18 results about "Vertical stiffness" patented technology

The invention discloses a design method of an integral swing self-resetting structure for mounting a tension-compression energy-dissipation support, and relates to the technical field of civil engineering earthquake resistance, and the integral swing self-resetting structure comprises a tensile limiting device and a compression limiting device; the method specifically comprises the steps that a structural mechanical model is established, and the lateral stiffness of a traditional fixed foundation is calculated; setting a rigid body displacement ratio to determine the vertical and horizontal rigidity and strength of the support; carrying out finite element push-and-cover analysis to verify a rigid body displacement ratio; setting an additional damping ratio; carrying out seismic response spectrum analysis on the vertical seismic isolation structure; calculating the vertical natural vibration period of the structure and adjusting the rigidity according to the response spectrum; carrying out elastic-plastic time-history analysis to detect an interlayer displacement angle, acceleration and structural damage; checking the consistency of the additional damping ratio and the actual energy consumption; and finally, anti-overturning checking calculation under extremely rare earthquake is carried out to ensure that the support and the limiting device are in an elastic state. The energy dissipation capacity and anti-seismic safety of the structure can be effectively improved, and the structure is suitable for various building structures needing vertical and horizontal seismic isolation.

The application provides a method for determining the longitudinal wave velocity after fluid replacement in an anisotropic medium and related equipment. The method comprises the following steps: determining an average bulk modulus based on a matrix bulk modulus; determining a first bulk modulus when the medium contains fluid based on first property data; determining a second bulk modulus when the medium does not contain fluid based on the first property data, the matrix bulk modulus, the average bulk modulus and the first bulk modulus; determining a second vertical stiffness coefficient when the medium does not contain fluid based on the first property data, the average bulk modulus, the first bulk modulus and the second bulk modulus; obtaining second property data of each predetermined replacement fluid; and determining the longitudinal wave velocity after the fluid in the medium is replaced by the predetermined replacement fluid based on the first property data, the average bulk modulus, the second bulk modulus, the second vertical stiffness coefficient and the second property data. The technical problem that the longitudinal wave velocity determined after fluid replacement in an anisotropic medium is not accurate in the prior art is solved.

The present application relates to a kind of multi-foot coupling spoke and tire for non-pneumatic tire, spoke includes first leg structure, second leg structure and third leg structure, first leg structure and second leg structure are connected in V type, third leg structure is connected in V type with second leg structure, the end of third leg structure is equipped with first coupling surface, second coupling surface is equipped with in the opposite side surface of second leg structure with the side of third leg structure, first coupling surface can coincide with second coupling surface in translation process.The third leg structure of present application is arranged, and the third leg structure is coupled and connected with second leg structure, realizes circumferential coupling arrangement, substantially reduces the stress of originally bearing tension side, avoids interface and rubber body due to repeated tension and leads to the failure of adhesive surface, such as rubber fatigue tear phenomenon.The multi-foot coupling spoke improves the vertical stiffness of spoke, enhances the carrying capacity, further improves its carrying stability.

The invention discloses a vertical vibration reduction and isolation spherical steel support and a vibration reduction method, the vertical vibration reduction and isolation spherical steel support comprises an upper support plate, a spherical crown lining plate, a lower support plate, a vertical vibration reduction mechanism and a bottom basin, the spherical crown lining plate is arranged between the upper support plate and the lower support plate, the upper support plate covers the lower support plate, and the lower support plate is embedded in the bottom basin; the vertical vibration reduction mechanism is arranged between the lower seat plate and the bottom basin, the top of the vertical vibration reduction mechanism abuts against the bottom of the lower seat plate, the bottom of the vertical vibration reduction mechanism abuts against the bottom basin, and therefore the special-shaped metal springs conduct vertical vibration reduction on the upper seat plate, the spherical crown lining plate and the lower seat plate. The two special-shaped metal spring sets which are symmetrically stacked in groups are additionally arranged on the basis of a common spherical steel support, vertical elastic deformation generated when the support bears a vertical load is greatly increased, the vertical rigidity of the support can be effectively reduced, and therefore the inherent frequency of the support is reduced, and the service life of the support is prolonged. The dominant frequency generated by vibration of the upper structure of the support is isolated from the inherent frequency of the structure of the support, so that the vertical vibration reduction and isolation function of the whole support is achieved.

The application discloses a kind of measurement methods of tire lateral inclination working condition vertical stiffness, including the parameter setting of vertical stiffness test in tire static stiffness testing machine, the parameters include tire pressure, vertical load and displacement loading speed;When tire lateral inclination angle γ is 0, tire vertical stiffness test is carried out, and the radial force F r of tire is collected during measurement test process and the relationship curve of with subsidence amount ρ, and the radial force F r Of tire is collected during measurement test process and the relationship curve of with subsidence amount ρ;When tire lateral inclination angle γ is not 0, tire vertical stiffness test is carried out, and the test data of different lateral inclination angle during measurement test process are collected, and the test data include radial force F r , lateral force F s And subsidence amount ρ;According to the test data obtained in step S3, the tire model formula constructed is input, and the tire vertical stiffness under each lateral inclination angle is calculated.The application designs tire model, deduces tire vertical stiffness under lateral inclination working condition, to realize accurate measurement of tire vertical stiffness under lateral inclination working condition.

This invention provides a footwear product suitable for diabetic foot. The midsole is composed of multiple unit cell lattice structures arrayed simultaneously in the vertical, horizontal, and longitudinal directions. The vertical direction is consistent with the thickness direction of the midsole, while the horizontal and longitudinal directions are orthogonal to each other and parallel to the plane of the midsole. Each unit cell lattice structure consists of a cube structure, two rectangular structures, four rhombus structures, and five support rods. The two rectangular structures, four rhombus structures, and five support rods are all arranged within the cube structure. The long sides of the two rectangular structures form the diagonal sides of the vertical end face of the cube. A support rod coincides with the intersection line of the two rectangular structures to divide the two rectangular structures into four orthogonally intersecting rectangular faces. The midpoints of the four sides of each rectangular face form the four endpoints of the rhombus structure. The line connecting the two vertical endpoints of each rhombus structure coincides with a support rod, which allows the vertical stiffness of a local area of ​​the midsole to be adjusted by changing the diameter of the support rod.

The application discloses a primary suspension system and a railway vehicle, which comprises a framework, an axle box body arranged on the inner side of a side beam of the framework, a rubber node assembly connected between the top of the axle box body and the framework, used for providing longitudinal and transverse positioning stiffness and releasing vertical stiffness, two steel spring assemblies connected between the top of the axle box body and the framework, and the two steel spring assemblies are respectively arranged on the two sides of the rubber node assembly along the longitudinal direction, used for providing vertical stiffness, and a positioning pull rod connected between the bottom of the axle box body and the framework, used for providing longitudinal stiffness and releasing vertical stiffness and transverse stiffness. The vertical stiffness, the transverse stiffness and the longitudinal stiffness are decoupled, the stiffness in the vertical direction, the longitudinal direction and the transverse direction is respectively realized independently, the primary suspension system has sufficient wheelset axle box positioning stiffness and small vertical stiffness, the critical speed and the ride comfort of the vehicle are ensured, and the high-speed stability and the smoothness requirement of the vehicle are met.

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 high-speed train suspension parameter evaluation method which combines a particle Markov chain Monte Carlo model, a Kriging model and a particle swarm optimization algorithm. According to the method, firstly, based on a vehicle vertical six-degree-of-freedom dynamical model, a PMCMC algorithm is used for carrying out preliminary evaluation on suspension parameters; then, key suspension parameters, namely, the vertical stiffness of a primary spring and the vertical stiffness of an air spring, serve as design variables, the Pearson's correlation coefficient of the vertical acceleration power spectral density of the simulation and actual measurement vehicle body serves as output, and a Kriging proxy model is constructed; meanwhile, with the purpose of minimizing simulation and actually-measured vertical acceleration PSD errors of a vehicle body, key suspension parameters matched with the actual service state are obtained through a PSO algorithm. And taking the obtained key parameters as prior information of a PMCMC algorithm, and taking actually measured vibration data of the train as an observation value to complete posteriori estimation of the suspension parameters.

According to an embodiment of the present invention, an improved seismic isolation design method utilizing nonlinear time-history analysis based on vertical stiffness linked to horizontal displacement comprises a preliminary design stage and an analysis and review stage, wherein, in the analysis and review stage, vertical stiffness is calculated according to Equation 1 during nonlinear time-history analysis of a seismic isolation device–structure system with respect to horizontal and vertical vibrations, by considering a vertical load-resisting cross-sectional area that decreases according to horizontal displacement of a seismic isolation device, wherein, in Equation 1, Kv denotes vertical stiffness, Ec denotes a composite elastic modulus of rubber, A0 denotes the total cross-sectional area, nr denotes the number of rubber layers, tr denotes the thickness of one rubber layer, and Tr denotes the total thickness of the rubber layers.

The invention discloses a railway fastener system rigidity optimization design method for reducing steel rail side abrasion. The method comprises the steps that a vehicle-rail coupling dynamic model is established, analogue simulation is conducted, and a plurality of wheeltrack transverse force time travel curves and railhead transverse movement time travel curves when a train passes under the condition of different rigidities are obtained; establishing a relation curve of the wheel rail transverse force and the fastener vertical rigidity and a relation curve of the rail head transverse movement and the fastener vertical rigidity; obtaining a changing curve of the transverse force of the outer steel rail and the wheel rail along with the vertical rigidity of the fastener and a changing curve of the gauge enlargement along with the vertical rigidity of the fastener; and normalizing to the same coordinate system, and taking the fastener vertical rigidity corresponding to the intersection point of the two change curves as the optimized elastic backing plate rigidity. The method is used for solving the problem that in the prior art, the development speed of steel rail head side grinding is high, and consequently the maintenance and repair workload is large, and the purposes that the occurrence and development speed of steel rail side grinding is reduced by optimizing the rigidity of the fastener system, and the maintenance and repair workload is reduced are achieved.

This invention discloses a high-position lat pulldown strength trainer, relating to the technical field of strength training devices. It includes an adaptive mechanism mounted on top of a weight block support. The adaptive mechanism includes a fixed rod fixedly mounted on the top of the weight block support, with a movable pulley assembly at the end of the fixed rod away from the weight block support. By setting up the adaptive mechanism and a pair of movable pulley assemblies, each connected via a corresponding rotating shaft, the movable pulley assemblies can swing left and right according to the direction of force on the steel cable. This makes the user's pulldown trajectory no longer rigidly vertical, but rather an ergonomic arc movement centered on the shoulder. Furthermore, the split-motion design allows users to perform single-arm training or alternating training, correcting left-right muscle imbalances.

The invention discloses a vertical shear stiffness quantitative identification and safety monitoring evaluation method for a new and old widened bridge joint, and belongs to the field of bridge engineering safety detection and structural performance monitoring. The invention relates to a method for identifying the rigidity of an abutted seam of a widened bridge, which is characterized in that under the excitation of a low-speed vehicle load, the ratio of response time cumulants of quasi-static displacement generated in the midspan of a new bridge and an old bridge and the vertical rigidity of the abutted seam connecting the two have a clear and stable mathematical mapping relationship; and a stable and reliable dimensionless identification index which is directly associated with the abutted seam rigidity is constructed, so that quantitative evaluation of the health state of the abutted seam is realized. The invention discloses a new and old widened bridge joint safety assessment method. The method comprises the following steps: step 1, arranging a new and old widened bridge joint structure performance monitoring system; 2, deploying a signal processing module and a parameter calculation and state evaluation module in a background; and step 3, deploying a display and monitoring early warning module on a client, wherein a manager can see the content of the display and monitoring early warning module.

The invention discloses a stability control method for continuous reconstruction motion of a metamorphic robot based on nonlinear analysis, which comprises the following steps of: 1, establishing a continuous reconstruction kinematics model of the metamorphic robot by using a spinor theory so as to obtain homogeneous coordinates of centroids of all motion components; 2, establishing a pitch angle-vertical displacement two-degree-of-freedom nonlinear vibration model for continuous reconstruction of the metamorphic robot, and deducing an improved ZMP criterion containing foot wheel nonlinear vertical stiffness; and 4, converting the complex continuous reconstruction nonlinear dynamic model of the metamorphic robot into a simple linear system model for adjusting a centroid mechanism through a sliding block expected displacement deviation solver, and further converting the motion control of each leg joint with continuous reconstruction stability into the displacement control of a sliding block in the centroid mechanism. Therefore, stability control over the metamorphic robot in the continuous reconstruction process is achieved through the LQR controller optimized based on the artificial bee colony algorithm.

The utility model discloses an air spring with the ratio of transverse rigidity to vertical rigidity larger than 1, which comprises a bag skin, an upper cover and a piston which form a closed cavity, the closed cavity is filled with gas with set pressure so as to enable the bag skin to expand, the periphery of the upper cover is connected with an outer sleeve part, and the outer sleeve part extends vertically and wraps the outer side wall part of the bag skin. The air spring is provided with the outer sleeve piece, the air spring generates transverse rigidity through the interaction force between the outer sleeve piece and the expansion bag skin, the transverse rigidity of the air spring can be adjusted by adjusting the vertical height of the outer sleeve piece, and then the ratio of the transverse rigidity to the vertical rigidity of the air spring is larger than 1. The transverse stroke and the vertical stroke of the air spring are both large, rigidity sudden change does not exist in the operation process, and the overall stability is good. The air spring is simple in overall structure and low in production cost, the fatigue life of the bag skin of the air spring can be prolonged through shape optimization of the outer sleeve piece, and reliability is improved.

This invention belongs to the field of engineering construction, specifically relating to a triangular truss support system for concrete beams and slabs. It aims to solve the problems in related technologies where the use of a single circular steel pipe for vertical load-bearing components leads to insufficient load-bearing capacity and overall stability, resulting in increased material consumption, poor adaptability to working conditions, and reduced construction efficiency. This triangular truss support system for concrete beams and slabs includes vertical load-bearing units. Each vertical load-bearing unit has three vertical steel pipes passing through it on any horizontal cross-section. These three vertical steel pipes are parallel to each other and arranged in a triangle on the cross-section. Multiple transverse connecting structures are arranged at equal intervals along the height direction to fix the three vertical steel pipes together as a whole. By continuously constraining the relative displacement between the vertical steel pipes under vertical loads through the transverse connecting structures, the buckling tendency under compression is suppressed, thereby enabling the three steel pipes to cooperate stably in bearing the load. This improves vertical stiffness and resistance to critical instability loads without increasing the cross-sectional size of a single pipe.

The application discloses a live load vertical deformation determination method for a suspension bridge with a horizontal cable and a central buckle, which comprises the following steps: 1, a central buckle is added; 2, a basic linear shape of a main cable under dead load considering bending stiffness is determined; 3, equivalent spring stiffness of side cables and the central buckle is calculated; 4, a main cable compatibility equation is established; 5, a deflection and beam end rotation angle analytical expression is established; 6, an unknown coefficient function is established; 7, a horizontal increment of the main cable on both sides of the central buckle caused by live load is solved; and 8, deflection and beam end rotation angle are solved. The application can greatly improve the vertical stiffness of the suspension bridge without changing the stress of the stiffening beam, so that the suspension bridge has stronger crossing capacity. The contribution of the central buckle to the overall vertical stiffness of the suspension bridge can be quickly evaluated, and the mechanical principle of the central buckle in the suspension bridge is described in an analytical way. The application is convenient to use, accurate and reliable in result, and can be used for suspension bridge structure analysis and preliminary design.

This invention discloses a multifunctional device and method for testing the compressive and shear properties of large-diameter crushed stone. The multifunctional device includes an experimental platform, a reaction frame structure positioned above the experimental platform, a vertical loading mechanism and a horizontal loading mechanism mounted on the experimental platform and the reaction frame structure, and a test device box placed on the experimental platform. Large-diameter crushed stone ballast material is placed in the test device box. Vertical forces are applied to it through the vertical loading mechanism, and shear forces are applied through the horizontal loading mechanism, conducting direct shear tests, vertical stiffness tests, and / or triaxial tests to test the compressive and shear properties of the large-diameter crushed stone ballast material. Overall, this invention, by integrating multiple functions and advantages, can provide more accurate and effective evaluation information to complete the mechanical property testing of large-diameter crushed stone ballast material, successfully overcoming the problems and limitations of existing ballast material mechanical property testing devices, and has good practical value.