1314 results about "Life test" patented technology

The invention relates to a method for predicting the life of a solid tantalum electrolytic capacitor, which comprises the following steps of: 1, collecting current degradation data; 2, determining a degradation track model and a degradation accelerating model; 3, extrapolating the degradation track model to obtain the pseudo-failure life of each sample; 4, performing hypothesis test of pseudo-life distribution and the estimation of unknown parameters; 5, determining the relation of population parameters of the pseudo-life distribution and a stress level; 6 estimating the population parameters of the life distribution of a tantalum capacitor under the normal stress by extrapolating; and 7, determining the average life and reliability curve of the tantalum capacitor. The method has novel concept and simple programs and does not need life tests, the test time can be shorted, the test cost can be saved, and the problem of disharmony between the prediction of the conventional life and engineering is solved, so the method has wide application prospect in the technical field of life prediction.

The invention discloses an antifriction bearing multi-functional fatigue life test bed which comprises a drive part, a test part, a loading part, a control part and a data acquisition part, wherein the drive part comprises an electromotor, a polywedge belt wheel, a polywedge belt and a special polywedge belt wheel; the test part comprises a test main shaft, a supporting bearing, a supporting bearing pedestal, a test bearing, a test bearing box, a test bearing box bracket, a test bearing box bracket fixing truss, a bearing thrust ring and an oil seal ring; the loading part comprises a pull rod, an armature, an electromagnet array, an electromagnet array base, a nut and a plurality of weights; the control part comprises a computer, a current controller and a programmable power supply; and the data acquisition part comprises a vibration sensor, a temperature sensor, a pressure sensor and a vibration, temperature and pressure data acquisition system. The antifriction bearing multi-functional fatigue life test bed can be used for carrying out a fatigue life test on single or multiple antifriction bearings and can apply different loading methods to each antifriction bearing respectively.

The invention discloses a method for testing the accelerated life of an electronic product based on a life-stress model. The method comprises the following steps of: 1, defining the life characteristics of a sample; 2, defining failure criteria; 3, performing accelerated life test of the maximum stress combination; 4, performing accelerated life test of the other combinations, namely performing the test of other four different groups of stress combinations except for the maximum stress combination; 5, processing failure data, namely fitting a weibull distribution model of total life of all groups of test samples by a weibull distribution fitting analysis method and solving the corresponding life characteristic parameter; 6, estimating an accelerator model parameter; 7, determining humidity stress under the using condition; and 8, extrapolating sample failure distribution under the using condition. The method can obviously shorten the time of the accelerated life test of the electronic product, and improve the accuracy of a test result. The method has good practical value and wide application prospect in the technical field of the accelerated life test.

The invention relates to a life tester for an alternating-current contactor and a control method thereof. The life tester consists of a test control cabinet, a specimen cabinet, a 1/6Ue power supply cabinet and a load cabinet, wherein the test control cabinet comprises an industrial personal computer, a driving circuit and a contact state detection circuit; the specimen cabinet comprises a first accompanied specimen, a contactor specimen and a first breaker; the 1/6Ue power supply cabinet comprises a second accompanied specimen and a second breaker; and the load cabinet comprises a load circuit. The life tester is controlled by the industrial personal computer, so a life test of the alternating-current contactor can be completed automatically and accurately, and the automation level of the life test is improved; and four electrical life tests of a switch-on test, a break-off test, a dead load test and a variable load test of the alternating-current contactor can be performed, and a mechanical life test of the alternating-current contactor also can be performed. The life tester has an integral data protection function, namely test data is not lost in case of unexpected outage, the collected test data is not damaged after the power supply restores, and the test data is saved perpetually.

The invention discloses a rapid prediction method for the cycle life of a lithium ion battery. The method comprises the following steps of carrying out the charge and discharge performance test on a to-be-evaluated battery at different numbers of cycles, and recording a relation curve among the voltage, the capacity and the time of the battery during the charging process at different numbers of cycles; calculating the change delta C of the capacity of the battery when the voltage of the battery changes from 3.95V to 4.15V during the charging process at different numbers of cycles according tothe relation curve; according to the change delta C of the capacity and the test data on the numbers of cycles, conducting the fitting calculation and predicting the cycle life of the battery. Compared with the conventional cycle life test method, the above method is simple and feasible. The test period of the cycle life is greatly shortened. Compared with the pure theory calculation and the empirical model prediction, the method is better in universality. The actual test results of the method are better in consistency. The research and development speed of products is accelerated. The methodcan be widely applied to the field of new energy and the like.

The invention discloses a lead storage battery accelerated life detection method. According to the method, a lead storage battery is subjected to high-temperature environmental detection, and a pulse is added in the detection process, so that a detected result is approximate to a result of a 100% DOD life test at the normal temperature, and the cycle life of the lead-acid storage battery can be tested and estimated more quickly; the whole detection period is about 2-4 months, the detection time is remarkably shortened, data are true, the performance of the battery can be evaluated, and the speed of researching and developing new technologies and new products by an enterprise or a research and development unit can be remarkably increased.

The invention discloses a method for evaluating long life of a component. The method comprises the following steps of: analyzing characteristics, an application platform and an application environment of the component; initially determining a stress level and sensitive parameters of a test; determining an application sequence of stress factors, responding to an analytical method for the sensitive parameters, and determining test equipment; performing an official test, namely recording sensitive parameter values of a component accelerated life test at certain time intervals to display changes of the sensitive parameters of the component accelerated life test along with time; performing graphical analysis by using graphic software, and selecting the best accelerator model and lifetime forecasting model; and verifying whether the models are valid, if so, evaluating the long life of the component, otherwise, redetermining the parameters. The method has the advantages of short test period, low testing expenses, general applicability, scientificity, no need of a preset model, suitability for small increments and capability of evaluating the long life of components adopting new technology and having long life.

The invention discloses working electrolyte of a 650V-700V extra-high-voltage aluminum electrolytic capacitor. The working electrolyte of the 650V-700V extra-high-voltage aluminum electrolytic capacitor comprises, by weight, 45-65% of primary solvents, 5-20.5% of secondary solvents, 10-20% of solutes, 8-25% of spark voltage improvers, 5-10% of stabilizers, 0.2-3% of hydrogen absorbents, and 2-5% of other additives. The invention further discloses a preparation method of the working electrolyte of the 650V-700V extra-high-voltage aluminum electrolytic capacitor and the 650V-700V extra-high-voltage aluminum electrolytic capacitor. According to the 650V-700V extra-high-voltage aluminum electrolytic capacitor, the working electrolyte and the preparation method of the working electrolyte, the spark voltage improvers and the stabilizers within the reasonable ranges are used, the high-voltage resistance and high-temperature resistance of the electrolyte are improved, and meanwhile the working electrolyte has low gas production performance. When the aluminum electrolytic capacitor with the electrolyte is subjected to a ripple current life test at 85 DEG C for 2000 hours, the aluminum electrolytic capacitor can resist the voltage of 650-700V and even higher voltage, and a breakdown phenomenon caused by unstable spark voltage of the electrolyte is avoided.

The invention provides a method and a device for evaluating the life of a product. The method comprises the following steps of: determining key devices of a complete machine equipment product; performing an accelerated life test on each key device, and obtaining the corresponding life characteristic according to accelerated life test data; and evaluating the life of the complete machine equipment product according to the life characteristic of each key device. By the method and the device, time for evaluating the life of the product can be shortened, and the cost of evaluating the life of the product can be reduced.

A metal soft tube flexural oscillations tester for conducting life test is provided, which comprises a stander, a control cabinet, an electric control unit and a displaying unit. The technical points are that: a transmission oil cylinder, a rotating axle and a transmission arm are arranged in the stander, which are connected with an arm swinging link gear to compose the actuating unit of the equipment. and the hydraulic pressure machine set drive motor power structure drives the equipment to movement swinging arm; the two ends of the metal soft tube are installed on a fixing pressing base and a dynamic displacement compensation mechanism, and the metal soft tube movement trail is adjusted by an arc limiting structure; one end of the metal soft tube is connected fixedly with the arc limiting structure to realize bending and double-direction swinging function. Through an electric control unit, a starting dynamo, the alternate invariable displacement structure composed of an eccenter, a connecting bar, a linear guide and a movement end connected with base is driven by a reducer driven by electric engine, which makes the metal soft tube fixed on the connecting base of the moving end realize the curvature movement of invariable displacement.

The invention provides a friction and wear testing machine of guide rail of machine tool and relates to a friction and wear testing device of guide rail pair, belonging to the technological field of tribology. The testing device comprises a testing system and a measuring system. An oil blocking plate in the testing system is provided with an upper sample platform, an oil blocking plate, a lower sample platform, a first sensor mounting bracket and a second sensor mounting bracket; the first sensor mounting bracket and the second sensor mounting bracket are respectively arranged on a base; a flat V guide rail is arranged between the lower sample platform and the base; an upper sample fixture is arranged between the first sensor mounting bracket and the second sensor mounting bracket; the first sensor mounting bracket and the second sensor mounting bracket are connected with a cover plate respectively by a support rod. The novel friction and wear testing machine of the machine tool can simulate the actual working condition, and directly adopt the guide rail as the sample. Moreover, the testing machine can not only be used for rapidly assessing the material of the guide rail pair and the lubricating medium, but also can be used for the accelerated life test of the straight guide rail pair and the rolling guide rail pair.

The invention relates to an accelerated life test method of an aircraft brake system. The environment conditions of applying temperature stress, vibration stress and the like in a combined way are adopted, the operating conditions are added and the operating frequency of the whole system are increased during the test process, so that the hidden fault dangers of the brake system are stimulated, and the test time is shortened. The method is circularly carried out according to the test profile during the test process until the required reliability index is reached. The power-on operating conditions, the brake applying pressure operating conditions and the rotating speed change conditions in use are converted into the test time according to the applied operating frequency, and the operating frequency adopted in the test is greater than the actual operating frequency in use. The reached reliability index is assessed according to the method in GJB1407 and recommended degree of confidence after the test is finished, and the degree of confidence for assessing the reliability index is 90%; and the empirical coefficient of life assessment is 1.5. The purpose of performing the accelerated life test on the brake system is realized by verifying whether the brake system has hidden fault dangers under various operating states.

The invention relates to the field of electrical equipment detection, in particular to a full-performance detecting system of a magnetic latching relay and a detecting method of the full-performance detecting system of the magnetic latching relay. The detecting system comprises a main control panel, an auxiliary control panel and a resistive load box, wherein the auxiliary control panel is communicated with the main control panel through a network port, the auxiliary control panel controls the resistive load box to work by controlling an air switch, and the main control panel is connected with the magnetic latching relay. An ongoing full-performance test of the magnetic latching relay comprises an initial operation voltage, a returned value voltage test, an operation time test, a four probe method and high current method coil resistance test, a contact temperature-rise test, a mechanical life test, an electrical endurance test and an overload test. The full-performance detecting system is simple in wiring, capable of automatically finishing an electrical performance test, a safety performance test and a service life test without manual intervention, comprehensive in test items, and simple in test process.

The invention relates to a turbine rotor blade accelerated life test load design method taking regard of flight damage. The method includes: 1) conducting frequency mixing treatment and rain flow counting on aeroengine flight missions and training subjects to acquire the frequency and time of each rotation speed cycle in actual flight, thus obtaining the load basic data of an engine within certain flight hours; 2) acquiring the temperature field and stress strain distribution of the blade under all states by finite element method, analyzing the blade static strength and endurance, and determining a lifetime testing part of the blade; 3) calculating the fatigue damage and creep damage of the blade testing part under a true flight load to acquire a ratio of creep damage and fatigue damage during rise and fall of a flight; and 4) designing a accelerated life test load spectrum of a full-size blade, and determining a conversion coefficient of the blade test load spectrum relative to out-field flight. The method provided by the invention can be used for acquiring the technical life of the blade and studying the remaining life of the blade, and saves time and economic cost for the fatigue-creep lifetime test of the blade.

The invention relates to a method for evaluating the life of space hydrogen-nickel storage batteries, and belongs to the technical field of hydrogen-nickel storage batteries. The method for evaluating the life of the space hydrogen-nickel storage batteries is characterized by comprising the following steps of: selecting similar hydrogen-nickel storage batteries, performing a charge-discharge cycle life test at the ambient temperature of between -5 and +5 DEG C, detecting the discharge capacity of the hydrogen-nickel storage batteries in each charge-discharge cycle, calculating the discharge depth of the hydrogen-nickel storage batteries, fitting to obtain a hydrogen-nickel storage battery life prediction mathematical model, and predicting and evaluating the life of the hydrogen-nickel storage batteries by using the mathematical model. The method has the advantages that: the method is simple, is convenient to operate, and is high-efficiency and quick, data is accurate, the life is easy to detect, and the like, the cycle life of the hydrogen-nickel storage batteries under the design discharge depth can be quickly predicted, design efficiency is improved, and the research and development of track hydrogen-nickel storage batteries are facilitated.

This invention relates to one motor aid rotation system life test bench, which comprises tested EPS sample, signal generation module, display meter module and load device, wherein, the EPS sample comprises rotation disc, rotation part, rotation sensor and motor bus and controller; controller is to send the voltage signal into motor bus and to sensor with work power and to send the fault signal into display meter module; motor bus is connected with mechanic system through acceleration device with output end connected with load device; signal generation module is connected to controller, display device module.

The invention discloses a predicting method of large-size NEPE propellant loading storage life, which includes following steps: (1) performing constant-stress load single-temperature acceleration test, which includes operations of making an NEPE propellant acceleration aging test sample under constant-stress load and performing a single-temperature-stress level temperature acceleration life test; (2) researching the performance change law during an NEPE propellant loading aging process; (3) determining a failure model of the NEPE propellant loading; and (4) carrying out acceleration life tests at different temperatures and under different pressures to predict the large-size NEPE propellant loading storage life. In the method, by means of loading pressure to simulate the self weight on a large-size NEPE propellant during storage, the performance change law of the NEPE propellant under a temperature-pressure double-stress effect. In addition, with tensile strength as a failure parameter, the method of evaluating the NEPE propellant loading storage life is disclosed.

The invention discloses a preparation method of a multiple quantum well structure for a photoelectric device. The multiple quantum well structure comprises n quantum well structures which are overlapped in sequence, and each quantum well structure is formed by sequential growth of potential well layers and potential barriers, wherein the growth of each potential well layer comprises the following steps: 1, first growing an NixGa1-xN potential well layer, wherein x is more than 0.1 and less than 0.45; 2, growing a GaN insert layer; and 3, growing the InxGa1-xN potential well layer, wherein x is more than 0.1 and less than 0.45. When the potential well layer grows, one or more than two of GaN insert layers with energy band width different from that of the InxGa1-xN potential well layer and an In treatment layer grow alternately. On the one hand, the In treatment layer can stabilize the structure of the InxGa1-xN, ensures the stability of quantum well components, and controls the stability and consistency of wavelength; on the other hand, the GaN insert layer disturbs the energy band structure of a quantum well region to improve the composite rate of electron hole pairs, so that the internal quantum efficiency of device illumination is improved, and as the brightness is improved, the life test performance of the device can be improved.

The invention provides a MOSFET static parameter test method of an MOSFET reliability test analysis system, belonging to the measurement and analysis technology field. In the prior art, a method of carrying out an acceleration degeneration life test under a simulated severe environment to detect MOSFET reliability in real time continuously is not employed. The MOSFET reliability test analysis system comprises an MOSFET degeneration experiment environment simulation case, an MOSFET static parameter tester, a lower computer, a host computer and a PC machine. The static parameter tester measures threshold voltage, transconductance and channel resistance of an MOSFET in the degeneration experiment environment simulation case. The method comprises the following steps: the MOSFET is placed in the degeneration experiment environment simulation case, temperature and humidity which are needed in an acceleration life experiment are set in the host computer, test times is predetermined, and the host computer carries out calculation, storage and analysis on acquired data. The system and the method are used for assessing reliability of the MOSFET.