36 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 invention discloses a reinforcement device for preventing flexural-torsional buckling of angle steel for iron towers. The reinforcement device comprises a restraint component outside the angle steel and a ribbing restraint component inside the angle steel. The restraint component is an 'L'-shaped supporting plate I, the ribbing restraint component comprises an 'L'-shaped supporting plate II, and a plurality of reinforcement rib plates with rectangular cross sections are arranged at intervals inside the 'L'-shaped supporting plate. A gap for clamping the angle steel is formed among the 'L'-shaped supporting plate I and each reinforcement rib plate, and the 'L'-shaped supporting plate I and the 'L'-shaped supporting plate II are assembled together to form an external square reinforcement device.

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 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 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 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 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 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.