22 results about "Geometric similarity" patented technology

The invention provides a multi-modal matching method and system for identifying repeated components in a BIM model, and relates to the technical field of building information model lightweight, and the method comprises the steps: obtaining BIM format data of to-be-matched component pairs, and separating geometric attributes, semantic attributes and topological attributes of each component from the BIM format data; on the basis of geometric attributes, Hash bucket dividing is carried out on each component, geometric similarity calculation is carried out on component pairs in the same bucket, and a rough matching result is obtained according to the geometric similarity; and generating a multi-dimensional Hash signature of the component by using the geometric attribute, the semantic attribute and the topological attribute, and performing fine registration verification on the rough matching result through the multi-dimensional Hash signature to obtain a final multi-modal matching result which is used for identifying the repeated component in the BIM model. According to the method, geometric attributes, semantic attributes and topological attributes of the components are combined, and the detection speed and accuracy of the repeated components in the BIM model are improved by means of parallel computing, hash acceleration and the like.

The invention belongs to the technical field of bridge steel structure design, and discloses a method and system for determining the arrangement positions of multiple longitudinal stiffening ribs of a steel bridge web, and the method comprises the steps that constraint of a steel top plate, a steel bottom plate and two transverse stiffening ribs on a mother plate is simply supported; dividing the stiffening plate into four-side simply supported sub-grids according to the longitudinal stiffening ribs, calculating bending and shearing buckling coefficients and obtaining critical buckling stress; a bending and buckling coefficient is expressed as a function of a clear distance between longitudinal stiffening ribs based on geometric similarity; and adopting a bending and shearing interaction buckling criterion, recursively solving the position of each longitudinal stiffening rib from a pressed edge, and carrying out constraint screening according to monotonically increasing distance, arrangement not crossing a neutral axis and the like. According to the method, reasonable arrangement can be directly output, and design consistency and efficiency are improved.

The application discloses a model experiment house foundation deformation loading method based on ground fissure morphological change, collects information related to the model experiment, calculates the geometric similarity ratio and the kinematic similarity ratio of the model experiment, investigates the ground fissure at the house position in the field, determines the spatial overlapping relationship and the fissure morphological change stage, determines the initial position of the platform support column and the moving loading mode in combination with the fissure morphological change and the spatial overlapping relationship, and calculates the loading time and the loading rate of the model house foundation deformation. The spatial overlapping relationship between the fissure and the house is comprehensively considered, the simulation experiment result precision of the house deformation damage under the ground fissure is higher, the platform support column moving loading mode is scientifically and comprehensively reflected, and a solid foundation is laid for the subsequent development of the house foundation deformation loading experiment.

A general-purpose grasping method and apparatus for retrieval enhancement in the open world can effectively balance semantic and geometric similarity, providing more reliable knowledge support for grasping point migration, thereby achieving high-precision and highly generalized zero-shot robot grasping point prediction. The method includes: (1) constructing a grasping memory bank, which integrates data from three channels; (2) determining whether the target task is a visible task, if so, executing step (3), otherwise executing step (4); (3) retrieving source domain images of the same category as the object to be grasped by category name; (4) further retrieving source domain images that are semantically and geometrically similar to the object to be grasped from the source domain image set retrieved in step (3); (5) based on the source domain images retrieved in step (4), performing the migration of grasping points from the source domain image to the target image using a diffusion model, and completing the grasping point prediction of the target image.

The invention discloses a model similarity design method suitable for a wave-underwater vibration table test. The method comprises the steps of determining a geometric similarity ratio of a reduced scale model; determining a structural density similarity ratio, a structural elastic modulus similarity ratio and a water density similarity ratio of the reduced scale model; determining a vertical geometric similarity ratio; determining an x-direction geometric similarity ratio under the action of a horizontal earthquake; determining a geometric similarity ratio in a horizontal y direction; the wavelength similarity ratio in the x direction is determined; and determining a wave height similarity ratio and the like. The method has the advantages that the reduced scale model in the design test is adopted, coordination similarity between water and the structure is achieved by changing the cross section size similarity ratio of the structure without changing the structure density similarity ratio, the method is simple and practical, model manufacturing is easy and convenient, and the method is suitable for large-scale production. And a feasible method can be provided for similar design of a wave-underwater vibration table test model under the earthquake-wave action.

The invention provides an assembly integrity identification method and system based on field image and model matching, and the method comprises the steps: obtaining a field image of a to-be-detected device, building an initial space mapping relation based on the field image and a three-dimensional CAD model of the to-be-detected device, and generating a reference geometric model corresponding to the visual angle of the field image; a first geometric feature set is extracted from the field image, and a second geometric feature set is extracted from the reference geometric model; iteratively solving and aligning the optimal geometric transformation of the two feature sets by taking the minimum geometric similarity measurement between the first geometric feature set and the second geometric feature set as a target through an optimization algorithm; and on the basis of the optimal geometric transformation, the inconsistency between the first geometric feature set and the second geometric feature set is analyzed to identify the assembly defect of the to-be-detected device, so that the accuracy and robustness of assembly defect identification in a complex industrial environment are remarkably improved.

A splat generation system and associated methods implement a modified splatting pipeline that quantifies loss at each splat generation iteration without rendering the splats generated at each iteration or comparing the resulting visualization against reference images of a 3D asset. The system receives the 3D asset and generates a splat representation of the 3D asset. The system compares geometric similarity between different sets of generated splats in different regions of the splat representation and different sets of 3D primitives in corresponding regions of the 3D asset. The system adjusts a set of splats in response to the geometric similarity between the set of splats and a set of 3D primitives in corresponding regions not satisfying a threshold, and reconstructs the 3D asset with an acceptable amount of loss based on the adjustments made to the splats on a region-by-region basis.

The invention relates to an engineering site residual deformation prediction method and device based on a physical similarity model. The method comprises the following steps: acquiring earth surface residual deformation time of a target monitoring area and observation time of a preset physical similarity model experiment; determining a time similarity ratio and a first geometric similarity ratio based on the earth surface residual deformation time and the observation time; obtaining prototype residual deformation of the target monitoring area and model residual deformation obtained by monitoring through monitoring equipment; determining a second geometric similarity ratio based on the prototype residual deformation and the model residual deformation; selecting a minimum value in the first geometric similarity ratio and the second geometric similarity ratio as a target geometric similarity ratio; and performing amplification processing on the residual deformation simulation value by using the target geometric similarity ratio to obtain a residual deformation prediction value, and performing amplification processing on the residual deformation simulation time by using the time similarity ratio to obtain a residual deformation duration prediction value. According to the scheme, long-term prediction of the earth surface residual deformation of the target monitoring area is realized.

The invention relates to a job data processing method and device, equipment, a storage medium and a program product, and relates to the technical field of computers. The method comprises the steps that the exhibition stand device obtains current homework data obtained by recognizing current homework of a student; the exhibition stand device performs font feature extraction on characters in the current job data to obtain target stroke features, target structure features and target geometric features of the current job data; the exhibition stand device determines a stroke similarity between the target stroke feature and a standard stroke feature of a preset standard font, determines a structural similarity between the target structural feature and a standard structural feature of the standard font, and determines a geometric similarity between the target geometric feature and a standard geometric feature of the standard font; and generating a current writing evaluation report of the student based on the stroke similarity, the structural similarity and the geometric similarity. By adopting the method, the utilization rate of computer hardware resources can be improved.

The invention discloses a model shrinking method for a ship and bridge collision experiment. The method comprises the following steps: simplifying a ship and bridge collision model; establishing a ship-bridge collision dynamics similarity model; based on the established mechanical similarity model, carrying out ship and bridge collision model shrinkage verification; on the basis of a model shrinkage verification result, performing model shrinkage model optimization iteration; and an optimized shrinkage model is obtained. The invention provides a systematic model shrinkage design method based on geometric similarity, material invariance and dynamic similarity principles. According to the method, a system verification system of an energy consumption path, a force-displacement curve and a failure mode is constructed, and the consistency of a mold shrinkage result and a full-size prototype in multiple dimensions is ensured. According to the optimization iteration design method of the shrinkage model, accurate reduction of complex plastic deformation and energy dissipation characteristics of the ship bow in collision can be achieved.

The invention discloses a contour line displacement river matching method considering spatial geometric similarity, which comprises the following steps of: (1) acquiring a contour line data set intersected with a river, and sorting according to the positions of intersection points to form a new contour line data set containing the intersected river; (2) setting a threshold value, extracting a valley point set of contour lines in the new contour line data set, judging U-shaped valleys and V-shaped valleys, and determining valley points and index positions thereof; and (3) based on the similarity ratio of the arc segments before and after contour line displacement, realizing contour line displacement river matching. According to the method, whether the newly generated arc segment of the contour line is similar to the geometrical shape of the original contour line or not is judged in real time based on the absolute value of the difference value of the ratios of the arc segments before and after the displacement of the contour line by utilizing the idea of an optimal position convergence algorithm, and new data space conflicts are avoided.

The present application discloses a method for representing a crystal structure, a computer device, and a storage medium, and relates to the field of computational materials science technology. The initial spatial position of each atom extracted from the initial representation file is used to determine the neighboring atoms corresponding to each atom, and then the atomic pair distances between each atom and its neighboring atoms are determined; the initial spatial position of each atom is reduced in dimension using the atomic pair distances, and the target spatial position of each atom can be obtained, thereby representing the crystal structure using the target spatial position of each atom to generate a target representation of the crystal structure. The present application reduces the dimensionality of the initial spatial position of each atom by the atomic pair distances between each atom and its neighboring atoms, which not only maps the high-dimensional initial spatial position to a low-dimensional, continuous, and comparable vector representation, but also retains the geometric similarity and symmetry between the crystal structures, thereby solving the problem of poor representation of the crystal structure.

The invention relates to a computer-implemented method for determining a geometric similarity of a search component 20, represented by a search model 22, with a plurality of comparison components, each represented by comparison models, wherein the method comprises the following steps.Providing S10 a trained machine learning model 10, trained in a predefined manner, and a plurality of comparison feature vectors representing features of the comparison models; canonically orienting S11 the search model 22 to generate a canonically oriented search model 24; determining similarity values ​​S12, each representing a similarity of the canonically oriented search model 24 to the comparison models 32, using the trained machine learning model 10 and the plurality of comparison feature vectors; and generating S13 a list 60 of a predefined number of most similar comparison components 30 based on the determined similarity values.

This invention discloses a method and apparatus for comparing BIM components, belonging to the field of Building Information Modeling (BIM). The comparison method includes: converting two BIM components to be compared into BREP expressions, obtaining control points, and establishing a four-dimensional coordinate system; calculating the metric tensor and inertia tensor of the two BIM components based on the four-dimensional coordinates of the control points, constructing an undirected graph with faces as nodes, metric tensors and inertia tensors as node attributes, common edges in the BREP expressions as graph edges, and the angle between the normal vectors of adjacent faces as edge attributes; obtaining geometric similarity by matching the undirected graphs corresponding to the two BIM components; sorting the attribute lists of the two BIM components alphabetically and calculating attribute similarity based on semantic comparison; and calculating a comprehensive similarity based on geometric and attribute similarity to determine whether the two BIM components are similar. The comprehensive calculation of geometric and attribute similarity improves the accuracy of BIM component comparison results and uses fewer calculation points, thus improving efficiency.

The invention relates to the technical field of structural engineering, in particular to a structural dynamic test method for a partially similar model, which comprises the following steps: S1, determining a geometric similarity ratio S1; s2, making a model; s3, installing a sensor; s4, model test and data processing: debugging a test system and loading equipment, and performing a vibration test after the test system and the loading equipment are stable; after the test is finished, original test data are processed, and the inherent frequency fm, the speed response vm, the acceleration response am and the displacement response dm of the model are obtained respectively; and S5, calculating corresponding data of the prototype structure according to a test result. The invention provides the similarity criterion suitable for the dynamic test of the partially similar structure model made of the same material as the prototype material, so that a designer can more accurately invert the dynamic index of the prototype structure according to the model test result, the redundancy of the structure design is reduced, the structure cost is reduced, and the design efficiency is improved. Therefore, an economical and safe engineering structure is designed.

The present invention belongs to the field of tunnel engineering technology, specifically relating to a method and system for testing the mechanical properties of tunnel structures subjected to progressive degradation of primary supports. The method converts geometric similarity ratios based on operating conditions, configures surrounding rock similar materials, and combines similarity theory to determine similar materials and material parameters for support, thereby creating a temperature-controlled deteriorated tunnel structure support model. The present invention characterizes the degradation effect of the primary support structure by adjusting the temperature of the anchor mortar and primary support similar materials to alter their macroscopic mechanical properties, thereby simulating the progressive degradation process of the primary support structure. This method can demonstrate the load transfer mechanism and bearing characteristic evolution of soft rock tunnel structures under progressive degradation conditions of the primary support structure. Furthermore, it can systematically analyze the influence of various factors, such as the anchor degradation rate, anchor degradation location, surface primary support degradation rate, surface primary support degradation location, surface primary support inner surface roughness (smooth, moderate, rough), and secondary lining mechanics, on surrounding rock deformation, support structure deformation, and stress.

In example embodiments, a component management service identifies related components using a combination of ML model geometry-based classification and text-based classification. The component management service accesses a plurality of components, wherein each component is associated with a geometry mesh and textual metadata. It classifies each component based on geometric similarity by providing the geometry mesh as input to one or more ML models. A geometry classification confidence score is produced for each classification. The component management service also classifies each component based on textual similarity by providing the textual metadata as input to the one or more ML models. A textual classification confidence score is produced for each classification. It calculates an overall confidence score for each classification by combining the geometry classification confidence score and the textual metadata classification confidence score. It displays components together that have an overall confidence score that exceeds a threshold for a same classification.

This invention discloses a scaled-down design method for the impact dynamic response of aircraft stiffened plate structures, belonging to the field of aircraft structural / strength testing technology. The method comprises the following steps: defining the load parameters and geometric parameters of the aircraft stiffened plate; calculating the relative stiffness of the stiffened plate; defining the basic geometric similarity ratio of the scaled-down model of the stiffened plate; determining the similarity ratio of the stiffened plate panel thickness; determining the similarity ratio of the width, height, and spacing of the stiffeners; obtaining the geometric dimensions of the scaled-down model of the stiffened plate; acquiring the dynamic response of the scaled-down model of the stiffened plate; and, based on the similarity ratio of the dynamic response, using the scaled-down model of the stiffened plate to predict the dynamic response of the prototype. This invention overcomes the practical difficulty of scaling down test specimens based on geometric similarity for thin-walled structures like aircraft stiffened plates, while simultaneously shortening the testing cycle and scale, and saving costs.

The invention relates to a BIM model linear component instantiation method and system and a medium, and the method comprises the following steps: traversing a linear component in a Revit file, extracting a cross section contour, and converting the cross section contour into a cross section contour vertex sequence; performing geometric similarity comparison on the vertex sequence of the section contour, and generating a standard geometry of unit length for each linear component group with the same section contour; performing singular value decomposition calculation according to the contour center and the baseline of the linear component and the standard geometry of unit length to obtain a contour transformation matrix and a baseline transformation matrix; combining the contour transformation matrix and the baseline transformation matrix into an instance restoration matrix, and restoring the standard geometry in unit length into the real position and attitude of the instance through the instance restoration matrix; and exporting the real position and attitude as instantiated data of the linear component. Compared with the prior art, the problem of information loss in a traditional conversion process is avoided, and the instantiation rate of the linear component is remarkably increased.

The invention discloses a representation method of a crystal structure, computer equipment and a storage medium, and relates to the technical field of computational materiation.The method comprises the steps that neighbor atoms corresponding to all atoms are determined according to the initial spatial positions of all the atoms extracted from an initial representation file, and then the atom pair distances between all the atoms and the neighbor atoms of all the atoms are determined; and carrying out dimension reduction processing on the initial spatial position of each atom by utilizing the distance of each atom pair, so as to obtain the target spatial position of each atom, thereby representing the crystal structure by utilizing the target spatial position of each atom, and generating the target representation of the crystal structure. According to the method, the dimension of the initial spatial position of each atom is reduced through the atom pair distance between each atom and the adjacent atom, so that the high-dimensional initial spatial position can be mapped into low-dimensional, continuous and comparable vector representation, and the geometric similarity and symmetry between crystal structures are kept; therefore, the problem that the effect of expressing the crystal structure is poor is solved.

The application discloses a model test method of a tunnel multilayer supporting structure, which comprises the following steps: determining the test nature, geometric similarity ratio, model box size and structure form of the model test; converting the geometric similarity ratio to determine the parameters of surrounding rock grade, anchor rod, spraying layer and secondary lining supporting material; designing the load of a jack, and determining the load application range; manufacturing a rough hole model body of a secondary lining-spraying layer-anchor rock bearing arch working condition; applying anchor rod similar material; applying spraying layer similar material; applying secondary lining similar material; loading in stages until the supporting is damaged; monitoring the stress and strain of surrounding rock and each supporting type, recording the stress data and strain data, obtaining the safety factor of each supporting and calculating the total safety factor. The application studies the supporting effect and bearing capacity of the tunnel multilayer supporting structure, calculates the total safety factor of the tunnel multilayer supporting structure, and promotes the development of a new generation of information technology.

This application discloses a method, equipment, medium, and product for constructing a physical model based on geomechanics, relating to the field of physical model testing. The method includes: determining a first geometric similarity ratio; determining a second geometric similarity ratio; establishing a dominant similarity law based on the first geometric similarity ratio to determine the baseline physical and mechanical parameters of the main material of the physical model; correcting the mechanical strength parameters of key structures based on the first and second geometric similarity ratios; constructing the main body of the physical model based on the baseline physical and mechanical parameters and the dimensions of the physical model, and constructing key structures based on the corrected mechanical strength parameters and actual fabrication dimensions; and integrating the constructed key structures with the main body of the constructed physical model based on the prototype geological body to be tested, obtaining the constructed physical model. This application can reflect macroscopic geological structures and reasonably characterize and control the mechanical effects of key structures within a limited physical model space.