284 results about "Cyclic test" patented technology

The invention provides a pattern multi-row matching method and device for ATE equipment, and the method comprises the steps: determining a cyclic pattern sequence comprising a plurality of rows of target patterns based on the number of matched rows when a first to-be-tested pattern carrying a LOOPMATCH instruction is recognized after a test is started; lOOPMATCH circulation is executed on the basis of the circulation Pattern sequence, and in each LOOPMATCH circulation, the Pattern matching result of the target Pattern in each row is determined; when all Pattern matching results pass in one cycle, jumping out of the LOOPMATCH cycle and determining that the cycle Pattern sequence test passes, otherwise, continuing to circulate to the maximum cycle number and then determining that the cycle Pattern sequence test does not pass; according to the technical scheme of the embodiment of the invention, when the first to-be-tested Pattern carrying the LOOPMATCH instruction is detected, multiple rows of target Patterns are constructed for loop testing, and LOOPMATCH loop is jumped out after any complete matching succeeds, so that the depth of the Pattern sequence can be effectively reduced, multi-row synchronous multi-time level matching is realized, the test resource overhead is reduced, and the test efficiency is improved.

The invention provides a sealing ring performance test system and method. The sealing ring performance test system provided by the invention comprises a test tool which comprises an upper flange and a lower flange which are matched with each other, the lower flange is provided with a sealing groove and a leak detection hole communicated with the sealing groove, the sealing groove is formed in one side, facing the upper flange, of the lower flange and is used for installing a sealing ring to be tested, and the leak detection hole is communicated with the leak detection hole; one end of the leak detection hole is communicated with the sealing groove, the other end of the leak detection hole is used for detachably installing different performance testing devices, and the different performance testing devices comprise a cold and hot state leakage performance testing device, a water pressure performance testing device, a thermal cycle testing device and a stress relaxation testing device. The system and the method provided by the invention are used for testing the performance of the sealing ring and ensuring the sealing effect and the reliability of the sealing ring under the actual working condition.

The invention provides a silicone rubber aging test method and device, electronic equipment and a storage medium, and relates to the technical field of silicone rubber. The silicone rubber aging test method comprises the following steps: according to a preset actual application environment of target silicone rubber, determining cycle test parameters of preset aging factors corresponding to the actual application environment; determining an acceleration factor of the aging test according to the cycle test parameters and a preset calculation mode; performing thermogravimetric analysis on the target silicone rubber according to the cycle test parameters to determine mass loss parameters of the target silicone rubber; and determining an aging test result according to the elongation at break, the acceleration factor and the mass loss parameter of the target silicone rubber. According to the method, the aging performance of the target silicone rubber is integrally and comprehensively evaluated by combining multiple indexes such as the elongation at break, the acceleration factor and the quality loss parameter, and the test efficiency is improved.

The invention provides a power cycle test method for a power device, and the method comprises the steps: carrying out the initial detection of a to-be-tested power device, obtaining an initial threshold voltage, and carrying out the power cycle test of the to-be-tested power device; under the condition that the to-be-tested power device is turned off in one power cycle and the junction temperature of the to-be-tested power device is reduced to a preset temperature condition, detecting to obtain a test threshold voltage of the to-be-tested power device, and calculating to obtain a threshold voltage change rate according to the initial threshold voltage and the test threshold voltage; and whether the to-be-tested power device is aged and fails is judged according to the threshold voltage change rate. According to the method, characteristic parameters collected in the power cycle process are calibrated in real time, whether a chip fails or not and packaging fails is judged according to parameter deviation values, threshold voltage is accurately tested in the power cycle turn-off process, and then on-line collected conduction voltage drop is calibrated; and synchronous online monitoring of the reliability and the packaging reliability of the silicon carbide chip is realized.

The invention discloses a method for calculating the real-time hydrogen storage amount and the remaining endurance mileage of a fuel cell vehicle, and belongs to the solid hydrogen storage amount measurement technology of a fuel cell. The method comprises the following steps: firstly, carrying out calibration and cycle test analysis on a hydrogen storage material, including establishing relationships between hydrogen storage capacity, temperature and pressure in a full life cycle of a fuel cell stack; the initial hydrogen storage amount is obtained when the vehicle is started, and the obtaining mode comprises the steps that the temperature of the hydrogen storage device and pressure sensor data are read based on the FCU to convert and calculate the initial hydrogen storage amount; when the vehicle runs, the hydrogen consumption amount of the fuel cell stack and the remaining hydrogen storage amount in the hydrogen storage device are calculated in real time, the remaining endurance mileage is calculated in real time on the basis of the remaining hydrogen storage amount, and calculation includes calculation based on the driving mileage within the time t1 to t2 and the hydrogen consumption amount. The method can overcome the defect that in the prior art, the error of estimating the hydrogen storage amount based on thermodynamics in the vehicle running process is too large, the estimation precision of the real-time hydrogen storage amount in the hydrogen storage device is improved, application of hydrogen energy to new energy vehicles, ships and aircrafts can be promoted, and precise prediction of endurance is improved.

The invention relates to the technical field of safety performance testing, and discloses an anti-falling waistcoat protection performance testing method and system. According to the method, a bionic human body model is driven through a multi-degree-of-freedom impact simulation device, a standard test dummy wearing an anti-falling waistcoat is impacted in multiple preset postures including the combination of a pitch angle and a roll angle, and a real falling scene is simulated; a flexible piezoresistive sensor array embedded into the inner layer of the waistcoat is used for collecting dynamic pressure distribution data in real time, and an air bag unfolding time sequence image is synchronously recorded; calculating a pressure dispersion rate based on the pressure data, determining protection response delay in combination with image analysis, and generating an attitude adaptability evaluation index through a multi-attitude test result; and finally, executing a continuous inflation and deflation cycle test to evaluate the sealing performance and the sensor stability. According to the method, the dynamic protection performance, the airbag response efficiency and the long-term use reliability of the anti-falling waistcoat in a complex impact posture can be comprehensively detected, and the consistency of a test result and an actual protection effect is improved.

The invention discloses an automobile coating corrosion resistance test method. The automobile coating corrosion resistance test method comprises the following steps: (1) performing test pretreatment on a tested sample; (2) corrosion resistance tests are carried out for 10-25 cycles, each cycle comprises a phase A test, a phase B test, a phase C test and a phase D test, the phase A is a neutral salt spray test, the phase B is an artificial bird droppings corrosion test, the phase C is a temperature and humidity alternating test, and the phase D is a high-pressure flushing test; and (3) after the cyclic test is finished, testing the corrosion resistance index of the coating. According to the method, outdoor driving and parking scenes can be better simulated, the coupling effect of various conditions and corrosive media on coating corrosion is reflected, and a more accurate theoretical basis is provided for design and development of automobile coating products.

The invention relates to the technical field of microswitches, and discloses a microswitch contact life test method and system, and the method comprises the steps: carrying out the contact preheating operation and resistance reference measurement of a microswitch, and obtaining a contact resistance reference value and an initial fluctuation characteristic spectrum; setting a contact degradation monitoring threshold value based on the contact resistance reference value and the initial fluctuation characteristic spectrum; placing the microswitch in a test device for loop test, and recording a contact state data set in each test period; performing weighting processing on the contact state data set according to a test period, and calculating an average resistance fluctuation metric value and a contact degradation evaluation index; and performing dual-mode contact failure detection based on the average resistance fluctuation metric value and the contact degradation evaluation index, and generating target early warning signals of resistance abrupt change type and gradual change type failure modes, thereby improving the identification capability of different types of microswitch contact failure modes, and effectively avoiding sudden faults of equipment caused by contact failure.

The invention relates to the technical field of adhesives, in particular to a tensile test system for a structural adhesive, which is characterized in that a first sample group and a second sample group are prepared through a sample preparation unit; aiming at a plurality of sample subgroups in the sample group, standard tension test, dynamic tension test and cyclic tension test are respectively carried out through the standard test unit, the dynamic test unit and the cyclic test unit, and the data acquisition unit acquires test data in the tension test process in real time; in addition, the intelligent control unit controls the tension testing machine in the corresponding tension test through the standard tension increasing rate, the dynamic tension increasing rate and the circulating tension increasing rate; the intelligent control unit also controls the temperature of a test environment, and tension tests are carried out under different temperature conditions; the data analysis unit analyzes the tension test data to obtain a tension test result; the intelligent tension test system provided by the invention has high flexibility and adaptability, and can obtain a more accurate tension test result.

The invention relates to the technical field of aircraft part detection, and particularly discloses an intelligent detection device for aircraft part processing, which comprises a box-type base, a mounting groove, a simulation mounting mechanism, a test mechanism, a top reset mechanism, a top shell, a controller, temperature adjusting equipment and humidity adjusting equipment, the simulation mounting mechanism can simulate flight vibration; the testing mechanism is arranged at the top end of the mounting groove and located on the rear side of the mounting groove, and the testing mechanism can simulate the using action of a passenger; the top resetting mechanism is arranged above the testing mechanism and can be used for resetting assistance and cyclic testing. Through the detection mode of scene simulation and automatic operation, the problem that a traditional single vibration or isolated action test is disjointed with an actual scene is solved, the detection efficiency and reliability are improved, the performance of the seat in an extreme environment is reflected more accurately, and a core guarantee is provided for aviation safety.

The invention provides a battery failure prediction method and device, a storage medium and a program product, and relates to the technical field of batteries. The battery failure prediction method comprises the steps of obtaining cycle test data of a battery; calculating the cycle test data of the battery to obtain a plurality of dimension curves, wherein the plurality of dimension curves comprise SOH curves; the number of first alarm points existing in the multiple dimension curves is obtained, and in each dimension curve, the situation that each feature exceeds the feature threshold value of the dimension curve is recorded as the situation that one first alarm point exists; performing inflection point detection on the SOH curve to obtain the number of inflection points in the SOH curve; and determining whether the battery fails or not according to the number of the first alarm points and the number of the inflection points. According to the invention, the accuracy of failure prediction of the battery is improved.

The invention provides a depth evaluation method and system for an on-die ECC (Error Correction Code) memory, and the method and system for depth evaluation for the on-die ECC memory are characterized in that an ECS (Error Correction System) is introduced to record the number of actual repairs and errors in the memory; the method comprises the following steps: performing multi-round cyclic ECS test on an on-die ECC memory according to gradually-rigorous test parameters by opening and closing a manual ECS mode of the on-die ECC memory so as to obtain a fault frequency evolution table; and comparing the fault frequency evolution table with a pre-obtained natural test fault table of the on-die ECC memory to obtain the test parameter margin of the on-die ECC memory, the maximum tolerable fault number and the residual percentage of the maximum tolerable fault number, so that the real evaluation condition of the on-die ECC memory is reflected, the condition of test distortion caused by ECC self-repairing is avoided, and the test efficiency is improved. And the accuracy and authenticity of memory testing are improved.

The utility model discloses an anticorrosive paint testing device. The anticorrosive paint testing device comprises a shell, a sample bin, a sample rack, a servo motor and an electric control assembly, the shell is composed of a first cylinder and a second cylinder, the space between the first cylinder and the second cylinder is equally divided into a first testing bin, a second testing bin and a third testing bin through partition plates, and three first open holes are evenly distributed in the second cylinder; the back of the shell is sealed by a circular sealing plate, a servo motor is arranged in the center of the back of the shell, an openable sealing door is arranged on the front of the shell, a group of supporting legs are connected to the bottom of the shell, and an electric control assembly is arranged on the left side of the shell; the sample holder is of a rectangular flat plate structure, mounting grooves corresponding to the mounting protruding blocks are formed in the edges of the sample holder, and the sample holder is placed in the sample bin in a sliding mode and is convenient to take and place. The device provided by the utility model can be used for carrying out a cyclic test of salt mist aging-ultraviolet aging-drying and accurately simulating the corrosion condition under natural conditions; different testing environments can be automatically switched, labor is saved, and testing time is shortened.

The invention relates to a strengthening test method for a low-position picking vehicle, and the method comprises the following steps: designing a circulation path which is provided with a straight road section and a turning road section, and is provided with a following motion test point; cyclic test: enabling the test vehicle to start from the starting point and run along the cyclic path until the test vehicle returns to the starting point under different load conditions in sequence; in the running process, when the test vehicle runs to the following action test point, carrying out a following action test; and the cyclic test is repeated until the test time is reached. The invention provides a strengthening test method which is more fit with the actual working condition of the low-position picking vehicle, can simulate the extreme working condition of the low-position picking vehicle in the actual use environment, and can comprehensively evaluate the mechanical structure strength, the electrical system stability and the hydraulic system durability of the vehicle.

The invention belongs to the technical field of metal plate processing and testing, and particularly discloses a device and method for testing the bending forming capacity of a metal composite plate. The device comprises a test base, a movable heating mechanism which slides and can be locked on the test base, a bending test mechanism rotationally connected to the test base, a fixed hydraulic mechanism, a first driving motor and a second driving motor, a heating element is arranged in the movable heating mechanism, so that the plates can be uniformly heated on line; the bending test mechanism controls the clamping force and the bending angle of the bearing through a servo motor in a closed-loop manner, and collects pressure and angular displacement data in real time; and the hydraulic telescopic head of the fixed hydraulic mechanism executes reverse pushing after single bending, so that a fatigue cycle test is realized. According to the invention, normal-temperature / thermal-state multi-angle bending and fatigue testing can be carried out on metal composite plates with different specifications, the forming limit and layering failure critical parameters are rapidly obtained, and the process optimization efficiency and the product reliability are improved.

The invention discloses a permanent magnet motor magnet performance degradation evaluation method, belongs to the field of permanent magnet motor tests, and is used for solving the technical problem that reversible demagnetization and irreversible demagnetization are difficult to effectively distinguish in the prior art. The method comprises the following steps: step 1, installing a selected adaptive permanent magnet rotor assembly on a motor installation seat of a test bed; 2, hardware debugging is completed; 3, test parameters are set, and a cooling module is started; 4, starting the to-be-tested permanent magnet motor according to a set rotating speed, gradually applying a load by a loading device according to a test requirement, and monitoring the running state of the motor in real time; step 5, collecting performance data of the permanent magnet motor to be tested according to a preset sampling frequency; step 6, repeating the steps 2-5 to carry out a cyclic test, wherein the cumulative operation time is greater than or equal to 100 hours; sampling is conducted after circulation, and the coercive force change rate delta Hcj and the residual magnetism change rate delta Br of the sample are measured. According to the invention, whether irreversible performance degradation of the magnet occurs can be determined.

The invention relates to the technical field of power cycle tests, in particular to a test method for automatically interspersing static characteristic tests in a power cycle test, which comprises the following steps of: 1, performing a power cycle test on a tested sample, and judging the aging degree; counting the cycle number of the power cycle test; 2, judging whether the cycle number of the power cycle test reaches a preset value N or not, if yes, pausing the power cycle test, waiting for state recovery, and executing the step 3; if not, continuing to execute the step 1; 3, stopping the power cycle test, and entering a static parameter test; 4, all interspersed static parameter tests are finished, a power cycle test is recovered, and an interspersed transient thermal test is carried out; 5, judging whether a stop condition is triggered or not, and if yes, executing the step 6; if not, executing the step 1; and step 6, ending the loop test. Static parameter testing can be interspersed in power cycle testing, and the overall reliability of the tested sample is improved.

The invention provides a plastic pipe service life test method and device, and the method comprises the steps: filling a low-level water tank and a circulation test pipeline communicated with the low-level water tank with a test solution, injecting the test solution into a high-level water tank communicated with the low-level water tank, and enabling the interior of the high-level water tank to have a preset test solution initial volume; wherein the high-level water tank is higher than the low-level water tank by a preset height, and a gas phase space is formed at the top of the high-level water tank; charging compressed gas into the gas-phase space to enable the gas-phase space of the high-level water tank to have preset pressure so as to apply back pressure to the test solution in the low-level water tank; under the back pressure condition, heating the test solution in the low-level water tank to a target test temperature; the backpressure condition and the target test temperature are maintained, and the service life of the plastic pipe sample in the circulation test pipeline is tested. Through the integrated structure and process design, the system is in a stable high-temperature and high-pressure test state, the energy utilization efficiency is improved, the operation cost is reduced, and the test efficiency is improved.

The invention discloses a pressure sensor core body test system of a high-frequency response structure, relates to the technical field of sensor core body test, and improves the pressure sensor core body test efficiency. According to the method, the deviation drawing relation equation of the pressure sensor under each cycle test under different test pressure values is obtained according to the static test signal set, and the deviation value curve of each cycle test is established through the dynamic test signal set, so that the deviation value curve of each cycle test is obtained under each cycle test period. Detecting a relation equation between a time point and a corresponding deviation value in the deviation value curve, and inputting the static detection difference value curve and the test error value curve into a corresponding deviation drawing relation equation and the relation equation to obtain a static boundary error curve and a dynamic boundary error curve; and judging whether the test pressure sensor is qualified or not according to comparison results between the static boundary error curve and the dynamic boundary error curve and between the static detection difference value curve and the test error value.

The invention discloses an automatic test method for a co-driver screen of an intelligent cabin, and the main design conception of the method is that the screen ID number of the co-driver screen is added in an ADB instruction, analog simulation test operations such as clicking and sliding of the co-driver screen are realized, whether the response on the interface of the co-driver screen is correct or not is judged in combination with a screenshot recognition mode, and the test accuracy of the co-driver screen is improved. A loop test mechanism is formed by links such as ID acquisition, ID addition and simulation operation screenshot, so that reliable detection is realized for copilot screen functions, especially accidental problems; furthermore, the process related instruction can be packaged into an executable file, so that efficient, convenient and fast automatic testing of the co-driver screen interface is realized. According to the method, the functions of the co-driver screen in the vehicle are tested in a lightweight automatic test mode, the cost investment of test equipment is greatly reduced, the test efficiency of the co-driver screen is improved, and the stability of software is effectively improved.

The utility model relates to the technical field of getter testing, in particular to an automatic cycle testing system for a getter pump. The system comprises a vacuum chamber, a vacuumizing system, a baking temperature control system, an activation power supply, a cooling device and an air supply system, wherein valves, instruments, a heating power supply, a cooling power supply and an activation power supply on a connecting pipeline are connected with a data acquisition system and an automatic control system; besides, the vacuum chamber is divided into a Pm chamber and a Pg chamber by an orifice plate, the Pm chamber is connected with an air supply system, a to-be-detected getter pump is arranged in the Pg chamber, a valve switch in the system is controlled through a data acquisition system and an automatic control system, and circulation of heating activation, low-pressure air chamber pressure adjustment, cooling and air suction test is automatically completed. Meanwhile, the pressure of the Pm chamber and the pressure of the Pg chamber are recorded, and the inspiration rate, the inspiration capacity and corresponding curves are automatically calculated. According to the detection system and method, automatic control of multi-cycle inspiration testing can be realized, and the testing efficiency and the testing accuracy are improved.

The utility model provides an anti-fatigue testing device for a diamond compact, which relates to the technical field of diamond testing and comprises a bottom plate and a motor, the top end of the bottom plate is fixedly connected with a supporting assembly, the supporting assembly comprises a supporting column, the bottom end of the supporting column is fixedly connected onto the bottom plate, and the top end of the bottom plate is fixedly connected with a limiting frame. A supporting plate is fixedly connected to the side, away from the limiting frame, of the top end of the bottom plate, a circulation testing assembly is fixedly connected to the top end of the supporting assembly, and a pushing assembly is fixedly connected to the outer side of the bottom plate, so that the motor drives the driving chain wheel to rotate, automatic circulation testing of the testing balls is achieved, and it is ensured that the testing balls stably slide on a specified route; inconsistency of test results caused by factors such as skill level and experience of operators is avoided, and the problem of inaccurate impact times caused by continuous bounce of the test ball is avoided by ensuring that the test ball is in stable contact with the surface of the diamond compact.

This invention discloses a method for testing the anti-coking performance of diesel engine oil in turbochargers. The main design concept of this invention lies in designing a full-process test based on engine operation, including high smoke conditions, low temperature and low load conditions, high temperature and high load conditions, and multiple rounds of cyclic testing to simulate the high and low temperature fluctuations of engine oil. This achieves a comprehensive assessment of the impact of engine oil performance changes on turbocharger coking. Furthermore, engine oil sampling is performed at predetermined stages to monitor relevant physicochemical properties. Further, the turbocharger is disassembled and evaluated after the test procedure, enabling an accurate evaluation of the engine oil's anti-coking performance. This facilitates the matching development of engine oils during engine development and avoids problems such as turbocharger damage and reduced power caused by using unsuitable engine oil. This invention comprehensively covers soot dispersion, high-temperature shear resistance, and temperature oscillation, providing significant guidance for the comprehensive evaluation of engine oil's anti-coking performance.

The invention relates to the technical field of transmission testing, in particular to a commercial vehicle AMT (automated mechanical transmission) brake performance and service life testing method, which comprises the following steps of: 1, mounting an AMT gearbox on a rack meeting experimental conditions, and connecting the AMT gearbox with a motor through a clutch; 2, building a test model through MATLAB Simulink, generating a C code, integrating underlying software by using HighTec, generating an executable file, and flashing the executable file into a TCU (Transmission Control Unit); 3, the upper computer interacts with the TCU, and data representing the test process and result are sent through a CAN bus and displayed on an interface of the upper computer. According to the method, MATLAB Simulink is used for building a test model and generating a C code, an executable file is produced after integration, and automatic testing is achieved through CAN signal and UDS interaction; the TCU controls the electromagnetic valve through the wiring harness, so that the execution mechanism is controlled through compressed air to achieve separation and combination of the clutch and braking of the TB, the TCU autonomously executes instructions and performs cyclic testing, manual intervention is not needed, the single-time testing time is remarkably shortened, and then the testing efficiency is improved.

The utility model discloses a self-adaptive force stabilizing device for characterizing a mechanoluminescence cycle process, and belongs to the technical field of material testing. According to the device, collaborative operation is achieved through a reciprocating testing mechanism and a force loading mechanism which are in linkage design; the reciprocating testing mechanism drives a lead screw transmission assembly through a servo motor to drive a single-axis moving platform, a pressure digital display and a material to achieve reciprocating friction in the y-axis direction; the force loading mechanism pulls a sliding platform to slide on a sliding rail through a spring, a round-bottom quartz tube is arranged at the end of the force loading mechanism and is in point contact with a sample of a pressure digital display accessory, and when the sample is slightly abraded to cause position change, the spring dynamically compensates pressure loss to ensure that force loading in the x-axis direction is constant. An optical fiber is integrated in the round-bottom quartz tube to synchronously collect mechanoluminescence signals. The device solves the problem of force attenuation in the existing cycle test, and is beneficial to systematic research on the cycle characteristics of the mechanoluminescent material.

The invention relates to the technical field of structural design optimization, in particular to a structural parameter optimization design method and system based on sheet metal parts. The method comprises the following steps of calculating a normal included angle field by extracting a surface patch normal and a surface center coordinate of a CAD model, identifying a rib position transition area, and performing arc length calculation, curvature point analysis, step jump judgment and transition curve fitting based on a rib rotation angle coefficient. And the fatigue performance and the structural design optimization effect of the fitted curve are verified through a load cycle test. According to the method, the transition rib position area of the sheet metal part is accurately recognized through the normal included angle field, fine parameterization of the curve form is achieved in combination with the rib rotation angle coefficient, then step jump analysis and fitting are carried out, the stress streamline and structure transition design is optimized, the improvement effect of the method on the fatigue performance is verified through a load cycle test, and therefore the damage risk is effectively reduced, and the fatigue performance of the sheet metal part is improved. And the service life and reliability of the sheet metal part under the repeated load are improved.

The invention discloses a Solana chain program transaction sequence dependence defect detection method based on fuzzy testing and symbolic execution, and the method takes an ELF executable file of a Solana chain program as an input, and takes a detected transaction sequence dependence defect report as an output; in order to detect the transaction sequence dependency defect in the program on the Solana chain, the method is based on the thought of fuzzy testing and symbolic execution, the program on the input Solana chain is tested and analyzed, an initial block chain simulation state and a seed transaction are generated from an executable file of the program, and then loop testing is carried out. And when the test is finished, outputting detailed reports of all defects found in the process. The method provided by the invention has the advantages of effectiveness and high efficiency, and can more effectively discover the transaction sequence dependency defect in the Solana chain program.

Disclosed are a method and system for verifying a low-frequency oscillation damping control effect of a governor power system stabilizer (GPSS), relating to the technical field of power systems. The method includes: selecting a wiring working condition for a fault-free disconnection test, and constructing a unit test working condition; performing the fault-free disconnection test on an outgoing line of a power plant, and collecting an electromagnetic power fluctuation recording curve; and comparing low-frequency oscillation damping effects under different GPSS settings, evaluating the effects, and performing a cyclic test. A success rate of the test is increased, safety of the test is improved, and the overall stability and anti-oscillation capacity of the system are improved in the disclosure.

The utility model discloses an AC power cycle test circuit and device, and relates to the technical field of electronics. The circuit comprises an IGBT and a to-be-tested device, one end of the to-be-tested device is electrically connected with an emitter of the IGBT, and a collector of the IGBT and the other end of the to-be-tested device are electrically connected with two ends of a voltage source respectively; wherein the to-be-tested device comprises three to-be-tested units which are connected in parallel, and each to-be-tested unit comprises two switch tubes which are connected in series; the collector and the emitter of the switch tube of the upper bridge arm of one to-be-measured unit are connected with the two ends of the measuring current source; the series connection end of the switch tube of the upper bridge arm and the switch tube of the lower bridge arm of each to-be-tested unit is electrically connected with a load, and the other end of the load is grounded. The aging of the device can be monitored on line, so that the test result for evaluating the to-be-tested device is more accurate.

An exemplary testing system and method are disclosed for mechanical testing and evaluation of geogrids and other geosynthetic materials to improve load distribution, durability, and performance. The exemplary testing apparatus and method are capable of uniaxial, biaxial, and triaxial testing on different geogrids and other geosynthetic building material, including all types of commercially available geogrids (uniaxial, biaxial, triaxial), geotextiles (woven, non-woven), as well as new-generation geogrids (including spider-web inspired that have hexagonal and other multi-scaled structures). The test apparatus can perform static (monotonic) application of load as well as cyclic tests on geosynthetic materials.