37 results about "Flexural torsional" patented technology

The invention relates to a device and a method for testing the structural fatigue of an H-shaped vertical shaft wind turbine blade. The device comprises a support base component, a distribution beam, a loading hoop, a support connecting rod and an eccentric motor, wherein the distribution beam, the loading hoop and the support connecting rod are connected together by using bolts so as to form a whole load distribution system, so that the fatigue load which acts in an upper and lower reciprocation manner can be effectively conducted. When the device is used for experiment, the fatigue bending moment distribution of the blade under various working conditions can be simulated by adjusting the length L of the distribution beam and the position B of the loading hoop, and the fatigue stress state of the blade in axial torsion and multiple attack angles can be simulated by adjusting the structural modes of the support base component and the loading hoop; the strain distribution of the blade under the fatigue loaded condition can be measured, and furthermore, the fatigue structural property of the blade can be evaluated; by only exerting one external fatigue load to the device, combined fatigue loading modes such as bending, torsion and multiple attack angles of the blade can be achieved, and the device is simple and convenient to operate, accurate and reliable in result and relatively high in universality.

The present invention relates to an aerofoil flutter speed determining method based on a transfer function. According to the aerofoil flutter speed determining method, an aerofoil flexural-torsional oscillatory differential equation and a Theodrosen unsteady aerodynamic model are utilized to obtain a long and straight aerofoil flutter differential equation, then Fourier conversion is performed on the aerofoil flutter differential equation, and the transfer function is used to solve the aerofoil flutter speed. The aerofoil flutter speed determining method has the beneficial effects as follows: (1) as the aerofoil flexural-torsional oscillatory differential equation is utilized to accurately describe the aerofoil oscillation and a low-order mode of the aerofoil oscillation is not adopted to approximately describe the aerofoil oscillation, the calculated aerofoil flutter speed is more accurate; and (2) compared to the prior art, the aerofoil flutter speed solving method is simpler.

An electrical feed through for use in a high temperature oven such as the oven in a gas chromatograph. The feed through includes printed circuit boards which are maintained in compression to prevent the boards from physically separating at the elevated temperatures used in the oven. The structure that provides the compression also does not allow any flexure, torsional or longitudinal stress on the boards. The boards include an enhanced connector pad which is made from a continuous annular copper ring which is connected to all of the conductive layers of the board.

The invention discloses a composite wire twisting and bending tester. The tester comprises a rack which is provided with a control system, a bending drive component and a twisting drive component, a rotating part is connected to the bending drive component, a rotating disc is arranged on the twisting drive component, and the rotating axis of the rotating part is perpendicular to the rotating axis of the rotating disc; the two ends of a tested wire are matched with the rotating part and the rotating disc respectively. According to the composite wire twisting and bending tester, the rotating part drives the tested wire to conduct a bending test repeatedly, the rotating part drives the tested wire to conduct a twisting test repeatedly, and the tester is suitable for high-flexible cables such as TUV, VDE and UL; all fixtures are adjustable, the bending and twisting tests can be conducted on other flexible specimens repeatedly, the application range is high, and the tester is suitable for the quality supervision industry, metal and machinery industry and manufacturers of cables and wires, steel wire ropes and the like.

The invention discloses a logical flexible body driving device with a fluid control function. The logical flexible body driving device with the fluid control function comprises a torsion pipe and twostretching pipes which are symmetrically arranged on the two sides of the torsion pipe. Sealing end caps are arranged at the same ends of the torsion pipe and the two stretching pipes, and air pipes are connected with the other same ends of the torsion pipe and the two stretching pipes. The logical flexible body driving device with the fluid control function is simple in structure. The logical control over the air pressure of a channel is utilized, the stretching movement, the bending movement, the torsion movement and other movement are simultaneously achieved, and therefore the diversity ofthe functions of the flexible body driving device is achieved.

The invention discloses a flutter wind tunnel test device for flexural-torsional rigidity decoupling, which comprises a cantilever steel beam for independently providing flexural rigidity and a torsional spring for independently providing torsional rigidity, wherein an aerodynamic lift surface is connected with a torque bearing support through a rotating shaft and the torsional spring, the torquebearing support is installed at the end of the cantilever steel beam, and the root of the cantilever steel beam is fixed to a low-speed wind tunnel. Bending and torsional rigidity decoupling of the flutter wind tunnel test device can be realized, the adjustable rigidity mechanism can ensure that the bending and torsional rigidity of the model is adjustable within a certain parameter range, and flutter wind tunnel test measurement with single rigidity parameter change can be realized.

The invention provides a flange tensile-flexural-torsional composite loading multi-bolt loosening testing machine, which can simultaneously apply tensile-bending-torsional composite load to a multi-bolt connected flange to study the bolt loosening characteristics. The testing machine belongs to the technical field of mechanical testing equipment. Transverse load generated by a three-phase asynchronous motor is taken as bending load applied to the flange, tensile force generated by a hydraulic puller is taken as axial tensile load, and torque generated by a servo motor is taken as torque load applied to the flange. Different from a conventional apparatus that applies two types of composite load to a single bolt, the testing machine can apply three types of composite load to the multi-bolt connected flange. The three types of composite load can be isolated from each other and do not interfere with each other, and load applied can be displayed in real time.

The invention discloses a flexible armor structure for protecting a cable and an assembly method, and the structure mainly comprises a flexible armor interface, a flexible armor outer ring, a flexiblearmor inner tube, a cable structural part, and a flexible armor inner tube and a flexible armor outer ring which are sleeved outside the cable structural part and are hooked and embedded end to end.The two ends of the flexible armor outer ring and the two ends of the flexible armor inner tube are fixed through flexible armor connectors, and the flexible armor connectors are connected with equipment in a butt joint mode. According to the invention, the multiple inner tubes and the multiple outer tubes are buckled, bending and twisting of the flexible armor can be achieved, the bending lengthof the flexible armor can be adjusted, and finally flexible connection is achieved; the manufacturing is simple and can be realized in a common machining workshop; under the condition that bending torsional deformation is met, load acting force in the axial direction can be achieved; and strong cable protection capability is achieved.

The invention discloses a spatial loading system and method suitable for flexural-torsional instability. The loading system comprises a to-be-loaded test piece, a counter-force frame, an electro-hydraulic servo actuator, a spherical hinge end head, a connecting clamp plate and a bidirectional follow-up device; the counter-force frame consists of a gantry counter-force frame and supporting seats attwo ends of the test piece; the to-be-loaded test piece is horizontally arranged in the gantry counter-force frame; two ends of the to-be-loaded test piece are connected with the supporting seats according to experimental requirements; the mid-span point of the to-be-loaded test piece is connected with the electro-hydraulic servo actuator through the connecting clamp plate and the spherical hingeend head; and one end of the electro-hydraulic servo actuator is connected with the counter-force frame through the bidirectional follow-up device. According to the spatial loading system and methodof the invention, the self-balancing of a force during test loading is realized through the gantry counter-force frame and the supporting seats; and with the connecting clamp plate adopted, it can beensured the effect of the force can be transmitted to the to-be-loaded test piece; and the translational movement and torsion of the electro-hydraulic servo actuator during spatial loading can be realized through the bidirectional follow-up device and the spherical hinge end head, and at the same time, it can be ensured that the loading direction of the electro-hydraulic servo actuator is verticaldownwards. The spatial loading system and method have the advantages of high accuracy, high stability and small interference.

The invention discloses an angle iron cross diagonal member stable bearing capacity test device and relates to the field of power supply test devices. The test device comprises two fixed structures, afirst supporting main material, a second supporting main material, a tension and pressure measurement assembly, a horizontal hydraulic jack and an electronic displacement meter, wherein the two fixedstructures are separately arranged, the first supporting main material and the second supporting main material are respectively hinged to one fixed structure, the tension and pressure measurement assembly comprises a height-adjustable pressure sensor which is fixedly arranged and used for measuring pressure or tension of the hydraulic jack, the horizontal hydraulic jack is fixedly arranged, and the electronic displacement meter is used for measuring displacement of the ends, far from the fixed structure of the first supporting main material and the second supporting main material. The angle iron cross diagonal member stable bearing test device disclosed by the invention takes restraining action of torsion rigidity of the other rod to a target press rod into consideration; compared with anexisting test device, a device platform which can detect flexural-torsional instability load data of angle iron members more reasonably and can obtain more accurate stable bearing capacity calculation values is provided.

The invention relates to a complex multi-curve aluminum plate enclosure system and a manufacturing method thereof. The method comprises the following steps that an enclosure top plate matched with a to-be-enclosed main body structure in shape is manufactured according to the bending and twisting shape of the to-be-enclosed main body structure; according to the bending and twisting shapes of the corresponding edges of the enclosure top plate and the to-be-enclosed main body structure, enclosure side plates matched with the enclosure top plate and the to-be-enclosed main body structure in shape are manufactured; the tops of the two enclosure side plates are connected to the two sides of the enclosure top plate, and the bottoms of the enclosure side plates are obliquely arranged towards the outer side of the enclosure top plate; mounting plates matched with the bottom edges of the enclosure side plates in shape are manufactured according to the bending and twisting shape of the bottom edges of the enclosure side plates; and the mounting plates are vertically connected to the bottoms of the corresponding enclosure side plates, so that the enclosure system is manufactured. The enclosure system can directly cover the main body structure, and is fixedly connected with the side part of the main body structure through the mounting plates arranged on the two sides, so that the traditional keel connection is omitted, and the problems existing in a transmission keel connection mode are solved.

The invention belongs to the technical field of high-speed steel, and particularly relates to a method for preparing a high-nitrogen high-speed steel gradient material by determining pressurized electroslag remelting pressure and dynamically adjusting pressure and an application. According to the method, the high-speed steel gradient material with the expected nitrogen content in gradient distribution is obtained by dynamically adjusting the pressure of pressurized electroslag remelting. The gradient distribution of nitrogen elements in an electroslag ingot is realized by utilizing the solubility difference of nitrogen under different pressures, the performance mutation of the electroslag ingot is effectively avoided, a contradiction between the hardness and the toughness of a traditional material is broken through, and hardness and toughness of the traditional material are more reasonably matched, so that the high effect gradient material which can bear load actions such as bending, twisting and impact vibration and the like with high-hardness, high-red-hardness and high-wear-resistance is obtained.

The invention discloses a crankshaft bending torsion combined load test device. A rack serves as a support, and a sliding rail, a lifting appliance, a bending clamp, a torsion clamp, a vibration exciter, a motor, an eccentric wheel and an electric control cabinet (comprising a power amplifier, a function generator and a dynamic strain gauge) are arranged in the rack. According to the invention, atorsion clamp and a bending clamp are lifted through a lifting appliance and a sliding rail, a crankshaft sample piece is fixed through the bending clamp and the torsion clamp, so that a proper test position is obtained on the rack, a vibration exciter vibration rod drives the torsion clamp to apply pulsating torque to the crankshaft, and the motor and the eccentric wheel drive the bending clamp to apply alternating bending moment to the crankshaft. During testing, frequency and amplitude signals are set and pass through the signal generator and the power amplifier, the vibration exciter and the motor are driven to output, so that the crankshaft is forced to vibrate, the output power is further adjusted and the vibration frequency is changed after resonance is realized, and the fatigue strength condition of the crankshaft is judged and analyzed through data of the strain gauge.

The invention discloses a high-flexibility anti-torsion composite cable for a robot. A control wire group, a plurality of power wire cores and a cotton silk filling rope are twisted to form a cable core, and the cable core is sequentially wrapped by a first shielding protection layer, a shielding layer, a second shielding protection layer and an external sheath from the inside to the outside. The power wire cores respectively consist of a conductor and an insulating layer wrapping the conductor. The control wire group is formed by the twisting of four control wire cores, and the control wire cores respectively consist of a conductor and an insulating layer wrapping the conductor. The cotton silk filling rope is formed by the twisting of the cotton silks. The cable is enabled to be flexible and elastic and to be resistant to bending and torsion through the development of a new material, a cable structure and the optimization design of the manufacturing technology. The cable can be widely used in the high-frequency and high-speed work environments of an industrial robot, can be widely used in occasions of frequent bending and moving, is high in resistant to wear and oil, and is long in service life. The number of bending and torsion times can reach 20,000,000.

The invention relates to the technical field of dredging engineering pipelines, in particular to a multi-layer reinforced dredging pipe and a forming process thereof. The multi-layer reinforced dredging pipe comprises a pipe body and flanges located at the two ends of the pipe body; the pipe body sequentially comprises a wear-resisting macromolecule layer, a warning macromolecule layer, a first composite reinforced layer, a steel wire reinforced layer, a steel wire filling layer, a second composite reinforced layer and an external-application macromolecule layer from inside to outside. The forming steps include mold preparation, laying of all functional layers, vulcanization forming and demolding. Compared with the prior art, the multi-layer reinforced dredging pipe has the beneficial effects that (1) the rubber macromolecule material is combined with the wound steel wire reinforced layer, so that on one hand, steel wires are fixed, and on the other hand, the damage effect of the steel wires on the pipe body after the pipe body is deformed can be avoided; and (2) the functional layers with different mechanical structures are firmly connected into a whole, so that the steel wires can be effectively prevented from being stripped under the action of long-term stretching and retracting, bending and twisting of the pipe body, and the problem that the pipe body of a dredging pipe is continuously subjected to fatigue damage in a severe environment is solved.

A rigidity control method for an aircraft high lift device comprises the steps that the rigidity of an airfoil structure is controlled according to the number and position of joints on a spanwise beam of the airfoil structure, the airfoil structure is divided into a plurality of sections in the spanwise direction, and spanwise and chordwise bending torsional rigidity parameters of the airfoil structure are obtained; the airfoil structure is simplified into a straight beam, the straight beam coincides with the spanwise beam, and a plurality of connectors connected to the spanwise beam serve as a plurality of supporting points of the straight beam; spanwise and chordwise deformation of an airfoil structure of the high lift device is taken as an optimization target, minimum support point bearing reaction difference is taken as a constraint condition, a fitness function of a straight beam support point position and quantity optimization problem is set, and optimization is performed to obtain support point positions and quantity meeting the constraint condition, wherein the positions and the number of the supporting points on the straight beams are the positions and the number of the joints on the spanwise beams.

The present invention relates to an aerofoil flutter speed determining method based on a transfer function. According to the aerofoil flutter speed determining method, an aerofoil flexural-torsional oscillatory differential equation and a Theodrosen unsteady aerodynamic model are utilized to obtain a long and straight aerofoil flutter differential equation, then Fourier conversion is performed on the aerofoil flutter differential equation, and the transfer function is used to solve the aerofoil flutter speed. The aerofoil flutter speed determining method has the beneficial effects as follows: (1) as the aerofoil flexural-torsional oscillatory differential equation is utilized to accurately describe the aerofoil oscillation and a low-order mode of the aerofoil oscillation is not adopted to approximately describe the aerofoil oscillation, the calculated aerofoil flutter speed is more accurate; and (2) compared to the prior art, the aerofoil flutter speed solving method is simpler.

The present invention discloses a novel flexile shearing strength and pressure sensor structure and a manufacturing method thereof, belonging to the field of micro electro mechanical systems (MEMS). The novel flexile shearing strength and pressure sensor structure can measure the shearing strength and the pressure. A flexible substrate is employed and has advantages of flexion torsion and hook face adaptation. A flexible substrate is attached on a glass sheet, silicon dioxide is sprayed on the flexible substrate, and an etching resistance layer, a measurement line and a heating unit form a sensor having a nanometer cavity allowing a heating unit and a measurement unit to be separated. The sensor can measure the shearing strength and the pressure and can achieve installation and measurementof the physical parameters at one time; the sensor employs the flexible substrate and has the flexion torsion and hook face adaptation; and moreover, the sensor has a high length-width ratio, is highin sensitivity and fast in response speed.

A method for acquiring outer contour data of a multi-curve torsional special-shaped structure building comprises the steps as follows: the outer contour projection points of 'ribs' of the multi-curve flexural-torsional special-shaped building are determined through 3D modeling; the height of the multi-curve flexural-torsional special-shaped building is determined by acquiring and using the apron absolute elevation and roof height point absolute elevation corresponding to the multi-curve flexural-torsional special-shaped building. The method has the benefits as follows: the technical defect that the outer contour data of the multi-curve flexural-torsional special-shaped building cannot be measured with the prior art is effectively overcome; the method has the characteristics of being high in use accuracy, convenient in measurement and high in measurement effect.

The invention discloses a machining process of a high-performance adapter for a drill stem. The machining process mainly comprises the following steps of preparation of an alloy structural steel smooth blank, heat treatment of an alloy structural steel bar body and machining of the inner shape and the outer shape of the adapter. The mechanical properties of the high-performance adapter processed according to the process are superior to those of domestic and overseas petroleum industry standards. When the adapter bears tension, compression, bending and torsional loads underground, an inner shoulder and an outer shoulder play a role as well, the stress sectional area of threads is increased, the threaded connection strength and the torsional strength of the adapter can be improved, and the probability of piercing leakage of a sealing face can be greatly reduced.

The invention discloses a stabilizing and supporting device for an automobile bumper. The device comprises a machine frame, a base and a hanging frame, wherein the base and the hanging frame are arranged on the machine frame; a rotating disc is fixedly arranged on the base, the rotating disc is connected with a seat, the seat is used for containing the bumper, a sliding groove is further formed inone side of the base, and an electrostatic eliminating device is fixed on the other side of the base; a supporting frame is arranged above the sliding groove, a bending torsion rod is arranged abovethe supporting frame, and the bending torsion bar is composed of a plurality of section bars and a plurality of supporting section bars; and the cutting surfaces of the section bars and the supportingsection bars are both inclined cutting surfaces, the front view figures of the sections bars and the supporting section bars are trapezoid shapes, a shortest edge and a longest edge are correspondingly arranged between the two inclined cutting surfaces of each section bar and the corresponding supporting section bar, the cutting surface of each supporting section bar is in spherical hinge connection between the inclined cutting surfaces of every two section bars, and supporting rods are connected in through pipes in a sliding mode. The device particularly solves the problems that in the priorart, the bumper is prone to deformation during drilling, the working efficiency is influenced due to the fact that a turnover device is not arranged, and an electrostatic treatment device is not arranged.

The invention discloses a twisted flexible cable for a robot arm. The flexible cable includes a cable core, and a first cladding layer made of polytetrafluoroethylene, which is sequentially coated on the outside of the cable core from inside to outside, The overall metal shielding layer made of copper-tantalum alloy wire winding, the second tape layer made of polytetrafluoroethylene and the outer sheath made of modified polytetrafluoroethylene material; the modified polytetrafluoroethylene The material is polytetrafluoroethylene as the base material, and polyether block amide is mainly added; the cable core includes multiple reinforcing cores and multiple three-wire assembly cores. The present invention provides a high tensile resistance, low friction coefficient, high torsion resistance and high wear resistance for high-speed movement, continuous bending and twisting, and the prior art cables are easily deformed and broken by the pulling force of the mechanical arm or towline system. Twisted flexible cables for robotic arms.

The invention discloses a method for improving the flexibility of an optical cable, which comprises the following steps: adding synthetic mechanical oil to the water tank of a water tank drawing machine, and heating the water tank; after pickling, phosphating, galvanizing and blanking Enter the stage of cold drawing; pass the cold drawn wire through the synthetic mechanical oil in the water tank drawing machine, pass the optical cable raw materials through the holes from large to small in turn, gradually make the diameter smaller, and then temper; The silk is the core, and the thin wire is wrapped outside the thick wire to make thick strands and thin strands respectively, and the thick strands and thin strands are oiled and coated; the rope is combined, and a thick strand is used as the rope core, and 4~ 6 thin strands are paired with 1 thick strand, and the thin strands are combined outside the thick strands. The strength of the cable core pulled out by this invention is reduced by 3-5%, the cable core is more flexible and bendable, and the number of torsion experiments is increased by 10-15%. The thick and thin wires are combined, and the thick and thin strands are combined to make the cable more flexible and fatigue-resistant.

The invention discloses a comprehensive performance testing platform for composite shaft tension, compression, bending, torsion and vibration, which includes a tension and compression unit, a bending unit, a torsion unit, and a vibration unit; the fixed end of the clamping device is fixed on the workbench; the invention integrates The static test of three single loads of tension, compression, bending, and torsion and the multi-load composite loading are integrated, and the rotation movement can be realized under any combination of tension, compression, bending, and torsion, so as to perform vibration tests and simulate the differences in actual production. Working conditions, the load space coupling model of composite load loading is established, which provides an effective test platform for studying the influence of various loads on material properties and the variation rules of other performance parameters, and promotes the research on actual complex working conditions to a certain extent. The exploration of the deformation and damage mechanism of materials solves the problems of complex operation and poor compatibility in current technology, and has the characteristics of simple operation, high integration, compact structure, diversified test modes, and rich test content.

The invention discloses a method and device for testing bending torsion mechanics performance of an H-shaped girder framework. The method comprises the following steps that firstly, a test platform is constructed, the two ends of one opposite angle of the H-shaped girder framework are placed on two bottom supporting bases, loading beams are placed at the two ends of the other opposite angle, beam loading supports are arranged below the two ends of the loading beams, the centers of the loading beams are provided with a loading hydraulic cylinder connected with a power pump and a loading instrument, the outer side faces of the middle portions of H-shaped girders at the two ends of the H-shaped girder framework are respectively pasted with five strain gages which are electrically connected with a balanced bridge and a computer, and displacement meters are placed at the positions, corresponding to the X-axis direction, the Y-axis direction and the Z-axis direction, of the two loading angles of the H-shaped girder framework respectively and electrically connected with the balanced bridge; secondly, the bending torsion testing is prepared; thirdly, loading testing is carried out, loading is carried out at random within the material elasticity range, the displacement and strain of the measuring position are obtained through the computer, the power pump is controlled through the loading instrument to enable the load to reach a target load, testing is repeatedly carried out three times, and mechanics performance testing under different loads can be achieved in sequence.