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

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.