68 results about "Surface element" patented technology

The invention relates to the technical field of geotechnical engineering, in particular to a rock joint surface roughness measuring method and system. The method comprises the steps of firstly obtaining a triangular mesh of a rock surface; further based on the spatial distribution of the unit external normal vector in the global coordinate system, carrying out shielding detection on the local surface elements along a shearing reverse direction, and screening out potential contact surface elements; further analyzing each potential contact surface element in the global coordinate system, and calculating frictional sliding work in combination with preset working condition parameters; the rock mass supporting thickness is further obtained, and root cutting work is calculated in combination with preset working condition parameters and the projection area of the shear plane; root cutting work and friction sliding work are further compared, an energy consumption mode is marked, a shear energy consumption digraph is constructed, and equivalent shear resistance roughness is calculated, so that the problem that thin ridge bulges which are easy to cut off are counted into the roughness by mistake under high stress in a traditional method is solved, and stress-sensitive effective roughness measurement is realized.

The application discloses a high angle of attack nonlinear separated flow aerodynamic force correction method, which comprises the following steps: obtaining aircraft surface pressure distribution data at zero reduced frequency by using a DES method; dividing surface elements on the surface area of the aircraft, and generating an AIC matrix AIC by using a dipole grid method based on the geometric information of each surface element; obtaining the aerodynamic force and moment of each surface element according to the AIC, and generating an aerodynamic force matrix A DLM,k＝0 of all surface elements at zero reduced frequency by using the aerodynamic force and moment of each surface element; interpolating the aircraft surface pressure distribution data obtained by using the DES method to each surface element to obtain the aerodynamic force matrix A DES of all surface elements; obtaining a force correction matrix W according to A DLM,k＝0 and A DES ; correcting the AIC matrix AIC by using the force correction matrix W to obtain a corrected aerodynamic force influence coefficient matrix AIC * ; and performing aerodynamic force correction and aeroelastic calculation by using the corrected aerodynamic force influence coefficient matrix AIC * , so as to complete the high angle of attack nonlinear separated flow aerodynamic force correction. The application can have both the calculation precision of CFD and the calculation efficiency of an engineering method.

This invention discloses a method, system, medium, and device for determining the reference pH value for acid etching to regulate the surface state of a material. The method includes: first, acquiring a test electrode containing the material to be treated; measuring the change in electrode resistance with temperature within a preset environmental condition and temperature range to obtain the resistance-temperature relationship; performing linear fitting on this relationship to determine a fitted straight line; and obtaining the material's conductivity activation energy based on the slope of the fitted straight line; determining the chemical bonds that preferentially break in the acid etching environment and the charge transfer number during the breaking process, based on the material's crystal structure and chemical bond characteristics; and finally, calculating the theoretical reference pH value for acid etching based on the conductivity activation energy and charge transfer number. Acid etching based on this reference pH value can effectively adjust the surface morphology and surface elemental composition of the material while ensuring the stability of the main material structure, significantly improving the consistency and reliability of the acid etching effect, and solving the problem of relying on experience to select the pH value in traditional processes.

An image-processing device generates a three-dimensional model of a background scene of the image frame based on three-dimensional information about the background scene. The image-processing device defines a three-dimensional bounding box of the object in the three-dimensional model. The image-processing device defines a centre coordinate in the three-dimensional model and a colour value of surface elements of the three-dimensional bounding box. The image-processing device determines a three-dimensional coordinate of a surface in the three-dimensional model which reflects light from a surface element into the camera, by tracing rays from the centre coordinate and based on a normal of the surface. The image-processing device further identifies a first pixel in the image frame corresponding to the three-dimensional coordinate and detects the reflection of the object.

The application discloses a fast and accurate mutual coupling electromagnetic scattering area distinguishing method, belongs to the technical field of electromagnetic scattering characteristic calculation, determines the maximum boundary of the whole ship target, and decomposes the target into a plurality of local solid closed boundaries, positions each surface element, determines the array space to which each surface element belongs, and generates an incident ray tube for the directly visible surface element of the target, and all the ray tubes have triangular cross sections; the array space in which the surface element exists multiple scattering relationship with the reflection ray tracing of the first surface element is utilized to lock the search in the corresponding array space after decomposition; the surface element capable of generating multiple scattering with the first surface element is screened, and the improved Z-Buffer algorithm suitable for electromagnetic scattering calculation is adopted to perform shielding discrimination, so as to exclude two visible surface elements shielded by the intermediate surface element. The application greatly improves the calculation efficiency on the basis of ensuring the precision through adaptive ray tube division.

The invention relates to a gap seal (10) for sealing a gap between a movable platform (64) and a frame (66) of a loading bridge (12), comprising a sealing profile (14) formed from at least one elongated, strip-shaped, reversibly deformable surface element (18). To improve the gap seal in terms of ease of manufacture and durability, the surface element (18) is formed into a loop (20) such that a first strip-shaped surface area (22) and a second strip-shaped surface area (24), located on the same side of the surface element (18) and spaced apart from each other, are attached to one another in a direction towards each other.As a result, a first longitudinal edge area (26) of the sealing profile (14) is formed as a thinner fastening area (28) relative to the loop (20), while on the second longitudinal edge area (32) of the sealing profile (14) the thicker loop (20) is formed relative to the fastening area (28), which elastically deforms accordingly in the gap (62) to create a seal.

This invention discloses a numerical inversion method for nonlinear stress fields, comprising: selecting a study area and constructing a three-dimensional geological model; discretizing the boundary surface of the three-dimensional geological model into multiple surface elements, assigning a nonlinear variation coefficient to each surface element to generate the nonlinear variation coefficient of the model boundary surface; determining the stress components with significant influence on the study area based on measured geostress values ​​as linear boundary conditions applied to the model; adjusting the nonlinear coefficients of the linear boundary conditions to obtain nonlinear boundary conditions; determining the calculated stress component values ​​at measured points under preset working conditions based on the nonlinear boundary conditions; determining the regression coefficients for each preset working condition using the principle of linear superposition and the least squares method based on the measured and calculated stress component values; and generating a nonlinear geostress field based on the nonlinear boundary conditions and regression coefficients and a numerical calculation model. This method achieves the loading of nonlinear stress boundaries, thereby determining the optimal nonlinear geostress field.

The present application relates to a kind of acoustic radiation fast estimation method of fluid domain structure, belong to acoustic radiation estimation technical field, wherein, the method includes: establishing structure model;Structure model includes the coupling surface of structure and fluid domain, coupling surface includes multiple first surface elements, and first surface element includes structure node;Establish fluid domain model;Fluid domain model also includes above-mentioned coupling surface;The coupling surface of fluid domain model includes the second surface element corresponding to first surface element;First pulsating pressure information on second surface element is obtained by fluid dynamics simulation;Second pulsating pressure information of each structure node is obtained by mapping first pulsating pressure information on second surface element to the structure node on the first surface element corresponding to second surface element by neural network model, by neural network model to the structure node on the first surface element corresponding to second surface element;Second pulsating pressure information is used to determine the acoustic radiation of structure.The present application improves the estimation efficiency and the convergence of calculation of the acoustic radiation of structure with fluid domain.

This invention discloses a method for inverting spatial thermal radiation data based on micro-surface element theory, comprising the following steps: S1, acquiring BRDF data from multiple angles, and simultaneously acquiring measured directional emissivity data of the target rough surface; obtaining initial data; S2, fitting the initial data from S1 to the initial physical emissivity model based on micro-surface element theory; S3, applying the measured directional emissivity data of the target rough surface to the initial physical emissivity model for fitting. If the model does not meet the standard, the model parameters are automatically adjusted using optimization algorithms such as backpropagation, and iterative fitting is performed until the error meets a preset threshold; if the standard is met, the current model parameter set and structure are locked. This invention offers high precision and strong physicality; by using a small amount of measured emissivity data to correct and fine-tune the model, high-precision target emissivity information can be quickly obtained under different roughness conditions.

The invention provides a semiconductor three-dimensional process air grid reconstruction method, device and equipment and a medium, and relates to the technical field of semiconductor simulation, and the method comprises the steps: recognizing exposed surface elements of an air region based on a geometric topological structure of an original simulation grid; constructing a closed air volume boundary according to the boundary information of the exposed surface element and the generated air area height; and performing tetrahedral mesh generation on the air volume boundary, and sewing a division result to the original simulation mesh to obtain a conformal reconstruction result which is used for realizing automatic generation and conformal reconstruction of the air mesh in three-dimensional semiconductor process simulation.

The invention discloses a method and a device for calculating patch observation system surface elements and coverage times, electronic equipment and a medium. The method comprises the following steps: calculating the longitudinal surface element size of the patch observation system; calculating the transverse surface element size of the patch observation system; calculating the longitudinal coverage frequency of the patch observation system; and calculating the transverse coverage frequency of the patch observation system. According to the method, the surface elements and the coverage times of different types of patch observation systems are calculated, so that the problem of accurate calculation of the surface elements and the coverage times in key acquisition parameters when the target OBN acquisition patch observation system is designed is solved, and the working efficiency of geophysical prospecting engineering professionals during seismic observation system design and acquisition design is improved; the construction efficiency of seismic exploration is further improved, and the exploration cost is reduced.

The invention relates to the technical field of grid processing, and provides a grid Boolean operation method and device, electronic equipment and a storage medium, and the method comprises the steps: obtaining an intersection line between a triangular surface element of a level set curved surface and a triangular surface element of an etching volume boundary curved surface; for each triangular surface element containing the intersecting line, segmenting the triangular surface element based on the intersecting line; dividing the divided triangular surface elements and the triangular surface elements not containing the intersecting lines into a plurality of independent areas according to spatial positions; and based on the intersecting lines, combining the independent areas of which the spatial positions are the etching reserved areas to obtain a grid Boolean operation result. According to the method, the intersecting lines penetrate through the whole operation process, targeted adaptation of open-closed curved surface combination is achieved, the design limitation of traditional grid Boolean operation is eliminated, and it is ensured that each detail of the etching boundary can be accurately expressed through accurate linkage of segmentation, partitioning and combination.

The invention provides a seismic data filtering method and device based on kernel principal component analysis and a medium, and belongs to the field of seismic data processing. The method comprises the following steps: extracting a trend time difference attribute of an input three-dimensional seismic data volume; setting a surface element size and extracting a corresponding line data volume according to the surface element size; selecting a target point and calculating surface element coordinates according to the trend time difference data; setting the size of a time window and extracting a small three-dimensional data volume in combination with surface element coordinates; and performing kernel principal component analysis on the small three-dimensional data volume to obtain a first principal component, and taking central point data of the first principal component as filtered data of the target point. According to the method, original data are mapped into a high-dimensional space through nonlinear mapping by adopting kernel principal component analysis, so that nonlinear structures and characteristics in the original data can be better reserved; in addition, the trend time difference attribute of seismic data is also considered, geologic structure data can be more accurately obtained by opening up a time window along the event trend, the problem of data discontinuity caused by the influence of stratum inclination is improved, and the filtering effect is improved.

Seat (100), in particular vehicle seat, comprising a seat element (101) and a backrest element (102), wherein the backrest element (102) is connected to the seat element (101), wherein at least one surface element (1) is arranged on or in a surface of the backrest element (102), wherein the surface element (1) comprises a first mirror (11), a second mirror (12) and a frame (13), wherein the frame (13) connects the first mirror (11) with the second mirror (12) and there is a space between the first mirror (11) and the second mirror (12), wherein a reflective surface of the first mirror (11) is oriented towards the second mirror (12) and a reflective surface of the second mirror (12) is oriented towards the first mirror (11), wherein the reflective surface of the second mirror (12) or the reflective surface of the second mirror (12) and the reflective surface of the first mirror (11) are semi-transparent, wherein the surface element (1) comprises at least one depth-effect element (14) which is arranged between the first mirror (11) and the second mirror (12) such that it is visible to an observer through at least the second mirror (12) and the surface element (1) comprises at least one attachment element (15) which is connected to the first mirror (11), the second mirror (12) and / or the frame (13), wherein the attachment element (15) is further connected to a surface of the backrest element (102) or to an element inside the backrest element (102).

An optically variable surface pattern which is designed to provide a multi-color representation when viewed from at least one predefined viewing angle and includes a multiplicity of surface elements which are provided with relief structures, at least one of the relief structures having nanostructures that act as color filters. The relief structures are selected from a set of at least four relief structures that differ from one another, each of which generating a color impression corresponding to a predefined monochromatic color when viewed from the predefined viewing angle, and each of the monochromatic colors corresponding to a different basic color. The surface elements are dimensioned such that, in at least one subregion of the surface pattern, when viewed from the at least one predefined viewing angle, a color impression corresponding to a mixed color that differs from the predefined basic colors can be generated.

This application relates to a global lighting rendering method performed by a computer device. The method includes: generating a plurality of surface elements of an object in a virtual scene; determining, from the plurality of surface elements of the object, a target surface element whose distance to a light probe in the virtual scene satisfies a preset condition; obtaining surface element lighting information of the target surface element, the surface element lighting information including direct lighting information and indirect lighting information, and the indirect lighting information being obtained by lighting accumulation of projected light from the target surface element; and performing global lighting rendering on the object in the virtual scene based on the surface element lighting information.

The present application relates to the field of optical imaging technology, and particularly relates to a non-distortion compact off-axis near-eye display optical system, which comprises a display, a first free curved surface element, a second free curved surface element, and a first sub-light path and a second sub-light path formed by the first free curved surface element and the second free curved surface element; one side of the top of the first free curved surface element is provided with a first light-in curve, a light-out curve is arranged below the light-in curve, and a first reflection curve and a second reflection curve are sequentially arranged from top to bottom on the side of the first free curved surface element away from the first light-in curve; one side of the second free curved surface element is provided with a fitting curve matched with the second reflection curve, and a second light-in curve is arranged on the side away from the fitting curve; the display corresponds to the first light-in curve. The present application has the characteristics of compact structure, small volume of optical parts, and high definition.

The invention provides a TDPO method based on surface element-observation point two-stage GPU parallel acceleration, and relates to the technical field of electromagnetic simulation. The method comprises the following steps that electromagnetic simulation basic parameters are configured, a triangular mesh model file of a target object is imported, and the surface of a triangular mesh model is divided into an illuminated area and a shadow area through the ray shielding judgment technology; the CPU performs serial calculation based on the electromagnetic simulation basic parameters to generate array data and transmits the array data to the GPU; based on the array data, the GPU executes two-stage parallel calculation of the surface element and the observation point to obtain a scattering contribution component; the scattering contribution components are transmitted back to the CPU and accumulated, and the scattering electromagnetic field of each observation point is output. According to the TDPO method based on surface element-observation point two-stage GPU parallel acceleration, the calculation precision and the calculation precision in complex electromagnetic scattering analysis are remarkably improved.

The invention discloses a method for identifying features of an arc with an irregular shape in a three-dimensional model. The method comprises the following steps: S1, determining a three-dimensional entity feature model; s2, obtaining each outer surface of the three-dimensional entity feature model; s3, extracting an outer surface element domain; s4, dispersing the line elements according to given control parameters; s5, performing UV two-direction parameterization processing on the surface elements; s6, performing isoparametric curve solving on the UV directions of the surface elements to obtain two clusters of isoparametric curves; step S7, measuring each cluster of isoparametric curve in the UV direction; step S8, if any cluster of isoparametric curves of U or V are all arc lines, finally obtaining required arc features; otherwise, returning to the step S3. The method has the advantages that technologies such as topological decomposition, equal-chord-height discretization and parameterization processing of surface elements are comprehensively utilized, and automatic identification of irregular shape arc features is achieved.

A system and method for encoding a user-defined view of an anatomical structure in an anatomical model. A predefined anatomical model of an anatomical structure is obtained, and a user input indicating a desired view of the anatomical structure is received. A subset of surface elements of the predefined anatomical model defining a plane of the anatomical structure corresponding to the desired view of the anatomical structure is identified, and an association between the subset of surface elements and the desired view of the anatomical structure is encoded into the predefined anatomical model.

A method of making a plain bearing includes providing an outer sliding-surface element and an inner sliding-surface element enclosed by the outer sliding-surface element. The outer sliding-surface element is divided along a substantially flat surface that includes the main axis of the sliding bearing and has, at least at one axial end, a radially encircling groove. An open ring having two circumferential ends is provided to fixedly hold together the divided outer sliding-surface element, the open ring being wrapped around the groove and its circumferential ends connected together to form a closed solid ring.

Embodiments of the present application provide a shot point OVT domain uniformity evaluation method and device, computer equipment and a storage medium, the method comprising: taking a CMP surface element point closest to a middle shot point of a target work area as a center, and performing OVT grid division on a shot domain of the target work area; counting the number of shot points in the OVT grid of the shot domain, and performing OVT domain uniformity evaluation on the shot points of the target work area according to the number of shot points in the OVT grid of the shot domain, which can quickly evaluate the uniformity of field shot points, thereby guiding the uniform arrangement of shot points, while meeting the requirements of OVT domain pre-stack migration processing.

The invention provides a point-surface contact modeling method and device based on near-field dynamic contact force, and the method comprises the steps: building a PD particle model based on a finite element mesh model of a target object; constructing a contact neighbor list of the particle set; generating a surface element contact list according to the contact neighbor list; identifying free surface particles, determining unit surfaces associated with the free surface particles, and obtaining a free surface and surface normal information; performing contact judgment on the target particles in the surface element contact list and the target element surface, and when contact is judged to occur, determining the penetration depth; according to the penetration depth and the surface normal information corresponding to the target unit surface, the contact force is calculated; and introducing the contact force into the near-field kinetic equation, updating the motion state of the particles, and returning to the step of constructing the dynamically updated contact neighbor list corresponding to the particle set until the preset calculation termination condition is met, so that the accuracy, stability and calculation efficiency of PD contact model modeling are improved.

The invention discloses a super-smooth polishing method for a large-diameter complex curved surface NiP composite material reflecting mirror. The method comprises the steps that a large-diameter complex curved surface element polishing path is planned; the high-speed rough polishing stage is used for removing turning tool marks; a fine polishing stage with nanoscale roughness; an ultra-smooth polishing stage of performing atomic-scale removal to obtain sub-nanometer roughness; and a multi-stage progressive cleaning stage ensures high-standard smoothness. According to the method, dynamic path optimization and polishing process optimization are conducted on robot polishing equipment, the complex interactive machining problem of the four dimensions of nickel-phosphorus alloy material characteristics, large-diameter high-gradient complex curved surfaces, ultra-smooth machining and composite metal material smoothness is solved, only the robot polishing equipment is used in the machining process, and the machining efficiency is improved. The device has the outstanding advantages of high efficiency, good stability, high processing quality, low cost and the like.

This invention provides a method and system for evaluating observation systems, belonging to the field of three-dimensional seismic acquisition and observation systems. The method evaluates the observation system based on the coverage number, offset, and azimuth of the target stratigraphic unit. The method includes: Step 1: collecting and organizing the coverage number at different offsets and azimuths on sub-regions or surface elements of all observation systems; Step 2: calculating the similarity distance or similarity coefficient of the observation systems; Step 3: analyzing and evaluating the observation systems. This invention achieves multi-parameter and multi-dimensional evaluation of the observation system from multiple parameters such as the coverage number, offset, and azimuth, meeting the requirements for comprehensive quantitative evaluation of the observation system in seismic acquisition design, conforming to field practice, and applicable to both field production and theoretical research.

The application provides a three-dimensional mesh generation method based on patch autoregressive compression and an electronic device. The three-dimensional mesh generation method based on patch autoregressive compression comprises the following steps: converting an input three-dimensional shape representation into an ordered triangular patch sequence, wherein each triangular patch is defined by the coordinates of its three vertices; using a shape encoder to encode the input three-dimensional shape representation into a latent representation; using an autoregressive decoder to generate each triangular patch in the ordered triangular patch sequence one by one in sequence, with the latent representation as a condition, thereby generating a three-dimensional mesh. By representing a three-dimensional mesh as an ordered patch sequence and performing autoregressive generation, the modeling granularity is improved from the bottom vertex coordinates to the high-level triangular patch. The model can directly learn and generate the topological structure of the mesh, significantly improving the ability to capture the geometric structure and topological relationship of the mesh, thereby achieving the purpose of improving the generation quality and efficiency.

The present application relates to the technical field of geotechnical engineering, in particular to a rock joint roughness measurement method and system. The present application first acquires a triangular mesh of the rock surface; further based on the spatial distribution of the unit outer normal vector in the global coordinate system, and shielding detection is carried out on the local surface element along the shear reverse direction, and the potential contact surface element is screened out; further analyzing each potential contact surface element in the global coordinate system, combining the preset working condition parameters to calculate the friction sliding work; further acquiring the rock mass support thickness, and combining the preset working condition parameters and the shear surface projection area to calculate the root truncation work; further comparing the root truncation work and the friction sliding work, marking the energy consumption mode and constructing the shear energy consumption directed graph, calculating the equivalent shear roughness, solving the problem that the traditional method mistakenly counts the thin ridge protrusions prone to shearing into the roughness under high stress, realizing the stress-sensitive effective roughness measurement.

The invention provides a layout method and a layout device for a large-scale seismic exploration observation system. The layout method for the large-scale seismic exploration observation system comprises the following steps: step 1, setting template parameters of the seismic exploration observation system; 2, generating a seismic exploration and observation system template according to the set seismic exploration and observation system template parameters; step 3, calculating the coverage range of model surface elements of the seismic exploration and observation system; step 4, analyzing and calculating surface element coverage characteristics according to the surface element coverage range and the type and quantity thereof; and step 5, generating a relative starting point set of all templates and all data of the observation system according to the layout parameters of the seismic exploration observation system. According to the layout method and layout device of the large-scale seismic exploration observation system, preprocessing is carried out through the observation system template, the graphic features covered by the template surface elements are constructed in combination with the layout parameters, and the layout processing speed of the observation system is remarkably improved.

This invention relates to the field of high-frequency electromagnetic calculation technology using physical optics, specifically to a method for reverse ray tracing in preprocessing of surface elements. When reading the triangular mesh information of the model, this invention calculates the normal vector, center coordinates, and axial bounding box (AABB) of each triangular surface element. Triangular surface elements whose dot product of the normal vector and the plane wave incident direction is less than 0 are designated as potential illuminated surfaces and included in the potential illuminated area set. Then, a secondary illumination judgment is performed on the triangular surface elements in each potential illuminated area to obtain the final set of effective illuminated surfaces. Finally, the scattering contributions of each effective illuminated surface element are summed to obtain the total scattering field of the target, and the radar cross section (RCS) is then calculated. This invention systematically solves the core contradictions of existing technologies—insufficient accuracy of the normal vector dot product, two-dimensional approximation of projection clipping, and low efficiency of traditional reverse ray tracing—through an integrated design; it provides a novel technical solution for the electromagnetic scattering characteristics analysis of electrically large targets.