21 results about "Compressive stiffness" patented technology

This invention relates to a design method for reinforcing rock mass structures with small-diameter piles under post-load conditions in the field of slope protection. The method first obtains the inclination angle θ of the outward-dipping structural surface, the internal friction angle and cohesion c, the sliding mass weight γ, the sliding mass height H, the stress ratio n between the pile and the rock mass at the structural surface, the vertical load q applied to the upper part of the sliding mass after the construction of a single deeply embedded small-diameter anti-slide pile, the sliding mass width b, and the horizontal extension length l. Then, using these parameters, it calculates the initial axial force of the deeply embedded small-diameter anti-slide pile before sliding, the deflection angle of the deeply embedded small-diameter anti-slide pile when the anti-slide force is at its maximum, the minimum compressive stiffness of the small-diameter anti-slide pile, and the axial force and anchorage length of the deeply embedded small-diameter anti-slide pile caused by compression after minor deflection deformation at the structural surface. This invention saves resources compared to empirical design methods.

The application discloses a kind of process methods of controlling transformer winding deformation amount, it is related to transformer manufacturing technical field, comprising the following steps: S1 the axial force distribution under multiple working conditions is calculated and weighted superposition is obtained comprehensive axial force field function, according to this, pre-tightening force demand distribution function is constructed, according to the distribution characteristics of pre-tightening force demand distribution function, winding is divided into several pre-tightening subareas along the axial direction;S2 according to each pre-tightening subarea, the gasket of different compression stiffness is configured, and in pre-tightening force attenuation sensitive area, the self-awareness compensation gasket with insulating packaging layer is configured;S3 sequentially carries out cyclic pre-compression processing, step loading stress redistribution, thermal coupling solidification and deadweight compensation differentiation pre-tightening processing;S4 actual pre-tightening force distribution is measured by embedded sensor, deviation with target value is evaluated and adjusted;S5 is completed fastening using subarea independent fastening system.

A paperboard winding tube (10) of enhanced compression stiffness and resistance to deformations leading to ovality under gravity type loading is disclosed. The paperboard winding tube (10) may include a cylindrical body wall (12) formed from a plurality of structural paperboard layers (30-40) with at least one central structural paperboard layer (34, 36) disposed between at least one radially inward structural paperboard layer (38, 40) and at least one radially outward structural paperboard layer (30, 32). The radially inward and the radially outward structural paperboard layers (30, 32, 38, 40) may be formed of a paperboard ply of a first stiffness, and the central structural paperboard layer (34, 36) may be formed of a paperboard ply of a second stiffness that is less than the first stiffness. The arrangement of the plurality of structural paperboard layers (30-40) increases the compression stiffness of the paperboard winding tube (10) to resist deformations leading to ovality of the cylindrical body wall (12) under gravity ty pe loading of the paperboard winding tube (10).

This disclosure proposes a simulation method, apparatus, generation system, and storage medium for a target device, relating to the field of industrial design technology. The simulation method for a target device includes: setting tension / compression elements in the target direction of a finite element model of the target device, wherein a first end of the tension / compression element is connected to the finite element model, the compressive stiffness of the tension / compression element is greater than or equal to a first threshold, and the tensile stiffness is less than or equal to a second threshold, the first threshold being significantly greater than the second threshold; performing displacement loading and unloading operations on the finite element model in the target direction based on a predicted displacement value; and determining the evaluation result of the target device based on the loading amount and a preset evaluation threshold, wherein the loading amount includes at least one of the loaded pressure or energy. This method can improve simulation efficiency and contribute to improving device design efficiency.

The utility model relates to the technical field of rubber elastic cushion plates, and discloses a rubber elastic cushion plate for rail transit, which comprises a rubber elastic cushion body, a reinforcing component is arranged on the surface of the rubber elastic cushion body, the reinforcing component comprises a graphite heat dissipation layer, the bottom of the graphite heat dissipation layer is fixedly connected with the top of the rubber elastic cushion body, and the bottom of the graphite heat dissipation layer is fixedly connected with the top of the rubber elastic cushion body. The graphite heat dissipation layer is made of a graphene composite rubber material, the top of the graphite heat dissipation layer is fixedly connected with a plurality of anti-skid plates, and a plurality of buffer assemblies are arranged at the bottom of the metal net reinforcing layer. According to the rubber elastic cushion, heat can be quickly dissipated into the air through the graphite heat dissipation layer, the compressive rigidity can be improved and the sleeper pressure can be dispersed through the metal net enhancement layer, and therefore the effects of enhancing heat dissipation of the rubber elastic cushion body and improving the overall performance of the rubber elastic cushion body are achieved, and the problems that a traditional rubber elastic cushion is poor in heat dissipation effect and not prone to deformation are solved. And therefore, the overall use performance of the elastic cushion is improved.

The invention provides an intermittent bidirectional-pressure-bearing axial limiter and a manufacturing method thereof. The intermittent bidirectional-pressure-bearing axial limiter comprises a cylindrical outer shell, an inner shaft, two spring force transmission sliding lantern rings and a spring, wherein the two ends of the cylindrical outer shell are open; the inner shaft is arranged in the outer shell in a penetrating mode, the inner shaft is sleeved with the two spring force transmission sliding lantern rings, and the two spring force transmission sliding lantern rings are in clearance fit with the inner shaft and the outer shell respectively; the limiting action stroke is L, the total compression amount of the spring is S, the compression rigidity is K, and the lantern ring has the sliding bearing function. According to the working principle, under the action of bidirectional axial force, when the relative movement value of the inner shaft between the middle balance position and the outer cylinder is larger than or equal to L, the inner shaft drives the corresponding lantern ring to compress the spring, the spring absorbs impact energy to achieve buffering limiting, and after the force disappears, the spring resets to drive the inner shaft to return to the initial position. The same group of springs can be pressed and limited bidirectionally, the internal structure is simple, the buffering and damping performance is excellent, and the two-way axial buffering and limiting device can be widely applied to various related engineering scenes needing two-way axial buffering and limiting constraint.

The invention discloses a prestressed cable reinforced one-way sliding structure with adjustable rigidity and an energy dissipation effect. The structure consists of N (N is greater than or equal to 2) rigid columnar units which are annularly and uniformly distributed and a continuous rope. The adjacent columnar units are connected through prism pairs only allowing axial one-way sliding. One end of the rope is fixed to the upper node of any starting unit, and the other end of the rope sequentially penetrates through the upper nodes of the other units in the clockwise direction and is finally fixed to the lower node of the starting unit. And at each node in the middle, the rope can slide relative to the node. By applying pretension to the ropes, the structure can achieve a stable geometric self-balancing state, the overall axial compression rigidity is mainly provided by the pretension of the ropes, and the rigidity can be dynamically adjusted by adjusting the pretension of a single rope under the condition that the geometric shape of the structure is not changed. Under the action of an axial load, the deformation of the structure is mainly caused by sliding friction between the rope and the node, and a good energy dissipation effect is achieved.

This invention provides a design method, device, equipment, and medium for pile groups of unequal lengths on steep slopes, relating to the field of pile foundation design technology. The method includes: calculating the stiffness of the embedded pile section based on the vertical compressive stiffness of a single pile on flat ground, taking into account the parameters of the pile foundation structure and soil layer parameters on the slope; deriving a vertical stiffness model for a single pile on the slope based on the pile foundation structure, the length of the free section pile, and the stiffness of the embedded pile section; calculating the length of the free section pile based on the vertical stiffness model of the single pile on the slope and the slope topographic parameters, thus constructing a vertical stiffness model for the pile group on the slope; establishing the vertical stiffness model of the pile group on the slope and the expression for the design of the pile group with equal stiffness based on the spatial relationship between the slope and the pile foundation and the principle of equal stiffness, thus obtaining a basic model for the equal stiffness design method; calculating the length of the embedded pile section in the pile group based on the basic model of the equal stiffness design method, and constructing a pile group design scheme by combining the length of the embedded pile section and the length of the free section pile. This invention solves the problem of uneven stress and settlement in pile group foundations on slopes.

The invention provides a bolt connection strength simulation analysis method and system, and relates to the technical field of simulation analysis methods, and the method comprises the following steps: respectively calculating the axial rigidity of a bolt and the compression rigidity of a connected piece by adopting an axial elastic modulus method, constructing a parallel rigidity distribution model, and calculating the additional tension of the bolt; respectively calculating the axial tensile stress and the shear stress of the bolt by adopting an area uniform stress method, and calculating the equivalent stress of the bolt by adopting a shear strain energy equivalent method; and calculating the safety coefficient of the bolt by adopting an equivalent stress safety margin method, comparing the safety coefficient with a preset safety threshold value, and outputting a corresponding bolt strength grade. The additional pulling force is dynamically distributed through the rigidity of the bolt and the connected piece, and the force transmission characteristic in the actual bearing process is closer; by introducing the screw pitch to correct the nominal diameter, the actual stress distribution of the thread root is described more accurately; the equivalent stress is calculated through a shear strain energy equivalent method, and the yield criterion of the plastic material is better met.

This invention provides an adjustable stiffness wind-resistant bearing, relating to the technical field of wind-resistant bearings. The adjustable stiffness wind-resistant bearing includes a left side plate, a spherical cap liner, an intermediate body, a helical height adjustment component, a right side plate, and a counterweight assembly. The plane of the spherical cap liner is connected to the left side plate, and the spherical surface of the spherical cap liner is connected to the intermediate body. The intermediate body is provided with a slide rail and a male helical surface. The helical height adjustment component is provided with a female helical surface, and the male helical surface is adapted to the female helical surface. The right side plate is provided with a slide groove, which is adapted to and connected to the slide rail. The counterweight assembly includes a wire rope, a counterweight tray, and a counterweight block. One end of the wire rope is connected to the helical height adjustment component, and the other end is connected to the counterweight tray, passing through the right side plate. The counterweight block is installed on the counterweight tray. This adjustable stiffness wind-resistant bearing solves the technical problems of existing wind-resistant bearings, such as non-adjustable compressive stiffness, limited compressive stiffness design range, and the elastic element being in a compressed state for a long time, leading to easy elastic failure.

The present application relates to the technical field of H-type vertical axis wind turbine blade, and particularly relates to a blade structure of an H-type vertical axis wind turbine which is formed by compounding a once-pultruded carbon fiber core material with other carbon fiber materials.1. The present application can improve the structural strength of the vertical axis wind turbine blade and solve the problem of fatigue fracture of the vertical axis wind turbine blade.2. The present application effectively utilizes the advantages of the carbon fiber pultrusion process, greatly improves the tensile properties in the length direction of the blade, and combines the core material and the composite material skin to improve the stiffness in the remaining directions of the blade.3. The carbon fiber pultruded plate and the carbon fiber fabric are laminated and combined to manufacture the blade contour; the core material used has high shear strength and compression stiffness; and the blade synthesized with other materials can effectively prevent buckling and resist planar shear load.4. The carbon fiber composite material blade structure of the H-type vertical axis wind turbine can not only improve the impact resistance and stability of the blade, but also focuses on solving the weight of the blade, reduces the weight of the wind wheel, and makes a major change to the structure.5. The light-weight carbon fiber composite material blade and the wind turbine blade structure can reduce the weight of the wind wheel by 70-80% compared with the traditional aluminum alloy blade, greatly reduce the weight of the blade, and have light weight, high strength, and long product life cycle.

The application provides a bolt connection strength simulation analysis method and system, relates to the technical field of simulation analysis methods, and comprises the following steps: respectively calculating the axial stiffness of a bolt and the compression stiffness of a connected part by adopting an axial elastic modulus method, constructing a parallel stiffness distribution model, and calculating additional tension of the bolt; respectively calculating axial tensile stress of the bolt and shear stress of the bolt by adopting an area uniform stress method; and calculating equivalent stress of the bolt by adopting a shear strain energy equivalent method; calculating a safety factor of the bolt by adopting an equivalent stress safety margin method, comparing the safety factor with a preset safety threshold, and outputting a corresponding bolt strength grade. Additional tension is dynamically distributed according to the stiffness of the bolt and the connected part, so that the force transmission characteristics are closer to actual bearing; the pitch correction nominal diameter is introduced, so that the actual stress distribution of the thread root is more accurately described; and the equivalent stress is calculated by the shear strain energy equivalent method, so that the yield criterion of the plastic material is more in line with the yield criterion.

An article of footwear includes a sole structure having a plate, a first foam layer, and a second foam layer. The first foam layer overlies the panel and has a distal side that interfaces with the proximal side of the panel. The second foam layer is located below the panel and has a proximal side that interfaces with the distal side of the panel. The compression stiffness of the first foam layer is greater than that of the second foam layer. A compressive stiffness of the panel is greater than a compressive stiffness of the first foam layer.

This utility model discloses a wear-resistant and antistatic PP sheet, relating to the field of PP sheet technology. It includes a substrate with structural grooves on its inner wall, a metal-carbon composite inner layer mounted on its outer wall, a wear-resistant composite surface layer mounted on the outer wall of the metal-carbon composite inner layer, and a wear-resistant frame mounted on the outer wall of the wear-resistant composite surface layer. The side walls of the wear-resistant frame have weight-reducing grooves. This utility model utilizes the substrate, structural grooves, and metal-carbon composite inner layer. The structural grooves are formed by an array of equilateral triangles with equal spacing. Triangles are the most geometrically stable structure, and their rigid connections between sides and corners effectively resist deformation, suppressing overall substrate bending and improving compressive stiffness. Simultaneously, the metal-carbon composite inner layer, composed of copper powder, graphene, carbon black, and other materials, forms a conductive network that conducts internal static electricity, achieving an antistatic effect.

A paperboard winding tube of enhanced compression stiffness and resistance to deformations leading to ovality under gravity type loading is disclosed. The paperboard winding tube may include a cylindrical body wall formed from a plurality of structural paperboard layers with at least one central structural paperboard layer disposed between at least one radially inward structural paperboard layer and at least one radially outward structural paperboard layer. The radially inward and the radially outward structural paperboard layers may be formed of a paperboard ply of a first stiffness, and the central structural paperboard layer may be formed of a paperboard ply of a second stiffness that is less than the first stiffness. The arrangement of the plurality of structural paperboard layers increases the compression stiffness of the paperboard winding tube to resist deformations leading to ovality of the cylindrical body wall under gravity type loading of the paperboard winding tube.

The invention relates to a flexible helical gear time-varying meshing stiffness calculation method considering a center distance, and belongs to the technical field of mechanical dynamics. The method comprises the steps that a bevel gear is sliced in the axial direction, and a sliced gear is equivalent to a straight gear; acquiring a time-varying pressure angle of a pitch circle under the condition that the meshing contact line of the straight gear changes along with the center distance; based on the time-varying pressure angle, a time-varying meshing contact line of the single tooth of the helical gear in one period is obtained, so that five sub-rigidities of the time-varying meshing rigidity of the single tooth of the helical gear are obtained, and the five sub-rigidities comprise bending rigidity, radial compression rigidity, shearing rigidity, matrix rigidity and gear Hertz contact rigidity; and accumulating and summing the meshing stiffness of each meshing point on the contact line to obtain the single-tooth time-varying meshing stiffness of the bevel gear in one meshing period, and superposing the single-tooth time-varying meshing stiffness of the bevel gear in the meshing plane direction of the bevel gear to obtain the total time-varying meshing stiffness of the bevel gear. The method aims at improving the calculation precision of the time-varying meshing stiffness of the bevel gear and reducing the calculation time cost.

The application provides a compression-torsion coupling impact-resistant damping superstructure design method, comprising the following steps: creating two different compression-torsion units capable of realizing directional torsion under compression load through the layout of a two-dimensional chiral lattice in a three-dimensional space; analyzing the stress state of the unit under loading, simplifying the mechanical loading model of the obtained compression-torsion coupling unit, and selecting an analysis coordinate system; based on the small deformation assumption, the compression stiffness and compression-torsion coupling coefficient of the unit are derived through the energy method; analyzing the competitive relationship between the compression stiffness and the damping stiffness of the structure, and selecting the best design parameters in combination with the lightweight index; layer-by-layer designing the unit arrangement mode of the compression-torsion coupling core layer structure to form a specific Poisson's ratio compression-torsion core layer structure; combining the impedance mismatch method to design the front and rear panels, assembling the obtained core layer and panels to form a composite sandwich structure. The application effectively enhances the deformation capacity and impact energy absorption efficiency of the material, and improves the vibration control performance.

The invention relates to the technical field of aluminum profiles, and discloses a light-weight aluminum profile based on local reinforcement, which comprises an aluminum profile main body, a cavity is integrally formed in the aluminum profile body, loading grooves are formed in the top side and the bottom side of the aluminum profile body, two reinforcing blocks are symmetrically installed in the aluminum profile body in the length direction of the aluminum profile body, the two reinforcing blocks are located on the adjacent sides of the two loading grooves respectively, and a rhombic reinforcing piece is fixed between the two reinforcing blocks. Inclined supporting pieces fixed to the inner walls of the two sides of the aluminum profile body are installed on the two sides of the two reinforcing blocks correspondingly, and ventilation assemblies are installed on the two sides of the aluminum profile body correspondingly. The reinforcing blocks, the rhombic reinforcing pieces, the inclined supporting pieces and the elastic assemblies are arranged in the aluminum profile body, the steel balls are used for locking deformation, the inclined supporting pieces are used for dispersing stress, the elastic assemblies buffer external force and transmit gas to enhance supporting, and the compressive rigidity and deformation resistance of the aluminum profile under the extreme snow load and complex stress conditions are improved; and a dynamic enhanced supporting system is formed.

The invention relates to the technical field of metamaterial design, in particular to a novel mixed-gradient double-arrow negative Poisson's ratio structure and application, the novel mixed-gradient double-arrow negative Poisson's ratio structure comprises a plurality of mutually connected cell elements, and each cell element comprises an arrow part, an arch part and a vertical rib plate; the arrow part is arranged to be a combination of the first concave arrow and the second concave arrow, the arch part is arranged in the arrow part, the vertical rib plates are arranged on the two sides of the arrow part respectively to form complete cell elements, and the negative poisson ratio structure is in a unique deformation mode under in-plane crushing load through mutual connection of the complete cell elements. The cell elements transversely contract and gather towards the core until complete densification is achieved, mixed gradient design is conducted on the thickness of the double-arrow cell walls and the thickness of the arched cell walls, so that the cell walls can present a more reasonable deformation mode in the compression process, the bearing capacity of the structure in the compression process is improved, and it is guaranteed that the comprehensive mechanical property of the whole structure is effectively improved; the problem that in the prior art, a negative Poisson's ratio structure is poor in compression rigidity and energy absorption capacity is solved.

To provide a method for manufacturing a seat pad capable of suppressing a crush of a flow path when manufacturing a seat pad.SOLUTION: A method for manufacturing a seat pad includes: a pad body forming step for forming a pad body made of resin foam where recesses are formed on a reverse surface; and a reinforcement body insertion step for inserting a reinforcement body whose compression rigidity in a pad thickness direction is greater than the pad body in the recesses of the pad body. The pad body partitions ventilation holes succeeding from bottom surface of the recesses to the surface of the pad body. The reinforcement body contacts the bottom surface of the recesses, supports the bottom surface from the pad reverse side, and partitions inside communication holes communicating with the ventilation holes.SELECTED DRAWING: Figure 5B