49results about How to "The test method is simple and reliable" patented technology

The invention discloses a test method of fuel cell catalytic layer metal loads, and the method is as follows: (1) establishment of a standard curve, to be more specific, preparing more than three metal-element-containing catalysts with different loads on the surface of a substrate material according to a predetermined load, using an X-ray fluorescence spectrometer to test response signals of metal elements on the substrate material, using the ratio of response signals of the metal elements to response signals of a background sample as Y coordinates and the metal loads as X coordinates to draw the standard curve; (2) the catalytic layer load test, to be more specific, using the same background sample and same testing conditions of the standard curve test to test response signals of the metal and the background sample; and (3) the catalytic layer load calculation, to be more specific, establishing a metal load calculation formula according to the standard curve, and substituting test results into the formula to calculate the corresponding metal loads. Compared with the prior art, the test method is simple, reliable and fast without damage on a fuel cell catalyst layer.

An error calibration method of an uniaxial north seeker comprises the following steps: firstly driving a rotary table to carry out four-position testing, and calibrating control drift angle between an instrument system and a carrier system of the uniaxial north seeker; then using the instrument system of the north seeker as a calibration coordinate system and controlling the rotary table to carry out corresponding position and rate testing; and finally finishing calculation of each error coefficient according to an error model of the uniaxial north seeker. The problem of indeterminate angle relation between the carrier system and the instrument system of the uniaxial north seeker is solved, and by the simple uniaxial north seeker's error compensation model and position and rate calibration method, error calibration of the uniaxial north seeker is realized. The calibration method is less time-consuming, has simple calculation and can be used to rapidly complete calibration test.

The invention relates to a BGA (ball grid array) welding point acceleration service life prediction method, which comprises the following steps that (a) n BGA welding point samples are randomly selected, wherein the n is greater than or equal to 5, and the BGA welding point samples are subjected to environment stress screening processing; (b) the samples processed in the step (a) are subjected to integral stress processing, and the integral stress processing comprises second temperature circulation processing, random vibration processing and electric stress processing on the samples processed in the step (a), and in addition, the sample failure time is recorded; (c) the samples processed in the step (b) are subjected to third temperature circulation processing; (d) a model shown in a formula (III) is used for calculating an acceleration factor, and finally, a formula (IV) is used for calculating the use average failure before time MTTR<use> for predicting the service life of the BGA welding point. The invention also provides application of the method to the preparation of electronic products and mechanical equipment.

The invention discloses a load spectrum testing method for an excavator working device. The method comprises the steps that firstly, displacement sensors and pressure sensors are arranged at all hydraulic cylinders of the excavator working device to obtain hydraulic cylinder telescopic amount data and hydraulic cylinder force data; then, cutting off is carried out on a bucket rod with a virtual plane, a disengagement body is obtained, the position of the gravity center of the disengagement body is calculated, a strain rosette is arranged on the part of the cut section on the bucket rod, the internal force component of the section is derived, the load time course of the tip of an excavator bucket is obtained through the section internal force according to the balance relation of force in combination with the structural size of the working device, and the load spectrum of the working device can be compiled with the load time course. The load spectrum obtained with the method includes the influence of the borne positive load in the excavating process, also includes the influences of eccentric loads and side loads, and coincides with the practical conditions better; the method is suitable for tests of load spectra of various excavator working devices and can also be used for load spectrum tests of other structures bearing movable load action.

The invention discloses a test method and a test device for asphalt pavement crack load response relative displacement. The test method comprises steps as follows: a, a reference part and a sensor positioning part are arranged on two sides of a to-be-tested crack, and a horizontal linear displacement sensor and a vertical linear displacement sensor are fixedly arranged on the sensor positioning part; b, a test vehicle is stopped in positions of the reference part and the sensor positioning part in Step a; c, the sensors are started, the test vehicle slowly runs forwards and passes by the sensor positioning part and the reference part sequentially, after the test vehicle runs for a proper distance, the sensors are turned off, and the test is finished. The test device comprises the reference part, the sensor positioning part, the horizontal linear displacement sensor, the vertical linear displacement sensor and a controller. Compared with the prior art, the test method and the test device have the advantages that horizontal and vertical relative displacement between two plates of the crack can be measured accurately, and the cause and the development degree of the crack are determined through displacement features.

The invention is based on the working principle of the satellite navigation signal simulator, and provides a calibration system and calibration method for the satellite navigation signal simulator pseudo range control precision. The calibration system comprises a satellite navigation simulator, a navigation signal control module, a high speed oscilloscope and a pseudo range precision analysis module; the calibration system and the calibration method set up a pseudo range precision control platform through the measurement principle of the carrier wave phase method and form a test scheme which is accurate, practical and effective. The test method can reliably and accurately detect the pseudo range control accuracy of the satellite navigation signal simulator.

The invention relates to a method for detecting the surface viscosity of prepreg tows for automatic tow placement, and belongs to the technical field of prepreg automatic tow placement molding. The method comprises the steps that firstly, two prepreg tows are pre-bonded, the main axis direction of the bonding surface of the two prepreg tows is the same as the direction of carbon fibers in the prepreg tows, then a bonding area is placed on a mechanical hot pressing platform for hot pressing lap joint, the prepreg tows are separated from the hot pressing platform by a demould material, a temperature required for the lap joint is 10DEG C-60DEG C, the pressure for the lap joint is 0.1MPa-0.6MPa, and the time for the lap joint is 1min-10min; and then, a sample is symmetrically clamped on a clamp of a tensile tester, the tensile tester is started, and a tensile failure load of the prepreg tow sample is used as a quantitative characterization result of the surface viscosity. A surface viscosity value of the prepreg tows obtained by the method can be directly used for comparing the surface viscosity of various materials, can further be used for exploring the influencing factors of the surface viscosity of the prepreg tows, and has wide application prospects in practical production and scientific research fields.

The invention relates to an environmental stress screening method for BGA (ball grid array) welding spots. The environmental stress screening method includes steps of a), randomly selecting n BGA welding spot samples and carrying out environmental stress screening processing on the BGA welding spot samples; b), carrying out comprehensive stress processing on the samples processed in the step a), to be more specific, carrying out second temperature cycle processing, random vibration processing and electric stress processing on the samples processed in the step a), recording failure time of the samples, and screening the BGA welding spots according to mean processing time to failure. The n is larger than or equal to 5. The invention further provides application of the method to manufacturing electronic products and mechanical equipment.

The invention provides a system for detecting dynamic range of a satellite navigation signal. The system comprises a satellite navigation signal simulator, a frequency meter, a frequency automatic collecting device and a dynamic range analysis and calculating module. The system for detecting the dynamic range of the satellite navigation signal is utilized. The invention also provides a method for detecting the dynamic range of the satellite navigation signal; on the basis of satellite navigation signal simulator working principle and Doppler effect, a radio frequency signal received by a receiver under different dynamic environments can be simulated in real time, the method for detecting the dynamic range of the satellite navigation signal is analyzed at the aspects, such as speed, acceleration and jerk, a dynamic range detecting platform is built, a specific testing scheme is formed, and the experiment is conducted to verify the correctness, practicality and effectiveness of the testing method. The testing method has the advantages that the simplicity, convenience and reliability are realized, and the dynamic range of the satellite navigation signal can be correctly detected in the simulating environment.

The invention provides a real-time detection method for the compactness of a poured vault. The real-time detection method comprises the following specific steps of: mounting an acoustic wave testing device below an vault template; establishing an offline acoustic waveform database; transmitting an acoustic wave signal to the vault template by a transmitting unit, and receiving the acoustic wave signal by a receiving unit; comparing detected waveform data transmitted back by a receiver with data in the acoustic waveform database in real time by an upper computer, and matching a waveform with the highest overlap ratio with the current compactness echo in the database; and performing measurement compactness degree judgment on the matching degree of the waveform data by the upper computer. Byadopting the real-time detection method, the vault compactness monitoring in the whole process of concrete pouring and solidification can be effectively met, and the quality of secondary lining is practically guaranteed; and a non-contact vault detection mode is adopted, the device is mounted on a vehicle, any operation such as paving a detection piece before construction is not needed, and the simplest, more convenient and more reliable test method is provided.

The invention relates to ceramic fibers, in particular to a ceramic fiber resistivity testing method. Multiple ceramic fibers are parallelly bonded to a metal plate sample table through double-sided adhesive tapes; the fibers are parallelly connected through silver conductive adhesive; after the silver conductive adhesive solidifies, a fiber sample and the metal plate sample table are put in a metal electromagnetic shielding box; the metal plate sample table, an electrometer for testing circuit current and a digital source meter providing test voltage are connected in series; under the constant-temperature constant-humidity condition, a micro current test is performed; after one current value is measured, voltage output of the digital source meter is closed; the metal electromagnetic shielding box is opened, one fiber is torn off, and corresponding micro current of the remaining parallel fibers is continually measured until that the current of the different fibers is all tested; resistivity values of the multiple groups of fibers different in quantity are solved according to the ohm law and a volume resistivity formula, and a statistical average is acquired. The problem that high resistance of the fine-diameter ceramic fibers cannot be accurately measured can be effectively solved.

The invention discloses a piezoelectric body multi-field coupling induced vibration fatigue experiment device and a test method. The piezoelectric body multi-field coupling induced vibration fatigue experiment device comprises a vibration excitation device, a temperature field loading device and an electric field loading device, wherein the vibration excitation device uses a non-contact magnetic force between a rotating magnetic field and a magnet as an excitation force; the temperature field loading device arranges a heating coil around an experimental object; and the electric field loading device applies a controllable electric load to an experiment object by connecting the experiment object with an external adjustable power supply. The device is simple, easy to use, low in cost and highin controllability, can provide stable and controllable force load or force, electric load or heat, force load or heat, force and electric load for the experiment object, is high in accuracy of experimental results, and has important value for researching the vibration fatigue life test problem of the piezoelectric structure under the multi-field coupling loading effect.

The invention discloses a method for testing a control board of an electromagnetic valve, comprising the following steps of: (1) selecting an electromagnetic valve, respectively mounting laser emitters with different heights at two sides of the electromagnetic valve, and correspondingly mounting a photoelectric sensor at the other side of the electromagnetic valve provided with the laser emitter; (2) mounting the control board of the electromagnetic valve to be tested at the side of the electromagnetic valve, carrying out a test of starting delay time and releasing delay time on the control board of the electromagnetic valve through a magnetic valve control board tester, and sealing the tested control board of the electromagnetic valve with glue; (3) repeating the test of starting delay time and releasing delay time to the tested control board of the electromagnetic valve after the glue sealing, wherein the control board of the electromagnetic valve passing the secondary test is qualified. The test method of the invention is simple and reliable, the qualified control board of the electromagnetic valve has strong practicability and long service life.

The invention relates to a prepreg splicing strength detection method for automatic placement, which belongs to the technical field of prepreg automatic placement forming. According to the requirementof ultra-long preprepreg tow in automatic placement forming technology, the invention provides a method for detecting the strength of prepreg tow splicing head for the first time. The invention analyzes the stress condition of the prepreg tow splicing head in practical application, measures the flat tensile failure strength at a joint by using a tensile tester, and measures the peeling damage strength at the joint by using a peeling tester. The two strength parameters obtained were used as the splicing strength of the prepreg in the flat state and the curved state respectively. Two differentangles are quantified to get the result. The invention is capable of fully reflecting the strength of the prepreg tow splicing head in practical applications.

The invention discloses a method and system for testing video stability, and relates to the technical field of network communication. The method for testing video stability includes: acquiring video data of a first video played on a first terminal through a router, and downloading the video Playing the data to obtain a second video; comparing the first video with the second video to determine the number of freezes of the second video; judging whether the number of freezes of the second video exceeds a preset The number of times; if it exceeds, it is considered that the playback of the second video is unstable. The method provided by the invention is simple and convenient to test and deploy, and can automatically calculate the number of freezes during the playing process of the video, so as to judge the stability of the playing video.

The invention discloses a method for testing the pore closing temperature of a diaphragm. The method comprises the following steps: preparing a first standard diaphragm, a second standard diaphragm, athird standard diaphragm, standard green adhesive tapes, a standard copper foil and a standard aluminum-plastic film, wherein the middle of the standard green plastic adhesive is provided with a circular hole with a preset diameter; respectively pasting one to five layers of the first standard diaphragm to one of the standard green adhesive tapes to obtain a first target diaphragm; respectively pasting one to five second standard diaphragms to one of the standard green adhesive tapes to obtain a second target diaphragm; respectively pasting one to five layers of the third standard diaphragm to one of the standard green adhesive tapes to obtain a third target diaphragm; sequentially assembling the first target diaphragm, the second target diaphragm, the third target diaphragm, the standardcopper foil, the standard aluminum-plastic film and a preset battery to obtain a corresponding flexibly packed battery; and measuring impedance of the flexibly packed battery by adopting an electrochemical workstation, linearly fitting the ohmic impedance value and the diaphragm layer number, and calculating the ion conductivity of the diaphragm to obtain the catastrophe point of the ion conductivity of the diaphragm, that is the corresponding pore closing temperature of the diaphragm.

The invention belongs to the technical field of special vehicles, and particularly relates to a bench test method for automatic locking and unlocking control of a special vehicle comprehensive transmission device. The method comprises the following steps: under the condition that a bench test cannot provide real vehicle bus information, reading a bus signal and specific parameters of the comprehensive transmission device; judging whether the comprehensive transmission device works under the working condition of the bench or not; under the bench test working condition, a fan is set to work under the mechanical working condition, the rotating speed of the fan is collected, the rotating speed of the engine is obtained according to the rotating speed ratio of the fan to the engine, a hydraulictorque converter is controlled to be automatically locked and unlocked through an engine rotating speed signal, so that the automatic locking and unlocking function test of the hydraulic torque converter under the bench working condition is achieved. According to the method, the automatic locking and unlocking bench test of the comprehensive transmission device can be carried out under the condition of lack of a real vehicle environment without adding extra equipment and operation, the problem that the automatic locking and unlocking function cannot be tested in the bench test is solved, andthe test method has the characteristics of simplicity, reliability, good real-time performance, low cost and the like.