318 results about "Wear testing" patented technology

The invention discloses an axial-radial integrated loading rotating shaft bush high-temperature swing friction-wear testing machine, and belongs to the technical field of friction-wear testing, the axial-radial integrated loading rotating shaft bush high-temperature swing friction-wear testing machine comprises a bottom plate, a loading module is arranged on the bottom plate, one side of the loading module is connected with a high-temperature clamp module, one side of the high-temperature clamp module is connected with a motion generation module, and the motion generation module is connected with the loading module. One side of the motion generation module is connected with an electric control box body, and one side of the electric control box body is connected with a control computer. According to the axial-radial integrated loading rotating shaft bush high-temperature swing friction wear testing machine disclosed by the invention, synchronous application of an axial load and a radial load is realized through cooperative control of double stepping motors in the loading module; meanwhile, the influence of the coupling on torque measurement is effectively eliminated through the self-designed coupling, and the accuracy of synchronous application is improved.

The invention relates to a real-time wear test device for a cardiovascular implant mitral valve / tricuspid valve, which comprises a plurality of test mechanisms, and each test mechanism comprises a first compliance adjusting module, a second compliance adjusting module, a liquid flowing pipeline and a driving module, a valve carrier module and a return pipe are connected between the second compliance adjusting module and the first compliance adjusting module; one end of the liquid flowing pipeline is communicated with the first compliance adjusting module, and the other end is connected with the driving module; test liquid sequentially flows through the liquid flowing pipeline, the first compliance adjusting module, the backflow pipe, the second compliance adjusting module and the valve carrier module and flows back into the first compliance adjusting module and the liquid flowing pipeline so as to perform circulating reciprocating motion. According to the invention, a test environment highly similar to human physiological conditions can be simulated, so that the credibility and the accuracy of test results of the mitral valve and the tricuspid valve are ensured, and a real and reliable basis is provided for evaluating the service life of the mitral valve and the tricuspid valve.

This invention discloses a wear and tear testing device for textile materials, comprising a chamber and a rotating device within the chamber. An air diffuser is positioned at a specific location on the agitator of the rotating device, with the air diffuser direction at a 55-degree angle to the plane of the agitator. The diameter of the air diffuser is 1.2 mm. Pressure values ​​are set to suit different ranges of textile materials with varying unit surface mass. When the force value displayed by the sensor fluctuates within ±1% for 1.0 s, an alarm sounds. By setting parameters that correspond to the state of the chamber and the textile material, the testing time for textile material wear and tear testing is reduced. A locking device on the rotating position improves automation and testing accuracy.

The invention discloses a textile processing product detection device and a detection method thereof.The textile processing product detection device comprises a rack and further comprises a control box installed on one side of the bottom end of the rack, a friction structure arranged at the telescopic end of a lifting air cylinder, an isolation structure arranged on the outer side of the friction structure and a dust removal structure arranged on one side of the isolation structure; the friction belt is driven to move downwards and make contact with the fabric through stretching of the lifting air cylinder, the electric roller is started to enable the friction belt to conduct plane abrasion testing on the fabric, the telescopic air cylinder is started to enable the supporting roller to move downwards, then the friction belt and the fabric are pushed to be bent and deformed, and abrasion testing of the fabric in the bent state is simulated; and a multi-form testing function is realized, so that the device can comprehensively simulate the testing requirements of the fabric under various form changes such as bending, stretching and twisting, and the wear resistance of the fabric can be comprehensively and deeply evaluated.

This invention provides a testing device and method for corrosion and wear testing of sliding guide rails under corrosive environments. The device includes a support module, a drive module, a guide rail, a test slider, a tension sensor, a pull rod, and a test tank module. The test slider is slidably mounted on the guide rail and contains a counterweight to simulate a load. The drive module drives the pull rod to slide along the length of the guide rail. The tension sensor is connected between the pull rod and the test slider. The test tank module holds the test solution to simulate a corrosive environment. This invention features a compact overall structure, simple component installation, and a simple slider force transmission method. It can realistically simulate the corrosion and wear phenomena of the sliding guide rail moving pair under seawater conditions. Furthermore, the adjustable counterweight and replaceable test solution enable this invention to conduct corrosion and wear tests on moving pairs under different load conditions and corrosive environments.

The embodiment of the invention provides a shifting fork testing system, and relates to the field of speed change shifting fork testing. Comprising a tank body for containing lubricating oil and a protective cover detachably arranged on the tank body; the driving mechanism assembly comprises a rotary driving mechanism axially penetrating through one side of the groove body; the axial driving mechanism is arranged on the same side of the groove body in a penetrating manner through a transmission mechanism; the transmission mechanism is provided with a force sensor; the shifting fork clamping module comprises a mounting plate which is detachably arranged on the side wall of the groove body; the clamping piece is slidably arranged on the mounting plate, and one end of the clamping piece is detachably connected to the transmission mechanism; the two positioning blocks can be horizontally adjusted and locked on the mounting plate; the synchronous ring clamping module comprises a connecting end detachably connected with the rotary driving mechanism and a clamping end. The device can simulate the real working condition of a gearbox to carry out fatigue and wear resistance testing on the shifting fork, can achieve the testing of different models of shifting forks, is simple and convenient to operate, can improve the testing efficiency of the shifting fork, and can reduce the cost.

The invention relates to a high / low temperature wear-corrosion coupling damage test device and a quantitative evaluation method, and belongs to the technical field of wear corrosion test and material failure analysis. The device comprises a temperature-controllable corrosion test tank, a friction-wear test machine, an electrochemical workstation and a high-low temperature external circulation temperature controller, the temperature-controllable corrosion test tank is arranged on the friction-wear test machine, and friction-wear performance testing is achieved through reciprocating motion of the friction-wear test machine. And the temperature-controllable corrosion test tank is externally connected with an electrochemical workstation and a high-low temperature external circulation temperature controller and is used for testing corrosion performance and controlling temperature. According to the invention, high-precision testing and quantitative analysis of abrasion and corrosion of the metal-based material in high and low temperature environments are realized.

The invention relates to the technical field of wear resistance testing, and particularly discloses a textile wear resistance testing device which comprises a shell assembly, the shell assembly comprises a foundation plate, an upper shell is arranged at the top of the foundation plate, a first T-shaped groove is formed in the top side of the interior of the upper shell, and a pit is formed in the top of the foundation plate. A discharging assembly is slidably connected into the first T-shaped groove, a conveying assembly is arranged above the foundation plate, a placing assembly is arranged on one side of the conveying assembly, a first transmission assembly is arranged on the side face of the placing assembly, a to-be-ground workpiece is installed between the placing assembly and the conveying assembly, and a grinding measuring assembly is arranged above the to-be-ground workpiece. According to the grinding device, the grinding measuring assembly is arranged, the number of grinding measuring heads extending out of a rotating box can be changed by utilizing the initiative of a second motor and a third motor, the mechanical structure is changed, and therefore the grinding frequency of the grinding measuring assembly is changed.

The invention discloses a wear test device for reciprocating dynamic sealing of an actuator cylinder, and belongs to the technical field of actuator cylinder sealing wear test equipment.The wear test device comprises a main frame body and a test mechanism movably connected to the main frame body, a replaceable to-be-tested actuator cylinder structure is arranged on one side of the main frame body, and the test mechanism comprises a moving rod; the upper end and the lower end of the moving rod are provided with a limiting assembly and a counterweight assembly respectively, the moving rod is provided with a connecting piece, and the connecting piece is hinged to one end of a piston rod in the actuator cylinder structure to be tested. According to the method, the conventional motion of the output end of the actuator cylinder in a static state and the external non-axial acting force borne by the output end of the actuator cylinder in a dynamic state can be simulated, the reliability of the sealing ring in actual work can be comprehensively evaluated through combination of the two, verification is carried out from multiple dimensions, potential risks can be found, and the requirements of safety specifications in the fields of aviation, industry and the like are better met.

The invention relates to the field of wear resistance testing, in particular to an automatic testing method and testing equipment for wear resistance of a mobile phone protective film. According to the method, firstly, in the process that a polishing wheel rotates at different rotating speeds, abrasive paper of different mesh numbers and types is used for polishing the mobile phone protective film, and the target abrasive paper is combined with the mesh number of the target abrasive paper, rotating speed data of the target abrasive paper during polishing of the mobile phone protective film every time and a surface image of the mobile phone protective film after polishing of the target abrasive paper every time; the grinding effect value of the target abrasive paper during grinding of the mobile phone protective film each time is obtained according to the target abrasive paper and the surface distance between the mobile phone protective film and the grinding wheel after grinding of the target abrasive paper each time, and a sequence formed by the grinding effect values of all the abrasive paper during grinding of the mobile phone protective film each time is subjected to time sequence decomposition; and evaluating the wear resistance of the mobile phone protective film according to the data change of the trend term and the data distribution level of the residual term obtained through decomposition. According to the invention, the wear resistance of the mobile phone protective film can be evaluated more comprehensively and accurately.

The application discloses a high-bearing-column-piston pump friction pair friction and wear testing machine, wherein the lower sample is installed on a lower sample clamp, the lower end of the lower sample clamp is provided with a lifting mechanism for driving the vertical movement of the lower sample to make the lower sample contact or separate from the upper sample, and the upper end of the upper sample is connected with a rotary driving device for driving the rotation of the upper sample through an upper sample clamp. The loading of the testing machine is matched with a lead screw through an optimized mechanical structure design, the loading precision is high, the accuracy of experimental results is improved, stepless loading can be realized, and the testing machine is suitable for the friction and wear characteristic research of friction pairs under various pressures; the testing machine is provided with an oil collecting mechanism, the oil at any moment during the experiment can be collected, the change of the physicochemical indexes of the oil during the whole experiment can be detected, and the influence of the change of the physicochemical indexes of the oil on the friction and wear of the friction pair can be accurately analyzed.

The invention provides a friction and wear test device suitable for shaft seats of multiple specifications and a use method. The device comprises a test table board, an assembly type clamp, a crank-link mechanism and an oil cylinder loading system, the assembly type clamp is arranged on the test bench surface and is used for clamping the dual shaft; the dual shaft is used for mounting a shaft seat tested piece; the assembly type clamp comprises an inner side bearing base and an outer side bearing base which are both movably installed on the test bench surface. The dual shaft is rotationally connected with the crank connecting rod mechanism, so that the swing friction test of the dual shaft in the shaft seat tested piece is realized; and the oil cylinder loading system is arranged below the shaft seat tested piece and is used for providing radial pressure for the shaft seat tested piece. The distance between the inner bearing base and the outer bearing base can be adjusted through the inner bearing base and the outer bearing base which are movably mounted on the test bench surface, so that the device adapts to shaft seats with different lengths and is used for friction and wear tests of shaft seats with multiple specifications.

The invention discloses an aviation transmission part fretting friction wear test device and method, and belongs to the field of aerospace manufacturing, and the device comprises a supporting assembly, an axial force loading assembly, a transverse vibration assembly, a first test piece and a second test piece; the supporting assembly comprises a vibration platform, a first support and a second support, the first support is fixed on the vibration platform, the axial force loading assembly comprises a sliding plate, a servo motor, a lead screw and a nut, the sliding plate is in sliding connection with the vibration platform, the servo motor is connected with the lead screw, the nut is fixedly connected with the sliding plate, and the second support is fixed on the sliding plate; the transverse vibration assembly comprises a variable frequency motor, an eccentric wheel, a connecting rod, a vibration rod and a limiting plate, the variable frequency motor is fixed to the sliding plate, the eccentric wheel comprises a rotating shaft and an eccentric shaft, the variable frequency motor is in transmission connection with the rotating shaft, and one end of the connecting rod is rotationally connected with the eccentric shaft while the other end is rotationally connected with the vibration rod; therefore, the working condition of the aviation transmission part in a transverse vibration environment can be simulated.

The invention relates to the field of fretting wear testing, in particular to a high-temperature and high-pressure water impact fretting wear testing device and a using method thereof. The high-pressure kettle adopts a vertical structure that a lower base, a middle kettle body and an upper kettle cover are sequentially connected from bottom to top, the high-pressure kettle is fixed on a rack through the lower base, and a normal impact shaft connected with a driving mechanism extends into an inner cavity of the high-pressure kettle from the base and corresponds to the lower side of an impact material B in the inner cavity of the high-pressure kettle; the impacted material A and the impact material B correspond to each other up and down, the fixed base of the impact material B clamp is fixed at the top end of the normal impact shaft, the impact material B is driven to move up and down through the movement of the normal impact shaft, normal impact is performed on the impacted material A, and the impact fretting wear test is realized. The problems that in-situ impact fretting wear testing is difficult to complete in a high-temperature and high-pressure water environment, impact amplitude and frequency are difficult to accurately control, and plate-pipe or pipe-grillwork contact fretting wear testing is difficult to achieve are solved.

The present invention discloses a micro-friction and wear testing device and method for aviation transmission components, which belongs to the field of aerospace manufacturing. The device comprises a support assembly, an axial force loading assembly, a lateral vibration assembly, a first test piece and a second test piece. The support assembly comprises a vibration platform, a first support and a second support, the first support is fixed on the vibration platform, the axial force loading assembly comprises a sliding plate, a servo motor, a lead screw and a nut, the sliding plate is slidably connected to the vibration platform, the servo motor is connected to the lead screw, the nut is fixedly connected to the sliding plate, and the second support is fixed on the sliding plate; the lateral vibration assembly comprises a variable frequency motor, an eccentric wheel, a connecting rod, a vibration rod and a limit plate, the variable frequency motor is fixed on the sliding plate, the eccentric wheel comprises a rotating shaft and an eccentric shaft, the variable frequency motor is transmission-connected to the rotating shaft, one end of the connecting rod is rotationally connected to the eccentric shaft, and the other end is rotationally connected to the vibration rod, thereby simulating the working condition of the aviation transmission component in a lateral vibration environment.

The invention discloses an electronic component wear resistance testing machine, and relates to the technical field of electronic component testing. By arranging the abrasion testing head quick-changing mechanism, a rubber friction testing assembly, a steel wool friction testing assembly, an alcohol friction testing assembly and a standby testing assembly which are high in use frequency in the abrasion resistance testing process can be preset in advance, and the friction testing assemblies of the corresponding types can be quickly selected according to testing requirements before abrasion resistance testing is conducted on electronic elements; the positions of different types of wear-resistant test heads at different positions can be switched, compared with a traditional wear-resistant test head dismounting and replacing mode, the wear-resistant test head replacing speed is higher, the service time is shorter, operation is easy, the test piece efficiency of electronic elements can be improved, and the test efficiency of the electronic elements can be improved. The cleaning mechanism can utilize the suction power assembly to suck external air and purge high-speed flowing air to the electronic element in the test through the air nozzle, so that the effect of cleaning chippings falling off from the wear-resistant test surface of the electronic element is achieved.

The invention relates to the technical field of semiconductor manufacturing, and particularly discloses a method for evaluating and verifying material performance of a key component in a photoetching machine, which comprises the following steps of: S1, performing a simulation test on a novel material through a vacuum outgassing rate module to predict whether the vacuum outgassing rate of the novel material meets a vacuum environment stability requirement or not; s2, manufacturing a sample block corresponding to the novel material, and performing a counter-abrasion test on the sample block through a frictional wear test module so as to test whether the friction performance of the sample block meets the wear resistance requirement or not; and S3, replacing the material of the key part of the photoetching machine with the verified novel material, and carrying out complete machine version transfer test on the photoetching machine to evaluate the stability of the key part of the novel material in the real working environment and the complete machine matching degree. According to the invention, the problems that the cost is high and the safety risk is very easy to occur in the testing process due to complete machine testing when new materials of key parts are optimized, screened, evaluated and verified can be solved.

A test method for anti-slip long effectiveness of an anti-slip ceramic tile. The test method includes: performing a wear test on a testing surface of a to-be-tested anti-slip ceramic tile; performing an anti-slip performance test on the worn testing surface, to obtain a wear test value; and determining an anti-slip long effectiveness grade of the to-be-tested anti-slip ceramic tile according to the wear test value. In the embodiments, the worn to-be-tested anti-slip ceramic tile is subjected to the anti-slip performance test, to obtain the anti-slip long effectiveness grade, thus explaining the performance of the worn anti-slip ceramic tile, which is conductive to determining the long effectiveness anti-slip performance of the anti-slip ceramic tile, and provides the long effectiveness anti-slip performance test method and determination basis for the manufacturing of the anti-slip ceramic tile.

The utility model provides a novel flow distribution and wear testing device, include: linear force motor (1), valve core (2), through rod (4), reflector disc (5), laser displacement sensor (8), through rod (4) is connected with linear force motor (1), is driven by linear force motor (1) and does linear motion, valve core (2) is set up on through rod (4), and through rod (4) end is provided with reflector disc (5), laser displacement sensor (8) is set up to reflector disc (5) and is consistent with reflector disc (5) height, is used for emitting laser to reflector disc (5), and obtains the displacement of valve core (2) according to the laser signal of reflection. Can improve the repeatability, stability, accuracy of hydraulic element performance detection, improve the detection efficiency.

The invention discloses a processing method of a storage device, electronic equipment and a storage medium, the storage device is arranged in the electronic equipment after leaving a factory, and the processing method of the storage device comprises the following steps: when the electronic equipment is idle, carrying out wear test on all storage blocks in the storage device; wherein the memory device is not subjected to the wear test before leaving a factory; in the wear test process, responding to failure of executing the test instruction on any storage block, and marking the corresponding storage block as a bad block. Through the method, after the storage device leaves the factory, the wear test is performed on the storage device in the electronic equipment, so that the test task of a production test end on the storage device is reduced, the test cost of the storage device is effectively reduced, in addition, in the wear test process, bad blocks in the storage device can be marked, and the test efficiency is improved. Therefore, data loss caused by writing the data into the bad block is avoided.

A friction and wear test fixture with an adjustable slip-roll ratio and its design method, belonging to the technical field of friction and wear testing machines, includes a connecting column, a screw, an upper specimen bracket, a bearing, upper and lower specimens, and a locking device. The upper part of the connecting column is connected to the sensor connecting rod of the friction and wear testing machine, and the lower part is matched with the annular protrusion of the upper specimen bracket. The upper specimen bracket includes a middle plate-like structure, an upper annular protrusion, and two left and right cantilevers with different lengths below. The lower end of the cantilever is provided with a locking device for clamping the upper specimen. During operation, the lower specimen rotates actively, and the upper specimen is driven to rotate by friction. The present invention is simple and reliable in operation. By adjusting the installation angle, the research on the wear degree of materials and surface coatings under different slip-roll ratios can be carried out on a disc-type friction and wear testing machine. The upper and lower specimens can be replaced according to needs. It has a simple structure, is easy to operate, is suitable for slip-rolling tests between various materials and surface coatings, has good economy, is convenient to install, and has a good fixing effect.

The present invention relates to the technical field of wheel-rail double-disc rolling simulation, and specifically discloses a double-disc rolling rail specimen design method that takes into account the effect of bending stress. The present invention realizes the effect of bending stress on the extension of rail rolling contact fatigue cracks on the double-disc rolling specimen, and combines finite element analysis methods and rolling contact fatigue and wear testing machines, SEM scanning electron microscopes and other equipment to analyze the cross-sectional crack morphology and maximum bending stress value σ of the double-disc rolling rail specimen. simRmax The cross-sectional shapes of the specimens are optimized according to the analysis results until the crack morphology of the specimen cross section is close to the crack morphology of the rail cross section after field service, and the total height H of the simulated beam cross section of the specimen is continuously modified until it meets σ simRmax =σ Rmax , and then combined with the rolling contact fatigue and wear testing machine to verify the rationality of the test structure again, to ensure that the rolling contact fatigue crack damage of the full-size rail under bending stress can be reproduced in the laboratory.

This utility model discloses an adjustable cantilever for OPC wear testing, including a support base. A positioning column is connected to one side of the support base, and a telescopic groove is formed on the other side. An adjusting column is slidably installed inside the telescopic groove. A drive motor is mounted on one side of the positioning column, and a rotating shaft is rotatably mounted on one side of the adjusting column. Both the output ends of the rotating shaft and the drive motor are connected to support covers. An adjusting frame is provided on the surface of the support base, and a testing cantilever is rotatably installed inside the adjusting frame. A cantilever adjustment mechanism is provided between the testing cantilever and the adjusting frame. This utility model has the following advantages: it stably clamps both ends of the OPC drum to be tested within two support covers. The cantilever adjustment mechanism allows for free adjustment of the testing cantilever, thereby adjusting the testing position and pressure on the OPC drum surface during wear testing. This more accurately simulates the wear condition of OPC in actual use, improving the accuracy and reliability of the measurement results.

The utility model discloses a high pressure oil pipe wear testing machine, including testing machine main part, rubber pipe fixed component, polishing subassembly and drive assembly, rubber pipe fixed component is including rubber pipe fixed spare, polishing subassembly is located the top of rubber pipe fixed component, polishing subassembly at least includes slider assembly, mobile seat, connecting rod, weight and polishing block, the output of drive assembly is connected to one end of rubber pipe fixed component, makes drive assembly control rubber pipe fixed spare rotation, the other output of drive assembly is connected to mobile seat, makes drive assembly control mobile seat along the extension direction of slider assembly and moves, to make polishing block and rubber pipe fixed spare resist and along the extension direction of rubber pipe fixed spare to and fro movement, thus, drive mobile seat and drive polishing block along the accurate reciprocating linear motion of oil pipe length direction, realize the oil pipe on rubber pipe fixed component and carry out friction movement to guarantee the laboratory simulation of oil pipe high efficiency, accurate, reliable.

The present invention discloses a method and device for testing the tangential stiffness of a material friction and wear testing machine system. The method comprises a base, a lifting mechanism, a connecting plate, a micro-electric cylinder, a grating support rod, a loading rod, a frame mounted on the base, a normal load loading mechanism, and a laser interferometer. The lifting mechanism is mounted on the frame, the connecting plate is mounted on the lifting mechanism, and the micro-electric cylinder and grating support rod are both mounted on the connecting plate. The loading rod is connected to the micro-electric cylinder, which drives the loading rod to perform horizontal reciprocating motion. The loading rod is provided with a lower fixture and a grating fixture, and the grating support rod is provided with a grating displacement sensor located above the grating fixture. The normal load loading mechanism is provided with an upper fixture located directly above the lower fixture. The testing device and method provided by the present invention can test the tangential static and dynamic stiffness of a friction and wear testing machine system, and has high testing efficiency and accuracy.

The utility model relates to the field of abrasion testing machines, and discloses a multifunctional reciprocating friction abrasion testing machine which comprises a working table, a supporting frame is fixedly connected to the upper side of the working table, hydraulic rods are fixedly connected to the two sides of the upper portion of the supporting frame, and the output ends of the hydraulic rods are fixedly connected with a supporting plate. The lower side of the supporting plate is fixedly connected with a fixing frame, the upper side of the supporting plate is fixedly connected with a first motor, the output end of the first motor is fixedly connected with a rotating block, the lower side of the rotating block is fixedly connected with a first rotating plate, and the first rotating plate is rotationally connected with a second rotating plate through a first rotating shaft; and the second rotating plate is rotationally connected with a sliding block through a second rotating shaft. According to the utility model, the to-be-processed product can be conveniently driven to be conveyed, the accuracy of the to-be-processed product during testing is improved, the device has higher precision and repeatability, and consistent results can be obtained in multiple tests.

The invention belongs to the technical field of chain friction and wear testing equipment, and particularly relates to a large-specification chain pin shaft-sleeve pair friction and wear testing machine and a testing method. The testing machine comprises a control system, a workbench, a motor, a speed reducer, a coupler, a crank rocker mechanism, a rocker shaft, a transmission shaft, a torque sensor, a bearing seat, a pin shaft-sleeve pair, a pressurization fixing mechanism, an oil injection mechanism, a support and a pressure sensor. The oil injection mechanism injects lubricating oil to the two ends of the pin shaft-sleeve pair through a hydraulic oil pump and is used for simulating the oil injection lubrication mode in the actual working condition. The pressurization fixing mechanism is used for accurately simulating the positive pressure between the pin shaft-sleeve pair, and the crank rocker mechanism is used for accurately controlling the relative swing angle of the pin shaft-sleeve pair. And the control system is used for calculating the friction coefficient and drawing a friction coefficient curve so as to analyze the correlation between the positive pressure, the torque, the motor rotating speed, the oil temperature, the lubricating oil flowing condition and the friction and abrasion between the pin shaft and the sleeve.

This invention provides an experimental device for friction and wear testing of an artificial knee joint, belonging to the field of material friction and wear technology. It includes a lifting module, with a femoral clamping module at its top. The femoral clamping module contains a polyurethane elastomer sealed chamber, and a tibial clamping module is connected below this chamber. An intelligent temperature-controlled circulating hydraulic pump is located on one side of the polyurethane elastomer sealed chamber. This invention achieves reciprocating motion through a reversing valve control. Combined with sub-millimeter precision adjustment of the hydraulic actuator and differentiated installation positions, it realizes high-precision flexion, extension, and torsional movements of the artificial knee joint. A stable base load is provided by a central hydraulic loading module, while the unnecessary torque from the dual electromagnetic loading modules cancels each other out. Simultaneously, instantaneous impact force is superimposed on the stable hydraulic load through instantaneous power switching, enriching the loading methods of the experimental device for friction and wear testing of an artificial knee joint.

The application relates to the technical field of acoustic signal processing and fault diagnosis, and discloses an engine alloy component wear testing method and system based on acoustic emission. The method comprises the following steps: acquiring continuous acoustic emission signals of an engine alloy component during operation and dividing the signals into multiple data frames, the signals being collected by an acoustic emission sensor; extracting a spectrum time domain feature set and an energy domain feature set based on a Teager-Kaiser energy operator for each data frame, and concatenating the two feature sets after Z-score standardization to form an initial combined feature; independently clustering in two feature spaces to generate a composite cluster label, and calculating the local covariance matrix of each composite cluster; constructing a sample relation graph with the data frames as nodes, for any two data frames, fusing the Euclidean distance between the initial combined features of the two data frames and the Riemann distance between the local covariance matrices corresponding to the composite cluster labels to which the two data frames belong through a kernel function to obtain an edge weight; and combining part of the labeled samples and determining the wear states of all the data frames through a label propagation algorithm. The application improves the accuracy of wear state recognition.