26 results about "Diagonal" patented technology

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.

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 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 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.

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 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 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 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 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.

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 application discloses a high-sealing high-precision spiral bevel gear contact spot design method, which comprises the following steps: step 1, obtaining a part processing adjustment card; step 2, first inputting part basic parameters, generating a parameter page through Gleason calculation, and comparing the obtained reference page with the adjustment card parameters; step 3, when a spiral bevel gear quality qualified signal of a comparison module is obtained, the data of a pinion is obtained, and whether the midpoint spot is moderate in size and whether it runs out of the tooth surface is judged; and step 4, an adjustment coefficient is calculated according to the length coefficient, the width coefficient, the convex surface diagonal line coefficient and the concave surface diagonal line coefficient of the pinion. The application improves the adjustment precision of the spiral bevel gear contact spot and guarantees the qualification of the spiral bevel gear contact spot.

This product consists of sets of several or dozens of blocks in six different shapes: a cube, a half-size cube with approximately half the volume obtained by cutting a cube in half parallel to one of its faces, a rectangular prism with approximately twice the volume obtained by connecting cubes side by side, a cylindrical shape that fits perfectly into the size of a cube, a spherical shape, and a triangular prism obtained by cutting a cube in half along the same diagonal line on opposite faces. Each block has a regular arrangement of dot indentations on its designated face, which is intended to evoke the idea of ​​systematically stacking and assembling blocks.

To provide a tension and torsion load device and a tension and torsion load test system for realizing a tension-torsion load mode by applying a torsion load by converting the displacement of a test piece in the tensile direction into the change of the diagonal line position of a parallelogram by using the easily deformable characteristics of the parallelogram, and applying a tension load.SOLUTION: The tension-torsion load testing system includes a tension testing machine and a tension-torsion loading device, an upper loading head of the tension testing machine clamps the connector, and a lower loading head is opposite to the clamping head. To realize a tensile and torsional load system for converting the displacement in the tensile direction of a test piece into the change of the position of a diagonal line, applying a torsional load and applying a tensile load by utilizing the easily deformable characteristics of a parallelogram and to sharply reduce a purchase cost as compared with a multiaxial load testing machine.SELECTED DRAWING: Figure 1

The present invention provides a base plate with a suspension hole structure that allows for position adjustment after the steel plate has been laid. [Solution] A base plate has a hanging hole structure in which a pentagonal vertex 1 is formed toward the long side of the base plate at a predetermined distance from the long side of the base plate, and the center of the arc-shaped part of the pentagonal vertex 1 is formed toward the long side of the base plate, and the center of the arc-shaped part of the pentagonal vertex 1 coincides with the longitudinal center of the base plate, and the side of the pentagon provided on the opposite side of the arc-shaped part is provided as a flat hanging part 2, and the length of the side of the flat hanging part is shorter than the diagonal line connecting the two corners of the first corners 3 and 3' that are connected to the arc-shaped part.

The invention provides an etalon for an optical three-dimensional measurement system and a calibration method. The etalon comprises a test sample block and a target ball group, the test sample block comprises a bottom plate, a square block and inclined blocks, the bottom surface of the square block is fixed on the bottom plate, the cross section of the square block is square, and the four inclined blocks are fixedly connected between the four side surfaces, perpendicular to the bottom plate, of the square block and the bottom plate respectively; the target ball group comprises five standard balls, the first standard ball is fixed in the center of the top of the square block, the second, third, fourth and fifth standard balls are fixed on the bottom plate and are respectively positioned in four directions of two diagonal lines of the bottom surface of the square block, and the distances between the second, third, fourth and fifth standard balls and the first standard ball are the same. The standard device integrating the standard ball and the standard flat plate is designed, and the technical problem that the angle of the standard device needs to be adjusted in the calibration process is solved.

The invention discloses a body-in-white opening deformation analysis method and system, and belongs to the technical field of body simulation analysis, and the method comprises the steps: obtaining a body-in-white analysis model and a diagonal node of a previous model corresponding to the body-in-white analysis model; for each diagonal node of the previous model, determining a part closest to the diagonal node of the previous model in the body-in-white analysis model; obtaining a boundary point of the nearest part; selecting a point closest to the diagonal node from the boundary points of the closest part as the diagonal node of the body-in-white analysis model; and according to the body-in-white analysis model of which the diagonal nodes are determined, determining the opening deformation of the diagonal of the body-in-white. The diagonal nodes of the body-in-white are automatically selected, and then the opening deformation of the body-in-white is accurately determined.

The invention provides a plate two-way stretching strain instability judgment method adopting strain control, and relates to the technical field of two-way stretching. Comprising the following steps: determining the stretching ratio of a material in a two-way stretching test, preparing a two-way stretching sample, determining that the contour shape of an overlapped region in the directions of two stretching shafts of the sample is a circle or a shape subjected to regularization treatment through an inscribed circle, and marking four axis intersection points in the stretching direction, two intersection points in the diagonal direction and a central point on the contour; starting a two-way tensile test in a strain control mode, and outputting a displacement-time curve of the mark points in the tensile direction and the mark points in the diagonal direction; calculating a displacement increment average value of the mark points in the diagonal direction before 50% of the total test time, and judging an instability moment when the displacement increment exceeds the average value; comparing the instability moments in the diagonal directions, and taking the strain in the stretching direction corresponding to the earliest instability direction as the instability strain under the current stretching proportion; and inputting the instability strain into finite element software, and judging the forming safety of the plate.

The present invention relates to a unit magnet (4) in the form of an elongated polyhedral block having magnetization lines extending along its length, wherein the elongated block forming each unit magnet (4) has a rhomboid cross-section without right angles at the vertices, wherein the cross-section of each unit magnet (4) is less than 25 mm. 2 Furthermore, the ratio of the longest diagonal of the rhomboid cross-section of each unit magnet (4) to the length of the unit magnet (4) is less than 0.5. The present invention also relates to a magnet structure (10) comprising a plurality of such unit magnets (4).