71results about How to "Simplified calculation model" patented technology

The invention relates to a method for quantitatively evaluating orientation degree of short fiber reinforced composite fibers, which is characterized by selecting and determining a sectioning surface and sectioning a composite sample; acquiring a micrograph via an optical microscope or a scanning electron microscope; repainting the elliptic fiber section in the micrograph in graphic image software; extracting the lengths of long axis and short axis and an angle between the elliptic long axis and a coordinate axis in the repainted picture; calculating the direction vectors of the fibers corresponding to the ellipses according to the extracted parameters of the elliptic section; and calculating the parameters of the orientation degree of the composite along a specific direction. According to the method, the proper sectioning surface is selected so as to eliminate the calculation errors caused by condition that the same elliptic section corresponds to two fiber directions. In addition, a calculated mode given by the method considers the probability of sectioning the fibers, and the calculating result is more accurate in comparison with the calculated mode which does not consider the probability of sectioning the fibers.

Said invention refers to concrete gaseous permeability coefficient uniaxial compressive stress tester and testing method belonging to concrete material viability detection technique field. It contains dying, dying sample room, supporting frame, lifting jack, pressurizing plate, compressed gas tank, and pressure gauge etc, wherein dying consisting of dying cover board and dying bottom case, dying sample room located in dying bottom case, dying cover board and dying bottom case respectively set with outgoing gas chamber, intake chamber in turn connected with inlet valve, compressed gas, and pressure gauge, lifting jack and pressurizing respectively located at two ends of test sample, one side of dying bottom case set leakage check groove. In testing, tested sample is located in dying sample room, pressing in wedge, screwing dying, checking leak tightness, starting up lifting jack, applying compressive stress in test sample, opening compressed gas tank valve, keeping tested sample equilibration time being 10-20 minute, each tested sample repeating testing gas permeation time by more than 3-5 times, changing test pressure and repeat testing, to obtain tested sample permeability coefficient average value, taking 3-5 tested sample permeability coefficient average value as test value of said group tested sample. Said invention has easy and simple to handle, reliable test result, assembly type unit, and convenient for carrying.

The invention relates to a power transmission line sag measurement method based on infrared camera image processing. The method comprises the following steps of calibrating a measurement site and an infrared camera; through the infrared camera, acquiring image information near a sag observation point, processing an image and extracting a pixel coordinate of the observation point; acquiring processed image data and calculating so as to obtain a sag of a power transmission line; determining whether the sag of the power transmission line is in a safe range, if the sag of the power transmission line is not in the safe range, sending information to a monitoring terminal, receiving the information and then outputting alarm information by the monitoring terminal; and if the sag of the power transmission line is in the safe range, returning to the step that the infrared camera acquires the image information near the sag observation point. By using the method of the invention, a calculating model is concise and all-weather real-time on-line monitoring can be performed on the power transmission line sag. During establishing a system, less equipment is required, performance is reliable, the structure is simple and cost is low.

The invention discloses a differential type laminar flow rate measuring method and device and belongs to the technical field of flow rate measurement. The measuring device is provided with a measuringpipeline; the measuring pipeline comprises a first laminar flow element, a second laminar flow element, a first differential pressure sensor and a second differential pressure sensor; the length of the first laminar flow element is different from the length of the second laminar flow element; the first differential pressure sensor measures the differential pressure deltaP1 of two sides of the first laminar flow element; the second differential pressure sensor measures the differential pressure deltaP2 of two sides of the second laminar flow element; the first laminar flow element and the second laminar flow element comprise the same number of capillary tubes of the same diameters; the length of the capillary tubes in the first laminar flow element is L1, and the length of the capillary tubes in the second laminar flow element is L2; if L2 is larger than L1, deltaP2 is larger than deltaP1, and a differential pressure difference value deltadeltaP can be obtained according to an equationthat deltadeltaP=deltaP2-deltaP1; if L2 is smaller than L1, deltaP2 is smaller than deltaP1, and the differential pressure difference value deltadeltaP can be obtained according to an equation that deltadeltaP=deltaP1-deltaP2; and the differential pressure difference value deltadeltaP is proportional to volumetric flow flowing through the measuring pipeline. With the method and device adopted, high-accuracy measurement and a larger range can be realized easily.

The invention provides a method and device for measuring rated guide vane water leakage of a water turbine. The method comprises the following steps: determining reference pressure head on the basis of pressure difference between water pressure in a water inlet pipe of the water turbine and water pressure in a tail water pipe when a flat pressing facility of the water turbine is closed; and determining the rated guide vane water leakage of the water turbine on the basis of the reference pressure head, the area of the horizontal cross section of an inclined shaft section of the water inlet pipe of the water turbine or the area of a ventilating hole of the water turbine. According to the method and device for measuring the rated guide vane water leakage of the water turbine, an algorithm is simple, calculating parameters are less, the water leakage of a gate does not need to be measured, and the testing efficiency of a testing field for the rated guide vane water leakage of the water turbine is improved effectively.

The invention discloses an online batched salmon flesh volatility salt base nitrogen detection device and method based on the spectral analysis. The detection device comprises a detection conveying belt used for continuously conveying salmon flesh, a spectrum probe erected above the detection conveying belt and used for collecting spectrum information of the salmon flesh, a host used for receiving the spectrum information from the spectrum probe and conducting comparison on the spectrum information and the preset value so as to obtain a detection result, and a sorting mechanical arm used for sorting the salmon flesh on the detection conveying belt so as to distinguish qualified products and disqualified products according to the detection result. By means of the online batched salmon flesh volatility salt base nitrogen detection device and method based on the spectral analysis, large-batch automation detection of the salmon flesh volatility salt base nitrogen can be achieved, the feature wavelength of the salmon flesh volatility salt base nitrogen can be reflected to the maximum degree through the analysis, the illumination intensity corresponding to a wavelength optical filter is collected, the volatility salt base nitrogen calculation formula is determined through a multivariate linear regression method, spectrum data collection is reduced, a calculation model is simplified, and the purpose of rapid detection is achieved.

The invention discloses a calculation method for stability control of a gravel pile and geogrid combined composite foundation. When the gravel pile and geogrid combined composite foundation conforms to an assumed deep failure mode, the calculation of the stability control of the gravel pile and geogrid combined composite foundation is based on a rigid body limit balance principle; for reinforced soil bodies between gravel piles, a reinforced soil body under an embankment coverage area is equivalent to homogeneous soil according to an area equivalent method, the area except the embankment coverage area is still a soft soil area, and the safety coefficient of the gravel pile and geogrid combined composite foundation is calculated; if the safety coefficient meets the requirements in technicalspecifications, the minimum geogrid ultimate tensile rigidity required by the safety factor is calculated, and the determined design scheme of the gravel pile and geogrid combined composite foundation is more economical and effective. The problem of stability calculation of a traditional gravel pile and geogrid combined composite foundation is solved, and meanwhile the strength parameters of gravel piles and geogrids are reasonably determined.

The invention discloses a method for calculating scattering characteristic of a river ice infrared waveband, and belongs to the field of target and environmental infrared radiation scattering characteristic research. The problems that a scattering model has low calculation accuracy and low practicability in engineering because the fact that the river ice has the characteristics of strong directional scattering and strong scattering radiation brightness is not considered are solved. The method comprises the following steps: dividing BRDF on the surface of river ice into two parts, namely diffusion reflection BRDFdiff and specular reflection BRDFspec, and calculating the diffusion reflection BRDFdiff and the specular reflection BRDFspec separately to obtain the BRDF on the surface of the river ice; according to the BRDF on the surface of the river ice, the wavelength of incident solar radiation, the incident direction and the observation direction, calculating the radiation brightness after the river ice is scattered; and according to the radiation brightness, calculating the scattering radiation brightness after the scattering radiation brightness of the river ice is absorbed by atmosphere through the observation direction. The method is used for calculating the scattering radiation brightness of the river ice under solar radiation exposure during earth observation.

The invention provides an intelligent optimization method and system for multi-robot multi-task cooperative work. The intelligent optimization method provides an intelligent optimization method for multi-robot and multi-task cooperative work by fusing the concept of a task time window. The intelligent optimization method can drive a plurality of robots to complete a plurality of tasks according to an optimal execution scheme, firstly designs a task time and motion time linear approximation method to solve the problem that the time needed by the robots to complete tasks and distances is uncertain, and improves the practicability of the method by combining the concept of a task time window. The intelligent optimization method has the advantages that the model is simple; the efficiency is high, and the multi-robot can efficiently and rapidly decide the optimal task planning scheme to complete multiple tasks in a complex environment.

The invention relates to a data processing method based on clinical test data, belongs to the technical field of clinical test evaluation, and solves the problems that the deviation caused by crowd heterogeneity is not fully eliminated and the data is not fully utilized to improve the inference precision in the prior art. The method comprises the following steps: acquiring data samples of a treatment group and a control group in a clinical test; determining a sample survival estimation model under a potential treatment result based on the data samples of the treatment group and the control group; acquiring a covariable related to a treatment effect in the sample survival estimation model, and calculating according to the sample survival estimation model to obtain potential result estimation of a survival individual under a treatment scheme and the probability that the individual is in a survival state; according to the above-mentioned potential outcome estimates of the surviving individuals under the treatment plan and the probability of the individuals being in a survival state, determining the confidence interval of the average causal effect SACE of the survival group. The confidence interval of the SACE obtained by the method can be used for judging whether a clinical test is effective or not, and the inference conclusion is accurate.

The invention discloses a method for estimating the thermal neutron fluence of a heavy water reactor. According to the method, the structural material of the core of a heavy water reactor is taken outafter neutron irradiation; then the isotope abundance of one or more elements is measured by a nuclear analyzer, because the nuclear material and neutrons (mainly thermal neutrons) carry out radiation capture reactions, the isotope abundances of all elements of the nuclear material change, and thus by measuring the isotope abundances, the thermal neutron fluence on the nuclear material can be estimated under a condition that the running time of the reactor is known. The provided method is simple, and the measurement of thermal neutron fluence is converted into measurement on isotope abundance.

The invention discloses a floating type low-floor tramcar limit calculation method and system, equipment and a medium. The most unfavorable position characteristic of a vehicle is determined by analyzing the hinging mode between modules, and the limit calculation of the vehicle on a line is divided into the limit calculation on a line straight section and the limit calculation on a line curve section, so that an engineering construction side can carry out construction according to different line conditions; the limit calculation of the straight line section of the line is divided into a vehicle body part and a bogie part, factors considered for the limit calculation of the vehicle body part and the bogie part are different, and the calculation accuracy is improved through the two parts; for the vehicle body part, a calculation model of the X-direction offset of the vehicle body is established by taking a single module and the whole vehicle as research objects, and a calculation model of the Y-direction offset of the vehicle body is established by taking a rigid body module as a research object, so that the calculation model is simpler, and the calculation result is more accurate; and only head and tail end modules and a middle module are calculated for limit calculation of a line curve section, and a calculation model is simplified.

The invention relates to an ultrahigh-precision multilayer film thickness drift error calibration method, which comprises the steps of of alternately moving a substrate to a sputtering region of two target materials for plating a multilayer film, and plating a first periodic multilayer film; enabling the substrate to be far away from the sputtering region, continuing sputtering the target materials, and simulating the plating process of the target periodic multilayer film; alternately moving the substrate plated with the first periodic multilayer film to the sputtering region again, and plating a second periodic multilayer film to form a calibration sample; and performing an X-ray grazing incidence reflection test on the plated calibration sample under fixed X-ray energy to obtain a test reflectivity curve, and obtaining a multilayer film drift error from the beginning to the end based on comparison between the test reflectivity curve and the simulated reflectivity curve, wherein the number of film pairs of the first periodic multilayer film and the second periodic multilayer film is 1/10-1/5 of the number of film pairs of the target periodic multilayer film. Compared with the prior art, the method has the advantages of high precision, small influence of instrument conditions and the like.

The invention discloses a temperature field simulation calculation method suitable for a doubly-fed motor brush slip ring system. The method comprises the following steps: establishing a 3D model of the brush slip ring system; meshing the 3D model according to the component distribution of the brush slip ring; acquiring material parameters, current magnitude, applied current load and boundary conditions of the brush slip ring; obtaining a heat generation rate and a convective heat transfer coefficient of the electric brush slip ring; and according to the 3D model after grid division, the material parameters, the current magnitude, the applied current load, the boundary condition, the heat generation rate and the convective heat transfer coefficient, performing simulation to obtain a temperature field of the electric brush slip ring. The temperature field condition of the electric brush slip ring under the working condition is accurately simulated by combining the working condition of the electric brush slip ring and utilizing knowledge related to electricity and thermodynamics, theoretical support is provided for temperature detection of an electric brush slip ring system, and technical support can also be provided for subsequent fault diagnosis of the electric brush slip ring.

The invention discloses a method for quickly optimizing plane parameters of an aircraft wing. The method comprises the following steps: 1, generating a wing configuration sample; 2, setting wing constraint conditions; step 3, screening aircraft configurations; 4, determining an optimization strategy and establishing a configuration optimization calculation model; 5, selecting an optimization target parameter; and 6) optimizing wing configuration. According to the method, a flight performance index serves as the final optimization target, a hierarchical optimization strategy is adopted, the calculation model is simplified, the calculation method is reasonably selected, the optimization efficiency is effectively improved, the optimization period is shortened, and the problems of cross-professional optimization, high optimization resource requirement and low optimization efficiency of a traditional optimization method are solved.

The invention discloses a calculation method for directly measuring the loss amount of the coal seam methane content. In order to solve the problem of inaccurate measurement of the coal seam methane content, a coal sample technology, a coal seam methane adsorption and desorption rule and a coal seam sampling form are adopted, and a least square method is adopted for directly measuring the loss amount of the coal seam methane content. According to the calculation method, the calculation model is simple, and the measurement result precision is greatly improved.