24 results about "Stress working" patented technology

The invention relates to the technical field of tunnel engineering design, and discloses a comprehensive evaluation method and system for longitudinal deformation of a shield tunnel, and the method comprises the steps: obtaining a target shield tunnel analysis calculation parameter; based on the target shield tunnel analytical calculation parameters and the target shield soil analytical calculation parameters, constructing a first shield tunnel stress calculation model to calculate additional stress at the axis of the target shield tunnel; constructing an additional stress work equation at the axis of the target shield tunnel to obtain the total work of the target shield tunnel under stress; constructing a second shield tunnel longitudinal deformation calculation model based on an energy method to obtain a longitudinal displacement field at the axis of the target shield tunnel; constructing a third shield lining performance nonlinear degradation model to obtain an evaluation index of the longitudinal deformation of the target shield tunnel; evaluating the longitudinal deformation of the target shield tunnel based on the evaluation index; the tunnel longitudinal deformation evaluation method solves the problems that an existing tunnel longitudinal deformation evaluation method is single in consideration of influence factors and poor in evaluation accuracy.

The invention discloses a torsional shear mechanical property testing device and method for a hollow cylinder structure, and belongs to the technical field of mechanical structure testing. The device comprises an axial driving mechanism, a radial driving mechanism and a fixed supporting mechanism. The axial driving mechanism is connected with the axial actuating pressure plate through an actuating main shaft; the radial driving mechanism comprises a radial driving mandrel of an inverted conical structure and a driving sliding plate matched with the radial driving mandrel, and axial movement of the main shaft is converted into radial expansion movement through conical face fit. The fixed supporting mechanism is a closed supporting system composed of an outer sleeve, an upper cover plate and a base. Through the unique inverted conical structure design, independent or synchronous application of axial compression, radial expansion and torsional shear loads can be achieved, and the complex stress working condition is effectively simulated. The device has the advantages of being stable in structure, high in testing precision, easy and convenient to operate and the like, meanwhile, equipment universality and maintenance convenience are remarkably improved through the replaceable design of the driving sliding plate, and the device is suitable for mechanical property testing of various hollow cylindrical structural parts.

The invention belongs to the technical field of deep rock mass engineering anchoring support system tests, and particularly discloses a deep rock mass engineering anchoring support system test platform and method. The deep rock mass engineering anchoring support system test platform comprises a loading host, a guide rail, an anchoring body confining pressure drawing unit, an anchoring body double-shear unit, a surface protection structure performance test unit, a moving unit, a hydraulic servo system, a control system and a control system. According to the deep rock mass engineering anchoring support system test platform and method, confining pressure pull-out test, double shear test and surface protection structure performance test can be conveniently carried out through one set of test platform, the stress working condition of the anchoring support system can be truly simulated, accurate mechanical test can be carried out on the anchoring support system, and the test efficiency is improved. And the bearing capacity of the anchoring support system is tested, and the corresponding action mechanism of the anchoring support system is disclosed, so that related test results provide key theoretical and technical support for safe construction of deep rock mass engineering and efficient and safe mining of deep land resources.

The invention provides a floating dock lightering analysis method which comprises the steps that finite element models of a ship to be lighted and a bearing beam are established in finite element analysis software, the bearing beam is arranged on a bearing trolley and can move along with the bearing trolley, and a plurality of cushion blocks used for supporting the ship are arranged on the bearing beam; calculating the reaction force of each cushion block, and arranging the reaction force to form a reaction force distribution diagram; judging whether the bearing beam with the deformation degree exceeding the allowable standard exists or not; in the lightering process, a plurality of typical stowage working conditions are selected, overall stress analysis is conducted on the floating dock under the typical stowage working conditions, and a floating dock stowage scheme is determined; a finite element model of the floating dock is established, a plurality of typical stress working conditions are selected in the lightering process, and finite element analysis is conducted on stress distribution and deformation of the floating dock structure under the typical stress working conditions. According to the technical scheme, the calculation efficiency and simulation precision of the floating dock lightering process can be effectively improved, and the safety of the ship during floating dock lightering is better ensured.

The embodiment of the invention provides a preparation method of a stabilizer bar, the stabilizer bar and a vehicle. The preparation method of the stabilizer bar comprises the steps that parameters of the stabilizer bar are calculated; selecting a corresponding steel plate according to the parameters of the stabilizer bar; variable-thickness rolling is conducted on the steel plate, and a variable-thickness plate with a plurality of thickness areas arranged in the rolling direction is formed; the variable-thickness plate is curled and welded to form a pipe; and manufacturing the pipe into the stabilizer bar. According to the preparation method of the stabilizer bar, reasonable thickness distribution is formed in the length direction of the stabilizer bar according to the stress working condition of the stabilizer bar, on one hand, the stabilizer bar can adapt to bending and torsion loads of different areas, the rigidity and fatigue resistance of the stabilizer bar are met, on the other hand, the stabilizer bar can be lightened, and the cost and the weight are reduced.

The invention belongs to the technical field of structure optimization design, and particularly relates to a fiber composite failure safety topological optimization design method and system under a dynamic load, and the method comprises the steps: defining a design domain and related design parameters based on the stress working condition and geometric characteristics of a to-be-optimized structure; carrying out transient dynamic analysis and constructing an equivalent static load for topological optimization, constructing a multi-local failure working condition by taking material density, angle subinterval selection and a fiber angle as design variables, introducing an equivalent directional stiffness matrix continuously related to the fiber angle, and aggregating a multi-working-condition flexibility target by adopting a normalized KS function; failure safety topological optimization iteration and internal and external circulation convergence judgment are carried out in combination with a moving asymptote method, and collaborative optimization of structural topology and fiber orientation is achieved under the dynamic load condition. The problem that it is difficult to consider structural redundancy, failure safety and fiber orientation collaborative design in fiber reinforced composite topological optimization under the dynamic load is solved, and structural safety redundancy and local damage resistance are improved.

The invention discloses a working condition self-adaption-based guide vane connecting rod stress trend diagnosis method, and relates to the technical field of intelligent diagnosis of hydroelectric generating sets, and the method comprises the steps: constructing an optical fiber stress monitoring system, setting an optical fiber grating sensor for a guide vane connecting rod, collecting a stress signal in real time, and collecting operation parameters; the method comprises the following steps: collecting multi-working-condition data within one month of normal operation after overhaul of a unit, calculating a correlation matrix between guide vane connecting rod stress and operation parameters, and establishing a stress working condition self-adaptive analysis model; and calculating a maximum value, a minimum value, an average value and a standard deviation of stress based on rolling statistics, determining a normal range of stress fluctuation, inputting real-time acquired data into a diagnosis algorithm, judging a stress deviation trend according to the reference model, outputting an alarm level, and updating the reference model. According to the method, the accuracy and timeliness of anomaly recognition are improved, the pertinence and the performability of maintenance decision making are enhanced, and the operation safety and the service life management effect of the guide vane connecting rod of the hydraulic unit are improved.

The invention relates to the field of euphausia superba fishing processing boats, in particular to a stress testing method for an euphausia superba boat trawl truss. Through theoretical calculation and finite element analysis, weak stress points and large strain points of a truss structure are found, a load test method and a stress monitoring method are reasonably planned according to the structural characteristics and stress working conditions of the truss, and after stress and strain data information is obtained through tests, the stress and strain data information is obtained. And comparing the test result with theoretical calculation and finite element analysis, and finally verifying whether the result is consistent or not. Compared with a traditional method, the method has the advantages that the test period is remarkably shortened, and the test cost is reduced; through an accurate strain measurement system and an advanced data analysis means, the authenticity and reliability of a test result are ensured; potential problems of the truss are found in time, prevention and improvement measures are taken in advance, the safety of the truss is improved, and the service life of the truss is prolonged.

The utility model belongs to bridge construction technical field, concretely relates to a bridge expansion joint auxiliary installation device, including stress working beam, adjusting screw subassembly, support plate subassembly and level gauge, stress working beam is set in the above of bridge expansion joint reserved slot transversely, stress working beam both ends are set on the bridge surface pavement layer of bridge reserved slot both sides, adjusting screw subassembly is connected with stress working beam, support plate subassembly is connected with adjusting screw subassembly, and level gauge is set on the surface of stress working beam, the auxiliary installation device passes through the synergies of stress working beam, adjusting screw subassembly, support plate subassembly and level gauge, has improved installation quality and efficiency significantly, has reduced labour intensity and safety risk, has brought the reduction of comprehensive cost and the promotion of bridge pavement long -term service performance more, has better economic benefit and practicality.

The application relates to a longitudinal elastic cable constraint system design method and a cable-stayed bridge design method, which comprises the following steps: fixing the longitudinal constraint of a middle tower, calculating a plurality of elastic cable cross-sectional areas according to the longitudinal constraint force under a plurality of stress working conditions and an elastic cable structure safety coefficient, and taking the maximum value of the plurality of elastic cable cross-sectional areas as an elastic cable cross-sectional area design value; and determining the cable length according to the elastic cable cross-sectional area design value and the maximum longitudinal displacement amount of a main beam. According to the application, the elastic cable cross-sectional area is determined first, and then the cable length is determined according to the elastic cable cross-sectional area design value and the maximum longitudinal displacement amount of the main beam. Since the elastic cable cross-sectional area has been determined, only the elastic cable length needs to be tried, and compared with the case that the elastic cable cross-sectional area and the elastic cable length are both uncertain, the trial workload can be greatly reduced, so that the longitudinal elastic cable key parameters can be quickly and effectively determined, and favorable conditions are created for subsequent deepening design of the bridge scheme.

The invention belongs to the field of aerospace equipment, and particularly relates to an actuator cylinder. Comprising a shell, a joint bearing is arranged in the middle of the shell, a roller lead screw is installed in an angular contact bearing, one end of the roller lead screw is connected with a motor through a coupler, the other end of the roller lead screw is connected with a push rod, and a linear position sensor used for detecting the stroke position of the push rod is installed at the upper end of the angular contact bearing. The front end of the push rod is connected into the shell through a bearing, and the shell is in threaded connection with a shell end cover. According to the structural design, various stress working conditions are comprehensively considered, calculation is carried out, it is guaranteed that all part structures have enough rigidity and strength, and a certain safety coefficient and structural reliability are guaranteed; and natural and mechanical environment requirements under normal working conditions can be met, and certain economic benefits can be brought to enterprises.

The invention discloses a blade mechanical test fixture, a mechanical test system and a mechanical test method, and relates to the technical field of material performance testing, the blade mechanical test fixture comprises a fixing assembly and a force application assembly; the fixing assembly comprises a base, a supporting assembly and a clamping assembly, the base is installed on a base of the testing machine, the supporting assembly is arranged on the base and used for supporting the clamping assembly, the clamping assembly is used for fixing one end of the blade sample, and the clamping assembly is provided with an arc-shaped clamping face attached to the surface of the end of the blade sample; the force application assembly is connected to an actuator of the testing machine, so that the force application assembly can apply a cyclic load to the other end of the blade sample. The blade mechanical test fixture provided by the invention can accurately simulate the real stress working condition of a blade component while realizing reliable clamping of the blade component, and obtains reliable bending fatigue performance data.

The invention discloses a wind power blade buckling test vector bending moment calculation method and device based on a neutral axis, and relates to the field of wind power blade component testing. The method comprises the following steps: completing coordinate conversion from a full-size blade to a blade section according to a neutral axis, an elastic axis and an elastic axis coordinate system of the full-size blade; calculating the strain value of the blade section through the structural characteristics of the blade section and the coordinate conversion bending moment variable; calculating to obtain a neutral axis and an inclination angle according to the strain value of the blade section, and generating a trailing edge section section; calculating the position of a load shaft of the trailing edge section, further calculating the strain and vector force of a specific position, and finally obtaining the vector bending moment of the trailing edge section. The device comprises a steel structure tool, a vector bending moment loading device and an electrical control system. The loading device controls the loading direction of a loading oil cylinder through four small electric cylinders, and application of the vector bending moment is achieved. According to the method, the full-size test is mapped through the part-level test of the trailing edge section, and the vector bending moment borne by the trailing edge section is analyzed, so that the load matching degree of the blade test and the real stress working condition is improved.

The invention belongs to the technical field of bridge structure test loading devices, and discloses a composite loading device capable of rectifying the posture of an I-beam and a loading method.The composite loading device comprises a plurality of surface external loading devices evenly arranged in the axial direction of an I-beam test piece and a longitudinal loading device arranged in the center of the top surface of the I-beam test piece; the surface external loading device comprises two-way jacks on two sides of a web of the I-beam test piece, the two-way jacks are respectively an inward pulling jack and an outward pushing jack, and the end parts of the jacks are connected with an upper flange plate or a lower flange plate of the I-beam test piece; forces applied by the inward pulling jack and the outward pushing jack are equal in magnitude but opposite in direction; the axial spacing L of the jacks is consistent with the transverse spacing T; one end of the I-beam test piece is erected on the fixed hinged support, and the other end of the I-beam test piece is erected on the sliding hinged support; leveling platforms are arranged between the hinged supports and the I-shaped beam test pieces; and the axis of the leveling platform is parallel to the axis of the I-beam test piece. According to the invention, transverse and longitudinal composite loading can be realized, the transverse posture of the beam body can be corrected, and the stress working condition of the beam body can be truly simulated.

The invention discloses a magnetic suspension high-speed internal lift pump for deep well mining, and relates to the technical field of fluid machinery, the magnetic suspension high-speed internal lift pump comprises a pump body, the pump body is composed of an upper end cover, a middle shell and a lower end cover which are detachably connected from top to bottom in the axial direction, and a through fluid channel is arranged in the pump body; the integrated overflowing structure is arranged in the fluid channel and comprises a vertical center shaft, spiral blades spirally distributed on the center shaft and an annular shell arranged outside the spiral blades; the motor assembly is contained in the middle section shell and used for driving the integrated overflowing structure to rotate so as to increase the fluid pressure. The main axial load borne by the center bearing is actively shared through the magnetic suspension assembly, the stress working condition of the bottom auxiliary mechanical bearing is effectively improved, and therefore the service life of the bearing and the whole pump body in the deep well high-pressure and high-impurity environment can be prolonged, and the operation reliability is improved.

The invention discloses a method and a system for calculating the fatigue life of a translational driving hammer of an automatic firearm in consideration of multi-working-condition coupling, and belongs to the technical field of computer numerical simulation. The method comprises the following steps: carrying out strength simulation on a driving hammer under different stress working conditions to determine a breakage dangerous position of the driving hammer; analyzing the load of the driving hammer under different stress conditions to determine the relationship between the maximum speed and the projectile amount of a collision object colliding with the driving hammer under each stress condition; determining damage values of the driving hammer at the breakage dangerous position under different stress working conditions by utilizing the relationship between the maximum speed and the projectile amount of a collision object colliding with the driving hammer under different stress working conditions; and calculating the sum value of the damage values of the driving hammer at the fracture dangerous position under each stress working condition, calculating the reciprocal, and taking the reciprocal as the fatigue life of the automatic gun translation driving hammer. The fatigue life of the automatic firearm hammer can be accurately calculated, and the design of long life of key parts of firearms is ensured.

The invention discloses a tire cord stress analysis result processing method and device and electronic equipment. The method comprises the steps that an inflation simulation result of a target tire is obtained, the inflation simulation result is used for reflecting stress information of each cord thread node of a cord thread of the target tire, and the cord thread nodes are minimum calculation units forming the geometrical shape of the cord thread; a stress curve corresponding to the stress information is determined, the stress curve extends in the direction of a cord thread curve, and the cord thread curve is a continuous geometric curve presented on the cross section of the target tire; and combining the cord curve and the stress curve to obtain a target image. According to the tire cord thread stress analysis method and device, the technical problem that the stress distribution and the change trend of each cord thread under the actual stress working condition are difficult to intuitively reflect by the stress analysis result of the tire cord thread in the related technology is solved.

The utility model relates to the field of bridge supports, and discloses a novel bridge rubber support. An upper supporting transverse plate is fixedly installed between first side connecting plates, a lower supporting transverse plate is fixedly installed on the lower surface of the upper supporting transverse plate, a plurality of middle steel plates are fixedly installed below an upper sealing plate, a lower sealing plate is fixedly installed below the middle steel plates, and a rubber plate is arranged outside the upper sealing plate. The upper sealing plate is arranged above the rubber support body, the contact rigidity of the upper portion of the rubber support and the good flatness of the sealing plate are improved, and it is guaranteed that the upper portion of the rubber support does not deform and contact stress is uniform; the lower sealing plate is arranged below the rubber support body, so that the contact rigidity of the lower portion of the rubber support and the good flatness of the sealing plate are improved, and it is guaranteed that the lower portion of the rubber support does not deform and contact stress is uniform; the structure facilitates cost control and rapid popularization, meanwhile, the device is novel in structure and reasonable in design, the stress working condition of the rubber support is effectively improved, the horizontal anti-sliding performance of the rubber support is improved, and the service life of the rubber support is prolonged.

The application discloses a bidirectional vibration triaxial apparatus capable of keeping absolute phase difference of load and a use method thereof, and belongs to the technical field of geotechnical engineering test. The application can control and keep the absolute phase difference of the axial and radial dynamic load amplitude, and can simulate various stress working conditions including the action of the seismic load. The apparatus has simple structure and simple control system, and can realize stress type control of the axial stress and the radial stress. Under the condition that the sectional area of the loading rod is same as that of the sample, triaxial test of the bidirectional cyclic load of the principal stress rotation and triaxial elongation can be carried out, and the triaxial test has significance for studying the deformation characteristics of the loose granular body (soil body) material under the complex stress working conditions.

The present application belongs to the technical field of bridge structure test loading device, and discloses a composite loading device and loading method capable of correcting the attitude of I-beam, which comprises a plurality of out-of-plane loading devices arranged uniformly along the axial direction of the I-beam test piece and a longitudinal loading device at the center of the top surface of the I-beam test piece; the out-of-plane loading device comprises bidirectional jacks on both sides of the web of the I-beam test piece, which are respectively inner pulling jacks and outer pushing jacks, and the end of the jack is connected with the upper flange plate or the lower flange plate of the I-beam test piece; the force applied by the inner pulling jacks and the outer pushing jacks is equal in size but opposite in direction; the axial spacing L of the jack is consistent with the transverse spacing T; one end of the I-beam test piece is erected on a fixed hinge support, and the other end is erected on a sliding hinge support; a regulating platform is arranged between the hinge support and the I-beam test piece; and the axis of the regulating platform is parallel to the axis of the I-beam test piece. The present application can realize composite loading in the transverse and longitudinal directions, correct the transverse attitude of the beam body, and truly simulate the stress working condition of the beam body.

The application discloses a kind of laser measuring equipment and detection method based on processing of flame-retardant plate, it is related to laser measuring technical field, including support frame, acoustic detection device, flame-retardant plate lifting mechanism, laser detection mechanism.The application realizes the initiative stress excitation detection of the structural strength of flame-retardant plate by the two different working modes of flame-retardant plate lifting mechanism, mode one makes flame-retardant plate present the form of " two ends are raised, middle part is depressed " by double-side synchronous lifting, simulates the stress working condition when plate is subjected to uniform load or large-span support in actual application, to accurately evaluate its overall bending stiffness and elastic modulus;Mode two makes plate produce asymmetric distortion by the way of one-side lifting, the other side static resistance, two modes amplify hidden internal structure hidden danger through macroscopic physical deformation, so that strength detection is more comprehensive and has pertinence.

The invention discloses a conical concrete pole with a prestressed steel bar anchoring head, and belongs to the technical field of concrete poles. Comprising a rod body, a prestressed steel bar is arranged in the rod body, the top end of the prestressed steel bar extends to the position above the rod body, an anchoring head body is integrally formed, a cover plate is arranged on the portion, located on the outer side of the anchoring head body, of the upper surface of the rod body, and a protection mechanism is arranged on the upper surface of the cover plate; the prestressed steel bar and the anchoring head body are integrally formed, so that the connection strength of the prestressed steel bar and the anchoring head is effectively enhanced, the problem of slippage easily occurring in traditional split connection is solved, stable transmission of prestress in a rod body is guaranteed, prestress loss is reduced fundamentally, and the service life of the rod body is prolonged. The pre-pressing effect of the prestressed steel bars on the pole body is fully exerted, the crack resistance and bending resistance of the conical cement pole are remarkably improved, and the pole body is made to adapt to the complex stress working condition of an outdoor overhead line.

The invention relates to a pre-twisted backup drainage wire clamp armor rod along-line fatigue testing machine. The problems that in the prior art, the state detection of the preformed armor rod cannot effectively simulate the complex real stress working condition, and the durability and reliability of the preformed armor rod cannot be accurately evaluated are solved. The device comprises an assembling rack, one end of the assembling rack is connected with a crank distance adjusting mechanism through a driving mechanism, the crank distance adjusting mechanism is connected with sliding assemblies arranged at the other end of the assembling rack in a sliding mode through linkage connecting rods, and a clamping mechanism used for clamping the preformed armor rod is arranged between the sliding assemblies. The crank adjusting mechanism is provided with an elastic supporting structure used for supporting one end of the linkage connecting rod. The device has the advantages that various real working conditions can be accurately simulated, and efficient detection is achieved; and the structure is simple, the operation is convenient, a scientific basis can be provided for design optimization and service life prediction of the preformed armor rod, and the method has important engineering application value.

The invention relates to the technical field of bearing modification, in particular to a tapered roller bearing modification method, which comprises the following steps of: establishing a tapered roller bearing model, and loading an actual stress working condition of a bearing; convexity values are selected at equal intervals, and comprehensive stress concentration coefficients Kt matched with different convexity values of the bearing outer ring, the bearing inner ring and the rolling body are calculated; respectively drawing relation curves of convexity values of the inner ring, the outer ring and the rolling body and Kt; selecting the convexity value optimization range of the outer ring, the inner ring and the rolling body corresponding to the minimum value of the Kt, and calculating the optimal convexity modification parameters of the outer ring, the inner ring and the rolling body by taking the minimum value of the Kt as an optimization target and adopting a curved surface response method; and modifying the tapered roller bearing by using the convexity modification parameters. According to the method, the possibility that stress concentration occurs between two parts of a bearing inner ring and an outer ring and a rolling body is considered at the same time, weights are given for calculation, a bearing mechanical analysis model is established, and a better convexity modification value range of the outer ring, the inner ring and the rolling body is obtained, so that the final modification effect of the bearing is optimized.