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48results about How to "Avoid duplication of experiments" patented technology

Method for homogenizing residual stress through vibration positioning

The invention relates to a method for homogenizing residual stress through vibration positioning. The method comprises the following steps of: (1) simulating the machining process of aging workpieces to obtain the distribution of a residual stress field in the workpieces quantitatively; (2) determining the specific position of the residual stress which needs to be homogenized according to the step (1); (3) performing model analysis on the workpieces to optimize a vibration mode, so that a high stress area of modality corresponds to a high residual stress area of the workpieces; (4) determining a support point, an excitation point and excitation frequency according to the optimized vibration mode; (5) performing dynamic analysis on vibration aging to optimize excitation force; (6) performing fatigue analysis on the vibration aging to optimize the excitation force and excitation time; (7) vibrating the workpieces by using optimized vibration aging process parameters; (8) determining thenext high residual stress position which needs aging; and (9) repeating from the step (3) to the step (8) until the stress field is homogenized. The method has the advantages of low running cost, short period, energy conservation, environmental protection, stable aging effect and small fatigue damage.
Owner:BEIHANG UNIV

Co-base installation-based transfer alignment accuracy quantitative evaluation method

ActiveCN105973268AAlignment Accuracy EvaluationAlignment assessmentMeasurement devicesComputation complexityAutocollimation
The invention belongs to the field of inertial navigation system performance assessment and relates to a co-base installation-based transfer alignment accuracy quantitative evaluation method aiming at strapdown inertial navitation system transfer alignment accuracy. The method comprises installing slave and main inertial navigation devices sharing a base on an aluminum plate, constructing slave and main inertial navigation device orientation installation misalignment angles, putting the aluminum plate with the slave and main inertial navigation devices on a high precision rotary table, guiding the y axis of the main inertial navigation device to point to the true north direction through an optical sighting telescope, measuring slave and main inertial navigation device y axis orientation installation error angles as orientation installation error angle reference values through a laser tracker and starting the main inertial navigation device to carry out autocollimation. The method can acquire alignment accuracy evaluation reference before transfer alignment and through comparison between the reference value and the evaluation value, alignment accuracy quantitative evaluation is realized. The method is free of slave inertial navigation device navigation calculation and smooth calculation after alignment, greatly reduces computation complexity and data storage demands and realizes repeated tests in short time.
Owner:HARBIN ENG UNIV

Notched test piece based meshing gear bending fatigue limit evaluation method and device

The invention discloses a notched test piece based meshing gear bending fatigue limit evaluation method and device. The method includes the steps of 1), establishing meshing gear pair finite element models; 2), establishing finite element models of notched test pieces; 3), determining stress concentration factors of model root portions in the step 1), and establishing relation curves of the stress and the depth of tooth surfaces; 4), determining stress concentration factors at the positions of notches of the test pieces in the step 2), and establishing relation curves of the stress and the depth of notched surfaces; 5), comparing consistency of the stress concentration factors in the steps 3) and 4) with the overlap ratio of the relation curves, repeating the step 4) and determining final geometric parameters and fatigue limit load of the notched test pieces; 6), determining the length of inherent cracks of materials; 7), performing modeling on gears of optional dimensions, repeating the steps of 3), 4) and 5), and determining the geometric parameters and load features of the corresponding notched pieces; 8), establishing gear bending fatigue limit estimation models; 9), establishing equivalent stress relation of the notched test pieces and the gears and determining gear bending fatigue lives.
Owner:BEIJING INSTITUTE OF TECHNOLOGYGY

Cross flow transition experimental data expansion technology based on stability method

The invention relates to a transition experiment data expansion technology, and discloses a cross flow transition experimental data expansion technology based on a stability method. The method comprises the steps: employing stability analysis means with reliable theoretical support to analyze existing wind tunnel experiment and flight test data; according to incoming flow parameters or physical property parameters such as incoming flow Reynolds number, attack angle and surface roughness which have significant influence on the cross flow transition position, changing the parameters in a range suitable for a stability theory, and obtaining a theoretical solution of the cross flow transition position, so continuation of experimental data is realized. Compared with a flight test and a wind tunnel test, the method has the characteristics of low cost, easiness in implementation and high reliability, is used for supplementing and expanding experimental data, and makes up the defects of high cost, long period and high difficulty of direct data supplementation at present.
Owner:AERODYNAMICS NAT KEY LAB

Detection method of water stability of cold region large-grain-size asphalt mixture

The invention belongs to the road engineering technical field, and in particular, relates to a detection method of water stability of a cold region large-grain-size asphalt mixture. The detection method comprises the steps: firstly, carrying out rolling compaction on the large-grain-size asphalt mixture into two plate block specimens, and cutting each plate block specimen into 6 small prismoid beam specimens; randomly selecting 3 specimens from the 6 small prismoid beam specimens of each plate block specimen, and forming an A group and a B group; making 6 specimens of the A group not soaked in water, making 6 specimens of the B group placed under freeze-thaw conditions, carrying out bending tests on the two groups of specimens, measuring the freeze-thaw flexural-tensile strength ratio BSR[dr] and the freeze-thaw flexural-tensile failure strain ratio FSR[dr] of the specimens, and when the average freeze-thaw flexural-tensile strength ratio BSR[dr] and the average freeze-thaw flexural-tensile failure strain ratio FSR[dr] of the two groups of specimens are both greater than or equal to 85%, considering that the water stability of the large-grain-size asphalt mixture is good. The method solves the problems of specimens molded by a traditional Marshall compaction testing method, and puts forward a new water stability testing method integrating the low temperature stability and the water stability of the asphalt mixture.
Owner:SHENYANG JIANZHU UNIVERSITY

Aluminum alloy guide line monofilament axial stress fatigue test clamps and clamping method thereof

The invention discloses an aluminum alloy guide line monofilament axial stress fatigue test clamps and a clamping method thereof, and belongs to the technical field of high cycle fatigue tests of an aluminum alloy guide line monofilament. A total of two groups of the clamps is provided; each group of clamps is composed of two single-sheet clamps, and the thickness of the single-sheet clamps is 2-5 times of the diameter of a guide line monofilament; each single-sheet clamp is provided with a semi-cylindrical groove; the surface of the semi-cylindrical groove of each clamp and a clamping end of a to-be-tested aluminum alloy monofilament are respectively subjected to shot blasting treatment; during clamping, the clamping end of the guide line monofilament is inserted into the semi-cylindrical grooves of the clamps, then the two groups of the clamps are clamped into a fatigue machine in a upper-and-lower symmetry manner, and the upper part and the lower part of the aluminum alloy guide line monofilament are guaranteed to be parallel to the loading axis direction; fatigue test parameters are set, and a fatigue test is carried out. With adopting of the clamps and the clamping method thereof, the fatigue life test precision of the aluminum alloy guide line monofilament is improved to a greater extent.
Owner:INST OF METAL RESEARCH - CHINESE ACAD OF SCI +1

Automatic centering device of electric spindle reliability test platform based on drag loading

The invention discloses an automatic centering device of an electric spindle reliability test platform based on drag loading, and aims to solve the problems of incapable of timely monitoring generation of singularity and elimination and time and labor wasting when adjusting centering of the test platform, the device comprises a spindle position adjusting part, a detection part and a monitoring andautomatic control part; the detection part comprises a supporting device, a feeding device and a detection device; the spindle position adjusting part is arranged at the middle position of an horizoniron through a first to forth static pressure sliding platform, wherein the first static pressure sliding platform and the second static pressure sliding platform are arranged at the left side of thehorizon iron, and the third static pressure sliding platform and the fourth static pressure sliding platform are arranged at the right side of the horizon iron; the detection part is arranged at themiddle position of the horizon iron through a first supporting base and a second supporting base, supporting devices are arranged at the front side and rear side of the spindle position adjusting part, and the feeding device is arranged on the supporting devices; a first laser centering instrument and a second laser centering instrument in the detection device are fixed on a fixing plate in the feeding device; and the monitoring and automatic control part is connected with the spindle position adjusting part and the detection part through wires.
Owner:JILIN UNIV

Method for testing environmental adaptability of optical fiber sensing system

The invention relates to a method for testing the environmental adaptability of an optical fiber sensing system. The method comprises three parts namely a hardware connection phase, a test preparation phase and a test phase, wherein the hardware connection phase comprises the step of preparing a temperature and humidity environmental test chamber, a prototype to be tested, an industrial control computer, a double-layer shielded network cable, a power line and an optical fiber disc; the test preparation phase comprises the following steps: starting the prototype to be tested and the industrial control computer, starting system control software in the industrial control computer after network communication between the prototype to be tested and the industrial control computer is normal and starting to monitor the running state of the prototype to be tested; the test phase comprises the following steps: setting a variety of temperatures and operations and monitoring test results to obtain monitoring conclusions. According to the method provided by the invention, the nominally harshest operating temperature and humidity environment of a product is selected, so that the product runs under the extreme environment, therefore, assistance is offered to device selection and design improvement; the product online runs in the test process and is monitored in real time; conditions under high-temperature test, low-temperature test and damp heat test before testing and data are contrasted.
Owner:BANDWEAVER TECH CO LTD

Six-component high-precision micro rolling torque measuring device and measuring method

The invention discloses a six-component high-precision micro rolling moment measuring device, which relates to the technical field of aerospace wind tunnel force measurement tests, can simultaneouslymeasure six aerodynamic components with extremely different loads acting on a test model, and adopts the specific scheme that the six-component high-precision micro rolling moment measuring device comprises a main balance element, a bearing, a model connecting sleeve, a balance supporting rod, an air inlet pipe and an air outlet pipe, wherein the main balance element comprises a supporting rod endand a main balance element model end which are located at two ends respectively, the supporting rod end is connected with the balance supporting rod, the main balance element model end is connected with a stator of the bearing, and a rotor of the bearing is connected with the model connecting sleeve; a rolling resistance element is annularly arranged at the periphery of the main balance element,the rolling resistance element comprises a fixed end and a rolling resistance element model end, and the fixed end is connected with the main balance element model end. The six-component high-precision micro rolling moment measuring device provided by the invention can avoid repeated tests in the same test state, improves test data precision, reduces the test train number, and reduces the test cost.
Owner:INST OF HIGH SPEED AERODYNAMICS OF CHINA AERODYNAMICS RES & DEV CENT

Method for inducing phase-change material film crystallization by using ultrashort pulse pico-second lasers at different wavelengths

Provided is a method for inducing the phase-change material film crystallization by using ultrashort pulse pico-second lasers at different wavelengths, belonging to the technical field of film crystallization. The device includes a control center and a base light source device that are connected, the light emitted by the base light source is irradiated on a film via a lens. The method includes the following steps of (1) plating a film on the selected substrate by means of magnetron sputtering; (2) using the material obtained in (1), and using a basic lens to irradiate the material with the laser in appropriate energy under the same base light source to make the material undergo phase change, wherein the base light is a pico-second pulse laser at the wavelength of 1064nm; or replacing the lens, under the effect of a frequency multiplication crystal, irradiating the material with the laser in appropriate energy as the wavelength changing into 532nm or 355 nm to make the material undergo phase change.
Owner:BEIJING UNIV OF TECH

Screening method of chips for tiny satellite

The invention provides a screening method of chips for a tiny satellite. The screening method comprises the following steps: selecting the chips of the same batch for a destructive test which is used for evaluating chip technology and material performance so as to obtain test-result-qualified chips, the destructive test is used for having a reliability screening to the test-result-qualified chips in the destructive test in order to obtain chips which are capable of being used for the tiny satellite, and the reliability screening is used for evaluating service lives of the chips. The screening method of the chips for the tiny satellite solves the technical problem that the screening methods in the prior art can not ensure that checkout test set (COTS) chips are applied to the field of aerospace.
Owner:NAT UNIV OF DEFENSE TECH

Measurement correction method, device and equipment for blade grid air film cooling test and medium

The invention provides a measurement and correction method for a cascade air film cooling test, which is applied to a test piece blade, is divided into a measurement area and a measurement and correction area, and comprises the following steps: acquiring the wall surface temperature, the external fluid temperature and the cold air temperature of the test piece blade; respectively obtaining a measurement air film cooling effectiveness degree corresponding to the measurement area and a correction air film cooling effectiveness degree corresponding to the measurement correction area through calculation; and based on a measurement correction model, correcting the measured air film cooling effectiveness through the corrected air film cooling effectiveness to obtain the heat insulation air film cooling effectiveness of the test piece blade. According to the test measurement method, a measurement part and a measurement correction part are integrated on the same test piece, so that a large number of repeated tests are avoided, and the negative influence of some uncertain factors generated by disassembling and assembling the test bed in the experiment process on the experiment is avoided.
Owner:SHANGHAI ELECTRICGROUP CORP

Ultrasonic sound field three-dimensional imaging virtual laboratory

InactiveCN102865919AAvoid duplication of experimentsSolve the problem of no relevant detection equipmentSubsonic/sonic/ultrasonic wave measurementThe InternetSound file
The invention discloses an ultrasonic sound field three-dimensional imaging virtual laboratory, which mainly comprises a sound wave acquiring device and a date server, wherein an ultrasonic signal processing unit in the sound wave acquiring device is matched with a three-degree-of-freedom lead screw sliding table unit, and can be used for acquiring the distribution situation of an ultrasonic sound field in a three-dimensional space and storing in the data server. By means of a network service unit of the data server, a remote user can access ultrasonic sound field distribution data through the Internet, select a drawing method for drawing an ultrasonic three-dimensional image freely, and observe and control the sound wave acquiring device through a WEB interface to virtualize a laboratory special for researching ultrasonic three-dimensional sound filed imaging on the network. The ultrasonic sound field three-dimensional imaging virtual laboratory is particularly suitable for a laboratory related to the transmission rule of ultrasonic waves in a fluid medium, and a remote experimental platform and a data sharing center are provided for researchers of relevant subjects.
Owner:HOHAI UNIV CHANGZHOU

Method of eliminating influence of comb-spectrum noise upon vibrational energy level

The invention discloses a method of eliminating influence of comb-spectrum noise upon vibrational energy level and aims to solve the technical problem that the existing method of eliminating the comb-spectrum noise is poor in practicality. According to the technical scheme, the method includes: determining related technical parameters, and constructing a corresponding band-pass filter with a Fourier kernel function as a primary function; adding a frequency-shifting factor to obtain a comb band rejection filter which is satisfactory; combining a power spectrum of an original signal and the constructed comb band rejection filter, and filtering, under a frequency domain, periodic interfering components in the original signal; according to post-filtering spectral amplitude, performing calculating to obtain power spectral density, and performing calculating with the power spectral density according to a frequency band to obtain a one-third octave band spectrum. The method has the advantages that interfering signals distributed at equal intervals can be filtered; the vibrational energy level is directly calculated under the frequency domain, repeated testing done for false vibration alarm can be avoided by correcting the false alarm on the vibrational energy level, caused by interfering noise; test cycle can be shortened; the method is highly practical.
Owner:中国船舶重工集团公司第七〇五研究所

Reaction kettle used for diode failure analysis experiment

The invention discloses a reaction kettle used for a diode failure analysis experiment in the diode detection technology field. The reaction kettle comprises a body and an end cap. The body is in a circular cup shape and an upper end of the body is opened. An inner wall and a bottom of the body are provided with annular grooves. Heating wires are fixed into the grooves. An outer side of the heating wires is provided with a reaction cup. The end cap is hinged to one side of the upper end of the body through a hinge. A shape of the end cap matches with the body. The end cap is provided with several drain holes. A lower end of one side of the end cap is bulged downwardly to form a clamping bench, wherein the side of the end cap is opposite to the hinge. One side of the upper end of the body, which is opposite to the hinge, is provided with a clamping groove. The clamping bench and the clamping groove are cooperated. In the scheme, the heating wires are used to heat the reaction cup so that instability and dangerousness of the experiment are reduced; through setting the end cap with the drain holes, a sample can be prevented from dropping; the experiment does not need to be repeated and experiment efficiency is increased.
Owner:CHONGQING CASEY YI ELECTRONICS TECH CO LTD

Optical element coating device and coating method

The invention relates to an optical element coating device and coating method, and belongs to the technical field of optical equipment. The optical element coating device and coating method can be applied to the technical field of film optic preparation. According to the method, a metal material is used for designing a film thickness uniformity compensation device, the film thickness uniformity compensation device is placed at a center position, of a certain height, between two evaporator sources, in a coating process, a baffle state is not changed, the film thickness of the two evaporator sources can be amended at the same time, and the evenness of the two evaporator sources are not interfered mutually.
Owner:BEIJING RES INST OF SPATIAL MECHANICAL & ELECTRICAL TECH

Method and device for predicting drug-target interaction relationship

PendingCN112216353AAvoid matrix operationsAvoid long cycleChemical property predictionMolecular designDiseasePredictive methods
The invention discloses a method and device for predicting a drug-target interaction relationship. The method comprises the following steps: introducing drug-target interaction and target-disease interaction to construct a three-layer heterogeneous network of drug-target-disease; constructing a drug similarity matrix and a target similarity matrix based on the three-layer heterogeneous network, wherein the target similarity matrix comprises an inter-target Gaussian kernel similarity matrix and a target-disease Gaussian kernel similarity matrix; calculating a Kronecker product of the drug similarity matrix and the target similarity matrix, and obtaining a prediction result through a regularized least square method; and verifying the prediction result. Compared with a traditional predictionmethod, the method has the advantages that a more complete network structure model is adopted, a more complex similarity matrix space is established, brand-new drug-target interaction is predicted from more perspectives, ultra-scale matrix operation is avoided in the calculation process, and compared with a common FLapRLS method and a common RLS_Kron method, the method provided by the invention has better prediction performance.
Owner:CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY

Test system and method thereof for frequency converter

The invention discloses a test system and method thereof for a frequency converter. The test system comprises a single-phase transformer, a motor switch, a circuit breaker, a test motor, a feedback motor, an excitation device, a test frequency converter, a power grid simulator, a magnetic heavy lad encoder, a NJ type torque sensor, a control system, a measuring system and a protection system, eachof power supply lines of the test system and load lines of the test motor and the feedback motor are all controlled by the circuit breaker to be switched on and off, after a specified voltage level power supply is selected, the test frequency converter drives the test motor, the test motor drives a rotor shaft of a feedback generator to rotate, so that the electric energy generated by the statorside of the feedback motor is converted into direct current power through a feedback frequency converter, and then the current is fed back to a direct current feedback common bus; the system has the advantages of integration, impact and errors caused by environments and labors when a test is carried out item by item are reduced, and reliability of the test is increased.
Owner:青岛海洋电气设备检测有限公司

A method for evaluating the anti-single event effect ability of sip devices

ActiveCN105093020BSingle event effect test implementationAvoid duplication of experimentsElectrical testingRadiation resistancePhysics
The invention discloses a method for evaluating the anti-single event effect capability of a SiP device. The steps are as follows: uncap the SiP; obtain the internal chip information of the SiP, and determine whether the anti-radiation performance of the SiP internal device is recorded in the radiation database; The database has the radiation resistance performance data of the corresponding SIP chip, and all SIP chips can meet the anti-single event index requirements, it is considered that the entire SiP meets the anti-single event index requirements; if a SIP internal chip fails to meet the anti-single event index or radiation There is no corresponding radiation performance test data of a certain SIP chip in the database; determine whether there is a chip in a stacked package in the SiP device; determine whether the upper and lower adjacent chips in the stacked package are the same; , separately packaged into a device; conduct a single event effect test on the chip packaged into a device, the same chip with stacking but the same chip, and the chip without stacking, to obtain test data, and judge whether it meets the anti-single event index. The invention solves the problem of inaccurate evaluation of the anti-single event effect capability of SiP devices.
Owner:CHINA ACADEMY OF SPACE TECHNOLOGY

Soil sample maintenance mold for direct shear test of frozen soil

The invention provides a soil sample maintenance mold for direct shear test of frozen soil, and belongs to the field of a frozen soil mechanical test device. The soil sample maintenance mold mainly consists of an outer box, a fastening bolt, side molds, a bottom mold, and a liner plate, and is characterized in that the outer box fixes the side molds, the bottom mold and the liner plate by virtue of the fastening bolt. The two involutory side molds form a hollow cube structure of a cylinder body, and an annular groove is formed on the upper portion of each side mold and used for fixing a cutting ring. When in use, the mold is firstly assembled, and then a soil sample in the cutting ring is pushed into the mold to be maintained by using a soil pusher. By adopting the design, a plurality of soil samples under a same maintenance condition can be maintained together, so that convenience and simplicity can be realized, the sample production efficiency is greatly increased, and the influenceof an error of the maintenance condition on the test accuracy in the maintenance process can be avoided.
Owner:ANHUI UNIV OF SCI & TECH

Tool for adjusting distributed angle encoder of marine low-speed diesel engine and adjusting method

The invention discloses a tool for adjusting a distributed angle encoder of a marine low-speed diesel engine. The tool comprises a tool main body; the tool main body is a cuboid, a tooth groove is formed in the bottom face of the tool main body, and the tooth groove can be clamped with flywheel teeth. A positioning area is arranged on the top face of the tool main body; the Q1 sensor and the Q2 sensor are installed and positioned through the positioning area; and the difference of triggering of the Q1 sensor and triggering of the Q2 sensor is a quarter of a period through the positioning area. The tool is simple in structure, the method is rapid and convenient, the distributed angle encoder is adjusted to directly clamp the tool on teeth, and the sensor is directly installed according to the position, so that the adjustment precision is guaranteed, and the situation that an alarm is given due to the large deviation between the angle A and the angle B of the angle encoder in the later period, and consequently a bullet train is affected is prevented.
Owner:CSSC MARINE POWER

A method and testing device for simultaneously identifying thermal conductivity and heat capacity of materials

The present invention provides a method and testing device for simultaneously identifying the thermal conductivity and heat capacity of a material, the method comprising: measuring the emissivity of the surface of the test material; measuring the heat flux density of the surface of the test material; measuring the temperature history inside the test material; Obtain the thermal physical parameters of the test material; when the thermal physical parameters of the test material are known, use the boundary conditions and initial conditions of the material to calculate the temperature distribution inside the material, and obtain the thermal conductivity and heat capacity of the test material as it changes with temperature.
Owner:HARBIN INST OF TECH

A kit for detecting b-raf gene mutation

The invention relates to a B-raf gene mutation detection kit. The B-raf gene mutation detection kit comprises quality-control primer probe internal-standard mixed liquor and detection primer probe internal-standard mixed liquor, wherein the quality-control primer probe internal-standard mixed liquor comprises a quality-control primer pair, a B-raf gene specific probe, an internal-standard primer pair, an internal-standard specific probe and an internal-standard template, and the detection primer probe internal-standard mixed liquor comprises a B-raf gene V600E mutation detection specific primer pair, a B-raf gene specific probe, an amplification blocking nucleic acid sequence, an internal-standard primer pair, an internal-standard specific probe and an internal-standard template. The B-raf gene mutation detection kit has the advantages that an amplification refractory mutation system is combined with a wild type amplification blocking nucleic acid sequence with a phosphorylated terminal, deoxyinosine is introduced into detection of a B-raf gene V600E mutation detection specific ARMS (amplification refractory mutation system) forward primer to enable quality-control PCR (polymerase chain reaction) and detection PCR to be performed for detection of samples parallelly, and each reaction system can have an internal-standard system capable of effectively avoiding false negative and intra-assay variation; the B-raf gene mutation detection kit is low in cost, high in sensitivity and more capable of controlling intra-assay and inter-assay variation.
Owner:山东国九堂制药集团股份有限公司

Automatic centering device of electro-spindle reliability test bench based on dragging

The invention discloses an automatic centering device for an electric spindle reliability test bed based on dragging and loading. In order to overcome the problem of being unable to monitor the generation of singular data in time, eliminating and adjusting the centering of the test bed is time-consuming and laborious, the device includes a main shaft position adjustment part, The detection part and the monitoring and automatic control part; the detection part includes the support device, the feeding device and the detection device; the main shaft position adjustment part is installed in the middle of the horizontal iron through No. 1 to No. 4 static pressure slides: No. 1 and No. 2 static pressure The pressure sliding table is installed on the left side of the horizontal iron, and the No. 3 and No. 4 static pressure sliding tables are installed on the right side of the horizontal iron; the detection part is installed in the middle of the horizontal iron through the No. 1 and No. 2 support bases, and the supporting device is located on the main shaft On the front and rear sides of the position adjustment part, the feed device is installed on the support device; the No. 1 and No. 2 laser alignment instruments in the detection device are fixed on the fixed plate in the feed device; the monitoring and automatic control part and the spindle position adjustment part , Detection part of the wire connection.
Owner:JILIN UNIV

Prediction method for wide-temperature-range creep strength of nickel-based superalloy

The invention discloses a prediction method for wide-temperature-range creep strength of nickel-based superalloy. The problems that the creep rate and the creep life of the nickel-based superalloy are not accurately predicted under the large-range temperature and stress load are effectively solved. According to a relative position relationship between a central plane of a precipitated phase and a dislocation slippage plane in the nickel-based high-temperature alloy, a probability-dependent creep strength prediction method of a single precipitated phase is provided. Then the size distribution effect of the precipitated phase is considered, and based on the distribution of a creep strengthening mechanism induced by the size distribution effect of the precipitated phase, a statistical dependency creep strength prediction method is proposed. And then the predicted creep strength is substituted into a creep rate calculation method, and compared with the creep rate predicted by classical creep strength, the method can more accurately predict the creep rate under large-range stress and temperature load. According to the method, a large number of repeated tests and waste of manpower, material resources and financial resources are avoided. The time cost is saved, the research and development period of the nickel-based superalloy is shortened, the engineering application reliability of the nickel-based superalloy material is improved, and the scientific research value and the engineering application value are huge.
Owner:HUNAN UNIV

RGBT visual tracking method and system based on two-stage fusion structure search

The invention discloses an RGBT visual tracking method and system based on two-stage fusion structure search, belongs to the technical field of computer vision, and solves the problem of how to find an optimal fusion network structure for RGBT tracking based on robust instance representation so as to further improve the tracking performance. In order to extract shared feature representation having robustness to various challenges such as illumination variation, movement blur and scale variation, a multi-domain learning framework is introduced to search for a fusion network structure in a general fusion space offline. In the online tracking stage, the fusion structure of each video sequence is searched online in the fusion space perceived by the instance so as to cope with challenges specific to the instance; the two-stage search algorithm can dynamically update a video fusion strategy, so that an appropriate fusion network structure is found for RGBT tracking based on robust instance representation, and the tracking performance is further improved.
Owner:ANHUI UNIVERSITY

An Analysis Method for Vibration Induced by Random Turbulence Excitation of Cylindrical Structure

The invention discloses a method for analyzing the vibration induced by random turbulent excitation of a cylindrical structure, comprising: obtaining flow field parameters of fluid distributed on the surface of a cylindrical shell; determining a spatial correlation function of the cylindrical structure; function, calculate the power spectral density of the random turbulent excitation force acting on the surface of the cylindrical structure; obtain the time history of the random turbulent excitation force acting on the surface of the cylindrical structure; convert the time history of the random turbulent excitation force in each discrete area on the surface of the cylindrical structure to the frequency domain; calculate the coherence coefficient between the time-history curves of the random turbulent excitation force corresponding to each discrete area on the surface of the cylindrical structure, and verify the coherence between the time-history of each group of random turbulent excitation forces; The excitation force time history is applied to the cylindrical structure, and the random turbulent excitation-induced vibration response of the cylindrical structure is calculated, which provides a more accurate general method for the calculation of the random turbulent excitation-induced vibration of the cylindrical structure.
Owner:NUCLEAR POWER INSTITUTE OF CHINA

A test method for environmental adaptability of optical fiber sensing system

The invention relates to a test method for the environmental adaptability of an optical fiber sensing system. The test method includes three parts: a hardware connection stage, a test preparation stage and a test stage: the hardware connection stage includes: preparing a temperature and humidity environment test box, and a prototype to be tested , industrial computer, double-layer shielded network cable, power cord and optical fiber disk; the test preparation stage includes: starting the prototype to be tested and the industrial computer and making the network communication between the two normal, and then opening the system control software in the industrial computer to start monitoring the operation of the prototype to be tested status; the test phase includes setting various temperatures and operations and monitoring test results to draw monitoring conclusions. The test method of the present invention selects the most severe working and operating temperature and humidity environment of the product, and allows the product to operate in its extreme environment, thereby providing assistance for device selection and design improvement. During the test, the product is run online and monitored in real time , by comparing the conditions and data before the test, under the high temperature test, under the low temperature test and under the damp heat test.
Owner:BANDWEAVER TECH CO LTD

Cutter abrasion loss monitoring method based on simulation feature and signal feature fusion

The invention relates to a tool wear loss monitoring method based on simulation feature and signal feature fusion, which comprises the following steps: S1, acquiring an original vibration signal, and measuring the wear loss of a rear tool surface; s2, performing signal preprocessing on the original vibration signal and extracting signal features; s3, performing J-C constitutive model parameter calibration of the first-state material based on stretching, compression and Hopkinson pressure bar experiments; s4, performing J-C constitutive model correction of other state materials except the first state material based on the hardness experiment; s5, acquiring simulation characteristics of the same material in different states; s6, performing feature selection and feature dimension reduction on the signal features and the simulation features to obtain fused low-dimension features; s7, training an LSTM (Long Short Term Memory) model according to the dimensionality-reduced features obtained by feeding each time and the corresponding flank abrasion loss; and S8, the abrasion loss of the rear tool face is obtained after the features obtained through each feeding are input. According to the method, the workload of model correction is reduced, repeated experiments are avoided, and meanwhile the precision of the model can be improved.
Owner:FUZHOU UNIV

Annular nugget resistance spot welding numerical simulation method

The invention relates to an annular nugget resistance spot welding numerical simulation method, and belongs to the technical field of welding numerical simulation. According to the actual electrode and workpiece sizes of the annular nugget resistance spot welding process, a CAE model is established in a three-dimensional space by using a solid grid, welding parameters are converted into loads andboundary conditions, an interface is converted into contact attributes, a reliable basis is provided for predicting the nugget size and shape of the annular nugget resistance spot welding process, therefore, reasonable specifications are made for parameters such as the electrode size, the workpiece plate thickness, the welding current, the welding pressure and the welding time in the annular nugget resistance spot welding process. The method has the advantages that a large number of repeated experiments are avoided, errors possibly generated by manual experiments are reduced, the welding stateof the workpiece at different moments can be visually displayed, and a reliable technical means is provided for deeply researching the spot welding mechanism of the annular nugget resistance.
Owner:JILIN UNIV
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