. The method comprises the steps of obtaining a to-be-queried geographic position;determining a to-be-queried map grid code corresponding to the to-be-queried geographic position according to the first map grid where the to-be-queried geographic position is located; querying a target map grid file in at least two map grid files pre-segmented from a map according to the to-be-queried map grid code, wherein map data in the target map grid file corresponds to the same second mapgrid, the second map grid is a map grid obtained by pre-segmenting in a map according to the target map grid file, the map grid code of the second map grid is matched with the to-be-queried map grid code; and loading the target map grid file to obtain target map data in the loaded target map grid file. By adopting the method, the map data query efficiency can be improved.

The invention discloses a hard disk data protection and recovery method of a Linux platform. The method implements protection and recovery for the data in a file system through a write operation redirection technology based on a hybrid file system, a protection technology based on a read-only compressed file system, an Initrd-based configuration technology for initializing a sub-system when a kernel moves later, a file system quick detection and repair technology and a root file system detection technology based on a file system identifier; and the method transparently protects the file system data of an operating system without using own file system access control of the operating system, records file modifications of the running process and recoveries the data as needed.

A method and an apparatus for authenticating location-based services without compromising location privacy, which comprises a comprehensive solution that preserves unconditional location privacy when authenticating either range queries using three authentication schemes for R-tree and grid-file index, together with two optimization techniques, or k-nearest neighbor queries using two authentication schemes for R-tree and Voronoi Diagram index.

The invention relates to a system for the transmission of mass high-energy physical experimental data. The system comprises a multipath source data scanning module, a data buffer area module, an efficient polling module, a transmitting optimization module, a transmitting module, a data buffer area automatic release module, efficient receiving modules, data validation modules, receiving optimization modules, storage modules, a user management configuration module and a monitoring module, wherein the multipath source data scanning module, the data buffer area module, the efficient polling module, the transmitting optimization module, the transmitting module and the data buffer area automatic release module are located in a source-end efficient transmitting module, and the efficient receiving modules, the data validation modules, the receiving optimization modules and the storage modules are located at the destination end. The invention also relates to a method for the transmission of the mass high-energy physical experimental data, and the method comprises three steps. According to the system and the method, the multipath parallel transmission of the high-energy physical experimental data is realized based on a GridFTP (Grid File Transfer Protocol), and the function of each module of the system can be configured through a user management configuration interface, so that the graphic monitoring of stages during the process of system operation and no mutual interference during the process of multipath transmission are realized, and the problems of single transmission destinations, single configurable items, system instability, difficulty in extension and the like of the existing data transmission system are sovled.

The invention provides an automatic simulation analysis method and device based on STAR-CCM +. The method comprises the following steps: starting the STAR-CCM + according to a preset automatic script;reading the grid file to build a simulation analysis model; reading the parameter file to perform parameter setting on the simulation model; performing simulation operation analysis according to thesimulation analysis model after parameter setting is completed; and carrying out post-processing on the operation result to generate a result file. According to the invention, the automation of simulation analysis can be realized, the working efficiency is improved, the cost is reduced, and the accuracy of a simulation result is improved.

The invention discloses a method for analyzing swing high-speed jet characteristics of an underwater engine nozzle, and belongs to the field of fluid mechanical engineering. The implementation methodcomprises the following steps of: through establishing a geometric model of an underwater solid rocket engine nozzle, establishing a fluid calculation domain, carrying out geometric optimization on aninterface of the two fluid calculation domains, setting an interface between the calculation domains for data transmission to achieve simulation of the swing working condition of the nozzle, carryingout grid division on the fluid domains in a partitioned mode, carrying out grid independence verification, and obtaining the optimal grid number; importing the obtained final grid file into a FLUENTsolver, setting boundary conditions, an adopted calculation model and a calculation method, and carrying out solving; carrying out numerical simulation analysis and post-processing on a numerical calculation result. The rocket engine nozzle swing high-speed jet flow characteristic is accurately simulated and analyzed, the nozzle swing high-speed jet flow rule and mechanism can be easily disclosed,a theoretical basis is provided for the engine nozzle structure design of underwater powered missile launching, and the actual engineering application problem of underwater powered missile launchingis solved.

The invention discloses a pantograph unsteady characteristic analysis method based on sliding plate spacing. The pantograph unsteady characteristic analysis method comprises the following steps: step1, constructing a high-speed pantograph aerodynamic model; step 2, constructing a high-speed pantograph three-dimensional entity calculation model according to the model constructed in the step 1; Selecting a calculation area and carrying out grid division; Step 3, setting a sliding plate spacing calculation working condition, and importing the grid file divided in the step 2 into Fluent for simulation calculation; 4, obtaining a velocity contour map of the bow head center cross section and the bow head support cross section and a resistance time history curve and a lift force time history curve of a front sliding plate and a rear sliding plate of the pantograph under different sliding plate intervals according to the solving results in the step 3, and completing analysis of the unsteady characteristics of the pantograph; According to the method, time domain and frequency domain analysis is carried out on aerodynamic forces with different slide plate distances, a basis is provided forpantograph slide plate distance selection, the pantograph operation aerodynamic characteristic condition is improved, and disturbance of high-speed airflow to pantograph net current collection is reduced.

The invention relates to a data transmission technique between services in facing-service system, wherein it adds one data transmission optimize adaptor in the providing server; for the data transmission request with data and target service addresses that transmitted form local server, evaluating the conditions as data transmission amount, sending test pack to the providing server with target service or the data server of protocol network, to test; then obtaining bandwidth and delay information to select relative transmission protocol. The invention can transmit object access protocol, document transmit protocol, and mesh document transmission protocol on special platform, to improve flexibility.

The invention provides a ship motion prediction method based on a Taylor expansion boundary element method. The method comprises the steps of reading the grid file and carrying out hydrostatic calculation; calculating the influence coefficient matrix of a boundary integral equation needed by the taylor expansion boundary element method; solving the velocity potential of laminated modes and its spatial first and second derivatives and Mj terms; solving the green's function in time domain and its spatial derivative; solving the instantaneous terms of radiation velocity potential and their spatial first and second derivatives; solving the radiation velocity potential memory term and its spatial first and second derivatives; solving the impulse response function of added mass, wave-making damping and radiation wave force; solving the impulse response function of whole wave incident velocity potential; diffraction velocity potential and its first and second derivatives in space, solving theimpulse response function of diffraction wave force; solving the ship motion in full wave direction; analyzing and calculating the ship motion spectrum under different sea conditions. The invention can predict the hydrodynamic coefficients of three main ship types, wave loads, six-degree-of-freedom motion of the ship in full wave direction, and ship motion spectrum analysis under various sea conditions.

The invention relates to an image processing method and a system for seamless alignment of a projection screen. The image processing method comprises the following steps of: S1, loading a grid image pre-stored by a user through an image distributor; S2, respectively regulating control points on adjacent grid curves in the grid image and control points on a curve surface to realize edge seamless alignment of adjacent grids of the projection screen on a D3D (Direct 3D) surface according to the Bezier law; S3, storing the regulated grid image in a grid file; and S4, displaying the grid image which is regulated on the D3D surface in real time by an image demonstrator. By implementing the technical scheme in the invention, the control points on the adjacent grid curves in the grid image and the control points on the curve surface are respectively regulated according to the Bezier law, thus seamless alignment of the projection screen is realized to ensure that an image is smooth and neat, and is processed by using various special effects of D2D.

The invention provides a radial oil film bearing dynamic mesh updating method based on Fluent. The method comprises the following steps that (1), a bearing oil film mesh file is established; (2), a UDF control macroprogram in Fluent software is compiled; (4) a data file obtained in the third step is treated with an Excel tool; (5) fluid calculation software Fluent is started, the mesh file is imported, a UDF program is mounted, and UDF control conditions are set; (6), flow field calculation is controlled through a UDF dynamic mesh program; and (7) whether a bearing neck center track is convergent or not is judged. According to the radial oil film bearing dynamic mesh updating method based on the Fluent, the problem that due to the fact that the length-width ratio of bearing oil film meshes is too large, mesh distortion is prone to occur in the dynamic mesh moving process is solved, and equal-interval distribution, in the circumferential direction, of mesh lines in the radial direction before and after the moving process is guaranteed. When the method is used for calculating node coordinates of dynamic meshes, the mesh lines are always perpendicular to the bearing neck surface, the meshes are not prone to distortion, accumulated errors of mesh calculation are avoided, and the bearing performance calculating speed is increased.