30results about How to "The test method is practical" patented technology

The invention discloses a method applied to evaluation of flow conductivity of shale-gas-combined sand fracturing fracture. The method comprises the following steps: a, simulating a sand bar transporting process in shale-gas-slickwater-combined sand fracturing fracture by means of an experiment device for simulating flowing of proppants in a visual fracture net to obtain sand bar transporting video of the combined sand fracturing fracture under different experiment conditions; b, obtaining a distribution curve of the proppants with different particle diameters by virtue of a gray processing method and a point-by-point scanning method and obtaining distribution shape function of the proppants with different particle diameters by virtue of a linear regression method; c, building the sand bar distribution shape function of an API flow guide chamber by utilizing geometric similarity principle according to the size of the API flow guide chamber, paving shapes of the corresponding proppants and implementing evaluation of flow conductivity of shale-gas-combined sand fracturing fracture. The method is capable of simply and accurately implementing quantitative evaluation of the flow conductivity of shale-gas-combined sand fracturing fracture; experiment support is provided for optimizing the combined sand fracturing design and improving the flow conductivity of the shale fracturing fracture.

The invention discloses a frequency domain method for identifying rotor side controller parameters of a double-fed wind turbine generator. The frequency domain method includes: firstly, determining d-axis and q-axis decoupling models and the parameters to be identified on a rotor side controller; then injecting pseudo random signals to reference signals of the rotor side controller; calculating autopower spectrum of input signals and cross-power spectrum of the input signals and output signals according to the inputted pseudo random signals and outputted rotor current d-axis or q-axis weight which are acquired synchronously, and acquiring a frequency sequence of transfer function of the rotor side controller decoupling models; finally, identifying parameters on the rotor side controller on the basis of damping nonlinear least square optimization method. The experimental method is simple by identifying the rotor side controller parameters on the basis of the decoupling models; the pseudo random signals are superimposed on the inputted reference signals as excitement without affecting normal work of the double-fed wind turbine generator, and the experimental method is practical.

The invention provides a method for building a crude oil property rapid prediction model by use of a reflecting near infrared fiber probe and application of the method. The method comprises the following steps: building a crude oil calibration set, and measuring, calibrating and concentrating properties of crude oil; acquiring a near infrared spectrum of crude oil by use of the reflecting fiber probe; pre-treating the near infrared spectrum of crude oil, obtained in the step II, by use of a first-order differential method; selecting a training set sample for pre-treated spectral data by use ofa principal component analysis method; according to the to-be-measured properties of crude oil and a crude oil spectral data set, selecting a specific spectral band; and building a mathematical correlation model between the properties of crude oil and the near infrared spectral data by use of the partial least square method. During on-line application of the method, complicated sample pretreatment is not needed, and the characteristics that the operation is simple, the signal-to-noise ratio of the near infrared spectrum is high, and the precision of the quantitative analysis model is high areachieved. Through selecting a near infrared instrument and the reflecting near infrared fiber probe of which the models are appropriate, on-line/off-line rapid analysis on the properties of crude oilcan be finished.

The invention discloses a method for quickly testing weathering resistance of polypropylene fiber for a net cage or fishing gear, and relates to the test of the weathering resistance of the polypropylene fiber. Aiming at shortening the test time, the method comprises sampling, exposing condition, weathering resistance test, conditioning balance, test box, fiber crystallinity and test of stretching property, and is characterized in that: a sample is selected 40m away from the tail end of fiber; a test program is made under exposing conditions of 4-hour irradiation at a black standard temperature of 63 DEG C and 2-hour condensation at a black standard temperature of 51 DEG C; the sample undergoes conditioning balance at a temperature of between 15 and 21 DEG C and a humidity of between 50 and 70 percent; fluorescent UV lights of the test box are arranged in two lines, and each line includes 4 lights; and the sample undergoes the DSC test by a differential scanning calorimeter to measure the melting heat contents of the sample before and after the test of the weathering resistance, and the crystallinity of the sample is worked out; the sample is stretched at a stretching speed of 360 mm/min until broken, and the line density and the stretching strength of the sample are also measured. The method is used for quickly testing the weathering resistance of the polypropylene fiber for fishing.

The invention relates to a method for constructing an agent model of a steady-state simulation result of a sewage treatment dynamic model by utilizing a Kriging interpolation method. According to themethod, after the input variable of the sample is measured, the output value of the steady-state simulation result can be accurately predicted. The method comprises the following steps: 1) setting a sampling strategy and obtaining a training sample and a prediction sample; 2) performing steady-state simulation according to the sewage treatment dynamic model, and recording a result; 3) fitting thetraining sample according to a Kriging interpolation method optimized by a PSO algorithm, and generating a prediction value for verifying steady-state output of the sample; and 4) comparing the difference between the predicted value and the real value, and increasing the number of the training samples to repeat the above operations when the difference is greater than a set threshold. According tothe method, the agent model can be adaptively established according to the to-be-tested sample, and when the real input sample is collected, the result of steady-state simulation can be accurately andquickly predicted, and the calculation amount is greatly reduced.

The invention relates to a method for measuring dust concentration at an inlet of a dust remover. The method comprises a method for measuring the dust concentration at the inlet of the dust remover under medium-low load; a method for correcting the result of the dust concentration at the inlet of the dust remover measured by the high load to the dust concentration at the inlet of the dust removerunder the low load; and a simplified method for correcting the dust concentration result of the inlet of the dust remover measured by the high load to the dust concentration of the inlet of the dust remover under the low load. The calculation method creatively provides a method capable of carrying out a test under medium and low loads and calculating the dust concentration at the inlet of the dustremover according to the material balance and ash balance principle in the raw coal combustion process of the power station boiler.

The invention relates to a method for testing residual sugars in sucrose series of polyether polyols, and belongs to the technical field of rigid foam polyether polyols. The testing method comprises the following steps: 1, at room temperature, adding alkane in polyether polyols, and fully performing stirring in ice water bath; and 2, ensuring that the solution is turbid and is not transparent after stirring is completely carried out, and standing and then observing precipitation conditions of crystal grains. The testing method provided by the invention has the advantages of scientificity and reasonability, simplicity and feasibility, and moreover, whether sucrose is remained in a polyether product can be effectively detected, so that an adverse effect on downstream application caused by unqualified products is eliminated.

The invention discloses a heating element mechanical strength testing device . The device comprises a fixed arm (1), a fixed base (2), a hand-cranking device (3), a punch (4), a heating element supporting seat (5), a connecting seat (6), a transmission box (7) and a movable box (10). The invention further discloses a using method of the testing device. According to the testing device, the fixing grooves can be formed in a targeted mode according to different shapes of the heating elements, and various testing shapes and types are achieved. The testing method of the testing device is simple andpractical, and the obtained mechanical strength data is accurate and reliable.