11 results about "Geometric similarity" patented technology

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 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 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 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 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.