482 results about "Torsional deformation" patented technology

The invention relates to the technical field of data processing, and discloses a large steel structure hoisting precision real-time monitoring method and system. The method comprises the following steps: scanning and collecting the edge of a steel structure through a distributed sensor network, and obtaining structure data to obtain an original monitoring data set; extracting and analyzing structure transient response features based on the original monitoring data set, and generating a state feature matrix; analyzing a coupling relationship between local deformation and overall torsion to obtain a dynamic response prediction matrix; performing space-time registration and data fusion on the monitoring data, and constructing a state evaluation data set; carrying out optimization calculation on the hoisting parameters to generate a hoisting control data packet; and performing intelligent reasoning analysis in combination with historical case data, and outputting a control instruction sequence. Real-time monitoring of the coupling relation between local deformation and overall torsional deformation in the hoisting process of the large steel structure is achieved, and the technical defect that in the prior art, the structural deformation development trend cannot be accurately recognized and predicted is overcome.

The invention discloses a cultural relic preventive protection method based on big data analysis, belongs to the technical field of cultural relic protection, and mainly aims to solve the technical problem that a complex damage mechanism caused by mutual coupling of torsional deformation and inclined deformation in cultural relic protection is difficult to accurately predict. A dual-mode deformation data stream is obtained through a multi-point sensor, accurate data alignment is achieved through millisecond-level time synchronization processing, and correlation characteristics between deformation modes are recognized by calculating a coupling strength coefficient through correlation analysis. And when the coupling strength exceeds a threshold value, determining a deformation propagation direction vector by combining a spatial interpolation method, and calculating an internal stress distribution field and positioning a stress concentration area by utilizing a finite difference method. High-frequency sampling tracking is carried out on the high-risk area, and a stress relaxation time constant and a creep coefficient are obtained. Accurate prediction and active protection of cultural relic deformation damage are realized.

A device for adjusting a position of a vehicle seat has a structure in which two or more adjustment devices, such as lead screws for adjusting tilting, are connected to the opposite side portions of a seat cushion frame to allow the lead screws to rotate by two gearboxes connected to one motor, so that a seat cushion is stably tilted by the two or more lead screws and the opposite side portions of the seat cushion frame is stably supported by the two or more lead screws, in order to prevent shaking, vibration, and torsional deformation caused by a gap generated when tilting the seat cushion frame.

The invention discloses a multifunctional reliable double-station three-dimensional laser cutting system which comprises a lathe bed, a rail sliding table conveying mechanism and two sets of cross beam modules. By the adoption of the structure, the cross beams of the two cross beam modules are each of a hollow structure, frequent deviation rectification and debugging are not needed, torsional deformation of the cross beams is not prone to being caused, and the static and dynamic characteristics of the three-dimensional laser cutting machine are excellent; the two sliding tables not only can independently carry out feeding and discharging procedures on two sets of small workpieces, but also can cooperatively carry out feeding and discharging on large workpieces together. Moreover, when the visual detection assembly can carry out online visual detection on the workpieces on the positioning tool, the positioning tool can synchronously drive the waste removing mechanism to remove waste on the tool base into the waste collecting box, and two procedures are completed in one step. And moreover, the sliding table module can provide two degrees of freedom capable of being adjusted on line in the horizontal direction, and a plurality of degrees of freedom are realized on the cross beam module, so that a redundant machining mode with super multiple degrees of freedom can be realized.

The invention provides a continuous production method of a high-strength and high-toughness austenitic stainless steel plate with a 3D full-gradient structure, and belongs to the technical field of stainless steel plate production. According to the method, an austenitic stainless steel plate is subjected to cold rolling and cutting, the size specification and the surface quality of the austenitic stainless steel plate are controlled, and then the rolled austenitic stainless steel plate is subjected to austenitizing treatment; or the austenitic stainless steel plate is firstly subjected to hot rolling to control the size specification, then rapid cooling is conducted, and the coarse-grain single-phase austenite structure is obtained. And then, reciprocating torsional deformation is conducted on the coarse-grain single-phase austenitic stainless steel plate, on the basis that the macroscopic size specification of the coarse-grain single-phase austenitic stainless steel plate is not changed, combination of the strength and the toughness of the coarse-grain single-phase austenitic stainless steel plate is greatly improved, and finally the plate is rolled into a The size specification and the surface quality of the plate are accurately controlled by adjusting a rolling process; and meanwhile, controllable construction of a 3D full-gradient structure is achieved by regulating and controlling reciprocating torsion technological parameters, and therefore cooperation of high strength and high toughness is achieved.

An intelligent steel structure corridor deformation monitoring and deviation rectifying method comprises the following steps that deformation measuring points are arranged on the bearing faces of corridor supporting columns, displacement data of the deformation measuring points are collected, and the deflection of a midspan main beam is obtained; when the deflection gamma of the midspan girder is equal to 0, the corridor does not deform, and the monitoring is finished; when the deflection gamma of the midspan girder is not equal to zero, it is judged that the corridor has flexural deformation, and the following steps are continued; and on the basis of displacement data between the deformation measuring points, a lifting displacement difference and a torsional deformation value are obtained, parameters of a deviation rectifying device are set, and the corridor is rectified through the deviation rectifying device. The invention further discloses an intelligent steel structure corridor deformation monitoring and deviation rectifying system, according to the intelligent steel structure corridor deformation monitoring and deviation rectifying system disclosed by the invention, the deformation and posture conditions of the corridor are monitored in time, the manufacturing and lifting efficiency of the steel structure corridor is improved, and the product quality and the structural stability are ensured.

The invention discloses an aluminum profile double-traction device, and relates to aluminum profile production and processing equipment. The first tractor and the second tractor are arranged on the same guide rail assembly in parallel; the guide roller assembly comprises a guide roller for bearing and conveying the aluminum profile; when the first tractor or the second tractor passes, the guide roller assembly swings downwards to prevent the guide roller from interfering with a clamp. Floating clamps are arranged on the first tractor and the second tractor, torque caused by guide roller retardation or initial stress of the aluminum profile is effectively absorbed and released through the floating clamps, torsional deformation in the horizontal plane is prevented, and the shape quality of the profile is ensured.

A new and old bridge widening structure adapting to multi-directional displacement belongs to bridge construction technology; it includes an anchoring structure and a block simply supported steel plate beam spanning structure arranged on the new and old bridges; expansion joints are arranged between the block simply supported steel plate beam spanning structures; the anchoring structure is an inverted L-shaped steel or welded steel plate with a comb-shaped tooth plate; a supporting bracket device is arranged at the lower part of the anchoring structure; the simply supported steel plate beam spanning structure includes a comb-shaped tooth plate steel plate with comb-shaped tooth plates matching the anchoring structure at both ends, the comb-shaped tooth plate steel plate is provided with two transverse steel ribs and a stiffening steel plate along the bridge direction, and a movable support mechanism is arranged under the two transverse steel ribs. The present invention adopts a longitudinal modular block simply supported steel plate beam spanning structure and a support system suitable for multi-directional displacement, which can adapt to the vertical flexural deformation difference and longitudinal deformation, transverse deformation, torsional deformation of curved beams and single-support beams caused by the different stiffness of the new and old bridges, and can be quickly constructed and replaced.

A device and a method for actuating a joint of a human, an animal or a robot are disclosed. An elongated, lengthwise flexible and torsionally elastic body is provided for transmitting torque. Based at least in part on torsional deformation information of the body, torque is transmitted via the body. In an embodiment, a flexible drive shaft is provided, whereby the flexible drive shaft comprises said body. Furthermore, use of a flexible drive shaft as compliant element and as torque transmission element in a rotary actuator for actuating a mechanical joint is disclosed. In addition, use of a flexible drive shaft for determining an impedance of a joint of a human or an animal is also disclosed.

The utility model relates to a tensioning device for a building block type screw. The tensioning device comprises a stretching piece, a pressing piece, a telescopic piece and a driving piece. The stretching piece is used for being connected with a locking piece of the building block type screw. The pressing piece is used for being connected with a thread element of the building block type screw. One end of the telescopic piece is connected with the stretching piece, and the other end of the telescopic piece is connected with the pressing piece; the driving part is connected with the telescopic part and used for driving the telescopic part to do telescopic motion. Compared with the prior art, the tensioning piece and the pressing piece only transmit axial force to the shaft core and the thread element, so that the transmission efficiency of the tensioning force is high, and compared with a radial screwing mode of a traditional torque wrench, radial load is not borne between the shaft core and the thread element, and the torque wrench is simple in structure and convenient to use. The problem that the friction coefficient is increased due to torsional deformation of the thread element and the shaft core spline is solved.

The invention discloses an integrated gear clamp and a correction and calibration device, a torque transmission structure is integrally cylindrical, and the two ends of the torque transmission structure in the length direction are connected to an inner-end clamp and an external thin-wall gear through splines respectively; the strain gauge is fixed on the outer wall or the inner wall of the middle of the torque transmission structure in the length direction; according to the integrated gear clamp and the correction and calibration device provided by the invention, clamping and measurement of the thin-wall gear are integrated through the inner end clamp, the outer end clamp, the torque transmission structure and the strain gauge assembly, the structure is compact, centering installation and fastening clamping of the loaded thin-wall gear to be tested are met, and online measurement of the torque borne by the thin-wall gear is realized; the centering and torque transmission of the thin-wall gear are separated, high concentricity and large torque transmission are simultaneously met, and the high-precision test requirement is met; the strain gauge is arranged on the torque transmission structure to feed back torsional deformation in real time, the distance between the strain gauge and the tested thin-wall gear is controllable, external interference on test data is small, and the data are reliable.

The invention discloses an elastic material hydrofoil fluid-solid coupling cavitation erosion forecasting method based on a potential energy theory, and belongs to the field of computational fluid mechanics and cavitation. The implementation method comprises the following steps: simulating the cavitation of the hydrofoil made of the elastic material by using a tight coupling algorithm to obtain the pressure and steam volume fraction distribution of the surface of the hydrofoil; a steam volume fraction distribution based on pressure; constructing an erosion index correction factor F for representing the bending torsional deformation degree of the elastic material hydrofoil to correct the cavitation erosion index represented by the pressure wave power density; the cavitation erosion indexes larger than a threshold value are screened out, and the final cavitation erosion risk index is a quotient after superposition of the cavitation erosion indexes; the corrected cavitation erosion index data are interpolated into RGB color data, the data serve as a geometric structure model of a fourth-dimensional mapping elastic material hydrofoil, and the corrected cavitation erosion index numerical value is represented through color change. The corrected cavitation erosion index can more accurately forecast a cavitation erosion risk part on the surface of the hydrofoil made of the elastic material.

The invention relates to a multifunctional test loading device for simulating bending shear torsion performance of a wind power tower, which comprises a counter-force column, a counter-force longitudinal beam, a counter-force cross beam and four actuators, and is characterized in that the counter-force cross beam is fixed at the top of the counter-force longitudinal beam through a bolt and is connected with a first actuator for axially applying pressure; the bottom of the tower drum is connected and fixed through a loading support with a kidney-shaped hole, and the end of the tower drum is connected with a loading beam through a conversion piece and abuts against a first actuator for axial pressure applying and loading. A fourth actuator on one side of the reaction wall is used for applying horizontal shearing force and torque; second and third actuators on the upper and lower sides of the counter-force longitudinal beam are used for applying bending moment; according to the device, loading of multiple load types can be achieved on the tower drum, the complex stress condition possibly borne by the tower drum in the actual use process can be simulated, and loading of any change of a single load of the tower drum can also be simulated; the device is suitable for loading and fixing tower barrels of different types and sizes; and the influence of torsional deformation and horizontal displacement on vertical load loading can be reduced through structural measures.

The invention provides a vehicle body top cover structure, a railway vehicle, electronic equipment and a method. The car body top cover structure comprises a middle top cover, an air duct, a longitudinal beam and top cover edge beams, the air duct and the longitudinal beam are connected to the lower end of the middle top cover, the top cover edge beams are connected to the two ends of the middle top cover, the top cover edge beams extend in the length direction and divide the section of each top cover edge beam into a plurality of special-shaped cavities, and the cross section of each top cover edge beam is a special-shaped section with one end becoming wider from narrow. The thin end of the special-shaped section is connected with the middle top cover; the middle top cover comprises an upper face plate, a framework and a lower face plate which are sequentially stacked from top to bottom, the upper face plate, the framework and the lower face plate are connected through tough glue, a foam plate is embedded in the framework, and the longitudinal beams are arranged on the two sides of the air channel respectively. The top cover edge beam air conditioner bearing and lightweight design is achieved, and under the constraint conditions of air conditioner bearing, integrated overall deformation, torsional deformation and the like, overall deformation is controllable in the two-time vehicle weight ultimate bearing state.

The invention provides a large megawatt wind power gear box microcosmic modification method, and relates to the field of wind power gear box and gear microcosmic modification, and the method comprises the steps: constructing a planetary gear train rigidity finite element model, and obtaining the average value of the relative deformation of the center of a planetary gear bearing; a planet wheel bearing displacement finite element model is constructed, and radial displacement and tangential displacement of a planet wheel bearing are obtained; calculating the relative deformation of the planet carrier and the displacement of the planet wheel bearing according to the average value of the relative deformation of the center of the planet wheel bearing and the radial displacement and tangential displacement of the planet wheel bearing; a gear torsional deformation simulation calculation model is constructed, planet gear deformation, sun gear torsional deformation and primary internal gear deformation are obtained, and helical angle modification parameters are determined; constructing a planetary gear train gear modification simulation model, inputting the helical angle modification quantity parameter and the tooth top edge modification quantity parameter into the model, and obtaining a tooth direction reverse slope modification quantity parameter; and the machining modification amount is distributed according to the helical angle modification amount parameters through a helical angle modification amount conversion method.

A hybrid drive omni-directional motion actuator based on an origami structure, comprising at least one actuating module. The actuating module comprises a columnar shell deforming based on the origami structure, an upper cover plate and a lower cover plate. The columnar shell is the origami structure derived from Waterbomb crease, and a cavity containing gas is formed inside the shell. The two ends of the cavity are open, and the openings are respectively connected with the upper cover plate and the lower cover plate for blocking the openings. The lower cover plate is provided with vent holes communicating with the cavity, and the upper cover plate and the lower cover plate are pulled by driving ropes arranged in a crossed manner. Through the cooperation of gas and tendon drive, the columnar shell can have deformations of contraction, bending and torsion, so that a single actuating module has omni-directional movement capability.

The invention relates to a wind power tower bending shear torsion test loading anti-interference decoupling switching integrated device, which comprises a reaction wall, a support, a reaction column, a reaction longitudinal beam, a reaction cross beam and four actuators, and is characterized in that the top end of a fixed tower on the support is connected with a loading beam through a switching device; the first actuator applies axial load to the tower drum through the loading beam and the switching device, the second actuator and the third actuator apply bending moment to the end of the tower drum through the loading beam and the switching device, the fourth actuator is matched with the connecting piece, the rectangular steel plate is connected with the switching device to apply horizontal shearing force and torque to the end of the tower drum, and application and decoupling of various types of loads are achieved. The test precision is ensured; the device can truly simulate the load condition of the tower drum section, can also be matched with the loading beam to transmit the axial force, the bending moment, the shearing force and the torque to the wind power tower drum, and effectively solves the influence of horizontal displacement and torsional deformation on loading in the horizontal and vertical load coupling loading process in the wind power tower drum composite load simulation test.

The invention discloses a test device for measuring the compression strength of a composite material plate, which comprises an upper box body and a lower box body, a guide column is arranged between the upper box body and the lower box body, an upper clamping assembly is arranged at the lower end of the upper box body, a lower clamping assembly is arranged at the upper end of the lower box body, and the upper clamping assembly and the lower clamping assembly have the same structure and opposite installation directions. The upper clamping assembly or the lower clamping assembly comprises two wedge-shaped clamping block units which are oppositely arranged, and the end part of the test piece is clamped between the two wedge-shaped clamping block units. The invention also discloses a test method for measuring the compression strength of the composite material plate. The test device can stably work for a long time in high and low temperature environments, meets the test requirements of a compression test, adopts a split design, is rapid in clamping, can effectively resist bending and torsional deformation, improves the test efficiency and accuracy, keeps reliable clamping all the time in the test process, and is simple in structure and convenient to operate. And the problem of clamping failure caused by thermal expansion and cold contraction is effectively solved.

The application relates to a torsion extrusion device and method for enhancing torsion shear effect, which comprises an extrusion cylinder for arranging a blank to be extruded; a movable extrusion punch mounted in the extrusion cylinder and used for extruding the blank; and a multi-stage cavity rotary die connected with the extrusion cylinder and comprising a circular cross-section conical cavity, a first transition cavity, a wavy cross-section straight cavity, a second transition cavity and a circular cross-section straight cavity which are connected in sequence and integrally formed. Compared with the prior art, the application can solve the problem of slip in the torsion extrusion process and make the torsion deformation zone and the extrusion deformation zone of the material coincide, so as to enhance the torsion shear effect and realize good grain refinement effect.

The invention discloses a soft electrostatic torsion driving unit and method and a driver, the soft electrostatic torsion driving unit comprises an output part, a torsion deformation structure and a driving base which are connected in sequence, the torsion deformation structure comprises an elastic element and a flexible electrode, and the driving end and the driven end of the flexible electrode are relatively twisted by a set angle; the driven end of the flexible electrode is connected with the output part, and the driving end of the flexible electrode is connected with the driving base; two ends of the elastic element are respectively connected with the driving base and the output part, a conductive layer and an insulating layer are arranged on the driving base, and the active end of the flexible electrode is arranged above the insulating layer; a liquid dielectric output device is arranged in the driving base, an outlet of the liquid dielectric output device is located at the edges of the conducting layer and the insulating layer, and the elastic element is in a pre-tightening state; the invention has the advantages of compact structure, high driving efficiency, high response speed and large torsion angle, and can provide a new technical solution for the design of a complex flexible driving device.

According to the torsional deformation actuator based on the graphene film, mechanical gradients (including curvature gradients and density gradients) generated in the torsional deformation process of the graphene film are used as driving force to drive a nanometer sliding sheet arranged on the surface of the film to conduct radial migration, the annular graphene film is adopted, the inner diameter of the annular graphene film ranges from 5 nanometers to 500 nanometers, and the thickness of the annular graphene film ranges from 5 nanometers to 500 nanometers. The outer diameter is 20-1000 nanometers, the inner boundary is fixed, the outer boundary is used for applying torque to generate spiral wrinkles, and the movement speed of the solid slip sheet can be accurately controlled by adjusting parameters such as the magnitude of the torque, the applying direction and the duration time. The method does not need external physical field intervention, reduces the damage to the structure, has the remarkable advantages of high-efficiency conversion, high system stability, flexible parameter adjustment, accurate motion control and the like, is suitable for nanoscale self-cleaning, cluster driving and other applications, and provides a new solution for the development of the nanotechnology.

The invention discloses an omnidirectional energy collector based on a piezoelectric effect and an adjusting method thereof, and belongs to the technical field of energy collectors. According to the invention, omnidirectional energy collection can be realized, and the complex structure caused by arraying unidirectional collectors along different directions and the difficulty brought by signal processing are avoided; under the action of the mass block and the support slender rod, the bending deformation of the piezoelectric plate is greater than the deformation generated by only placing the side plate, and meanwhile, the defect of low torsional deformation voltage signal is avoided; the inherent frequency of the structure can be changed through the mass and the height of the mass block, resonance with the excitation frequency is achieved, bending deformation of the piezoelectric plate is increased, and therefore piezoelectric voltage output is improved. Due to the fact that the side plates have certain elasticity, when the mass block swings back, the side plates swing back, the structure that the side plates are arranged up and down is adopted, and motion interference generated when the side plates swing back can be effectively avoided.

The invention relates to the technical field of gantry crane dynamic operation safety testing, in particular to a crane dynamic operation safety testing method which comprises the following steps: step 1, multi-dimensional static calibration; step 2, fault coupling simulation; step 3, structured data processing; step 4, coupling judgment; step 5, source tracing; and step 6, carrying out targeted rectification. A multi-dimensional static calibration, fault coupling simulation and targeted rectification scheme is designed according to the structure and working conditions of cart one-way walking, main beam-supporting leg rigid welding, long track bearing, bilateral braking and open-air operation of the gantry crane. The limitation of insufficient adaptability to the integrated structure of the gantry crane in the prior art is broken through, and the problem of test distortion caused by neglecting equipment attributes is solved. Aiming at the characteristics that the box type girder of the gantry crane is large in torsional rigidity, small in torsional deformation and mostly caused by internal defects or uneven external stress, progressive traceability of internal defect detection, external load checking and connection state checking is adopted.

The invention relates to a forming and surface treatment method of a twisted waveguide, and belongs to the field of metal additive manufacturing technology and surface treatment. The manufacturing technical problems that parting manufacturing precision and reliability are poor, torsional deformation and position tolerance of torsional forming are not easy to guarantee, and a welding position is prone to deformation are solved, and the problem that a twisted waveguide not plated with a copper layer is large in microwave transmission loss is solved. The method comprises the following steps: modeling a designed twisted waveguide, and completing support adding and slicing processing; aluminum alloy powder is added into a forming equipment material cylinder; performing selective laser melting forming by adopting the slice file to obtain a twisted waveguide with a substrate and a support; separating the twisted waveguide from the substrate and the support; carrying out finishing processing on the twisted waveguide by adopting chemical polishing; and plating the twisted waveguide by adopting chemical plating to obtain the twisted waveguide with the plating layer. The additive manufacturing integrated forming and surface treatment process is adopted, the production period is effectively shortened, the product quality reliability is improved, and the microwave transmission loss is reduced.

The invention provides an equivalent helical structure optical fiber shape sensor. The equivalent helical structure optical fiber shape sensor comprises a multi-core optical fiber and a flexible capillary tube, and the multi-core optical fiber is inserted, pre-twisted and packaged in the capillary tube to form an equivalent spiral structure with a controllable screw pitch. According to the invention, a controllable spiral structure (the screw pitch adjusting range is 20-200mm) is formed in the optical fiber by applying torsion to the parallel optical fiber, compared with a parallel multi-core optical fiber scheme, the preset torsion rate can be accurately matched with the deformation mode of a target detection object, synchronous demodulation of bending curvature (the detection sensitivity is greater than or equal to 3.5 pm / mu epsilon) and torsional deformation (the angular resolution is less than or equal to 0.1 degree / m) is realized, and the detection accuracy is improved. The coupling error problem of a traditional sensor under the combined load is effectively solved.

The invention discloses a measuring device and method for correcting torsion errors of an inclinometer guide groove, and the device comprises a data collection mechanism, an inclinometer and an inclinometer guide groove torsion angle measuring mechanism which extends into the inclinometer and is connected with the data collection mechanism. A first guide groove, a second guide groove, a third guide groove and a fourth guide groove are sequentially formed in the inner wall of the inclinometer pipe in the circumferential direction at equal intervals. The method comprises the following steps of: 1, burying the inclinometer; 2, mounting a measuring device; 3, measuring the torsion angle of the inclinometer; 4, measuring the displacement of the inclinometer pipe; and 5, carrying out torsion correction calculation on the inclinometer guide groove. The measuring device formed by combining the angle sensor and the sliding guide wheel is matched with the pre-buried inclinometer pipe, the torsion angles of the four guide grooves in each measuring section in the inclinometer pipe can be obtained, the relative torsion deformation angle of each measuring point of the inclinometer pipe is obtained through torsion superposition calculation, displacement errors, measured by the inclinometer, in different directions are corrected, and the accuracy of the displacement errors is improved. The calculation method is scientific and reasonable, and can reflect the real deformation condition.

The invention discloses a twistable flexible mechanical arm and a robot, and belongs to the technical field of robots. The mechanical arm comprises a single-section continuum framework composed of a supporting disc and an elastic pipe, a torsional deformation driving mechanism used for driving the far-end supporting disc to rotate, and a bending driving mechanism composed of at least three driving ropes. The supporting discs except the far-end supporting disc are provided with guide holes allowing the driving rope to slide in the circumferential direction, and therefore decoupling of twisting and bending motion is achieved. The torsional deformation driving mechanism can adopt a central elastic hose mechanical driving scheme or an external magnetic field magnetic driving scheme. According to the invention, the single-section structure can simultaneously realize two bending degrees, one stretching degree and one independent active torsion degree of freedom, so that the tail end flexibility is obviously improved, and the single-section structure is suitable for narrow and small space operations such as medical minimally invasive surgery and precise assembly.

The invention discloses a fuel assembly deformation simulation device. The device comprises a supporting framework; the plurality of grillwork simulation pieces are sleeved on the supporting framework at intervals along the axial direction of the supporting framework; each positioning piece is respectively connected with the supporting framework and the grillwork simulation piece and limits the axial movement of the grillwork simulation piece along the supporting framework; the limiting pieces are inserted between the grillwork simulation piece and the supporting framework so as to adjust the radial relative position of the grillwork simulation piece and the supporting framework; and the plurality of simulation pipes are inserted into the plurality of grillwork simulation pieces. Full-size supporting force is provided through the supporting framework, the grillwork simulation piece simulates a real grillwork, the positioning piece positions the position of the grillwork simulation piece, the limiting piece adjusts deformation and torsion of the grillwork simulation piece, and the simulation pipe simulates a real fuel rod, so that bending and torsion deformation of each layer of the grillwork simulation piece of the fuel assembly can be flexibly adjusted. A complex deformation state in actual use is simulated, and the reliability and accuracy of a subsequent detection result are ensured.

The invention provides a differential mechanism assembly. The differential mechanism assembly comprises a differential mechanism shell, a transmission clutch assembly arranged on the right side of the differential mechanism shell and a differential clutch assembly arranged on the left side of the differential mechanism shell. The state of the differential mechanism assembly can be switched by controlling the states of the transmission electromagnetic actuator and the differential electromagnetic actuator, so that the differential mechanism assembly is switched among a differential state, a power disconnection state and a differential locking state according to needs, the phenomenon of power reverse dragging during high-speed running of a vehicle is avoided, and the service life of the vehicle is prolonged. The escape capability of the vehicle when the vehicle runs on an uneven road surface is improved; besides, in the differential locking state, the power transmission route of the differential assembly is optimized, it is guaranteed that power of a differential shell can only be transmitted to a left half axle gear through a planetary gear sleeve and a differential clutch ring in sequence, the stress uniformity of the planetary gear sleeve and the differential clutch ring is effectively guaranteed, and the service life of the differential assembly is prolonged. Torsional deformation caused by uneven stress of the planetary gear sleeve and the differential clutch ring is avoided, and the service life of the planetary gear sleeve and the differential clutch ring is prolonged.

The invention relates to the technical field of blade testing, and discloses a blade torsional fatigue testing system and method.The blade torsional fatigue testing system comprises a test bed foundation and at least one torsional vibration exciter, and the test bed foundation is suitable for fixing the root of a blade; the torsional vibration exciter comprises a vibration excitation unit and a blade clamp, the blade clamp is suitable for being clamped and fixed to a blade, the vibration excitation unit is fixed to the blade clamp, and the vibration excitation unit is configured to apply torsional loading to the blade. The blade root is rigidly fixed through the test bed foundation, and displacement interference in the non-torsion direction is prevented from being generated in the test process; a blade clamp of the torsion vibration exciter is clamped on a specified section of a blade, a vibration excitation unit is directly fixed on the surface of the blade clamp through a mechanical connecting piece, the vibration excitation unit generates periodically changing rotating torque during operation, the torque is transmitted to the blade through the blade clamp, and the blade is forced to generate reciprocating torsion deformation around the axis of the blade. And the torsional fatigue load under the actual working condition is simulated.