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2385 results about "Tested time" patented technology

Rock sample detection and data acquisition system and method and application thereof

InactiveCN102053253ATo overcome the insufficiency of the experiment of the physical parameters of coal and rock after the adsorption of gas is difficultImplement testMaterial strength using tensile/compressive forcesSeismic signal receiversUltrasonic sensorData acquisition
The invention relates to a rock sample detection and data acquisition system. The system can realize elastic parameter test of a rock sample in the state of gas adsorption; in the system, a three-shaft pressure cabin is connected with a gas supply and metering control device for absorbing samples in the cabin and accurately metering absorption quantity, moreover, an ultrasonic transducer is installed on a cap of the (high) pressure cabin and integrated with an ultrasonic wave transmitting/receiving device so that the test of elastic parameters of methane absorption on coal can be realized truly. The system can automatically and continuously test in the processes of gas absorption and gas enrichment, thereby ensuring a consistent test environment, acquiring an absorption quantity and elastic parameter relation curve, improving test accuracy and efficiency and saving test time and cost. The rock sample detection and data acquisition system integrates methane enrichment mechanism simulation and rock physical property test, can be applied to seismic prospecting method research on coalbed methane and shale gas, mine advanced detection, coal mine safety research and the like.
Owner:CHINA PETROLEUM & CHEM CORP +1

High-speed dynamic simulation test method for electric mainshaft bearing

The invention relates to a high-speed dynamic simulation test method used for an electric mainshaft bearing. The electric mainshaft bearing comprises a frame, a main body pedestal, an axial loading cylinder, a test head assembly, a main body gland, a radial loading cylinder, a shaft coupling, a protecting hood, an electric mainshaft, a lubricating oil pipe, an axial loading oil pipe, a vibration sensor, a radial loading oil pipe and a temperature sensor and also a final assembly of all the parts. A hydraulic loading system is started to provide pressure oil to the axial loading cylinder and the radial loading cylinder, the electric mainshaft drives a test mainshaft to rotate, the radial loading cylinder exerts radial force on a first test accompanying bearing and a second test accompanying bearing through a radial loading sleeve, and the radial loading cylinder exerts axial force on a first test bearing and a second test bearing through an axial loading sleeve. The entire test is controlled by a computer to display parameters of the rotating speed, the axial load and the radial load, the oil pressure, the cooling water temperature, the bearing temperature, the bearing vibration, the power current of the electric mainshaft and the test time, and the parameters are saved in a computer database and analyzed.
Owner:国创(洛阳)轴承产业技术研究院有限公司

Prediction method for q-precentile life of intelligent meter

The invention discloses a prediction method for the q-precentile life of an intelligent meter and relates to the technical field of reliability estimation of accelerated degradation data. The method comprises the following steps: performing degradation path modeling according to test data, and obtaining the pseudo life estimation of the intelligent meter under all stress levels according to the failure threshold value of given parameters; building a Weibull distribution-based accelerated degradation model of three parameters, such as temperature, humidity and electrical stress according to the pseudo life estimation results of the intelligent meter under all stress levels of an accelerated degradation test, so as to obtain the point estimation and covariance estimation of the acceleration model; and obtaining the lower estimation of parameter service life of the intelligent meter under a given reliability degree and a given confidence degree in normal use conditions according to the point and covariance matrix of the parameters of the accelerated degradation model. Due to the adoption of the method, the test time is effectively shortened, the test expense is reduced, and the quick and accurate estimation of a stable period of an accelerometer is realized.
Owner:JIBEI ELECTRIC POWER COMPANY LIMITED CENT OF METROLOGY +1

Test device of model for manufacturing rock masses containing interlayers and test method thereof

The invention discloses a test device of a model for manufacturing rock masses containing interlayers and a test method thereof. The test device of the model for manufacturing the rock masses containing interlayers comprises a semicircular angle device, an upper baffle, a lower baffle, a left side plate, a right side plate, a circular turntable, a core-drilling machine drill bit, a flat plate, a flat plate angle control rod, a fixed screw rod, a base plate, an interlayer model test piece, a U-shaped plate and a guide slot. The test method comprises the following test steps: arranging the rock masses according to an outline central line and fixing the rock masses; manufacturing interlayer materials and casting the model, fastening the test piece, drilling the core, replacing the core-drilling machine drill bit, changing the position of the test piece to drill repeatedly and cutting to obtain the test pieces with different height-diameter ratios or obtain the test pieces with different interlayer inclination angles; then carrying out mechanical test. The test device is simple in structure and suitable for manufacturing the test pieces with different interlayer thicknesses, inclination angles and height-diameter ratios; according to a core-drilling and cutting machining device, by making full use of the existing device, the influence on the mechanical properties of the test pieces caused by different conditions can be analyzed, coring of irregular rock samples taken in the site can be carried out directly, so that the test efficiency is improved and the test time is shortened.
Owner:CENT SOUTH UNIV

Information safety penetration testing method for distribution automation system

The invention discloses an information safety penetration testing method for a distribution automation system. Penetration testing is carried out on a master station system, a distribution network terminal and a communication channel, the information system vulnerability penetration testing technology is fully used, the safety of the distribution automation system is evaluated by simulating the attack method of a hacker, and the information safety penetration testing method includes the active analysis for any weakness, technical defects or loopholes of the master station system, the communication circuit and the distribution network terminal. The information safety penetration testing method for the distribution automation system can be used for safety risk analysis work before the distribution automation system is connected to the internet, guidance is provided for finishing problem rectification and reformation and retest work of manufacturers with safety risks, and the method is high in pertinence and wide in test range. Compared with a traditional penetration testing method, the test time can be largely shortened, offline repairing events caused by safety problem failures after equipment is on line are reduced, the information safety penetration testing for the distribution automation system is realized, and the information safety penetration testing method can be applied to industrial control systems inside and outside the industry.
Owner:STATE GRID CORP OF CHINA +1

Indoor rotary wheel rutting test machine for asphalt mixture

The invention discloses a tracking tester of indoor rotary tar hybrid material, which is characterized by the following: the rotary rack with rotary shaft is set on the floor of experimental table and in the environmental box; the top of rotary table pillar connects the experimental table panel; the speed adjustment motor contains electric rack, bearing support seat and heating pipe, which connects the rotary shaft through driving structure; the bottom of driving shaft is set on the bearing support seat; the rotary bearing is set between the rotary shaft and bearing support seat; the rotary bridge is set on the rotary shaft; the bearing sleeve and bearing are set between the rotary bridge and rotary shaft; rubber tyre column slide cylinder within at least one rubber tyre column is set on the rotary bridge; the weight block holder is set on the rubber tyre column to load the weight block and the rubber tyre is set on the bottom; the limitation column and at least two steel molds are set on the experimental table panel to assemble test piece of tar hybrid material with pad board among steel molds; the temperature controller is set on the exterior of environmental box. The invention shortens the test time and improves the efficiency, which can be used in the tracking-proof experiment of tar hybrid material pavement.
Owner:CHANGAN UNIV

Negative pressure osmosis test device

InactiveCN103411869ASolving Penetration Testing ProblemsSimple structurePermeability/surface area analysisWater storageVacuum pumping
The invention discloses a negative pressure osmosis test device which comprises a base, a soil sample ring, a porous permeable stone, a water storage container, an electronic balance, a vacuum pump, a pressure gauge and a sealed container, wherein the soil sample is arranged in the cylindrical soil sample ring, the upper end of a sample is connected with the water storage container, and the bottom end of the sample is connected with the sealed container and the vacuum pump; a pressure difference is formed at two ends of the soil sample through vacuum-pumping, and water seeps in the soil sample under the action of the pressure difference; an osmotic coefficient of the soil sample can be obtained through calculating the amount of water passing though the soil sample in unit time; a load applying piston at the upper end of the sample can apply vertical load so as to solidify the soil; osmosis tests of different solidifying pressures can be performed to simulate the seepage of the practical field soil under different stress environments; the osmosis test can be directly performed on the prepared soil sample. Therefore, the test device has the advantages of simple structure, convenience in use, quick and convenient test, and obviously shortened test time, and is particularly suitable for the osmosis test of low-osmosis soil samples.
Owner:HEFEI UNIV OF TECH

Reliability acceleration test method of electronic products

ActiveCN105572498ASolve engineering problems that are difficult to test and identify indicatorsSynthetic Stress Conditions for Growth TestsEnvironmental/reliability testsTemperature stressAcceleration factor
The invention discloses a reliability acceleration test method of electronic products, and belongs to the field of reliability designing and testing. The method comprises steps of firstly presetting an acceleration test temperature change curve boundary according to working stress limit obtained via a routine test for reliability of an electronic product, carrying out simulating calculation of temperature acceleration factors, and modifying and determining initial acceleration test temperature stress change curves; and secondly, calculating vibration acceleration factors according to the initial acceleration test temperature stress change curves and a test profile of the routine test for the reliability of the original electronic product, calculating acceleration test vibration stress change curves according to the vibration acceleration factors, and according to the acceleration test vibration stress change curves, determining the final temperature stress change curves and determining acceleration test time. According to the invention, by following the thought of testing and examining working stress of a product and properly increasing test stress level, test time is shortened; a reliability test of the electronic product can be accelerated; and diversity and controllability of the acceleration factors are achieved.
Owner:XIAN AIRCRAFT DESIGN INST OF AVIATION IND OF CHINA

Method for measuring high-temperature creep crack growth threshold value of material

The invention discloses a method for measuring high-temperature creep crack growth threshold value of material. The method comprises the following steps of: for a specific material, according to the creep crack growth test requirement, processing at least 6 standard compact tension specimens, performing crack prefabrication for the well processed at least 6 specimens on a fatigue performance tester, wherein the prefabricated crack length is 0.5 times of the width of each specimen; wedging a wedge-shaped block into an initial notch of each specimen, placing the headmost end of the straight part of the wedge-shaped block at the position of a loading line, providing displacement for the loading line, forming a stress-strain field characterized by a stress strength factor at the tip of the specimen crack, and providing a driving force for the creep crack growth, wherein the specimens with different initial stress strength factors grow after certain time under creep effect in high-temperature environment, and in the same time interval, the crack growth lengths are different; drawing for the different stress strength factors and the corresponding crack growth rates, and solving the creep crack growth threshold value of the material through an extrapolation method. According to the method provided by the invention, multiple specimens can be tested for one time, and thus, the test cost is greatly reduced and the test time is greatly shortened.
Owner:BEIHANG UNIV

Method for testing acceleration reliability of antiskid brake control box of airplane

The invention relates to a method for testing the acceleration reliability of an antiskid brake control box of an airplane. Temperature stress, vibration stress and humidity stress are comprehensively applied, and an electrifying working condition capable of stimulating a fault is selected in a test process, thus the working frequency of the control box is improved, the fault hidden trouble of the control box is stimulated, and the test time is shortened. The test process is carried out according to a test cross section in a circulating way until the required reliability index is met. In the method provided by the invention, the electrifying working condition and the working frequency in service are converted into the test time, and the working frequency adopted in the test process is higher than the actual working frequency in service. After the test is finished, the met reliability index is evaluated according to a method in GJB (Guo Jun Biao) 1407 and the confidence degree recommended in GJB1407, and the confidence degree for evaluating the reliability index is 90%. In the method provided by the invention, a pulsating current of 0-40mA is applied, fault hidden troubles of the control box in various working conditions are verified, an acceleration reliability test on the control box is realized, and test data can be used for evaluating the reliability index of the control box.
Owner:XIAN AVIATION BRAKE TECH
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