57 results about "Diagonal" patented technology

In an energy absorbing member (10), a basic unit (20) with a U-shaped cross-section comprising a press-molded article is formed by a first sheet section (41) and a pair of second sheet sections (42, 42). An inner surface (21) and an outer surface (22) of the basic unit (20) that has been configured having the U-shaped cross section are contours that do not have an undercut shape in a direction along a reference line (CL2). The first sheet section (41) and the pair of second sheet sections (42, 42) have imaginary parallelograms (90) that extend from a first end surface (51) to a second end surface (52) of the basic unit (20) and are respectively deviated around an axis (CL1). At least one of two diagonals (91, 92) of each imaginary parallelogram (90) is formed by a fold line.

To determine a projection area of an image on a projection surface so as to effectively use a drawing area of a panel of a projector.SOLUTION: A determining method of a projection area PAR, includes steps of: specifying coordinates of four vertices P10s, P11s, P12s, and P13s, which correspond one-to-one to four vertices P10p, P11p, P12p, and P13p of a rectangle RE10p defining a drawing area DAR1 in a panel PL, in a screen coordinate system ΣS of a projection surface SC; identifying a first intersection point coordinate which is a coordinate in the screen coordinate system ΣS of a first intersection point PI1s at which two diagonal lines of a quadrangle QU10s having vertices P10s, P11s, P12s, and P13s as vertices intersect with each other; identifying a largest rectangle which falls within a range of the quadrangle QU10s and has a first aspect ratio centered on the first intersection point coordinate as a first rectangle RE1s; and determining a projection area PAR on the projection surface SC based on the first rectangle RE1s.SELECTED DRAWING: Figure 11

The utility model relates to a side length reinforced geogrid which comprises a plurality of regular hexagon units arranged in a determinant mode and quadrilateral units located in the regular hexagon units, and the four corners of each quadrilateral unit are located on the four side edges of the corresponding regular hexagon unit respectively. First reinforcing ribs which are arranged in a crossed mode and serve as rectangular diagonals are further arranged in the quadrilateral units. The quadrangle units are arranged in the regular hexagon units, the corners of the quadrangle are located on the four side lengths of the hexagon, and therefore the strength of the side lengths of the regular hexagon units is enhanced, meanwhile, the strength of the side lengths of the regular hexagon units is further enhanced through the arrangement of the first reinforcing ribs, and the stress strength of the corners of the quadrangle is improved; the interlocking effect is improved, and meanwhile the supporting strength in the quadrangle is enhanced.

The application discloses a negative Poisson's ratio bidirectional energy dissipation cross type energy dissipation component, which is characterized by comprising a frame (5) and a connecting piece (6), the frame (5) is a rectangular frame, the connecting piece (6) is arranged at the center position of the frame (5), and a core unit (2) is movably connected between the connecting piece (6) and four corners of the frame (5), respectively. Negative Poisson's ratio holes are arranged in the middle part of the core unit (2) in a circulating manner, and the negative Poisson's ratio holes are at least two columns of positive-negative orthogonal semi-recessed hexagonal holes. Under the action of an earthquake, the whole frame will move laterally, the lateral displacement of the frame is transmitted to four supports arranged along two diagonal lines through axial force, then two supports on one diagonal line will be subjected to axial tension, two supports on the other diagonal line will be subjected to axial pressure, and the energy dissipation section of the core member in the support is provided with the recessed hexagonal negative Poisson's ratio holes arranged in a circulating manner, so that the energy dissipation section will be deformed.

The invention belongs to the technical field of structural strength design, and particularly relates to a grid structure shear modulus determination method and device.The method comprises the steps that S1, the long edge diagonal line size 2a, the short edge diagonal line size 2b and the beam frame width h of a grid unit are determined, the grid unit is the minimum repetitive unit forming the grid structure, and the grid unit is the minimum repetitive unit forming the grid structure; the grating unit is a rhombic beam frame, and the grating structure is a part of a full-aircraft structure; s2, the elastic modulus E of the material of the grid structure is obtained; s3, determining the shear modulus G12 of the grid structure according to the following formula: G12 = Ehab / L3; wherein L is the side length of each grating unit. According to the method, the calculation time is shortened, and the full-aircraft structure scheme iteration and parameter optimization efficiency is improved.

To provide a flaw grinding order determination method capable of sequentially and efficiently grinding a plurality of various flaws including a rectangular flaw.SOLUTION: This flaw grinding order determination method for determining an order of grinding and removing a plurality of flaws generated on the surface of a material to be machined classifies flaw types into linear and / or rectangular flaws, moves a grinding tool from one end to the other end for the linear flaw and moves the grinding tool from one end to the other end for the rectangular flaw, then moves the grinding tool toward the other of parallel sides on a diagonal line, and moves the grinding tool from one end to the other end along the other of the diagonal lines as constraints, and determines the flaw grinding order so as to shorten a grinding distance or grinding time most by an integer schedule method.SELECTED DRAWING: None

In the energy-absorbing member (10), a first plate section (41) and a pair of second plate sections (42, 42) constitute a base unit (20) having a U-shaped cross-section, the base unit (20) comprising a press-molded article. An inner surface (21) and an outer surface (22) of the basic unit (20) configured in the U-shaped cross-section are contours that do not have an undercut shape in a direction along a reference line (CL2). The first plate section (41) and the pair of second plate sections (42, 42) have imaginary parallelograms (90) that are offset about an axis (CL1) from a first end surface (51) to a second end surface (52) of the base unit (20). At least one of the two diagonal lines (91, 92) of the virtual parallelogram (90) is formed by a fold line.

The light-weight inflatable bag panel supporting structure comprises a main structure framework, a panel and an air bag, the main structure framework is of an oblique quadrangular prism structure formed by rigidly connecting a plurality of truss rod pieces through a plurality of multi-way wrapping and sleeving pieces, and the truss rod pieces are arranged on the two parallelogram side faces of the main structure framework along the short diagonal lines correspondingly; the inclined quadrangular prism structure is divided into two horizontal triangular prism structures, and the multi-way wrapping and sleeving piece comprises a plurality of sleeves for installing truss rod pieces. The panels are fixedly connected to the upper surface and the lower surface of the main structure framework; the space between the panel and the adjacent horizontal triangular prism structure is filled with the air bags, and the air bags are inflated to be used for supporting the panel. According to the panel supporting structure, an inflatable bag structure system is adopted, the out-of-plane static and dynamic rigidity of a large-breadth panel in wing and rudder components is effectively improved, and the panel supporting structure is simple in structure, efficient and beneficial to achieving light-weight design.

The present invention provides a flatness measuring unit mounted on a shelf and used to measure flatness related to the degree of deviation from the condition where four predetermined locations on the shelf are located on the same plane. The unit comprises: a main frame; and four grounding portions dispersedly arranged on the main frame and configured to ground the four predetermined locations on the shelf. The four grounding portions include two first grounding portions that are not located at diagonal positions, and two second grounding portions other than the first grounding portions. The center of gravity is set in an area including the two first grounding portions, among the four areas of the flatness measuring unit divided by two diagonal lines passing through the first and second grounding portions located at diagonal positions.

1. The name of the product of this design: diagonal measurement fixture. 2. Purpose of this design product: A fixing device that can prevent the measuring tape from slipping off the corner when measuring the diagonal line. 3. The design key point of this appearance design product lies in the shape. 4. The picture or photo that best illustrates the design points: Stereoscopic diagram 1.

The invention relates to a centrosymmetric grating assembly, an inclination angle measuring method and an inclination eliminating method. According to the inclination angle measurement method based on the centrosymmetric grating assembly, moire fringes in at least one quadrant formed by a first grating and a second grating are obtained, the frequency components of the moire fringes in the two diagonal directions of the quadrant are obtained, and the included angle between the fringes and the original grating direction is calculated through the frequency components. And calculating an inclination angle between the first grating and the second grating through the included angle. In the scheme, the orthogonal component of the moire fringes can be extracted by decomposing the frequency of the moire fringes obtained after the gratings are inclined or the equivalent phase change of the moire fringes, the included angle of the corresponding moire fringes is obtained based on the orthogonal component, and the final inclination angle between the two gratings can be further obtained through the inclination angle of the moire fringes. Therefore, the angle between the mask and the wafer during photoetching can be corrected according to the obtained inclination angle.

The invention provides a displacement-controllable plate two-way stretching instability judgment method, and relates to the technical field of two-way stretching, and the displacement-controllable plate two-way stretching instability judgment method comprises the following steps: determining the stretching proportion of a material in a two-way stretching test under a cross beam displacement control mode, preparing a two-way stretching sample, and determining that the contour shape of an overlapping region in two stretching axis directions of the sample is circular or rectangular, making an inscribed rectangle or an inscribed circle towards the center to form an inner contour shape and an outer contour shape; sticking mark points at the intersection point and the center point of the inner and outer contours; starting a two-way tensile test according to a load-time curve and a relative angle displacement-time curve, calculating a displacement difference absolute value of two tensile direction mark points of the same diagonal line in the test process, extracting a displacement difference absolute value of the other diagonal line at the moment when the displacement difference absolute value is the maximum value, and calculating the sum; the sum is compared, and the instability moment of the plate and the corresponding instability stress and instability strain are determined; and inputting the instability stress and the strain into finite element software, and judging the forming safety of the plate.

The invention relates to a grid processing method, which is used for encrypting octree hexahedral grid units overlapped with near wall surface hexahedral grid units, and comprises the following steps: extracting all octree hexahedral grid units overlapped with the near wall surface hexahedral grid units as octree boundary grid units; aiming at each extracted octree hexahedron boundary grid unit, calculating a first diagonal length of the octree boundary grid unit and a second diagonal length of a near wall surface hexahedron grid unit overlapped with the octree boundary grid; if the length of the first diagonal line is greater than or equal to half of the length of the second diagonal line, encrypting the octree boundary grid unit; judging whether the encrypted octree boundary grid unit is overlapped with the near wall surface hexahedron grid unit or not; and if so, repeating the above steps until the length of the first diagonal line is less than half of the length of the second diagonal line.

To provide a game machine having a feature in attachment structures of a plurality of members.SOLUTION: A game machine includes a first member which can be fixed to a base, and a second member which can cover at least a part of the first member. The first member includes a plurality of first through holes, and a plurality of second through holes. The second member includes a plurality of third through holes. The first through hole is used for fixing the first member of the first and second members to the base. The second through hole and the third through hole are used for fixing both of the first member and the second member to the base. Additionally, when connecting the plurality of first through holes and the second through holes in both sides of the plurality of first through holes with imaginary straight lines, an imaginary quadrilateral is formed. The plurality of first through holes are arranged in apexes at end points of diagonal lines of the imaginary quadrilateral. The base includes a frame part formed to match to the shape of the first member.SELECTED DRAWING: Figure 36

The application relates to the technical field of beam structures, in particular to a beam structure which comprises a beam main body and connecting bases, the number of the connecting bases is two, the two connecting bases are symmetrically arranged at two ends of the beam main body, and a butt joint mechanism is arranged between the connecting bases and the beam, the beam main body comprises an outer shell, longitudinal ribs, plate ribs and inclined ribs, the surface of the beam main body is provided with a track structure, the two ends of the inclined ribs are respectively connected with one side of the inner top wall of the outer shell and the inner bottom of one side, the surface of the outer shell is provided with a track and other protruding structures, therefore, the inclined ribs in the beam can realize internal diagonal line connection of the outer shell with the shortest length, the weight of the beam structure is reduced while the strength of the outer shell is improved, and the beam structure can realize minimum weight on the premise of guaranteeing overall strength through the arrangement of the longitudinal ribs, the plate ribs and the reinforcing ribs, so that light weight and high rigidity are considered.

On the first diagonal, the member is arranged in cooperation with the subframe and the undercover. Further, the cover front-side connection portion and the cover rear-side connection portion are located on or near the first diagonal line. Further, the undercover is provided with a reinforcing portion extending on a second diagonal line which is a diagonal line of a quadrangle having a cover front side connecting portion and a cover rear side connecting portion as a top portion. Therefore, the rigidity of the frame front connecting portion can be increased. In this structure, since it is not necessary to provide an additional component different from the undercover, it is possible to eliminate an increase in the number of components due to the additional component and an occupation of space due to the additional component.

Air extraction box and method for installing it Air extraction box (1), comprising: an enclosure (3), with three support faces (10Y, 10Z), adjacent to a first vertex (5A) and three secondary faces (20X, 20Z) adjacent to a second opposite vertex (5G); inlet compartments (51) and outlet compartments (52), delimited by the enclosure and separated by a first partition (30), crossed by an internal diagonal (A6) connecting said vertices (5A, 5G); an inlet opening (11Y), crossing one of the support faces and opening into the inlet compartment; an outlet opening (21Z), crossing one of the secondary faces and opening into the outlet compartment; and a wheel (61), in the outlet compartment, of which an axis of rotation (R61) is parallel or coaxial with the internal diagonal (A6). Figure for the abbreviation: Figure 3

The invention discloses a tapestry brick pipeline trepanning, marking and positioning method. The method comprises the steps that non-trepanning tapestry bricks on the periphery of a pipeline are laid, and a laying space is reserved; the two adjacent edges of a tapestry brick to be perforated abut against the pipeline and the laid tapestry brick respectively, and two first marking lines are drawn through a right-angle ruler; translating the tapestry bricks to change the abutting relation, and then drawing two second marking lines; the four marking lines define a square, the intersection point of diagonal lines is the circle center of the opening, and the side length is the diameter of the opening; and punching according to the positioning and paving. And the steps are repeated when multiple pipelines are perforated. Complex tools are not needed, geometric transformation is achieved through brick body translation, the pipeline contour is converted into regular square positioning, the positioning precision is high, operation is easy and convenient, the speed is high, measurement deviation is effectively avoided, the rework rate is reduced, and the method is suitable for multi-pipeline and special-shaped arrangement scenes and has practical popularization value.

The application belongs to the technical field of structural strength design, and particularly relates to a method and device for determining the tensile and compressive modulus of a grid structure. The method comprises the following steps: S1, determining the long diagonal size 2a and short diagonal size 2b of a grid unit, and the beam width h of the grid unit, wherein the grid unit is the smallest repeating unit of the grid structure, the grid unit is a diamond-shaped beam, and the grid structure is part of a full-aircraft structure; S2, obtaining the elastic modulus E of the material of the grid structure; and S3, determining the tensile and compressive modulus of the grid structure according to the following formula: E1=(Eh 3 aL) / (b 3 L 2 +h 2 a 2 b) and E2=(Eh 3 bL) / (a 3 L 2 +h 2 b 2 a), wherein E1 is the tensile and compressive modulus along the long diagonal, E2 is the tensile and compressive modulus along the short diagonal, and L is the side length of the grid unit. The application shortens the calculation time and improves the efficiency of the iteration and parameter optimization of the full-aircraft structure scheme.

The invention discloses a quadrilateral mesh lightweight method and system, a storage medium and equipment, and the method comprises the steps: receiving an input mesh, and converting the input mesh into an initial quadrilateral mesh if the input mesh is a triangular mesh; performing iterative optimization on the initial quadrilateral grid by taking a variance of minimizing a side length and a diagonal length of the quadrilateral grid as an isometric optimization target; in the iterative optimization process, cooperatively executing local operation set and tangent space smoothing so as to gradually reduce the number of patches of the initial quadrilateral mesh and maintain a geometric structure; combining feature line retention and adaptive density control based on a user predefined density function to retain geometric features and adjust grid densities of different areas; and when a preset termination condition is met in the iterative optimization process, outputting the lightweight target quadrilateral mesh. According to the method, the structure regularity and geometric fidelity of the simplified grid are improved, and the problem of grid degradation caused by a traditional global folding method is effectively solved.

The invention belongs to the technical field of aircraft design, and relates to a method and a device for checking the shear strength of a rhombic grid structure. The method comprises the steps that S1, the side length L, the long diagonal size 2a, the short diagonal size 2b and the beam frame width h of a grating unit are determined, the grating unit is a minimum repeated unit forming a grating structure, the grating unit is a rhombic beam frame, and the grating structure is a part of a full-aircraft structure; s2, axially symmetrical shear loads applied to the four ends of the grating units are obtained; and S3, the safety margin of the grid units is determined. According to the method, the calculation time is shortened, and the structure parameter iteration speed is increased.

The present invention discloses a high-efficiency and stable method for simulating inextensible ropes in crane and hoist. The piecewise linear inextensible rope is usually represented by the Cartesian coordinates of the vertices and the quaternions on the segments, which uses too many degrees of freedom and needs many constraints, bringing unnecessary numerical difficulties and computational burden to the simulation. The present invention proposes a compact representation which uses the minimum number of degrees of freedom and naturally satisfies all the additional constraints. Specifically, the rope is regarded as a chain of rigid segments, and its shape is encoded as the Cartesian coordinates of its root vertex and the axis-angle representation of the local coordinate system on each segment. Under the representation of the present invention, the implicit time-stepping matrix has a special non-zero pattern. Using the non-zero pattern, the present invention designs a preconditioner which can solve the related linear equations with approximate linear complexity, and its speed is improved by one to two orders of magnitude compared with the widely used block-diagonal linear PCG solver.

The invention discloses a polyhedral metamorphic paper folding mechanism which is a closed body formed by six same surface units. The surface unit has an initial form and a structural form, the initial form is a square sheet, and the square sheet has four vertex angles and two diagonal lines; the surface unit comprises a square central area, four same sharp corners formed by folding top corners along diagonal lines, and four same trapezoidal surfaces formed by folding inwards along four edges of the square central area; the bending directions of the sharp corners and the trapezoidal surfaces are the same; the lower bottom of the trapezoidal surface is the edge of the square central area, and the upper bottom of the trapezoidal surface is positioned on the edge of the square sheet; the six surface units are mutually connected in a structural form, two upper bottoms of the trapezoidal surfaces of two adjacent surface units form line connection, and the tips of the three sharp corners of three adjacent surface units form point connection. The polyhedral metamorphic paper folding mechanism is simple in structure, high in strength, capable of being repeatedly used and high in motion precision.

The invention discloses a flexible sheet feeding and conveying method, and belongs to the technical field of flexible sheet conveying methods. The method comprises the specific steps that a to-be-conveyed piece is obtained, and the to-be-conveyed piece is flatly laid on a carrier plate structure; the spinning assembly is rotated to the position above the to-be-conveyed piece; selecting a basic diagonal line of the to-be-conveyed piece, and applying pressure to the basic diagonal line; selecting symmetrical diagonals, and applying pressure to the symmetrical diagonals; when the basic diagonal line and the symmetrical diagonal line are both subjected to the pressure effect, the spinning assembly is adjusted to press the basic diagonal line and the symmetrical diagonal line of the to-be-conveyed piece; position information of the target position is obtained, and the to-be-conveyed part is conveyed to the target position; and the spinning assembly is adjusted to sequentially release the symmetric diagonal line of the to-be-conveyed piece and the basic diagonal line of the to-be-conveyed piece, and the spinning assembly is rotated to leave the position above the to-be-conveyed piece. Through step-by-step pressure application on the basic diagonal line and the symmetrical diagonal line, the clamping mark damage condition occurring during clamping and limiting of the flexible sheet is improved.

The inventors of this invention noticed that conventional seedling transplanters were not always easy to use when utilizing their convenient functions. More specifically, the inventors noticed a need for highly accurate seedling transplanting with minimal manual operation. [Solution] A rice transplanter 1 that manually performs field shape teaching by tracing all the edges of a roughly polygonal field 50 without overlapping the edges, before creating an automatic straight-line reciprocating travel path in a roughly polygonal field 50, wherein in field shape teaching, the transplanter starts from a predetermined vertex Va of the roughly polygonal shape, traces the edges to other predetermined vertices Vb of the roughly polygonal shape excluding the predetermined vertex Va, moves to a vertex Vc of the roughly polygonal shape via a diagonal D passing through the interior of the roughly polygonal shape, and then traces the remaining edges.

The embodiment of the present application discloses a method and system for calculating the volume of a hexahedron based on a digital twin, the method comprising: numbering the eight vertices of the target hexahedron according to a set numbering rule; determining the coordinates of the eight vertices of the target hexahedron; further calculating the diagonal vector coordinates of each face of the target hexahedron according to the coordinates of the vertices; forming a matrix with the diagonal vectors, calculating the matrix determinant; and finally adding the results of the matrix determinant of each face to obtain the volume of the target hexahedron. In view of the problems that the existing calculation of the floating-point number of the hexahedron volume is cumbersome and consumes a lot of computing resources, starting from the construction of a tetrahedron, the volume of the tetrahedron is decomposed into the sum of six sub-volumes, reducing the number of floating-point operations for calculating the volume of the hexahedron.

The invention belongs to the technical field of sensing, and particularly relates to a touch sensor with a multi-stage dome structure, a preparation method of the touch sensor and braille recognition equipment. The tactile pressure sensor comprises a substrate and at least three dome structure units which are arranged on the substrate and are of different-size hemispherical structures, all the dome structure units are arranged in a gradient size mode to form a multi-stage dome structure, and the multi-stage dome structure is arranged in a central symmetry mode, a diagonal symmetry mode or an axial symmetry mode with the central dome structure unit as the center. And the radius of each dome structure unit is 200 [mu] m to 500 [mu] m. According to the gradient design of the multi-stage dome structure, stress distribution is more uniform, local stress concentration is avoided, the anti-fatigue performance of the structure is improved, the service life of the structure is prolonged, high sensitivity and smooth response transition are achieved through a degree size arrangement mode, the linear working range of the sensor is widened from 1N-5N to 0.1 N-20N, and the linear working range of the sensor is widened from 1N-5N to 0.1 N-20N. And dual optimization of the measuring range and the sensitivity is realized.

The present application provides a method and device for drawing a spherical rectangle. The four vertices of the spherical rectangle are vertex P1, vertex P2, vertex P3 and vertex P4 in clockwise direction. The method includes: taking two points on the spherical surface as the vertex P1 and the vertex P3; using the above-mentioned vertex P1 and vertex P3 to calculate the spatial coordinates of the vertex P2 and the vertex P4, and the spatial coordinates take the center of the sphere as the origin; dividing the plane rectangle formed by vertex P1, vertex P2, vertex P3 and vertex P4 into two large triangles along the diagonal; using the preset triangle cutting area, dividing the large triangle into several small triangles; mapping the small triangles from the plane to the spherical surface; drawing the small triangles, thereby achieving the drawing of the spherical rectangle. According to the technical solution of the present application, a spherical rectangle can be drawn on a three-dimensional spherical surface according to any two points as the diagonal vertices of the spherical rectangle, as well as the radius of the sphere and the triangle cutting accuracy.

The present invention provides a method for detecting and classifying materials. The method includes: at a first moment, obtaining the first marker point coordinates of at least one vertex on any diagonal of the rectangular positioning frame corresponding to each material; at a second moment, obtaining the second marker point coordinates of two vertices on the diagonal of the rectangular positioning frame corresponding to each material, and calculating the marked range of the rectangular positioning frame corresponding to each material at the second moment; obtaining the moving distance Lm of the conveyor belt on a straight line between the first moment and the second moment; determining whether there is a target material whose value of the first marker point coordinates + Lm falls within the marked range. If so, defining the target material and the material corresponding to the second marker point coordinates as the same material.

The invention discloses a special-shaped tubular column bracket three-dimensional positioning and assembling method and a drawing marking system, and belongs to the technical field of steel structure machining. According to the method, the center line of a quartered cross serves as the reference, the arc length of the root of a bracket, the space included angle and the flange vertical distance are converted into measurable linear sizes, upper and lower flanges are fixed in a jig frame through a normalized triangular support, and welding is conducted after arc length difference and diagonal two-stage actual measurement closed loop; and a drawing marking system gives out all sizes and diagonal theoretical values extracted by the three-dimensional model on the same 1: 1 expanded strip graph, so that a design-manufacturing data closed loop is realized. According to the method, multidirectional bracket millimeter-level positioning can be completed in a common workshop without numerical control equipment, the datum drift, the drawing recognition error and the rework rate are remarkably reduced, and the method is suitable for batch manufacturing of bracket circular pipe columns with space angles in super high-rise and large-span space steel structures.