279 results about "Quadrilateral" patented technology

The invention discloses a hybrid Lp regularization magnetotelluric two-dimensional inversion method based on adaptive weight, and the method comprises the steps: reading magnetotelluric observation data, carrying out the quadrilateral finite element grid discretization of a whole inversion region, building an inversion grid, and building an initial model and a prior model of the inversion conductivity of the inversion region; based on the initial model and the prior model of the inversion conductivity and the magnetotelluric observation data, constructing a mixed Lp regularization inversion objective function comprising an L1 regularization item, an L2 regularization item and a data fitting item; in an inversion iteration process, adaptively adjusting weight factors of the L2 regularization item and the L1 regularization item; and based on the inversion grid, performing magnetotelluric two-dimensional inversion according to the inversion objective function mixed with Lp regularization, the initial model and magnetotelluric observation data, and outputting optimal model parameters of Gaussian Newton inversion to obtain underground electrical structure information. According to the invention, the resolution and accuracy of the inversion result are improved.

A method for identifying and calculating the volume of over- and under-excavation in tunnels based on laser point clouds belongs to the field of intelligent tunnel construction and blasting quality assessment technology. Technical solution: The scanned point cloud data is denoised; a design contour point cloud is generated and aligned with the centerline of the actual excavated tunnel; the actual collected tunnel excavation point cloud and the design contour point cloud are Delaunay tetrahedralized; the actual tunnel point cloud is traversed, and the vector dot product formed between the point cloud and the triangular sides of the convex hull is calculated; over- and under-excavation areas are identified; a polyhedron is constructed from the design contour point cloud and the actual excavated area point cloud constituting the area; the polyhedron is divided into quadrilaterals, and the volume of each quadrilateral is calculated, thereby calculating the volume of each over- and under-excavation area. Beneficial effects: This invention can quickly measure over- and under-excavation areas and quantities that are difficult to calculate in tunnel blasting quality assessment, and can replace cumbersome and time-consuming total station and manual measurement methods; this method has the advantages of high precision, high efficiency, and high flexibility.

The invention discloses a distributed urban and rural planning decision support method and system, and relates to the technical field of data analysis, and the method comprises the following steps: S100, drawing a planar graph of a to-be-planned region, dividing the planar graph of the region according to a Morse decomposition method, and constructing a region matrix, S200, calculating the coverage rate of the region matrix, and S300, calculating the coverage rate of the region matrix. And planning the surveying and mapping path. According to the method, planning units and surveying and mapping grids are unified into the same quadrilateral matrix through Morse complex, repeated zoning and edge matching errors are effectively avoided, the edge weight is inversely proportional to the building coverage rate, an unmanned aerial vehicle and a surveying and mapping vehicle automatically and preferentially encrypt a high built-up area, field working hours are saved, the data precision of a core construction area is guaranteed, and the construction efficiency is improved. The regional matrix naturally corresponds to edge nodes, and each node only communicates with an adjacent unit, so that the MST and the local route can be locally solved, the communication complexity is reduced, and the method is suitable for large-scale regional surveying and mapping.

The invention provides a negative poisson ratio tension metamaterial structure and application thereof in impact resistance of an unmanned aerial vehicle. The negative Poisson's ratio stretch-draw metamaterial structure is composed of a plurality of two-dimensional D-bar stretch-draw integral structures. The two-dimensional D-bar stretch-draw integral structure is composed of a plurality of two-dimensional D-bar stretch-draw unit structures. The two-dimensional D-bar tensioning unit structure is composed of four same rod pieces, four rigid hinges and two same elastic ropes. Wherein every two of four rod pieces of the two-dimensional D-bar tensioning unit structure are connected through a rigid hinge to form a quadrilateral structure, and the four rigid hinges are diagonally connected and fixed through two elastic ropes; and two elastic ropes are adopted for fixing. Compared with other stretch-draw metamaterial structures, the stretch-draw metamaterial based on the two-dimensional D-bar has the advantages that the negative Poisson's ratio structure can be utilized to show better energy absorption characteristics, and when the unmanned aerial vehicle collides or falls off, impact force can be effectively dispersed, and damage to an aircraft body is reduced.

Various aspects of a dimple pattern methodology, and dimple pattern configurations are disclosed herein. A spherical quadrilateral segment division can be used to maintain a high level of symmetry in the dimple pattern while also maintaining a specific dimple layout in polar regions of the golf ball. In one aspect, the specific configurations disclosed herein can provide geometric symmetry while being adaptable to relatively complex processes for forming golf ball covers. Furthermore, the configurations disclosed herein provide a dimple pattern with a high level of symmetry having a particular subset of preferred polar dimples.

The invention belongs to the technical field of engineering surveying, and particularly discloses a river-crossing leveling method and system.The method comprises the steps that four control points are arranged on the two sides of a water area to be measured, each control point is provided with a centering rod tool, and each centering rod tool is integrated with an upper-layer prism and a lower-layer prism with the preset fixed vertical distance; a first total station and a second total station are erected on the two banks of the water area, upper-layer prisms and lower-layer prisms arranged on centering rod tools on the opposite banks are observed synchronously and oppositely, and vertical angle and slant distance data of all observation targets are obtained; and based on the vertical angle and slope distance data, a preset fixed vertical distance is used as a checking condition, and the height difference between the target positions on the two banks is solved. According to the method, the double-layer prism tool is introduced into a physical forced closing check condition, and traditional quadrilateral geometric closing check is combined, so that the data redundancy and the reliability of results are greatly enhanced, and system errors can be effectively identified and separated.

Various aspects of a dimple pattern methodology, and dimple pattern configurations are disclosed herein. A spherical quadrilateral segment division can be used to maintain a high level of symmetry in the dimple pattern while also maintaining a specific dimple layout in polar regions of the golf ball. In one aspect, the specific configurations disclosed herein can provide geometric symmetry while being adaptable to relatively complex processes for forming golf ball covers. Furthermore, the configurations disclosed herein provide a dimple pattern with a high level of symmetry having a particular subset of preferred polar dimples.

This invention provides a rotation-aware enhanced variable window attention super-resolution method, belonging to the field of image processing technology. It includes acquiring and preprocessing the original remote sensing image of the target object, segmenting it into several basic windows, extracting feature vectors, using quadrilaterals to predict the basic parameters of the projective transformation matrix based on the extracted feature vectors to obtain the reconstructed projective transformation matrix, extracting the rotation angle difference between any two quadrilaterals as a rotation-aware term, establishing a variable window attention mechanism, embedding the variable window attention mechanism into a SwinIR network to build a high-precision super-resolution model architecture, training the high-precision super-resolution model, inputting real-time remote sensing images into the high-precision super-resolution model, and outputting a high-resolution image containing the target sampling area. By combining the variable window attention mechanism with the rotation-aware mechanism, the super-resolution reconstruction accuracy and geometric consistency of rotated objects are significantly improved while maintaining computational efficiency.

The invention belongs to the technical field of aircraft thin-wall structure design, and particularly relates to a method for correcting a quadrilateral shell unit in aircraft thin-wall structure finite element analysis, which comprises the following steps of: 1, establishing a unit coordinate system for the quadrilateral shell unit; step 2, under the unit coordinate system, establishing an equilibrium equation of a plane stress unit related to in-plane deformation, and calculating a rigidity matrix of the plane stress unit; step 3, under the unit coordinate system, establishing a balance equation of a bending plate unit related to out-of-plane deformation, and calculating a rigidity matrix of the bending plate unit; 4, applying an in-plane rotation penalty term on the rotational stiffness of the quadrilateral shell unit, and calculating the influence of the in-plane rotation penalty term on the strain energy function of the quadrilateral shell unit under the unit coordinate system to obtain an in-plane rotation stiffness matrix; 5, calculating a stiffness matrix of the quadrilateral shell unit under the unit coordinate system; and step 6, coordinate transformation is carried out to obtain a stiffness matrix of the quadrilateral shell unit under the overall coordinate system.

The invention provides a four-corner lock anomaly detection method based on key point detection, which comprises the following steps: firstly, acquiring a template graph and a task graph of a four-corner lock, acquiring image features and preprocessing, establishing a key point detection network, and determining the anomaly of the four-corner lock by positioning key points (rectangular vertexes, rectangular notch points and circular notch points) in the image and combining geometric vector calculation and angle judgment. Accurate recognition and anomaly detection of the closed state of the four-corner lock are achieved. According to the method, the rotationally symmetrical locking structures can be effectively distinguished, high detection accuracy can be kept under the complex illumination condition, the false detection and missing detection risks are greatly reduced, and the efficient, reliable and safe detection requirements of the subway inspection robot are met.

The invention discloses an ultrahigh-resolution immersive scene rendering method based on hexagonal picture segmentation. The method comprises the following steps: 1, determining a hexagonal segmentation style of an immersive display surface; 2, unfolding the immersive display surface into a plane; 3, acquiring 3D point information of each hexagonal surface, respectively calculating the width W and the height H of the enveloping quadrilateral surface, and calculating a local coordinate system V of the hexagonal surface S; 4, using W, H and V to construct a view cone and a viewpoint matrix of the three-dimensional scene; 5, setting a shade M of a plane expansion view for the hexagonal surface S; 6, calling a rendering scene of the 3D scene for the mask region by using information of the view cone and the viewpoint matrix, and rendering the mask region into a picture at the position S of the hexagonal surface; and 7, repeating the steps 5-6, and sequentially carrying out the same treatment on each hexagonal surface. According to the method and the device, the ultrahigh-resolution picture can be rendered in a scene segmentation form, and the method and the device are suitable for ultrahigh-resolution picture rendering under immersive display equipment.

The invention discloses an energy absorption enhancement type lattice structure with the Poisson's ratio adjustable in all directions and a design method, and relates to the field of honeycomb structures. The method comprises the steps that S1, two-dimensional honeycomb structure cell elements with the Poisson's ratio capable of being adjusted according to the thicknesses of inner and outer ribs are constructed; s2, overlapping the two two-dimensional honeycomb structure cell elements in the in-plane direction at 90 degrees, and performing Boolean union intersection operation to obtain four three-dimensional honeycomb units; s3, sequentially connecting the four middle vertexes of each three-dimensional honeycomb unit to form a quadrilateral rib, sequentially connecting the upper vertexes of the four three-dimensional honeycomb units to form a quadrilateral rib, and sequentially connecting the lower vertexes of the four three-dimensional honeycomb units to form a quadrilateral rib to obtain a three-dimensional honeycomb structure cell element; s4, performing array to obtain a three-dimensional lattice structure; when being pressed in the in-plane direction, the two-dimensional honeycomb structure cell element shows the same Poisson's ratio polarity as the corresponding two-dimensional honeycomb structure cell element in the in-plane direction. According to the constructed two-dimensional honeycomb structure cell elements, the overall rigidity of the structure is improved, and a novel three-dimensional lattice structure with Poisson's ratio symbol anisotropy is generated through Boolean operation.

The invention discloses a bulk cargo cabin real-time fusion detection method based on a laser point cloud, and the method comprises the steps: obtaining a real-time three-dimensional scene point cloud of a port scene, and obtaining a deck plane equation and a normal vector; projecting the three-dimensional scene point cloud to a two-dimensional deck plane, and constructing an intensity image taking point cloud intensity as information and a depth image taking projection distance as information; obtaining an intensity mask image from the intensity image; acquiring a depth edge image according to the depth image, and fusing the depth edge image and the intensity mask image to obtain a fused edge image; contour extraction is carried out on the fused edge image, polygon fitting is carried out, a quadrangle in the fused edge image is reserved as a candidate cabin, and a minimum enclosing rectangle of the quadrangle is obtained; and obtaining four vertex coordinates of the minimum bounding rectangle, and back-projecting the four vertex coordinates to the three-dimensional space to obtain three-dimensional space rectangular coordinate points of the final cabin. The method is suitable for a complex environment and a dynamic scene in a port operation area, and the cabin in the dynamic scene can be obtained in real time.

The embodiment of the invention provides a three-dimensional Gaussian sputtering scene rendering method and device based on an unreal engine. The method comprises the following steps: analyzing point cloud data of a three-dimensional Gaussian sputtering scene based on a graphics processor, and obtaining structured point cloud attribute data; mapping each Gaussian point in the point cloud attribute data into a quadrilateral instance, and determining a mapping result; according to the point cloud attribute data and a preset double-tone sorting algorithm, determining a sorting result of Gaussian point depths corresponding to the quadrilateral instance; according to the point cloud attribute data, the mapping result, the sorting result and a preset physical rendering model, processing the obtained light source data in the three-dimensional Gaussian sputtering scene, and determining an illumination calculation precision standard; and according to the distance between the preset camera and the point cloud data in the three-dimensional Gaussian sputtering scene, performing scene rendering by using the point cloud attribute data, the mapping result and the illumination calculation precision standard. According to the scheme, the engine compatibility problem is solved, and the rendering performance is optimized.

The application discloses a kind of poisson ratio each direction controllable energy-absorbing enhanced lattice structure and design method, it is related to honeycomb structure field, method includes: S1, constructs the poisson ratio of two-dimensional honeycomb structure cell that can be adjusted according to inner and outer rib thickness;S2, the in-plane direction of two two-dimensional honeycomb structure cell is mutually coincident and placed 90 degrees, carries out Boolean intersection operation, obtains four three-dimensional honeycomb units;S3, the four intermediate vertices of each three-dimensional honeycomb unit are sequentially connected into quadrilateral rib, the upper vertex of four three-dimensional honeycomb units is sequentially connected into quadrilateral rib, and its lower vertex is sequentially connected into quadrilateral rib, to obtain three-dimensional honeycomb structure cell;S4, array obtains three-dimensional lattice structure;When being compressed in in-plane direction, show the same poisson ratio polarity as the in-plane direction corresponding two-dimensional honeycomb structure cell.The two-dimensional honeycomb structure cell constructed by the application improves the overall stiffness of structure, and generates new three-dimensional lattice structure with poisson ratio sign anisotropy by Boolean operation.

The utility model discloses a double door leaf section bar of an elevator. The door leaf section bar comprises a section bar main body, viewing from the cross section angle of the profile body, the profile body comprises a first inclined plate, a second inclined plate, a first transverse plate and a second transverse plate. The first transverse plate and the second transverse plate are horizontally arranged, the second transverse plate is located under the first transverse plate, and the first inclined plate and the second inclined plate are located on the two sides of the first transverse plate respectively. The first inclined plate, the first transverse plate, the second inclined plate and the second transverse plate are sequentially connected and combined to form a quadrilateral structure, the designed structure of the profile body is firm, all the structures are arranged in the quadrilateral structure, risks such as breakage do not need to be worried about when the profile is installed and used, functions are complete, glass can be installed, and L-shaped corner connectors can also be installed. And the material has multiple purposes. And secondly, the first inclined plate and the second inclined plate adopt large inclined plane design, so that the appearance is elegant, and the stereoscopic impression is strong.

The application provides a flow control method based on three-curved-surface fish scale bionic structure, comprising the following steps: S1, constructing a main structure of an impeller blade, including a suction surface e and a pressure surface f, and fish scale areas g with multiple fish scale bionic structure coupling elements arranged regularly are arranged on the suction surface e and the pressure surface f; S2, constructing and designing a single fish scale bionic structure coupling element, including a bottom surface adhering to a blade surface, a top surface in a fish scale structure, and a rear side cylindrical surface; the top surface comprises two groups of parallel fold surfaces, and each group of fold surfaces is composed of three quadrilateral surfaces; a space rectangular coordinate system is established with a front end point of the bottom surface as an origin, and the fish scale bionic structure coupling element is constructed in the space rectangular coordinate system; and S3, establishing multiple fish scale bionic structure arrangement rules. The application can improve the fluid flow characteristics of the blade surface and reduce noise generation based on the control of flow by bionic structure.

The invention discloses a gradient acceleration optimization method for the wall thickness of a water-entry impact-resistant aluminum alloy honeycomb of an aircraft, and the method comprises the steps: selecting an optimal shape from aluminum alloy honeycombs of quadrilateral, hexagonal and circular honeycomb units, carrying out the axial layering, and generating a plurality of groups of honeycomb unit wall thickness gradient samples; constructing an optimal aluminum alloy honeycomb according to the wall thickness gradient samples of each group of honeycomb units, and constructing an aircraft fluid-solid coupling simulation model to perform impact response simulation at a preset water entry speed to obtain a real sample data set; and expanding a real sample data set, training and verifying a GAN-ANN proxy model, embedding the GAN-ANN proxy model into a multi-objective optimization model, and carrying out iterative solution by taking the peak acceleration and the mass minimization of the aluminum alloy honeycomb as objectives and meeting the peak stress constraint to obtain the optimal wall thickness of each layer of honeycomb unit. According to the optimized aluminum alloy honeycomb wall, the water entry impact load can be effectively relieved, the stress borne by the aircraft body is reduced, and the structural light weight can be achieved.

The utility model relates to the technical field of mechanical equipment fastening, in particular to a bolt anti-falling assembly which comprises a base plate and a matching component. A matching hole is formed in the substrate; the matching hole is a regular polygon hole; the matching component is thinner than the substrate; the outer wall of the matching component is of a polygonal structure, the number of edges of the outer wall of the matching component is the same as that of edges of the matching holes, and the matching component can be matched with the matching holes. The matching component can be mounted in the matching hole and is limited to rotate by the matching hole; a locking hole is formed in the matching component; the locking hole and the outer wall of the matching component are concentrically distributed; the locking hole is a regular hexagon hole or a regular quadrangle hole; a limiting hole is formed in the base plate; a preset distance is formed between the limiting hole and the matching hole; a plurality of limiting holes are provided; the multiple limiting holes are distributed in an array mode with the center of the matching hole as the circle center. The bolt or nut can be prevented from falling off, the bolt is convenient to replace, and the bolt can be repeatedly used, can be suitable for bolts of various specifications, and is simple in structure and low in use cost.

Video coding using warped motion compensation is described. Extended rotations for the warped motion compensation can be explicitly signaled. For example, motion parameters for predicting the current block and a rotation angle can be decoded. A warping matrix is obtained using the motion parameters and the rotation angle, and a prediction block is obtained by projecting the current block to a quadrilateral in a reference frame. Also described is determining a prediction model of the current block and obtaining a prediction block by projecting the current block to a quadrilateral in a reference frame. Determining the prediction model can include determining whether to predict the current block using a motion vector, a local warping model, or a global motion model, obtaining motion parameters of the prediction model, decoding a rotation angle, and obtaining a warping matrix using the motion parameters and the rotation angle.

This invention discloses a method for joint evaluation and optimization of buckling and bending of arbitrary quadrilateral laminates based on physical information neural networks, relating to the field of composite material structure design technology. The method, for arbitrary quadrilateral laminates, first constructs a method based on classical laminate theory... USA The stiffness matrix explicitly reflects the influence of ply parameters, and a physical domain is transformed to a reference domain through a bitriangular affine mapping to establish a physical information neural network mechanical model. The model is trained with the goal of minimizing the total potential energy or Rayleigh quotient, solving for the buckling factor and layer-by-layer strain limits, and adapting to four typical boundary conditions through a boundary embedding function. Subsequently, using ply angle and thickness as variables, optimization is performed using a genetic algorithm, with the goal of minimizing mass, and the buckling factor and strain limits as constraints. The final output is the optimal ply scheme that satisfies specific boundary conditions. This invention can optimize ply angle and thickness while satisfying buckling stability and strain strength constraints.

The invention discloses an article grabbing and positioning method, system and device and a medium, and relates to the technical field of visual recognition. The method comprises the steps that a two-dimensional image, collected through a monocular camera, of an object to be grabbed is acquired; the types and the number of the to-be-grabbed articles in the two-dimensional image are recognized, and standard physical sizes corresponding to the types are determined; if the object is a single object, the object serves as a target to-be-grabbed object, the top face corner pixel coordinates of the object are detected, and the three-dimensional pose is solved through the PnP algorithm by combining the physical size and the internal reference of the monocular camera; if the number of the objects is multiple, all candidate corner points are detected, quadrilateral corner point sets of all the objects are screened out through clustering and geometric constraint analysis, then candidate three-dimensional poses of all candidate objects to be grabbed are calculated through a PnP algorithm, and then a target object to be grabbed is selected according to the candidate three-dimensional poses; and finally outputting the three-dimensional pose information of the target to-be-grabbed object. According to the invention, accurate positioning of a single article and three-dimensional pose recognition in a multi-article stacking scene are realized only by means of the monocular camera.

The application provides a kind of visual quality inspection and machining precision closed-loop control method and system of intelligent manufacturing unit, specifically collect the image of workpiece to be inspected, obtain initial target frame by target detection network, segment workpiece image to obtain pixel mask and contour, calculate the minimum area of contour as size reference frame as circumscribed quadrilateral;Based on the matching relationship between the actual feature points in the reference frame and the preset template, calculate the homography matrix to correct the perspective distortion, get the corrected contour and the standard size frame;Sample along the normal direction of each side of the standard size frame to get edge point set, fit high-precision edge with random sampling consistency algorithm and calculate the proportion of in-point, if the proportion does not meet the standard, increase the sampling density and re-fit, compare the fitted workpiece size with the planned size, and construct the machining deviation state matrix;Combine historical deviation matrix and compensation parameters to update the transfer matrix of machining process online, generate compensation parameters through current deviation matrix and send to unit controller.

This application relates to a method for locating multiple types of screens in a visual image. The method includes: identifying images S using the Mask R-CNN instance segmentation algorithm. input The device is located in a specific area. This area is processed to ensure that the image of the area contains the entire device screen. Finally, an image S containing the entire device screen is cropped out. rough For image S rough Multiple candidate screen contours are identified through edge detection. Based on the screen shape features, a heuristic method is used to fit polygons to all candidate contours. The candidate contours are then sorted in descending order of their fit with the fitted polygons. Based on the sorted candidate contours, the shape category of the device screen is determined, and different localization algorithms are used to locate the screen region. The coordinates of the four vertices of the screen are obtained, and the quadrilateral region formed by these four vertices is used as the final identified and located device screen region. This improves the accuracy of identifying the screen region in an image.

A method of manufacture of a fibre-based packaging container, wherein the method comprises the steps of: a) providing a quadrilateral blank comprising an inner wall surface and an outer wall surface opposing the inner wall surface, the inner wall surface comprising a liquid impermeable layer, the quadrilateral blank further comprising a first edge and second edge opposing the first edge, wherein the first and second edges are linear, and a third edge and a fourth edge opposing the third edge, each of the third and fourth edges defining an arc, wherein a first edge sealing portion extends partially across the inner wall surface from the first edge and a second edge sealing portion extends partially across the outer wall surface from the second edge, and wherein a base sealing portion extends partially across the inner wall surface adjacent the third edge; b) providing a circular base component having an outer edge, an inner base surface and an outer base surface opposing the inner base surface, the inner base surface having a liquid impermeable layer and comprising a wall sealing portion; c) flexing the quadrilateral blank to bring the first and second edges into overlapped engagement with one another, and sealing them to one another to form a tubular wall component with a wall seam, the tubular wall component having an interior, an exterior, an upper end and a lower end at which the base sealing portion is located; d) folding the circular base component at a fold line around the whole of the circular base component to create a circumferentially folded edge extending at 80 to 100 degrees from the rest of the circular base component wherein the circumferentially folded edge comprises the wall sealing portion, and the circumferentially folded edge and the outer base surface define a base interior; and e) sealing the wall sealing portion and the base sealing portion to one another to form a base seam between the tubular wall component and the circular base component; wherein 1) one or more of the second, third or fourth edges of the quadrilateral blank comprise a liquid impermeable layer and / or a sealable lacquer coating; 2) the process further comprises the step of rolling the fourth edqe of the quadrilateral blank or the upper edge of the tubular wall component to form a rolled rim and applying a sealable lacquer coating and / or a second liquid impermeable layer to the rolled rim; 3) the process further comprises the step of applying a sealable lacquer coating and / or a further liquid impermeable layer to the interior of the tubular wall component and / or the inner base surface; and / or 4) a portion of the inner wall surface and / or the outer wall surface extending partially along that surface from the fourth edge of the quadrilateral blank or the upper edge of the tubular wall component comprises an additional layer of liquid impermeable barrier material and / or sealable lacquer.

The present application relates to a text classification method, apparatus and computer equipment based on a confusion matrix. First, a confusion matrix of a candidate classification algorithm before being attacked is obtained. Based on the confusion matrix, the centroid between correct and incorrect predictions based on the same true label is introduced. Then, a centroid offset quadrilateral is formed, and the total area of ​​the centroid offset quadrilateral in the confusion matrix before being attacked is calculated. Then, an attack algorithm is used to attack each candidate classification algorithm, and a confusion matrix of the candidate classification algorithm after being attacked is obtained. Similarly, a centroid offset quadrilateral is constructed. By using this method, the difference in the total area of ​​the centroid offset quadrilateral before and after being attacked can be calculated to intuitively see the difference in the robustness of the candidate classification algorithm. The classification algorithm with the best robustness can be scientifically and quickly screened for text classification, thereby ensuring the stability of the text classification effect.

The utility model discloses a high -strength balance anti -vibration movable chassis, including four corner connecting pieces and two cross beams and two longitudinal beams, two cross beams and two longitudinal beams combination form a quadrilateral frame type structure, four corner connecting pieces respectively one one -to -one corresponding detachable setting in four corners of quadrilateral frame type structure, corner connecting piece is configured as in same plane, fixes with one longitudinal beam end portion to one cross beam end portion, to make two cross beams and two longitudinal beams head -to -tail connection, in the utility model, four corner connecting pieces respectively one one -to -one corresponding detachable setting in four corners of quadrilateral frame type structure, therefore, two cross beams and two longitudinal beams can freely dismouting, once some beam appears the cracking phenomenon, only needs corresponding replacement cracking cross beam and / or longitudinal beam.

This invention belongs to the field of building construction technology, and particularly relates to a formwork and construction method for torsion concrete columns that can rotate at any angle in large venues. It includes: a central shaft for support; multiple frame components arranged vertically, each frame component comprising four telescopic mechanisms; the central shaft being located inside the frame components; and the four telescopic mechanisms connected end-to-end to form a quadrilateral structure; a linkage shaft connecting the telescopic mechanisms and the central shaft, one end of which is rotatably connected to a telescopic mechanism; and a protrusion ring corresponding to the frame component fitted onto the surface of the central shaft. This invention uses multiple telescopic mechanisms, the lengths of which combine to form the shape of the quadrilateral frame component. The shape of the frame component can be adjusted by adjusting the lengths of the telescopic mechanisms as needed. The telescopic structure can adapt to irregularly shaped torsion concrete components at any angle, thus eliminating the need for custom-made formwork of fixed sizes.

The utility model discloses a kind of flexible overturning pre-grouping tool, including bottom frame, stand, second crossbeam, second longitudinal beam, overturning device, bottom frame is quadrilateral, including two parallel first crossbeam and two parallel first longitudinal beam, bottom frame is provided with supporting device;Two first longitudinal beam of bottom frame are respectively connected with stand, two second longitudinal beams are respectively arranged at the top of two side stands, second longitudinal beam is parallel with the first longitudinal beam of bottom frame;Two second crossbeams are parallel with first crossbeam and are arranged, two second crossbeams are detachably connected on two second longitudinal beams;Overturning device is respectively connected outside two side stands, and can rotate the above-mentioned structure as a whole.And the first crossbeam of bottom frame can be axially moved relative to first longitudinal beam and is fixed after moving in place by limiting device, so as to adjust the size of bottom frame, adapt to high-voltage equipment box of different size, its structure is simple, convenient to operate, and strong adaptability.

The application discloses a mirror quick correction method and system, which comprises the following steps: setting a closed quadrilateral figure; laser is scanned along four edges of the quadrilateral figure under the action of a mirror system to form an actual marking figure; the quadrilateral figure and the actual marking figure are superposed to an XY two-dimensional coordinate system; compensation amounts in X and Y directions are obtained; input processing point coordinates are compensated according to the compensation amounts, and the mirror system moves to a predetermined position according to the compensation result, so that the laser spot finally falls on the desired position on the working surface. The application is simple and easy to operate, has small detection error, high correction precision and low use cost.