50 results about "Quadrilateral grid" patented technology

The invention discloses a curved surface quadrilateral dominant grid generation method, device and equipment for an aircraft and a storage medium, and relates to the technical field of computational fluid mechanics, and the method comprises the steps: creating a surface unstructured grid based on surface grid generation parameters of a CAD file of the aircraft, carrying out the conformal mapping of the surface unstructured grid to a parameter domain plane, and calculating the vertex compression ratio of each grid vertex; selecting the current starting point with the minimum compression ratio and the maximum to-be-compared vertex in the adjacency list, and determining the current to-be-processed vertex with the minimum compression ratio in the adjacent vertexes and the advancing direction; determining to-be-processed discrete points according to the current compression ratio and the coordinate information to generate a current isoline, if the current compression ratio does not exceed a threshold value, iteratively updating the current starting point, and skipping to the step of determining the current to-be-processed vertex again; the discrete points are projected to the outer-layer isolines according to the isoline sequence, and the curved-surface quadrilateral dominant grid is generated based on the distance proportion between each discrete point and the projection point, so that the generation efficiency of the curved-surface quadrilateral grid is improved.

The invention discloses a polygonal and quadrilateral mesh automatic subdivision method based on deep reinforcement learning, relates to the field of computational geometry and mesh generation, and constructs an automatic subdivision framework fusing geometric priori knowledge and a data driving strategy. According to the method, nine basic topology filling templates covering triangles to hexagons are predefined as discrete action spaces, and continuous geometric segmentation is converted into a sequence decision problem; learning a mapping relation between the polygon state characteristics and the optimal template selection strategy by using a deep Q network, and balancing exploration and utilization through a dynamic epsilon-greedy mechanism; and in combination with a vertex number priority scheduling strategy and a multi-dimensional quality award function, guiding an intelligent agent to adaptively generate a high-quality quadrilateral grid. According to the method, full-automatic and high-robustness subdivision of the complex polygon area is achieved, the grid orthogonality and the length-width ratio quality are remarkably improved, manual intervention is avoided, and the method is suitable for engineering scenes such as finite element analysis.

The utility model discloses a silicon capacitor electrode structure and a silicon capacitor, which can further improve the capacitance of a capacitor in a limited space by nesting, combining and arranging a plurality of groups of element arrays distributed in a quadrilateral grid mode more reasonably and precisely, so that the capacitor can store more charges.

The utility model relates to a side length reinforced geogrid which comprises a plurality of regular hexagon units arranged in a determinant mode and quadrilateral units located in the regular hexagon units, and the four corners of each quadrilateral unit are located on the four side edges of the corresponding regular hexagon unit respectively. First reinforcing ribs which are arranged in a crossed mode and serve as rectangular diagonals are further arranged in the quadrilateral units. The quadrangle units are arranged in the regular hexagon units, the corners of the quadrangle are located on the four side lengths of the hexagon, and therefore the strength of the side lengths of the regular hexagon units is enhanced, meanwhile, the strength of the side lengths of the regular hexagon units is further enhanced through the arrangement of the first reinforcing ribs, and the stress strength of the corners of the quadrangle is improved; the interlocking effect is improved, and meanwhile the supporting strength in the quadrangle is enhanced.

The application aims to provide a stress-based 3D printing continuity path planning method. The application obtains a to-be-printed model, discretizes the to-be-printed model into a hexahedral grid, the side length of the grid is twice the printing path width, and the height is the pre-printed layer thickness, and the principal stress field is obtained by using finite element analysis. Since the path is generated on a two-dimensional quadrilateral grid, the principal stress direction field is projected onto the two-dimensional domain. For the stress value of the unit close to zero, the stress direction is arbitrary, a method of uniform principal stress direction field is proposed, the stress line is extracted from the principal stress direction field, a plurality of connection rules are adopted, the isolated points are eliminated, and the continuity is optimized. Finally, each stress line is offset to generate a path with a closed loop, and different paths are connected to generate a globally continuous path. In addition, the extrusion rate is adjusted adaptively according to the path direction to alleviate the overfilling problem caused by grid discretization. The model printed by the method has strong mechanical properties under the premise of guaranteeing the surface quality and the curved surface accuracy.

The invention discloses a wing quadrilateral unit structure finite element model automatic construction method and device, equipment and a medium, and relates to the technical field of aerospace, and the method comprises the steps: determining third coordinate data of a wing middle section based on a target control parameter, first coordinate data of a wing root section and second coordinate data of a wing tip section; based on the first coordinate data, the second coordinate data and the third coordinate data, constructing an airfoil geometric parameterized model by utilizing a preset interpolation method, generating target grid control points and target grid control edges corresponding to the wing root section, the wing tip section and the wing middle section respectively, and determining a first grid control edge connecting the wing root section and the wing middle section, the second grid control edge is connected with the wing middle section and the wing tip section; and determining a wing quadrilateral unit structure finite element model file based on the first quadrilateral mesh of the skin, the second quadrilateral mesh of the wing rib and the third quadrilateral mesh of the wing spar. And a high-fidelity structural finite element model is efficiently constructed.

A computer-implemented method and apparatus for generating a quadrilateral grid from an image with an alpha channel. The method includes receiving an image with an alpha channel depicting a shape mapped onto a 3D surface, vectorizing the shape to create a vector path, determining corners by calculating a centroid and identifying the points, correcting a winding order to ensure a clockwise orientation, constructing a quadrilateral grid by setting sub-paths based on detected corners, resampling the sub-paths to match specified rows and columns, performing weighted interpolation across the grid using inverse square distance weighting, and outputting the generated quadrilateral grid for display on a computer device. The apparatus comprises a processor configured to execute these steps, including vectorizing the shape, determining corners, correcting the winding order, constructing and resampling the grid, performing weighted interpolation, and subdividing the 3D mesh for flexible manipulation and extrapolation.

The invention provides a communication system operation and maintenance management method and system applying data analysis, and relates to the technical field of data processing.The method comprises the steps that 1, original data streams of equipment operation data and service data are collected in real time, the original data streams are divided according to a preset time window, and the divided original data streams are obtained; mapping the multi-dimensional data in each window into a point cloud data set in a high-dimensional space; 2, based on the point cloud data set, spatial distribution characteristics are extracted through principal component analysis, and a virtual reference plane representing the state is constructed; and step 3, delimiting an initial quadrilateral grid on the virtual reference plane, and performing adaptive segmentation on the initial grid according to the density gradient of the point cloud data set to form heterogeneous sub-regions. According to the invention, real-time accurate early warning of communication system abnormity, rapid fault positioning and predictive maintenance based on trend analysis are realized, and the intelligent level of operation and maintenance management and the reliability of the system are effectively improved.

The application discloses a kind of thermal-mechanical-phase field coupling simulation methods of concrete mesoscopic thermal cracking, the present application is based on the numerical simulation method of mesoscopic concrete thermal cracking based on phase field theory, comprising the following steps: establishing mesoscopic concrete model, mainly including aggregate mortar and interface transition zone;According to the thermodynamic parameters of each component of mesoscopic concrete obtained according to data reference or physical test;Determine the thermodynamic boundary condition according to the environment of concrete;Free triangle or quadrilateral element is used to disperse mesoscopic concrete model, and determine solving error;Thermal-mechanical-phase field damage coupling model is used to solve the cracking process of concrete model under the action of temperature.The application considers the heterogeneous structure of concrete, establishes a thermal-mechanical damage coupling model based on the phase field fracture theory, and the coupling mode is more in line with engineering practice, which can provide calculation basis for concrete cracking caused by temperature and provide guiding opinions for safety evaluation of hydraulic concrete structure.

The invention discloses a method for creating a long-distance closed mesh surface model, electronic equipment and a storage medium, and the method comprises the steps: obtaining the position of a reference line in a three-dimensional space based on a route design result of linear engineering; analyzing the cross section graph, and constructing cross section component data; establishing a constraint relation of points in the cross section graph based on the reference point, and configuring a label for each constraint; generating an initial stake number list according to a preset segment interval, and dynamically inserting encryption points based on the curve type and combining the encryption points into the initial stake number list to form a final stake number list; mapping corresponding points in the cross section to a three-dimensional space according to the relative coordinates and the plane unit normal vector, and generating a cross section placement list; and on the basis of the cross section placement list and the cross section component data, constructing quadrilateral grids between adjacent cross sections, splicing the quadrilateral grids to generate transition grid surfaces, and forming a closed grid surface model by combining starting and ending transverse grids. According to the method, the precision and efficiency of long-distance linear engineering three-dimensional modeling are remarkably improved.

The pure quadrilateral partition intelligent generation method based on the diffusion model comprises the following steps: S1, a global integer linear programming model containing a plurality of objective functions is constructed, and a quadrilateral grid which is symmetrical and aligned is generated by minimizing the objective function; S2, a two-dimensional contour graph of a CAD model is obtained according to an open source three-dimensional CAD model data set ABC; a triangular mesh model is generated according to the two-dimensional contour graph; S3, boundary fairing treatment is performed on the triangular mesh model, and hole digging and random segmentation are further performed in the interior; S4, a signed distance field is generated according to the triangular mesh model; a pure quadrilateral partition is extracted according to the quadrilateral grid; and a model outer contour image is obtained according to the pure quadrilateral partition; S5, a pure quadrilateral partition generation diffusion model is constructed; and the pure quadrilateral partition generation diffusion model is trained by using the signed distance field and the model outer contour image. The pure quadrilateral partition is rapidly generated, and the training time of the diffusion network model is greatly shortened.

The embodiment of the application provides a grid division method for additive manufacturing slice type multilayer structure, which can solve the technical problem of poor grid division capability in the related art. The method comprises the following steps: dividing a surface grid on a first surface, and converting a second surface into a point cloud result. According to process constraints, matching grid nodes and surface nodes to obtain surface node pairs. In this way, not only the geometric shape is considered, but also the additive manufacturing layering process. According to the surface node pairs, based on a quadrilateral grid, layered hexahedron-based finite element units are divided, that is, a volume grid is generated through the surface grid. While achieving rapid grid division, the stability of various spatial surfaces is ensured, and a grid division algorithm with high automation degree, good stability and good grid quality is realized. The grid division is performed on the additive manufacturing slice type multilayer structure, the material direction and the layering direction are accurately specified, and the efficiency and accuracy of simulation calculation of the additive manufacturing slice type multilayer structure are improved.

The embodiment of the invention discloses a map boundary region construction method and device, electronic equipment and a storage medium, and the method comprises the steps: generating a regular quadrilateral grid according to an original grid resolution, enabling vertexes to accurately correspond to pixel boundary intersection points, and enabling each patch unit to map a single pixel region; calculating a geometric center coordinate of the patch and sampling raster data to obtain a pixel region identification code; traversing adjacent edges of the grid, and screening edges with different identification codes on two sides to form a discrete boundary line segment set; based on the vertex connection relation, recombining the discrete line segments into a geometrically connected boundary broken line set through depth-first traversal; a parameterized path geometry grid is generated based on a broken line, and real-time width adjustment and subdivision precision are supported. According to the method and the device, the common problems of sawteeth and mosaics in traditional grid boundary visualization are solved, and the visual performance effect of a game scene is remarkably improved.

The invention aims to provide the space step-shaped steel structure roof structure system adapting to modularization, and the large-span space step-shaped steel structure roof structure system solves the problem that a traditional regular geometric unit is difficult to adapt to a step-shaped discontinuous space form. The device comprises a plurality of rectangular modular units, and the rectangular modular units are in an orthogonal grid shape; each multi-cavity conversion node is correspondingly connected with the four rectangular modular units, and the connection heights of the four rectangular modular units and the same multi-cavity conversion node are discontinuously changed in a step shape; the plurality of structural rod pieces are arranged in an orthogonal grid shape, and the end part of each structural rod piece is correspondingly connected with the bottom of the corresponding multi-cavity conversion node; and each lattice supporting piece is correspondingly arranged below the corresponding multi-cavity conversion node, and the other end of each lattice supporting piece is connected with the building main body. The invention is applied to the technical field of steel structure roof structures.

The application discloses a structure surface grid automatic generation method based on topological filling, and relates to the technical field of aerospace engineering simulation and grid generation. The method comprises the following steps: intelligently dividing a three-dimensional CAD model into parts to obtain parts with semantic labels and geometric contours; sequentially performing ordered topological filling on each part according to a preset order, adjusting the number of intersection edge points of adjacent parts to ensure grid connection, and generating topological lines; projecting the topological lines onto the model surface for calibration; adaptively interpolating the projected topological lines based on model curvature and simulation conditions to generate point cloud data; generating an initial quadrilateral grid based on the point cloud; projecting the initial grid nodes onto the model surface again and optimizing the quality, and outputting the final grid. The application realizes end-to-end automatic generation from a CAD model to a high-quality surface grid, eliminates manual intervention, ensures the natural matching of grids between parts, and significantly improves the grid generation efficiency and quality.

The application discloses a smooth finite element-Newmark calculation method for underwater target transient acoustic scattering, and belongs to the technical field of underwater transient acoustic scattering numerical simulation. First, a calculation domain of an underwater transient acoustic scattering field is discretized into a standard quadrilateral element grid, and an acoustic pressure field interpolation format is constructed. The quadrilateral element is divided into multiple smooth domains, a smooth acoustic pressure gradient field is obtained through acoustic generalized gradient smoothing technology, and a smooth acoustic pressure gradient matrix is obtained through Gaussian integration. A system matrix equation is constructed in combination with a transient acoustic scattering control equation and a Galerkin weighted residual value method. A parameter-optimized Newmark time integration method is used to complete time domain discretization and recursive solving, and numerical results of the transient acoustic scattering field are obtained. The application softens the system stiffness matrix through gradient smoothing technology, reduces spatial discretization error, eliminates time domain false numerical damping, and has higher precision than the standard finite element method under the same grid, thereby providing an efficient and reliable scheme for underwater transient acoustic scattering engineering calculation.

The application provides a communication system operation and maintenance management method and system applying data analysis, relates to the technical field of data processing, and the method comprises the following steps: step 1, collecting the original data flow of equipment operation data and service data in real time, dividing the original data flow according to a preset time window, and mapping the multidimensional data in each window into point cloud data set in a high-dimensional space; step 2, based on the point cloud data set, extracting spatial distribution characteristics through principal component analysis, and constructing a virtual reference plane representing a state; step 3, drawing an initial quadrilateral grid on the virtual reference plane, and adaptively segmenting the initial grid according to the density gradient of the point cloud data set to form a heterogeneous sub-region. The application realizes real-time and accurate early warning of communication system abnormalities, rapid fault positioning and predictive maintenance based on trend analysis, and effectively improves the intelligent level of operation and maintenance management and the system reliability.

This invention discloses a smoothed finite element adjustable damping implicit integral algorithm for underwater transient acoustic scattering, belonging to the field of underwater transient acoustic scattering numerical simulation technology. First, the computational domain of the underwater transient acoustic scattering field is discretized into a standard quadrilateral element mesh to construct an interpolation scheme for the sound pressure field. Then, each quadrilateral element is divided into multiple smooth domains, and the smoothed sound pressure gradient matrix is ​​obtained through acoustic generalized gradient smoothing technology. Combining differential control equations, the virtual displacement principle, and the Galerkin weighted residual method, the system matrix equation is constructed. An adjustable damping implicit time integral algorithm is used to complete the time-domain discretization, and the numerical results of the transient acoustic scattering field in the entire time domain are obtained through recursive solution. This invention can soften the "overly stiff" stiffness matrix to reduce spatial discretization errors, suppress high-frequency errors through adjustable numerical damping matching, and achieve coordinated control of spatiotemporal errors. Under the same mesh, its accuracy is superior to the standard finite element method, providing an efficient and reliable solution for underwater transient acoustic scattering engineering simulation.

The invention discloses a method for automatically generating a finite element model of a wing hexahedron element structure, and belongs to the field of multi-physics field coupling numerical simulation. Comprising the steps that a radial basis interpolation model driven by a curve distance is adopted, topologically consistent wing root and wingtip quadrilateral grids are generated, geometric and topological mapping from two dimensions to three dimensions is achieved through control point alignment and spanwise over-limit interpolation, a wing is divided into 10 parameterized blocks, internal nodes are generated through tensor product interpolation, and the internal nodes are divided into 10 parameterized blocks. And combining repetitive nodes based on a spatial hash algorithm, and constructing a globally consistent hexahedral unit topology. According to the method, full hexahedron unit generation can be ensured, and the generation efficiency is remarkably improved compared with that of a manual interactive method.

The invention discloses an orchestrable highway tunnel lining surrounding rock multi-medium seepage analysis system and method.The method comprises the steps that firstly, contour lines are automatically generated based on section parameters, a section contour is obtained through sweeping and truncation, and quadrilateral grids are generated; quadrilateral grids of the tunnel lining surrounding rock section are automatically grouped, permeability coefficients and boundary water heads are mapped, and after a water head field is solved, seepage pressure scalar quantity and specific flow vector distribution are output; a sample library is constructed, machine learning regression is adopted to predict the Tunnel 3D key unit seepage pressure, the confidence coefficient is output, and in combination with boundary clamping, interface gradient constraint, adjacency graph smoothing and residual error driven section encryption recharge updating, three-dimensional coloring visualization and standardized output of a seepage analysis result are achieved. According to the method, the modeling automation and traceability are improved, the cross-mileage result consistency and visualization readability are improved, the three-dimensional global numerical solution cost is remarkably reduced, and the reliability and engineering applicability of seepage analysis are improved through physical constraints and self-adaptive closed loops.

The application discloses a kind of polygon quadrilateral grid automatic subdivision methods based on deep reinforcement learning, it is related to the field of computational geometry and grid generation, the application constructs a kind of automatic subdivision framework of fusion geometry priori knowledge and data-driven strategy.The method predefines 9 kinds of basic topological filling templates covering triangle to hexagon as discrete action space, converts continuous geometry segmentation into sequence decision problem;The mapping relationship between polygon state characteristics and optimal template selection strategy is learned using deep Q network, and exploration and utilization are balanced through dynamic epsilon-greedy mechanism;Combining vertex number priority scheduling strategy and multidimensional quality reward function, guide agent to adaptively generate high-quality quadrilateral grid.The application realizes the full-automatic, high robustness subdivision of complex polygon region, significantly improves the grid orthogonality and aspect ratio quality, avoids manual intervention, and is suitable for finite element analysis and other engineering scenarios.

The application relates to the technical field of free surface machining, and particularly discloses a laser additive manufacturing method for a free surface circuit, which specifically comprises the following steps: extracting a curved surface metal conductor model; dividing the curved surface metal conductor model into a plurality of quadrilateral grids, calculating the curvatures of each vertex in each quadrilateral grid, obtaining the average value of the curvatures of the positions of the vertices, and dividing a galvanometer processing area; according to the minimum normal angle principle, solving the optimal processing posture of each galvanometer processing area, and calculating the parameters of five mechanical movement axes; in each galvanometer processing area, the laser incidence angle under the optimal processing posture is determined; and the laser parameters are matched according to the laser incidence angle. By controlling the position between the laser and the free surface circuit, the laser can be incident on each processing area with the smallest incidence angle, and meanwhile, the laser micro additive manufacturing processing of the free surface surface circuit can be realized in a high-efficiency, high-precision and high-reliability mode by dynamically associating and controlling the laser parameters and the incidence angle.

The invention provides a VOF-based numerical simulation method for a welding spot cavity of a vacuum vapor welding, which comprises the following steps: creating a BGA welding spot two-dimensional model and presetting a plurality of bubbles, simulating the flowing of a welding flux by adopting a laminar flow model, and simulating the interface of the welding flux and the bubbles by adopting a multiphase flow VOF model. A multi-area method quadrilateral mesh is adopted, and a UDF user-defined program is matched to simulate a flow field when bubbles escape from the solder; and meanwhile, by improving boundary condition setting, the calculation time is shortened, the calculation efficiency is improved, and the process that bubbles escape from the BGA welding spots in the welding process is rapidly and truly simulated.

The invention discloses a singular point topology alignment-based model processing method and device and a storage medium, and relates to the technical field of model processing, and the singular point topology alignment-based model processing method comprises the steps of constructing a first regular family structure corresponding to a half structure of a model grid, the first normal family structure comprises at least one first normal family, and the first normal family comprises at least one dual string; based on the first normal family of which the width is greater than a preset width threshold value, searching to obtain a spiral dual string in the model grid; searching and eliminating a spiral path of the spiral dual chord so as to eliminate spirals in the model grid; constructing a second regular family structure of the model grid after the helix is eliminated; and processing the second regular family structure based on string drawing and / or string filling so as to align non-spiral dual strings of the model grid and obtain the model grid after topology alignment. According to the method, singular point fragments of the full-quadrilateral grid are reduced, and the fragment size is increased, so that the structured degree and the grid quality of the grid are improved.

The invention relates to a two-dimensional hydrodynamic model grid partition optimization method based on a hybrid neural network, and the method comprises the steps: generating a two-dimensional quadrilateral grid based on a physical boundary, and storing the topological structure data of the grid; dividing a grid needing to be optimized into a plurality of sub-grids, and storing common edge data of a sub-grid set and a remaining grid set; performing grid orthogonality optimization on the grids in the remaining grid set; sequentially carrying out orthogonality optimization on the sub-networks in the sub-grid set by using a physical information neural network; a bidirectional data updating mechanism of adjacent sub-grids is constructed, and collaborative linkage of sub-grid optimization is realized; and combining the optimized sub-grid set and the residual grid set according to a rule to obtain an optimized quadrilateral grid. The hydrodynamic model is split into sub-grids and residual grids through a partition optimization strategy, so that the calculation amount is remarkably reduced, and the optimization efficiency is improved; the hybrid optimization mode of combining the physical information neural network and the traditional grid correction algorithm avoids local optimum and improves the optimization quality.

A computer-implemented method and apparatus for generating and refining synthetic images of customizable products. The method includes receiving a text prompt describing a product and a desired markup, generating a synthetic image using a generative AI system, validating the image against physical product specifications, mapping the image onto a 3D surface using quadrilateral grid interpolation, applying inpainting techniques to remove the markup while preserving fabric details, incorporating lighting and specular effects to enhance realism, and integrating the enhanced image into an interactive asset for user interaction and customization prior to manufacturing. The apparatus comprises a generative AI system, a validation and correction module, a 3D mapping and image synthesis module, an inpainting module, an interactive asset creation system, depth estimation and mapping tools, and a lighting and specular effects module. The system supports real-time customization and multiple design variations, ensuring conformity with physical specifications.

The present invention discloses an application expansion method, device and equipment for a CFD immersed boundary geometry capture algorithm, comprising the following steps: S1, establishing a solid boundary grid and a fluid grid; S2, dividing each quadrilateral grid unit in the solid boundary grid into two triangles; S3, constructing a first envelope block and a second envelope block; S4, determining a first projection point and a second projection point based on the second envelope block intersecting with the first envelope block; S5, determining the vector of the center point of the grid unit in the fluid grid and the algebraic distance from the first projection point to the center point of the grid unit in the corresponding fluid grid; S6, determining the position attributes of the grid unit in the fluid grid corresponding to each first projection point based on each algebraic distance, thereby judging whether it is in the actual fluid; S7, calculating the position attributes of the remaining grid units in the fluid grid using a flood algorithm; S8, determining the pierced triangular grid unit and the coordinates of the piercing point of the triangular grid unit.

The invention discloses a structure surface grid automatic generation method based on topology filling, and relates to the technical field of aerospace engineering simulation and grid generation. The method comprises the following steps: carrying out intelligent component subdivision on a three-dimensional CAD model to obtain components with semantic tags and geometric contours of the components; sequentially executing ordered topology filling on each component according to a preset sequence, cooperatively adjusting intersection edge points of adjacent components to ensure grid connection, and generating a topological line; projecting the topological line to the surface of the model for calibration; performing adaptive interpolation on the projected topological line based on the model curvature and the simulation working condition to generate point cloud data; generating an initial quadrilateral grid based on the point cloud; the initial grid nodes are projected to the surface of the model again, quality optimization is carried out, and a final grid is output. According to the method, the end-to-end automatic generation from the CAD model to the high-quality surface grid is realized, the manual intervention is eliminated, the natural matching of the grids between the parts is ensured, and the grid generation efficiency and quality are remarkably improved.

The application discloses a wing quadrilateral element structure finite element model automatic construction method and device, equipment and medium, and relates to the field of aerospace technology, and comprises the following steps: determining third coordinate data of a wing middle section based on target control parameters, first coordinate data of a wing root section and second coordinate data of a wing tip section; constructing an airfoil geometric parameterized model based on the first coordinate data, the second coordinate data and the third coordinate data and by using a preset interpolation method, generating target grid control points and target grid control edges corresponding to the wing root section, the wing tip section and the wing middle section respectively, determining a first grid control edge connecting the wing root section and the wing middle section, and a second grid control edge connecting the wing middle section and the wing tip section; and determining a wing quadrilateral element structure finite element model file based on a first quadrilateral grid of a skin, a second quadrilateral grid of a wing rib and a third quadrilateral grid of a wing spar. The method is used for efficiently constructing a high-fidelity structural finite element model.

The application discloses a smooth finite element-Bathe calculation method for underwater target transient acoustic scattering, and belongs to the technical field of underwater transient acoustic scattering numerical simulation. Firstly, a sound scattering field calculation domain is discretized into a quadrilateral element grid, and an acoustic pressure field interpolation format is established; then, an element smooth domain is divided, a smooth acoustic pressure gradient matrix is obtained through acoustic generalized gradient smoothing technology, and a system matrix equation is constructed in combination with a transient acoustic scattering control equation and a Galerkin weighted residual value method; time domain discretization is completed through the Bathe time integration method, and iterative solution is carried out, so that full-time domain numerical results of the transient acoustic scattering field are obtained. Through the gradient smoothing technology, the spatial discretization error is reduced, error cooperative suppression is realized in combination with the frequency self-adaptive numerical damping of the Bathe integration method, the precision is higher and the stability is better than those of the standard finite element method under the same grid, and an efficient and reliable scheme is provided for underwater transient acoustic scattering engineering solution.