24 results about "Solid modeling" patented technology

The invention discloses a five-axis numerical control machining simulation-oriented tool swept volume entity modeling method, which comprises the following steps of: firstly, describing a tool shaft section contour line by adopting a rotation contour point, and constructing a tool rotation body model through connection of a tool layer and a triangular surface; secondly, a calculation method of a cutter axis point velocity vector is provided by classifying cutter movement tracks in machining; secondly, calculating a normal vector of a point on the cutter layer, and solving a critical contour point and a reserved point of the cutter layer by combining an envelope theory; then, a construction method of a tool swept volume surface contour point set is researched, and a closed triangular mesh surface of the swept volume is constructed by using a contour point sequence number corresponding relation; finally, the effectiveness of the algorithm is verified through a tool swept volume generation result under various motion trails. The method is suitable for various cutter types, and can meet the requirements of numerical control machining simulation.

The present invention discloses a modeling method for a non-rotational airborne radar radome, comprising: performing surface configuration and solid modeling on the non-rotational surface airborne radar radome to obtain a reconstructed digital model of the non-rotational airborne radar radome; and generating a frequency selective surface of the non-rotational airborne radar radome based on the digital model of the non-rotational airborne radar radome. The present invention realizes the precise creation of the digital model of the non-rotational airborne radar radome, so that the finally designed radome product can achieve the initially designed electrical performance index in the actual application environment.

The invention provides an equivalent materialization modeling and efficient simulation method for an additive manufacturing lattice structure, and belongs to the technical field of additive manufacturing and structure simulation. The method comprises the following steps: firstly, designing and preparing a standard test sample consistent with a real sample piece in process according to dot matrix geometric characteristics of the real sample piece, and obtaining equivalent material parameters through mechanical test; secondly, extracting the outer contour of a dot matrix area from the original CAD model, constructing a continuum entity to replace an original dot matrix structure, and fusing the continuum entity with an entity area to form a simplified model; and endowing equivalent material parameters to the entity area, and performing thermal-mechanical coupling finite element calculation in simulation software to obtain stress and deformation distribution in the forming process. According to the method, huge calculation overhead caused by full-dot-matrix fine modeling is avoided, the simulation efficiency is remarkably improved, meanwhile, the prediction precision is guaranteed through experiment-driven equivalent material parameters, the method is suitable for various dot matrix configurations and metal material systems, and efficient and high-fidelity simulation of additive manufacturing complex dot matrix components is achieved.

The present invention provides a method for fabricating a three-dimensional randomly undulating structural surface. Step 1: Using the Monte Carlo method, a mathematical model of a two-dimensional randomly undulating structural surface is established. Harmonics of different wavelengths are superimposed to form a randomly undulating surface with varying degrees of undulation. Step 2: The resulting two-dimensional randomly undulating surface is modified into a curved solid, completing the three-dimensional solid modeling of the randomly undulating structural surface. Step 3: The solid model is fabricated using 3D printing technology. Step 4: The three-dimensional randomly undulating structural surface is molded based on the desired structural surface material. This method can quantitatively reflect the surface roughness and random undulation characteristics of actual underground engineering structures, effectively simplifying the fabrication of the randomly undulating structural surface and providing reliable support for fabricating the structural surface for experiments on soil-structure surface contact and shear properties.

The invention belongs to the technical field of graphic processing and three-dimensional modeling, and discloses a fluid impact building damage simulation method and system, and the method comprises solid-liquid mixed virtual simulation, building breaking virtual simulation and impact judgment virtual simulation. The solid-liquid mixing virtual simulation comprises solid modeling, liquid virtual simulation, particle mixing and buoyancy setting, the building crushing virtual simulation comprises building modeling, building pre-crushing and crushing threshold setting, and the impact judgment virtual simulation comprises polyhedron partition division and force field judgment. The fluid impact building damage virtual simulation effect is good, the calculation cost is reduced, the frame rate during virtual simulation is improved, and the universality is high. According to the virtual simulation method considering the mixing condition of the solid phase and the water phase, virtual simulation of a mechanism that the solid phase is carried by the water phase is achieved, pressure brought by collision point detection of liquid and the solid on models such as buildings is reduced, and the method can be used for virtual simulation of disasters such as flood and debris flow.

The utility model discloses an operating platform for BIM (Building Information Modeling), which belongs to the field of operating platforms and is characterized in that an open collecting bin is arranged at the upper end of a collecting box, and solid modeling materials are stored through the open collecting bin; a lighting system mounting bin is formed in the entity modeling table, mounting hole positions are formed in the upper end and the lower end of the entity modeling table, a lighting system controller is mounted on the inner wall of the collecting box, and a lighting system in the lighting system mounting bin is controlled through the lighting system controller so that lighting of entity modeling objects on the surface of the entity modeling table can be achieved. And the modeling computer is fixed at the upper end of the table body, so that an operator can conveniently and efficiently carry out BIM modeling. Seamless connection of virtuality and entity modeling is achieved through the entity modeling table design, and the working efficiency is improved. And the lighting system in the platform and the controller provide sufficient illumination for modeling, so that the modeling precision can be improved. The design of the collecting box facilitates storage and management of modeling materials, convenient control is achieved through an inner wall lighting system controller, and operation convenience and flexibility are improved.

1. The name of the design product: ceramic 3D printer. 2. The use of the design product: for three-dimensional solid modeling. 3. The design features of the design product: in the combination of shape and pattern. 4. The picture or photo that best shows the design features: perspective view 1.

In order to reduce the complexity of underground cavern engineering modeling and improve the modeling efficiency, the invention provides an underground cavern engineering design and analysis integrated CAE modeling method, which has the core that a cavern excavation body, a cavern area mountain and a surrounding rock supporting structure model are obtained from a cavern engineering 3DE design result; an established 3DE underground cavern excavation support modeling pretreatment program drives 3DE to complete cavern step-by-step excavation support entity modeling according to a cavern layered excavation and support design scheme, outputs a key modeling information file, drives Gmsh to reproduce an entity modeling process in 3DE by using the file, and performs mesh generation on a volume entity on the basis, so as to obtain an underground cavern excavation support modeling model. And naming according to the volume entity number in the modeling key information file, and finally outputting a model grid file, so that the underground cave group three-dimensional design result is directly used for carrying out cave group step-by-step excavation support numerical simulation modeling and model grid automatic subdivision.

This invention discloses a non-inertial navigation mobile indoor volume measurement and 3D reconstruction method, equipment, and computer-readable medium, belonging to the interdisciplinary field of precision engineering measurement, computer vision, and digital twin technology. The method includes the following steps: S1, dynamic scanning data acquisition; S2, adaptive data augmentation and cleaning; S3, trajectory and depth calculation based on motion continuity constraints; S4, cross-sectional topology construction and closure constraints; S5, 3D solid modeling preserving volume characteristics; and S6, precise volume calculation based on the solid model. This invention employs the aforementioned non-inertial navigation mobile indoor volume measurement and 3D reconstruction method, equipment, and computer-readable medium, and through a single-line 2D LiDAR combined with innovative algorithms, achieves mobile high-precision volume measurement and high-fidelity 3D reconstruction of irregular indoor spaces under low-cost hardware conditions.

The invention discloses a nuclear power cooling tower structure safety analysis intelligent agent operation and maintenance method based on an industrial physics AI engine, relates to the technical field of nuclear power, and provides a method for simulating concrete and double-layer two-way reinforcing steel bar layers by adopting a common-node multi-layer shell unit, and considering normal bias of each reinforcing steel bar layer relative to the middle surface of a tower wall; according to the method, three-dimensional solid modeling of a reinforced concrete structure is replaced with a traditional method, the number of degrees of freedom of the model is reduced on the premise that real structure composition is reflected, and in the aspect of material nonlinearity, a nonlinear damage model and a linear hardening model are adopted for simulating mechanical behaviors of concrete and steel bars respectively; the integration of the independent nonlinear constitutive model of the reinforced concrete, the superposition calculation of the total tangent stiffness matrix and the separation and extraction of the stress result of the reinforced concrete are realized, so that the solving efficiency and precision are improved, a more efficient finite element industrial engine is accessed to the AI intelligent operation and maintenance service flow of the nuclear power cooling tower, and the stability and damage condition of the cooling tower are intuitively predicted.

The present invention provides a tunnel blasting method based on intelligent identification of surface cracks and internal rock properties. The specific steps include: S1: performing three-dimensional laser scanning on the tunnel face to obtain point cloud data, and solid modeling based on the processed point cloud data; S2: identifying the joints on the face based on the solid modeling, and using a numerical calculation program to perform numerical calculation and analysis on double-hole blasting of rock at different joint angles to obtain numerical simulation results of the crushing zone; S3: based on the numerical simulation results of the crushing zone, designing the tunnel blasthole parameters and blasthole layout, drilling, obtaining the blastholes to be blasted, and recording the blasthole data; S4: storing the blasthole data in a lithology parameter database, and performing three-dimensional solid modeling of the rock mass for the blastholes to be blasted; S5: calculating the charge amount for the blastholes to be blasted, and blasting the tunnel. By combining surface cracks and internal rock properties in the blasting method, the present invention provides a specialized blasting plan based on the face information.

The invention belongs to the technical field of continuous casting, and particularly relates to a numerical simulation method for flow field distribution of a continuous casting tundish, compared with a traditional method, solid modeling is replaced by a porous medium model, geometric construction of a solid area in a continuous casting tundish computational domain is greatly simplified, structured grids can be adopted, and the flow field distribution of the continuous casting tundish can be simulated. The solution precision and the calculation efficiency are improved, and an efficient and accurate solution is provided for numerical simulation of the continuous casting tundish.

The invention aims to provide a UG-based axial flow compressor blade three-dimensional modeling method, and belongs to the field of turbomachinery. The method comprises the steps that firstly, blade grid molded line data points are imported into UG software, and editable blade grid molded line data points are obtained; secondly, sequentially editing blade grid molded line data points of each section, drawing a leading edge / trailing edge small circle, checking the blade grid molded line data points, bridging a suction surface / pressure surface spline curve with the leading edge / trailing edge small circle, adjusting a curvature comb of the bridging curve, connecting the suction surface / pressure surface spline curve with the leading edge / trailing edge small circle, and trimming the leading edge / trailing edge small circle; checking whether a suction surface / pressure surface molded line is intersected and tangent with a leading edge / trailing edge small circle or not; constructing a three-dimensional blade body entity by the edited blade grid molded lines of the sections in a curve group form; and finally completing three-dimensional solid modeling of the blade. According to the method, the fairing requirement of the blade profile is met, the fairing requirement of the blade body is also met, the requirement of numerical calculation is met, and the requirement of machining is also met.

The invention is applicable to the field of processing and manufacturing of electro-hydraulic servo valve slide valve pairs, and provides a servo valve slide valve pair overlap amount measuring method combined with a digital modeling technology, which comprises a valve core and valve sleeve refined feature extraction device, a digital analysis module, a multi-dimensional indirect measuring device and an intelligent analysis system. According to the method, measurement errors can be corrected, temperature and assembly stress distribution can be measured through a temperature sensor and a strain rosette, digital simulation setting is input, and sliding valve pair overlap amount measurement errors caused by temperature and assembly stress factors are effectively corrected through learning of an intelligent analysis system; a novel three-dimensional scanning modeling method is adopted to measure an actual three-dimensional model of the valve element and the valve sleeve, and a digital solid modeling analysis method is adopted to consider the influence of the microscopic characteristics of the valve element and the valve sleeve on the static characteristics of the slide valve pair; and integrating a digital test result based on a big data analysis technology.

The present invention relates to a thermal stress simulation method during the tempering process of ultra-thin glass, comprising the following steps: S1, creating an ultra-thin glass plate tempering model, selecting a group of ultra-thin glass plates with vertical jets as stress simulation objects, establishing a calculation domain for the ultra-thin glass, wherein the calculation domain includes a flow field region inside a nozzle, a flow field region at the interface between the nozzle and the glass plate, and a solid field region of the glass plate; S2, defining material properties, discretizing the model into a grid model after solid modeling, first defining the elastic modulus E and Poisson's ratio μ of the glass by defining unit properties and grid generation control, then setting the flow field material to air, and setting the changes of the thermophysical parameters of the glass with temperature; providing accurate numerical values for the thermal stress simulation of the ultra-thin tempered glass, improving the accuracy of the stress simulation results, selecting a suitable glass quenching optimization scheme from the scheme, and providing a scheme for further research in the future.

The invention provides a scene construction method and device for antenna same-address interference simulation evaluation, and the method comprises the steps: S1, obtaining and processing high-precision geographic data which comprises remote sensing image data, DEM data, vector map data, three-dimensional city model data and oblique photography data; s2, terrain grid generation and three-dimensional solid modeling are carried out; s3, scene instance configuration and scene instance editing: the scene instance configuration is to arrange an antenna instance and an obstacle instance on the basic scene model, select a propagation model for the antenna instance and set parameter information of the antenna instance; and S4, scene data storage and management, specifically including database and file mixed storage, scene loading and scene output. The design accuracy and reliability are improved, and the accuracy and reliability of the antenna simulation design are greatly improved through the geographic scene and the three-dimensional map in combination with the classic propagation model.

In example embodiments, a proprietary implementation of solid modeling is provided at run-time as a binary to an open-source infrastructure modeling platform. The binary includes functionality of a solid modeling module that manipulates and uses BReps that represent geometry of elements of an infrastructure model. When an application that utilizes the open-source infrastructure modeling platform requires solid modeling, it may have a backend module call an exposed function of a DLL that returns a pointer to the binary. The backend module uses the pointer to create a session, which may be divided into a number of individual partitions that each correspond to one of its individual threads. BReps may be assigned to individual partitions. When a thread requires BReps to be manipulated and / or used, the corresponding partition may be used to acquire the needed BReps, perform the solid modeling operations, and either return results or an error.

The invention discloses a refined modeling method and device for a designed tenon structure based on mapping coordinates, and belongs to the technical field of modeling of a tenon structure of a composite fan blade, and the method comprises the steps: carrying out the initial filling of a laying layer, obtaining an initial filling image of the laying layer, and enabling the out-of-plane direction of a sample image to be parallel to the thickness direction of the laying layer structure; laying layer sequence adjustment, laying layer morphology drawing and plane laying layer drawing are carried out in sequence; and finally, carrying out three-dimensional solid modeling on the tenon structure. According to the method, automatic plane laying layer drawing is achieved, manual intervention is not needed, the workload is greatly reduced, and the influence of human factors on the modeling result is avoided.

The invention relates to a pantograph-catenary high-speed sliding process simulation method, which comprises the following steps of: establishing a high-precision contact line model by adopting a solid modeling mode, applying a preset vertical vibration curve to a starting point of the contact line model by adopting a forced driving mode so as to lift the starting point of the contact line model, and providing speed and lifting force for a pantograph model at the same time so as to simulate the pantograph-catenary high-speed sliding process. When the starting point of the contact line model reaches the highest point, the pantograph model makes contact with the position below the starting point of the contact line model under the conditions that the lifting force at the target speed reaches the target running speed, and then the pantograph model completes the whole process of the contact line model according to the target speed; according to the method, a solution with operability is provided for transient process simulation of the contact line model under the action of the pantograph model, so that equivalent simulation of the dynamic contact process of the pantograph and the contact line can be realized through the short contact line entity model, and the simulation efficiency and the simulation precision are improved.

This invention discloses a method for constructing a biomimetic lattice model based on Grasshopper, comprising the following steps: establishing a regular point lattice in space using an arithmetic sequence; generating cubes of the same size centered on points of the regular point lattice; generating an irregular random point lattice within a sphere, and subjecting the irregular random point lattice to random, varying degrees of jitter; generating three-dimensional Voronoi polygons from the generated irregular random point lattice, and using the three-dimensional Voronoi polygons to generate a biomimetic lattice model with a three-dimensional Voronoi irregular porous structure; and subdividing the biomimetic lattice model to obtain a smoothed biomimetic lattice model. The technical solution of this invention can achieve solid modeling of various biomimetic lattice models with different requirements by adjusting the parameters set on the arithmetic unit.

The invention discloses a power transmission tower three-dimensional entity parameterization rapid modeling method, and belongs to the technical field of three-dimensional entity modeling. According to the method, tower main body supporting structure logic is accurately constructed through topological framework extraction, constraint conflicts are efficiently solved by combining framework parameter global optimization, accurate three-dimensional coordinates are output, and it is ensured that the model meets the actual machining requirement through entity generation of the component with tolerance; according to the method, joint plate prototype matching and self-adaptive adjustment (including bolt hole group optimization arrangement) are achieved by means of joint automatic design, matching model compliance verification guarantees that components and joints conform to design specifications, parameterization, automation and high efficiency of three-dimensional solid modeling of the power transmission tower are achieved in the whole process, the modeling precision and efficiency are greatly improved, and the method is suitable for large-scale popularization and application. Manual intervention is reduced, it is ensured that the model has design rationality and engineering practicability, and reliable technical support is provided for design, machining and construction of the transmission tower.

This invention discloses a method for predicting turbine blade flutter. The key point is the coupling of a real physical model of unequilibrium wet steam with the influence coefficient method for predicting flutter in the last-stage long blades of a turbine. This involves solid modeling of the last-stage moving blade, modal analysis, and harmonic response analysis, and constructing a nine-channel fluid domain for influence coefficient method calculations. The extracted main mode shapes are then interpolated onto the CFD nodes of the nine-channel fluid domain using a three-dimensional linear interpolation method. Furthermore, by modifying the wet steam model to accurately characterize the two-phase flow characteristics of the last-stage wet steam, unsteady flow field calculations using the nine-channel influence coefficient method are performed to obtain the aerodynamic damping coefficients for different nodal diameters. This enables the prediction of the flutter stability of the last-stage moving blades and the identification of critical nodal diameters. This significantly reduces the time cost of recalculating the tip phase angle for each blade throughout the entire revolution and improves the physical reliability and reproducibility of the prediction.

This invention discloses a method for mold electrode modeling based on topological point cloud sampling and PointNet++. First, a workpiece entity model containing electrode machining features is acquired. Point cloud sampling is used to obtain sampling point data on the model surface. The sampling points inherit the color ID of the original geometric surface and retain topological identifiers. Combined with a preset color ID-label ID mapping table, an electrode machining feature point cloud dataset is constructed. Then, this dataset is used to train an electrode machining feature recognition network based on the PointNet++ architecture. For the workpiece model to be processed, a point cloud is generated using the same sampling mechanism and input into the model to obtain predicted labels for each sampling point. Then, relying on the topological identifiers stored during sampling, the point cloud prediction results are traced back to the workpiece entity's geometric surface to achieve coloring of the machining area features. Finally, a bounding box is generated based on the colored surface region. Through Boolean operations, redundancy removal, combined with intensity optimization and base addition, the electrode entity modeling is completed. This invention can significantly improve the efficiency of mold electrode machining feature recognition and electrode modeling.

This invention discloses a modeling method for special threaded joints that considers roughness. It employs WM fractal functions to describe the contour of the rough surface of the special threaded joint, imports the contour coordinate data of the fractal curves into ANSYS finite element analysis software, and constructs a three-dimensional solid model of the special threaded joint containing the rough fractal contour. This invention also discloses a method for verifying the effectiveness of the above three-dimensional model. Using ANSYS finite element analysis software, material and interface properties are defined, the three-dimensional model is meshed and refined, assembly properties are defined, loads and constraints are applied according to boundary conditions, and structural nonlinear static analysis is performed to obtain equivalent stress contour maps and contact pressure curves of the special threaded joint, thereby verifying the model's effectiveness. The modeling method using fractal functions to characterize the rough surface of special threaded joints not only possesses determinism and uniqueness but also accurately describes the morphology of the rough surface, providing an effective and accurate method for refined solid modeling of special threaded joints.