19 results about "Cyclic test" patented technology

The present application relates to the technical field of plate performance testing, and particularly relates to a kind of plate edge durability test method;It comprises the following steps: cutting plate sample into standard size test piece;Using thermal mechanical analyzer respectively test the linear expansion coefficient of test piece edge material and base material;The test piece after processing is placed in environmental test chamber and is subjected to cyclic test;Test piece is fixed on load testing device, and constant load is applied along the direction perpendicular to the edge interface of plate plane;Using flatness tester to measure the overall warping of test piece, compare with the warping data before testing, calculate the warping change, evaluate the actual effect of plate balanced laminating process on preventing warping after edge sealing;Using weighted scoring method to calculate the comprehensive score of edge durability;Realize that the long-term durability of plate edge sealing under complex working conditions can be comprehensively and accurately evaluated, and provide scientific and comprehensive technical support for edge sealing process optimization, material selection and structure design.

A cryogenic testing system, method, equipment, and medium for aircraft fuel servo valves are disclosed, relating to the field of testing systems. The aircraft fuel servo valve cryogenic testing system maintains the medium at a preset ambient temperature by setting up an ambient temperature fuel tank. In conjunction with a high-pressure pump group and a cryogenic heat exchanger arranged sequentially along the fuel supply pipeline, only the medium flowing to the test station is pressurized and deeply cooled online. This eliminates the need to cool all the medium in the ambient temperature fuel tank, significantly reducing cooling energy consumption and cooling time. Simultaneously, a temperature return control loop on the return pipeline can raise the temperature of the cryogenic, high-pressure medium flowing out after the test to ambient temperature before returning it to the ambient temperature fuel tank, preventing the backflow of the cryogenic medium from disturbing the temperature field within the tank. This effectively solves the problems of large temperature fluctuations, low testing accuracy, and poor continuous operation efficiency in traditional overall cryogenic cyclic testing. It can stably maintain the extreme low-temperature conditions required for testing for extended periods, improving the accuracy and continuous operational stability of aircraft fuel servo valve cryogenic testing.

This invention relates to the field of building material testing technology, specifically a method for testing the mechanical properties of corn stalk laminated timber. The method includes: planning a grid of testing points on the laminated timber; measuring the elastic modulus and local compressive strength of each testing point in both the longitudinal and transverse directions to form a measurement distribution matrix; based on the differences in values ​​of the measurement distribution matrix in each direction, performing multi-directional feature calibration on the laminated timber to delineate preliminarily identified performance defect areas; based on the performance defect areas under multi-cycle fatigue loading, using the residual elastic modulus under multi-directional cyclic testing, performing residual performance calibration to establish performance distribution weights for each testing point; based on the performance distribution weights configured for the testing points, performing spatial autocorrelation analysis to determine the spatial correlation data of performance defects; and interpreting the spatial correlation data in relation to the distribution of testing points to generate mechanical testing results. This method improves the accuracy and efficiency of laminated timber testing.

This application relates to an aging test system for a drone power sleeve, comprising: a drone fuselage with a mounting position for installing the power sleeve; a damping rod including a cylinder and a piston rod; the piston rod being connected to the drone fuselage; a universal ball joint assembly including a universal ball joint rod and a universal ball socket, the universal ball joint rod and the universal ball socket being movably connected to form a spherical pair; the universal ball joint rod being connected to the cylinder; a round steel plate connected to the universal ball socket; a spring shock absorber connected to the round steel plate; and a fixed base connected to the spring shock absorber. This invention can reproduce outdoor flight conditions as closely as possible, improving the accuracy of aging test results. It can also achieve uninterrupted cyclic testing indoors, improving testing efficiency, reducing labor and time costs, and avoiding various risks associated with outdoor flight operations, such as drone crashes, airspace violations, and weather conditions.

This invention relates to the field of testing technology for large ship propulsion systems, specifically to a test method and system for assessing the wear reliability of large water-lubricated bearings. This invention ensures the similarity in lubrication and cooling performance among three pairs of friction pairs tested—material test blocks, scaled-down samples, and full-scale prototypes—in terms of test objects. When comparing and analyzing wear, the influence of relative sliding speed on wear is simplified by using a linear velocity cyclic test design with the same time span, thus simplifying the wear rate model of the water-lubricated bearing. Compared to solely relying on the durability cyclic test data of the full-scale prototype, the addition of scaled-down sample tests reduces the randomness of test data, and the use of the maximum average wear value as input to determine the wear model of the water-lubricated bearing improves the engineering reliability of the assessment method. This invention can shorten the testing and assessment cycle for the wear reliability of large water-lubricated bearings, save testing costs, and provide highly accurate assessment results.

The application provides a semiconductor power cycle test system and a test method, and relates to the technical field of semiconductor module testing.The system comprises a control terminal and a plurality of independent detachable test modules.The control terminal communicates with each test module to transmit instructions and data.Each test module comprises a load module for controlling load parameters in the power cycle test process,a temperature control module for controlling temperature parameters in the power cycle test process,and a sampling module for sampling the test object in the power cycle test process to obtain state parameters.The control terminal sends instructions to the load module and the temperature control module to control the load parameters and the temperature parameters of each test module.The sampling module of each test module collects state parameters in real time and sends them to the control terminal.The control terminal processes and displays the state parameters after receiving them,thus solving the problem of poor adaptability of the existing semiconductor power cycle test system with fixed assembly.

This invention discloses a method for testing the thermophysical properties of a supercooled unstable hydrated salt phase change material. The method includes: performing a first DSC cycle test on the supercooled unstable hydrated salt phase change material: heating from an initial temperature to a first temperature, then cooling to a second temperature; performing at least one pretreatment on the material obtained from the first DSC cycle test: heating from a second temperature to a third temperature, then cooling to a second temperature; and performing a DSC cycle test on the pretreated material. This invention achieves separation of exothermic and endothermic peaks by performing at least one pretreatment—heating and then cooling again within a range below the material's melting temperature—after initial cooling, thus avoiding interference between the exothermic peak and the endothermic peak.

The application discloses a low-temperature circulation testing device and method, which can quickly provide a low-temperature medium temperature. The low-temperature circulation testing device comprises a main circulation pipeline, a secondary circulation pipeline, a refrigerating unit, a high-position liquid tank, an interval oil tank, a pump, a pressure / temperature sensor, an adjusting valve and the like. When the low-temperature circulation testing device works, the target temperature, pressure and flow required by a test product are set on a testing software, and then the testing system compares real-time data collected by the temperature, pressure and flow sensors with the set parameters, adjusts the working stroke of each hydraulic element through a lower computer, so that the real-time data in the testing meet the set parameters, and then the functional performance indexes of the test product under the low-temperature medium state are detected. The high-position liquid tank and the interval liquid tank are adopted in the application, heat transfer between the low-temperature medium and the outside is reduced, condensed water in the air is prevented from entering the low-temperature medium, and the cooling rate and service life of the testing medium are improved.

The application discloses a kind of bidirectional counterforce type pushing mechanism friction performance detection device and method, device includes counterforce frame, pushing mechanism, loading cylinder group and detection assembly, sliding friction pair is equipped between pushing mechanism and structure beam, and detection assembly contains multiple high-precision sensors and detection equipment.Method based on the device, by changing different friction-reducing parts, gradient vertical load and horizontal traction are applied, relevant data are collected to calculate friction coefficient, evaluate motion smoothness, after screening suitable friction-reducing parts, cycle test is carried out, to evaluate friction durability with the maximum cycle number of contact surface without obvious defects.The application can accurately simulate actual working conditions, improve detection reliability, avoid construction test risk, provide support for pushing mechanism design optimization and fault prediction, and has economic benefit and social benefit.

This invention relates to the field of industrial visual inspection technology, specifically a visual detection method for thermal shock cracks in industrial robot protective covers. The method includes: acquiring reference and detection images from multiple fixed perspectives using a high-resolution industrial camera before and after the thermal shock cyclic test of the protective cover; achieving pixel-level alignment through grayscale normalization and geometric registration; dividing the image sequence into blocks for differential analysis; calculating the cumulative difference value of local intensity to mark potential abnormal regions; extracting corresponding pixel blocks and calculating a histogram of texture direction distribution; eliminating pseudo-abnormal regions with low texture distribution consistency through similarity measurement to obtain a set of candidate crack regions; and then verifying the edge continuity of suspected crack regions. This method can effectively reduce interference from ambient light, thermal deformation, etc., filter out non-crack-like false anomalies, and improve the positioning accuracy and recognition accuracy of thermal shock crack detection in protective covers.

The utility model relates to the technical field of test tooling, especially to a solar energy deep well pump motor water circulation test tooling, its convenient simulation different depth's water pressure environment, improve deep well pump motor under different water pressure water circulation delivery test convenience, reduce the limitation of test, improve personnel operation convenience, including base and test box, test box installs at the base top, is provided with the opening at test box top, still includes conveying device, pressure increasing device, sealing cover, first cylinder and support, sealing cover rotatory mounting is in test box outside wall, the fixed end of multiple group first cylinder all install in test box inboard wall, the mobile end of multiple group first cylinder all are connected with support bottom, be provided with conveying device on the base, and conveying device is used for conveying clear water in test box, and pressure increasing device installs on the base, and pressure increasing device is used for filling pressure in test box.

The application discloses a kind of hydraulic pipe pressure washing integrated control system and device, it is related to hydraulic pipeline detection technical field;The system includes power liquid supply module, fluid-structure coupling sensing module, circulation test loop module and main control processing module, main control processing module controls output pulsatile fluid to be tested hydraulic pipe and carries out cleaning, using cross-correlation operation processing collected flow and pressure sequence to extract phase lag, and then solve pipeline relaxation time constant;By monitoring transient flow resistance value and its change gradient to automatically determine that cleaning is completed;In the pressure maintaining test stage, system blocks oil return passage, according to relaxation time constant to construct pressure natural attenuation reference curve reflecting material creep characteristic, and by calculating the residual of real-time pressure and reference curve to distinguish material deformation and fluid leakage.The application not only realizes the self-adaptive control of cleaning process, but also eliminates the false judgment influence of pipeline viscoelasticity on sealing detection.

This invention discloses a testing method and apparatus for IGBT modules. The IGBT module is connected to a DC bus and an inductor box. A temperature outer loop generates a reference current value based on the deviation between the target test junction temperature and the actual junction temperature. An inner current loop adjusts the PWM duty cycle based on the deviation between the actual output current and the reference current value, thereby controlling the IGBT module to apply a converted DC voltage to the inductor box. This makes the actual junction temperature of the IGBT module approach the target test junction temperature. Based on the actual junction temperature data and actual output current data during the testing process, the IGBT module test results are output to achieve power cycle testing of the IGBT. The dual closed-loop control achieves accurate simulation of the IGBT module junction temperature, and the connection between the IGBT module and the inductor box reproduces the thermal stress of the IGBT module under actual operating conditions, thus more accurately determining the power cycle test results of the IGBT module under actual operating conditions.

The application provides a power cycle test device, and relates to the technical field of semiconductor module testing.The power cycle test device comprises a base, a clamp assembly arranged on the base, a first conductive sheet and a second conductive sheet, the clamp assembly comprises at least one clamp unit, the clamp unit comprises a clamp, a third conductive sheet and a fourth conductive sheet arranged on the clamp, the clamp is used for fixing a module to be tested, and the third conductive sheet and the fourth conductive sheet are electrically connected with the module to be tested respectively; each clamp unit has a corresponding first conductive sheet and a corresponding second conductive sheet, one of the first conductive sheet and the second conductive sheet is electrically connected with the third conductive sheet, and the other is electrically connected with the fourth conductive sheet; the first conductive sheet is further electrically connected with a positive electrode of an external power supply; and the second conductive sheet is further electrically connected with a negative electrode of the external power supply. The power cycle test device can improve the test efficiency of workers and reduce safety hazards.

Cyclic testing machine (100) for a specimen (11) of biological structures under cell culture conditions, the machine (100) comprising: - a base (1), - a crosspiece (2) hinged at one of its first end (2') by means of a cylindrical hinge (6), in turn integral with a first end (1') of the base (1), so as to operate a cyclic rotation motion around the cylindrical hinge (6), - a weight-holding basket (8) removably fixed on the crosspiece (2), - an anchoring cylinder (14) fixed to a second end (2') of the crosspiece (2), - a stepper motor (10) supported by a support (3), in turn integral with a second end (1'') of the base (1), - a pulley (15) keyed to one end of the stepper motor (10), said machine (100) being characterised in that - an inextensible cable (17) fixed to the anchoring cylinder (14) is wound in a groove (18) of the pulley (15), which rotates by defined angles by means of the stepper motor (10) and allows the movement of the crosspiece (2) itself by means of the hinge (6); - a pressing plate (12) integral with the crosspiece (2) configured to apply a compressive load to the specimen (11).

The application provides a vehicle gear shifting test method and system based on timing data of an on-board diagnostic interface. The method comprises signal acquisition, data processing, steady speed ratio interval establishment, candidate gear shifting interval identification, gear shifting determination, test compliance determination and test report generation. The system comprises modules corresponding to each step. The vehicle gear shifting test method based on timing data of the on-board diagnostic interface is used to realize automatic gear shifting reading and test analysis of a vehicle under test in a cycle test. By introducing a speed ratio representation parameter and a steady speed ratio interval, gear shifting identification is established on the basis of power transmission state change, so that the stability of gear related signal identification is improved through an intermediate representation layer. The test method and system can adapt to different test objects and automatically generate a test report.

The utility model relates to a cold water machine circulation testing arrangement, including first water tank, second water tank and third water tank, the top fixed mounting of first water tank has water pump, and the top of first water tank's front end face is provided with temperature sensor, and the rear end of first water tank is fixedly installed in second water tank, and the front end face of second water tank has the gap with the rear end face of first water tank, and the top of second water tank's rear end face is provided with temperature sensor, and the right side of first water tank is fixedly installed in third water tank, and the right end face of second water tank and first water tank has the gap with the left end face of third water tank, and the top of third water tank is fixedly installed with heater, and the top of third water tank's front end face is provided with temperature sensor, can high -efficient and accurate control the temperature of cooling medium through the setting of heater and temperature sensor, has improved the convenience and security of operation.

This application relates to a vehicle charging and discharging test method and electronic device, applied in the field of equipment testing technology. The method includes: issuing a first test command to the vehicle, the first test command indicating the start of a charging and discharging test on the vehicle, the first test command including cyclic test parameters; cyclically executing the following test process: acquiring real-time vehicle charging and discharging status information, determining the current test node of the vehicle based on the charging and discharging status information; when the current test node indicates that the vehicle has completed charging or discharging, generating a target charging and discharging strategy for the next test node based at least on the current test node, cyclic test parameters, and charging and discharging status information, and sending a second test command to the vehicle, the second test command including the target charging and discharging strategy, so that the vehicle performs the charging and discharging test according to the instructions of the second test command; until the result of the vehicle's charging and discharging test meets the test termination condition indicated by the cyclic test parameters.