82 results about "Compression load" patented technology

The invention belongs to the technical field of computer aided design and structural design, and discloses a multi-scale lattice structure and a design method thereof. The design method comprises the following steps: S1, designing a cubic unit cell with eight symmetrically distributed corner nodes according to a cubic lattice structure; s2, all the lattice unit cells are zoomed, one part of the lattice unit cells are zoomed into small lattice unit cells with the size being half of the original size, and the other part of the lattice unit cells are large lattice unit cells with the original size reserved; s3, in the macroscopic lattice structure, arranging the position relation of the small lattice unit cells and the large lattice unit cells; and S4, through a computer aided design method, adjusting the macroscopic lattice structure by adopting a large and small lattice unit cell connection mode based on rod diameter transition. A multi-scale large and small lattice unit cell arrangement mode is introduced into the lattice structure, so that the lattice structure has better mechanical performance under the same compression load.

The invention relates to the technical field of shield tunnel reinforcement, and particularly discloses a foundation correction unit and a monitoring correction device for shield tunnel segments. The basic correction unit is composed of a duct piece support and a sliding rail base and is fixed to the surface of a duct piece in a lossless mode through a vacuum suction cup. The monitoring and correcting device is formed by connecting a plurality of annular correcting units and / or longitudinal correcting units, and the annular / longitudinal correcting units are formed by connecting basic correcting units and bidirectional force application rods and are integrated with monitoring sensors. The monitoring and correcting device is also provided with an automatic control system which comprises a data acquisition module and a servo module, the data acquisition module acquires monitoring data of the displacement sensor, the angle sensor and the vacuum gauge in real time, the servo module resolves the monitoring data in real time and generates a control instruction, and the suction force of the suction cup and the tension and compression load of the hydraulic oil cylinder are dynamically adjusted. And active correction of duct piece deformation and structural stability control are achieved. The tunnel deformation development can be effectively inhibited while the structural integrity of the duct piece is guaranteed.

The application relates to a compression-shear composite loading system based on a pulley system multi-point mean loading, and relates to a compression-shear composite loading system. In order to solve the problem that the traditional compression-shear composite loading is prone to uneven shear flow for a large-size composite stiffened wall plate structure, the application applies uniform compression loads to the side end surface loading end of a test piece through compression actuating cylinders and a flat pressing plate; two shear actuating cylinders output leftward shear loads along the upper end surface of the test piece; and the other two shear actuating cylinders output rightward shear loads along the lower end surface of the test piece; the loads are converted in direction through a pulley assembly and finally act on the shear plates on the upper and lower sides of the test piece. The application realizes the test under different compression-shear ratios by simultaneously adjusting the sizes of the compression and shear actuating cylinder forces, and optimizes the problem of uneven shear loading through the multi-point coordinated loading system, so that the shear of the measuring point is uniform, and the strength test of the large-size stiffened wall plate structure can be better satisfied.

The present invention proposes an assembled axial and eccentric reciprocating tension-compression test device and test method suitable for structural members, which belongs to the field of building structure technology. It solves the problem that existing test devices can only realize monotonic compression or monotonic tension conditions, and cannot realize reciprocating tension-compression test loading. The present invention mainly includes a loading device connection part, a test member connection part and a test member. The present invention effectively avoids the problems of premature damage to the ends of structural members and insufficient transmission of tension-compression loads during reciprocating tension-compression loading, ensures the effective transmission and conversion of tension-compression loads in metal tube-concrete composite members, and adjusts the position of the tension-compression rotating shaft through the eccentricity adjustment shaft. The present invention can apply tension-compression reciprocating loads of arbitrary eccentricity to structural members, adopts assembled mechanical connection, and the test device assembly operation is convenient, which can realize rapid installation and rapid replacement of test members and loading devices, reducing the extra workload during the test process.

The application relates to a structure lightweight design method based on a modified equivalent static load method, which comprises the following steps: step 1, establishing a finite element model of an initial structure to be optimized, and calculating linear equivalent static loads; step 2, calculating modulus proportionality coefficients of a plastic deformation stage of the structure to be optimized; step 3, modifying the equivalent static loads of the structure according to the calculated modulus proportionality coefficients; and step 4, carrying out nonlinear topology optimization according to the modified equivalent static loads to obtain an energy-absorbing point lattice cell configuration, and realizing structure lightweight design. The application is based on a material and geometric nonlinear numerical modified equivalent static load method, the equivalent static load method is modified through modulus proportionality coefficients and strain matrix correction coefficients, nonlinear topology optimization of the structure is realized, a three-dimensional model of the point lattice cell configuration is reconstructed according to an optimization result, a geometric parameterized model of the energy-absorbing point lattice cell configuration is obtained, and the model is used for lightweight design of the point lattice structure under a compression load working condition.

Systems provide load redistribution and reduced stress at otherwise highly loaded threads. A system for a threaded connection includes a shaft that rotates about an axis. The shaft is a hollow cylinder with an inner surface and a wall defined around the inner surface. A fastener is in threaded engagement with the shaft. The fastener applies a compressive load holding the shaft under a tensile load. The threaded connection extends from a loaded end adjacent a place of application of the compressive load, to an unloaded end opposite the loaded end. The inner surface has a contour, and the wall has one thickness at the loaded end and another greater thickness at the unloaded end, so the wall has more compliance at the loaded end as compared to at the unloaded end to reduce a stress resulting from the load and redistributing stress throughout the threaded connection.

The invention belongs to the technical field of bearings, and discloses a foil dynamic pressure radial gas bearing bump foil creep test method, which is characterized in that a miniature rubber block is inserted between a top foil and a rigid substrate, and the miniature rubber block is used as a flexible element, is in direct contact with the top foil, and deforms under the action of a compression load transmitted by the top foil; a monocrystalline silicon semiconductor strain gauge is pasted on the side face of the miniature rubber block, and the direction is perpendicular to the direction of the compression load; in the running process of the bearing, the output strain value of the strain gauge is monitored in real time through a data acquisition system; the semiconductor strain gauge is a sensitive element manufactured based on the piezoresistive effect of semiconductor monocrystalline silicon, the resistivity of a semiconductor crystal material is changed when the semiconductor crystal material is stressed in a certain direction and deforms, and strain, stress and the like are indirectly measured. The device has the beneficial effect that the problem that the creep strain is difficult to test in real time due to the tiny structure of the bump foil is solved.

The application provides a lattice structure modeling method under tensile and compressive load conditions and a derived lattice structure, and realizes lattice structure design under tensile and compressive load conditions. The method comprises the following steps: designing an original solid cell structure; performing generative topological optimization on the original solid cell to obtain a lattice topological configuration under multi-directional uniform tensile load and unidirectional dominant tensile load conditions; reconstructing the lattice structure obtained by the generative topological optimization; evaluating the manufacturability of the reconstructed lattice structure; performing derivative design on the reconstructed lattice structure to improve the manufacturability and bearing capacity thereof; and after the design is completed, preparing a corresponding lattice structure and performing performance testing. The application designs a lattice structure under tensile and compressive load conditions, and reduces the performance difference between the actual manufacturing structure and the design structure through structural adjustment, so that the obtained lattice structure has higher lightweight degree, specific stiffness and specific strength, and can be widely used in the fields of automobiles, aerospace and the like.

If, in a virtual plane orthogonal to a drive axis (X1), a midpoint (MP) between the center of a drive-side base circle (34) and the center of a driven-side base circle (44) is defined as a working point of compression loading generated in the radial direction of the drive axis (X1), a direction orthogonal to a virtual line (VL) connecting two contact points, constituted of a first contact point (P1) and a second contact point (P2), at which a side surface of a driving spiral (33) and a side surface of a driven spiral (43) contact at an outermost circumferential side is defined as the loading direction (LD) of the compression loading, and the range over which the loading direction (LD) fluctuates during one revolution of a drive scroll (30) is defined as a fluctuation range (FR), a stator (13) defines a fixed axis (FX) inside a housing (60), the drive axis is defined by a rotor (14) and is set so as to separate from the fixed axis (FX) in the loading direction (LD) included in the fluctuation range (FR) when not actuated, and so as to match or approach the fixed axis (FX) when actuated.

A system for providing a load on a bearing mounted to a shaft includes an attaching member releasably connectable to the shaft and a press mechanism in fluid communication with a source of fluid and configured to provide a compressive load to the bearing. The press mechanism includes a switch having a base and a piston in communication with the fluid such that an increase in a pressure of the fluid results in the piston extending upwardly from the base and a decrease in the pressure of the fluid results in the piston retracting toward the base. The switch includes a lower proximity sensor and a higher proximity sensor. The piston is configured to extend upwardly from the base past the lower proximity sensor and to trip the higher proximity sensor. The switch is configured to control the increase in the pressure in response to the piston tripping the higher proximity sensor.

The invention relates to the technical field of metamaterial lattice structures, in particular to a construction method of a mixed positive and negative Poisson's ratio structure. According to the method, a lattice structure is constructed based on a plurality of FCC, then the lattice structure and a 3D RH structure are fused to form a new concave lattice structure, and the structure solves the problems that an existing negative Poisson's ratio structure is large in plastic section stress fluctuation and low in platform stress under compression loads, so that the energy absorption performance of the negative Poisson's ratio structure is improved, and the energy absorption performance of the negative Poisson's ratio structure is improved. The invention discloses a mixed positive and negative Poisson's ratio structure constructed by the method, a metamaterial comprising the structure and a preparation method of the metamaterial.

The application provides a metal energy-absorbing thin-walled pipe with a negative Poisson's ratio effect and a design method thereof, comprising a thin-walled pipe body, the thin-walled pipe body is composed of a plurality of unit bodies which are sequentially fixedly connected in a head-to-tail mode from top to bottom, each unit body comprises a pipe and a joint which are fixedly connected, the joint is fixed at the bottom of the pipe, and the wall thickness of the pipe is greater than the wall thickness of the joint. In the technical scheme, the thickness of the metal pipe and the connected joint is inconsistent, the thickness of the metal pipe is greater than the thickness of the connected joint, the metal pipe has better bending strength than a conventional metal pipe with the same thickness when subjected to a bending load, is not prone to deformation and bending when subjected to the same load, and the structure has a negative Poisson's ratio effect when subjected to compression, the metal pipe is shortened in the longitudinal direction and shrinks in the transverse direction when subjected to a compression load, is more prone to densification, and has a better energy-absorbing effect than a conventional metal pipe.

The invention discloses a forging part crack measuring mechanism, and belongs to the technical field of crack measurement. The forging part crack measuring mechanism comprises a machine body and a measuring instrument, a load block is slidably connected to the outer wall of a limiting block, the load block and a supporting block are each provided with a fixing assembly used for being connected with a forging part, and a driving assembly used for driving the load block to slide is arranged on the outer wall of the machine body. The compression load or the tensile load can be controlled to be applied to the forging part through the position relation between the protruding part and the connecting part, and the crack change of the forging part is obtained in real time in cooperation with the measuring instrument; the safety block and the safety ring can be collapsed, so that pulling force and pressing force are reduced, core components such as a crankshaft are protected against damage, meanwhile, the fixing assembly can be driven to work through the pressing force of the load block, automatic fixing of the forging part is achieved, and when fixing of the forging part is relieved, only a hand wheel needs to be pulled and rotated.

The application belongs to the technical field of aircraft structure design, and particularly relates to a method for predicting a compression damage region of a composite stiffened panel in an aircraft structure, comprising the following steps: step one, screening important related parameters related to the compression damage of the composite stiffened panel; step two, determining the value range of the important related parameters, sampling and constructing a sample set; step three, constructing a finite element model of the composite stiffened panel, and calculating the damage position of each sample in the sample set under compression load; step four, dividing the composite stiffened panel into multiple regions, and corresponding the damage position of each sample in the sample set under compression load to the corresponding region; step five, based on the corresponding region of each sample in the sample set, constructing a compression damage region prediction model of the composite stiffened panel; and step six, taking the important related parameters as input, and based on the compression damage region prediction model of the composite stiffened panel, calculating the damage region of the composite stiffened panel under compression load.

A force transducer capable of measuring tension and / or compression loads, including a generally rectangular flexure body made of high modules of elasticity material having through cuts that divide the body into an S shaped force transmission path. Strain gages are strategically located on the inside surfaces of a central opening and are connected into a bridge circuit mounted on a printed circuit board which is integrally attached to said body. Printed circuit means are provided for conditioning and transmitting signals from the bridge circuit either through hardwiring or wirelessly. A battery powered embodiment is described. Various configurations of covers for the device are shown.

The invention relates to a multidirectional fatigue test system based on multi-axis dynamic coupling and an intelligent cooperative loading method. The multidirectional fatigue test system comprises a test bench; a lifting platform; the tension and compression test system is used for applying tension and compression load to the test piece; the multi-direction bending test system comprises a Y-direction bending test system arranged on the side edge of the test area in the Y direction and a Z-direction bending test system arranged on the lifting table in the Z direction; the torsion test system is used for applying a torsion load to the test piece; the slidable support clamp device is mounted at the first end of the test area and has certain X-direction sliding capacity; the fixed support clamp device is mounted at the second end of the test area; the invention discloses an intelligent collaborative loading regulation and control device. The tension and compression testing machine, the multidirectional bending testing machine and the torsion testing machine are adopted to couple tension and compression, bending and torsion loads through the intelligent cooperative loading regulation and control device, dynamic cooperative loading is achieved, meanwhile, the crack propagation path is pre-judged, and the loading position of the bending testing machine is regulated and controlled in real time.

The utility model discloses a compression test device for composite material thin-walled structure sample piece, including: clamps, anti-instability baffle and compression loading structure, the clamps are divided into two groups, are arranged at interval and are used for clamping the two side edges of the sample piece, each group of clamps comprises two support frames and two clamping plates, the two clamping plates in each group of clamps are respectively connected to the opposite sides of the two supporting frames in the group of clamps, and the opposite end surfaces of the two clamping plates in each group of clamps and the front and rear end surfaces of the corresponding side edges of the sample piece are designed in a shape following manner; the anti-instability baffles are correspondingly attached to the front portion and the rear portion of the sample piece, the two ends of each anti-instability baffle are connected with the two clamps respectively, and the compression loading structure is located over the position between the two clamps and used for applying compression loads to the sample piece. According to the compression test device, effective clamping of the sample piece can be guaranteed, instability and deformation of the sample piece in the compression process can be prevented, and the precision and reliability of a compression test are guaranteed.

Provided is a paper plug having a filler and an inner plug wrap in which the filler is wound, wherein the hardness of the paper plug in a direction perpendicular to a long axis represented by formula (1) is 70.0% or greater.　Formula (1): Hardness in direction perpendicular to long axis (%) = (Dd / Ds) × 100 (In formula (1), Ds (mm) is the diameter of a cross-section in a direction perpendicular to the long-axis direction of the paper plug before a load F is applied, Dd (mm) is the diameter of a cross-section in a direction perpendicular to the long-axis direction of the paper plug when the load F is applied, and the load F is a load applied to the paper plug under conditions such that the compression load applied in the direction perpendicular to the long axis of the paper plug is 3N, the head diameter of a pressurizing jig is φ12 mm, and the compression time is 10 seconds.

The application discloses a soft sealing frictionless ball valve intelligent adaptive control method, and relates to the technical field of valve control, which comprises the following steps: in step one, a perturbation is superimposed on the seat section to determine the instant of the contact seat by judging the residual point of the stiffness mutation and the non-contact stroke reference curve, and the position of the contact seat and the local stiffness are output; in step two, the pressure difference, temperature and seat ring material are collected, the minimum necessary compression load is calculated, and the upper limit of the allowable torque-angle curve is generated; in step three, the smooth closing trajectory is executed with the position of the contact seat as the starting point, the minimum necessary compression load is reached under the amplitude limitation, and the process is stopped, and the contact energy and sealing confirmation are recorded; in step four, the breathing type pressure maintaining is implemented in the maintaining stage, the seat ring health index is formed, and the material-temperature correction coefficient is written back. The method can reduce overload and underload, stabilize zero visible leakage, reduce energy consumption and prolong the service life of the soft seat, improve the predictability of operation and maintenance and the consistency of parameters, and support online diagnosis and maintenance decision.

The invention discloses a rail transit concrete compression fatigue coefficient detection device. A corresponding rail transit concrete test block is fixed by a four-jaw chuck base and a four-jaw chuck device; a simulation solution is added into a water tank until the simulation solution submerges a copper block, current is applied below a pressure transmission device through a first wire and a second wire to simulate the environment, and after the pressure transmission device is supported by a hydraulic device and adjusted to a proper height, the pressure transmission device is compressed at a fixed frequency through the hydraulic device to simulate a real compression load; by monitoring the deformation, crack propagation, compression fatigue life and electrochemical response of the rail transit concrete test block, the compression fatigue coefficient of the rail transit concrete compression fatigue under the composite working condition is evaluated. By adopting the technical scheme of the invention, the stress state of the rail transit concrete compression fatigue in actual operation can be truly reflected, and the rail transit concrete compression fatigue coefficient can be accurately evaluated.

The application belongs to the technical field of computer-aided design and structure design, and discloses a multi-scale lattice structure and a design method thereof. The design method comprises the following steps: S1, a cubic unit cell with 8 symmetrically distributed corner nodes is designed according to a cubic lattice structure; S2, all lattice unit cells are scaled respectively, a part of the lattice unit cells are scaled into small lattice unit cells with a size being half of the original size, and the other part of the lattice unit cells are large lattice unit cells with the original size; S3, the positional relationship of the small lattice unit cells and the large lattice unit cells is arranged in a macroscopic lattice structure; and S4, the macroscopic lattice structure is adjusted by using a connection mode of the small and large lattice unit cells based on rod diameter transition through a computer-aided design method. The multi-scale small and large lattice unit cell arrangement mode is introduced into the lattice structure, so that the lattice structure has better mechanical properties under the same compression load.

A sealing machine and method for controlling a sealing machine Includes the following steps: placing capped containers provided with a seal on plates, rotating the plates, pressing the seal against the cap of the container and fastening said seal using a sealing head. The step of rotating the plates is performed by rotating each plate independently of the other plates. The method further includes: detecting at least one parameter associated with the rotation of a plate and / or with a compression load between each sealing head and the seal, and comparing the value of the detected parameter with a reference range.

The utility model relates to the field of aircraft body structures, and provides a truss type aircraft cargo hold floor structure and an aircraft, the cargo hold floor structure comprises a fuselage frame, a truss, a floor cross beam, fuselage frame connecting nodes, floor cross beam connecting nodes and a floor; the floor beams are arranged on the upper portion of the machine body frame, and the two ends of each floor beam are fixedly connected with the machine body frame. The truss comprises a plurality of stand columns, one ends of the stand columns are connected with the fuselage frame through fuselage frame connecting nodes, and the other ends of the stand columns are connected with the floor cross beams through floor cross beam connecting nodes. The stand columns can rotate around the fuselage frame connecting joints or the floor beam connecting joints. A triangular structure is formed between every two adjacent stand columns and the machine body frame or the floor beam. According to the utility model, the assembly process is simplified, and the production efficiency is improved. And the connecting rotating shafts are adopted at the connecting positions of the truss, the fuselage frame and the floor cross beam, so that the connecting positions only transmit tension and compression loads, and the situation that the positions are insufficient in connection due to large bending moment of the bottom frame is avoided.

The invention discloses a multi-axis synchronous fatigue and limit mechanical property testing device. The device comprises a supporting frame, a vertical force application device, a circumferential force application device, a transverse force application device and a test piece clamping device. The vertical force application device is arranged along the vertical direction and is used for applying a vertical compression load; the circumferential force application device is horizontally arranged and comprises a circumferential actuator, two sets of rolling combination devices and a circumferential limiting device, and the two sets of rolling combination devices are clamped on the two opposite sides of the test piece respectively to apply circumferential compression loads; the transverse force application device is perpendicular to the circumferential force application device and is used for applying a transverse bending load; and the test piece clamping device is fixed on the ground. Synchronous triaxial loading can be carried out on the structural test piece, the stress characteristics of the ultra-deep diving structure under the extreme load condition are truly simulated, the structure is compact, loading of all axes does not interfere with one another, and structural nodes manufactured through a real welding process can be examined.

The invention relates to the technical field of metamaterials, and discloses a unit structure with positive and negative Poisson ratios and a metamaterial. Each unit structure comprises a main body frame and a connecting rod, the main body frame comprises a first frame body and a second frame body which are arranged at intervals in the first direction and connected, and the first frame body and the second frame body are in mirror symmetry and each comprise a first bent part and a second bent part which are connected end to end and bent towards each other. The connecting rods extend in the first direction, the first frame body and the second frame body are each provided with one connecting rod, one end of each connecting rod is detachably and movably connected with the first bent part, and the other end of each connecting rod is detachably and movably connected with the second bent part. When the two connecting rods bear a tensile load and a compressive load, the connecting rods are selected to be in contact with the first bending part or the second bending part for force transmission. No matter the main body frame bears a tensile load or a compression load, the main body frame generates expansion deformation or contraction deformation in the second direction, so that the unit structure and the metamaterial have the positive Poisson's ratio characteristic and the negative Poisson's ratio characteristic, and the application range of the metamaterial is widened.

The present invention provides a wall panel compression stability testing device, which comprises: an upper pressure plate assembly, a side support plate assembly, a lower pressure plate assembly, a corner box assembly, an adjusting rod assembly and a rib clamping assembly, wherein the upper pressure plate assembly is arranged above a test piece, the side support plates are arranged on both sides of the test piece, the lower pressure plate is arranged below the test piece, the corner box assembly is arranged between the long girders at both ends of the test piece, the corner box assembly is connected to the test piece skin by bolts, the adjusting rod assembly is arranged between the side support plate assemblies, and the rib clamping assembly is matched with the adjusting rod assembly, and an assembly relationship is formed between the components through mechanical connection. The present invention is used for testing the bearing capacity of wall panel compression stability and verifying the stability analysis method, and can ensure the uniform transmission of the compression load of the test piece and prevent additional bending moment caused by eccentric loading.

The present invention relates to a conductive particle having a conductive layer on the surface of a core particle, the conductive particle having a compression ratio of 90-98% when a compressive load is 10 mN. The conductive particles have a compression rate of 50% or less when a compression load is less than 9 mN, and a rebound rate of 1-10% when the compression rate is 90% or more. The conductive particles can be produced by a production method having a step for forming a conductive layer after cooling the core material particles under specific conditions.

The invention relates to the technical field of collaborative design, in particular to an intelligent data processing method for public facility design, and the method comprises the steps: determining to carry out hierarchical loading based on a comprehensive evaluation value or carry out trigger loading based on a data abundance value and behavior feedback abnormality according to the category of a design end; determining whether a loading strategy of the target design end at each loading moment of the current loading design period is adjusted from synchronous loading to asynchronous loading or not according to the increment reference value and the spatial loading difference degree; in the asynchronous loading, determining a loading priority coefficient corresponding to each reference design end according to the abnormal evaluation value, and determining whether to perform in-end loading optimization for the reference design end according to the iteration fluctuation degree and the abnormal sub-region proportion; and in the in-end loading optimization, executing an optimization strategy of sub-region grouping loading, and determining whether to adjust the optimization strategy into hierarchical compression loading or not according to a space time sequence coupling abnormal coefficient. According to the invention, the design data loading stability can be improved.

The invention relates to a crack arrest design method and a crack arrest structure for a bonding area of a pressure-bearing wall plate structure, and the crack arrest design method comprises the following steps: S1, determining a buckling deformation profile of the pressure-bearing wall plate structure when bearing a compression load, determining the position of the minimum deformation in the length direction of a stringer, and determining a crack arrest area according to the position; s2, a crack arrest notch is formed in the edge of the outer side of the cap bottom plate in the crack arrest area, the crack arrest notch gradually becomes smaller from the outer side to the inner side, and the edge is in smooth transition; s3, a gasket is made of the same material as the cap bottom plate, the gasket is matched with the crack-arrest notch in shape and consistent with the crack-arrest notch in thickness, the gasket is arranged in the crack-arrest notch and fixedly bonded with the wall plate, and the edge of the gasket is not fixedly connected with the edge of the crack-arrest notch; and S4, a laying layer is arranged on the cap bottom plate in the crack arrest area to serve as a transition belt plate, and the transition belt plate completely covers the crack arrest notch and is bonded and fixed to the cap bottom plate. The crack arrest structure is obtained through a crack arrest design method.

An in situ monitoring system of compression load on a stack includes a stack assembly, a tie rod assembly, and a compression load measurement device. The stack assembly includes the stack, a first endplate, and a second endplate that cooperate to apply a compression load to the stack. The tie rod assembly includes a tie rod that extends between the first endplate and the second endplate. The compression load measurement device is coupled to the tie rod or the first and second endplates and configured to determine the compression load applied to the stack during operation of the stack.