58results about How to "Reduce test volume" patented technology

The invention relates to an air gap breakdown voltage prediction method. The method is characterized by selecting several typical electrode structure air gaps and determining a factor and a level range which influence a breakdown voltage; selecting an orthogonal table which can be used to inspect each level of the above factor and successively carrying out breakdown voltage tests according to a test condition corresponding to each test number; loading a breakdown voltage test value so as to carry out electrostatic field calculation on the typical electrode structure air gaps and extracting an electric field distribution parameter from a calculation result; using a support vector machine to establish a breakdown voltage prediction model, taking the electric field distribution parameter as an input of a model, taking whether the gap is in a breakdown state under a loading voltage as an output of the model, using typical electrode structure air gap breakdown voltage test data to train a support vector machine model so that an air gap breakdown voltage of another electrode structure is predicted and obtained. By using the method in the invention, a prediction process is simple; accuracy is high; a test quantity needed by air gap discharge characteristic research can be decreased and test cost is reduced.

The invention provides a permanent magnet temperature on-line detection method and device which are applied to a permanent magnet motor. The permanent magnet temperature on-line detection method comprises the steps that the rotating speed and the counter electromotive force of the permanent magnet motor are acquired; the temperature value of a permanent magnet is obtained through calculation according to a preset temperature calculating rule, the rotating speed and the counter electromotive force, and the preset temperature calculating rule represents the corresponding relation of the rotating speed, the counter electromotive force and the temperature value of the permanent magnet. In the detection process, only the rotating speed and the counter electromotive force of the permanent magnet motor need to be acquired and calculated, the temperature of the permanent magnet can be directly obtained, the measuring method is simple, the testing amount is small, and the testing time is short. Moreover, due to the fact that high-cost devices such as a thermal infrared imager do not need to be used, and the testing cost is lowered. In the measuring process, constant temperature maintaining of cooling liquid of the motor is not involved, and operation is easy. In addition, the permanent magnet temperature on-line detection device is achieved in practical, and the measuring structure is simple.

The invention discloses a solid propellant formulation energy optimization design method based on a genetic algorithm. The method comprises a first step of modeling, and building an energy characteristic calculation model of solid propellant according to a minimum free energy principle; a second step of setting and storing initial parameters, inputting component species used by the solid propellant, and a chemical formula and a quality proportion range of each component, and inputting species of combustion products produced by the solid propellant after being combusted, and chemical formulas and relative molecular mass of all the combustion products or selecting all the combustion products in a combustion product data base; and a third step of calling a genetic algorithm module by a data processor, and conducting optimization design to quality proportion of the designed solid propellant. The solid propellant formulation energy optimization design method based on the genetic algorithm is simple in steps, reasonable in design, convenient to achieve, good in using effect, capable of fast obtaining an optimum proportion of highest specific impulse of the solid propellant and effectively overcoming the defects, existing in an existing solid propellant compound design process, of being high in energy characteristic test cost, long in period, large in test dose, and the like.

The invention provides a multi-nozzle solid attitude control engine blocking cover structure. The blocking cover is mainly composed of a spraying pipe clamping ring, a piston and sealing rings, the control device for opening the opening pressure design value of a spray pipe plug cover is mainly used for changing machining materials of the piston, geometrical parameters and structural forms; and according to the selected machining materials, the geometrical parameters and the structural form of the piston, the opening pressure of the novel spray pipe plug cover can be predicted through structural calculation. Meanwhile, the spray pipe plug cover can solve the problems that a small-size conventional spray pipe plug cover used for a special spray pipe is difficult to machine and the discretedegree of the opening pressure is large. The connection mode of the spray pipe plug cover and a spray pipe assembly can be selected but not limited to threaded connection, pin connection and clampingkey connection mode. According to the multi-nozzle solid attitude control engine blocking cover structure, the accurate control of the opening pressure of the nozzle cover of the spray pipe is realized by means of the mature structure calculation, the test amount is reduced, the product performance reliability is improved, and the design cost is saved.

The invention discloses an intelligent sliding bearing capable of adjusting the viscosity of lubricating fluid automatically and a control method thereof, which belong to the technical field of mechanical design and automatic control. The bearing comprises a bearing inner bush (7), a bearing outer bush (3), a coil (4) arranged between the bearing outer bush (3) and the bearing inner bush (7), an external force sensor and a rotation speed sensor, wherein the each of the left and right ends of the bearing inner bush and the bearing outer bush is provided with a pair of pole shoes (1), and an annular magnet (2) is arranged between each pair of pole shoes; and a sealing structure is arranged between the annular magnet (2) and the pole shoes (1) and a rotating shaft (6) and keeps magnetic fluid (5) between the rotating shaft (6) and the bearing inner bush (7). The bearing and the control method thereof can adjust the viscosity of the lubricating fluid automatically according to working conditions, so that the bearing can be kept in a well lubricated state and friction power consumption and wear are reduced.

The invention provides an automobile drive axle vibration simulation analysis method. The method comprises the following steps: 1) establishing a main speed reducer transmission model of an automobiledrive axle through transmission analysis software; 2) extracting positioning size information of a bearing center point of a main speed reducer; 3) establishing a shell finite element model of a drive axle shell through finite element software; 4) generating a mass and rigidity matrix of a bearing center point; 5) importing the mass and rigidity matrix of the central point of a bearing into transmission analysis software; 6) outputting dynamic displacement information of the bearing center point under different working conditions; 7) calculating the shell vibration response under the bearingload. Finite element software and professional transmission analysis software are combined, the test amount is reduced, the test period is shortened, a simulation model is used for optimizing and improving the drive axle, the improvement effect is checked before formal improvement and implementation, and the production cost of enterprises is saved.

The invention discloses an oil-paper insulation system breakdown voltage prediction method based on a support vector machine. The oil-paper insulation system breakdown voltage prediction method comprises the steps of: (1) selecting a typical oil-paper insulation structure in a transformer, and forming an influence factor execution table; (2) conducting a breakdown voltage experiment according to the influence factor execution table, and recording breakdown voltage experimental data; (3) establishing an SVM regression prediction model; (4) separating a to-be-predicted oil-paper insulation system to establish an equivalent circuit model of each insulation structure; (5) calculating a breakdown voltage of each insulation structure by utilizing the SVM regression prediction model; (6) and comparing the breakdown voltage with a withstand voltage of the equivalent circuit model of each insulation structure to obtain a predicted breakdown voltage of the oil-paper insulation system. The oil-paper insulation system breakdown voltage prediction method utilizes the support vector machine to perform prediction analysis on the oil-paper insulation breakdown voltage, is simple and efficient, is conductive to solving the uncertainty in transformer oil-paper insulation analysis, reduces the amount of oil clearance breakdown tests in transformer oil and electrical feature study, and reduces test cost.

The invention discloses a method for inspecting a simulation result and determining the state thereof in a simulation system. The method comprises the following steps: the simulation result is inspected first, if a formula that F is equal to that (SA/m)/(SE/(n-m)) is equal to or more than F alpha (m, n-m) is established, the simulation result is not correct; otherwise, the simulation result is correct; when the simulation result is not correct, the simulation result requires further state determination. If a formula that Fi is equal to that (ni Y<i.><2>/1)/(SE/(n-m)) is equal to or more than F alpha (1, n-m) is established under a certain state, a simulation result under the state is not correct; otherwise, the simulation result under the state is correct. Therefore, after the state of simulation error is found, the state of simulation can be modified without modifying the whole simulation system. The method requires small tested number with high inspection accuracy, and can directly establish and modify the simulation system under small sample conditions. Furthermore, in order to lead the method of the invention to be more convenient for engineering application, the invention also establishes a simulation result inspection table and a simulation result state determination table, therefore, small sample inspection and state determination of the simulation result in the simulation system can be completed by filling out the tables.

The invention discloses an efficient cyfluthrin nano-emulsion composition and a preparation method thereof. The efficient cyfluthrin nano-emulsion composition is prepared from, by mass, a surfactant 6.6-10%, an oil phase 10-20%, efficient cyfluthrin 2.5%, eistilled water 70%-82%, wherein the total mass percentage is 100%. The obtained efficient cyfluthrin nano-emulsion composition has the advantages that the stability is good, the organic solvent consumption is low, and the composition is easy to operate and use in agricultural production and the like. The particle size of pharmaceutical liquid is 69-150 nm. The polydispersity index (PDI) is 0.15-0.048. By adopting a single factor method and a triangular coordinate diagram method and using the emulsion particle size, the polydispersity index (PDI) and water removing stability as evaluation indexes, the test quantity is reduced, and the test efficiency is improved.

The invention relates to a method for realizing fine analysis of an iron ore sintering simulation test through process pause. In the test process of a sample material before the sample material is fired, stage slitting of the process is realized through different process conditions, so that the sintering process is paused at a certain stage and qualitative analysis is performed for the stage; anda final sintering scheme is analyzed and adjusted according to process parameters and intermediate results of various stages. The invention provides a refined analysis means for adjusting a batching and sintering scheme of a sintering simulation test, which reduces the ineffective test quantity, provides an unprecedented process parameter for the result of a sintered finished product, realizes thevisualization of important process parameters, and provides a stronger support for the sintering theory and practice.

The invention relates to a material performance testing method and a testing tool. The method comprises the following steps: determining design parameters of a die according to the performance of a material, the design parameters comprising the number of channels, n being a positive integer greater than or equal to 3, and the air pressure of each channel being independently controlled; machining amold according to the design parameters; and putting the material into a mold, and testing the superplastic forming performance/diffusion bonding performance. The material performance testing methodaims to solve the problems of large test quantity, long period, large energy consumption and high development cost of superplastic forming/diffusion bonding performance test.

The invention discloses a porous concrete aggregate design method based on working performance, which comprises the following steps: determining the pore, slurry and aggregate volume of concrete according to the design density, porosity, U-shaped slump and other working performance of target porous concrete, thereby determining the particle size combination of the aggregate and the mass of the aggregate required by unit volume of porous concrete. According to the method, mix proportion design is carried out based on the working performance of the porous concrete, and the problems that the porous concrete design and actual working performance are greatly different, and construction is difficult are solved.

At present, it is unable to carry out evaluating full line on-line optimization test (i.e. quality evaluation of full line working procedure) since various working procedures and parameters causes huge test quality. In earlier stage, using factor filtration to carry out quality evaluations of single working procedure or multiple working procedures, the disclosed method possesses advantages of small test quantity, and small data quantity, and easy of determination and evaluation. The method includes procedures: carrying out factor filtration test for single working procedure or multiple working procedures from theoretical research on test design and data analysis; using variance analysis to find out few key factors of playing decisive effect on test indexes; designing full line on-line optimization test based on the said few key factors.

The invention discloses an aviation piston two-stroke engine supercharging system design method, and belongs to the technical field of aviation piston two-stroke engine supercharging system design. The method comprises the steps that basic parameters and performance strengthening target parameters of the aviation piston two-stroke engine are determined; selecting and matching a supercharger and preliminarily designing structural parameters of a resonant tube; determining common working condition parameters of the aviation piston two-stroke engine and a use weighted value of each working condition; optimizing structure parameters of the resonant tube through a genetic algorithm, and determining control target parameters; and according to a supercharger and the optimized resonance tube, a supercharging system is machined and assembled for the aviation piston two-stroke engine, and test verification is carried out. The design method of the aviation piston two-stroke engine supercharging system is suitable for an aircraft with high lift limit, high maximum level flight speed and long endurance, high comprehensive performance under all working conditions is considered, the design period is short, and the trial-manufacturing cost is low.

The invention relates to a method for rapidly detecting the activity of a CDK9/CyclinT1 enzyme and application of the method. According to the detecting method, the principle that the CDK9/CyclinT1 enzyme can phosphorylate a substrate at the molecular level is utilized in combination with an ADP-Glo technology which has very high sensitivity, and then the amount of ATP consumed in a reaction is directly determined to quantify the process of the reaction. The whole reaction can be operated under a common laboratory condition, isotopic laboratory conditions are not needed, radiation hazards possibly caused to operating personnel and environments are reduced, and the safety is high. In the meanwhile, the method is simple and feasible, all experiments of the whole reaction can be completed byoperation within one day, the detection time is greatly shortened, the data volume of single-time detection can also be increased, and the method is more suitable for vast compound activity evaluationexperiments. Therefore, the method can be applied to screening of CDK9/CyclinT1 enzyme receptor inhibitors and screening of anti-tumor drugs relevant to target spots.