8 results about "Theoretical research" patented technology

The invention discloses a terahertz water channel modeling method based on an improved integral equation model, and the method comprises the following steps: S1, obtaining simulation parameters, carrying out the initialization, determining a complex dielectric constant, and carrying out the dual-scale modeling; s2, determining a height value and a local slope of each sampling point; s3, determining a shielding state of the sampling point; s4, correcting a dynamic roughness parameter of the dual-scale modeling; s5, coordinate transformation is carried out, and the reflectivity of the sampling points under the global coordinate system is obtained; and S6, determining the global vertical polarization reflectivity and the global horizontal polarization reflectivity, and drawing a curve for visual display. The method is not only suitable for theoretical research and simulation analysis, but also can provide key channel characteristic reference for design, optimization and deployment of a terahertz communication system, and has important scientific research value and engineering application prospect.

This invention relates to a calculation method for droplet condensation on a smooth surface. Condensation experiments are conducted on surfaces with different wettability. A mathematical model is established to show the dependence of the condensation rate on surface wettability. Calculation assumptions are established to obtain the relationship between the volume change of a single droplet and the change in the droplet radius within a region. A condensation system is established to track changes in condensed droplet parameters and parameter changes after droplet merging. Results are output based on the condensation system and compared with actual implementation data for verification. The beneficial effects are: this invention studies the change in relative humidity after condensation stabilization, obtaining numerical simulation results that agree well with experimental results. It can effectively predict the changes in the state parameters of condensed droplets during condensation. This numerical simulation scheme facilitates the design of condensation systems for air conditioners, electric vehicles, etc., and saves experimental costs in theoretical research.

The invention discloses a natural gas well productivity prediction and well test analysis method and system, and belongs to the technical field of natural gas related basic theory research. The method is based on related theories of mathematical physical equations and combines seepage characteristics of real gas in a porous medium in a natural gas well; according to the method, a natural gas nonlinear unstable seepage partial differential equation is established, a dimensionless transformation function of pressure, time and position defined based on a differential quotient is introduced, an analytical solution of the nonlinear seepage equation considering the turbulence effect is obtained, the productivity of a natural gas well is predicted, well testing data is analyzed, and well testing model calculation shows that the yield of the natural gas well is greatly improved. After the inertia-turbulence effect is considered, the bottom hole pressure is lower; the calculation of a fixed bottom hole flowing pressure model shows that the gas well yield is reduced after the inertia-turbulence effect is considered; compared with an existing method, the result has the advantages that errors are reduced, the precision is higher, and a certain theoretical basis can be provided for further researching the problem of unstable seepage of the complex heterogeneous oil and gas reservoir.

The application discloses a large mold cavity degradation and forging quality deviation prediction method under extreme working conditions, and specifically comprises the following steps: step 1, constructing a stress and forging forming coupling analysis model of the large mold under extreme service working condition; step 2, obtaining the change rule of each field quantity in a single cycle service of the large mold under extreme working condition; step 3, establishing a multi-cycle automatic expansion finite element analysis model; step 4, analyzing the service cumulative deformation, wear, damage and cavity shape degradation rule of the mold in multiple cycles; step 5, obtaining the influence rule of the mold degradation on the forging size deviation and calibrating the model. The application can effectively guide the design optimization and service maintenance of the large mold, prolong the service life of the large mold, improve the production precision and stability of the forgings, and is suitable for the service performance prediction of the large mold in the fields of aviation, aerospace and high-end equipment manufacturing, and has important engineering application value and theoretical research significance.

The application discloses a kind of extreme working condition under large mould profile size precision initiative compensation predecision-making method, the extreme working condition is: temperature range is 700 ℃-1200 ℃, forming load is 500MN-800MN;Specifically includes the following steps: step 1, constructs the large mould factor trace mechanism of forging geometric size target deviation;Step 2, degradation prediction input stage;Step 3, compensation amount calculation generation stage;Step 4, construct neural network proxy model.The application realizes the prospective prediction of mould cavity degradation and forging size deviation before forging production and profile compensation predecision-making, can effectively guide the design optimization, service maintenance and profile compensation planning of large mould, significantly improve forging production precision and stability, reduce mould failure and forging scrap risk, applicable to aerospace, high-end equipment manufacturing and other fields under extreme service working condition Large mould application, with important engineering application value and theoretical research significance.

The application discloses a kind of construction methods of multi-section combined mining horizontal pillar critical thickness optimization calculation model, belong to mining process technical field.The method is analyzed by the mechanical state where horizontal pillar is located, based on Mindlin medium thick plate theory, under the boundary condition of four edges fixed support, under the action of multi-stress field of upper uniform load, self gravity, two-way horizontal stress, the bottom surface is in the state of open space, the mechanical model of horizontal pillar;Finite fourier integral transformation method is used to solve and analyze the mechanical model of horizontal pillar, the internal force distribution law of horizontal pillar is obtained, based on maximum tensile stress criterion, the critical thickness optimization model of horizontal pillar is constructed, the mechanical action of horizontal pillar is clarified, the critical thickness optimization model of horizontal pillar constructed has important theoretical research significance and higher popularization and application value for accurately determining the critical thickness of horizontal pillar in mine, ensure the safety of multi-section combined mining.

The invention discloses a multi-structure comparison pile pushing test method for a large-section circular anti-slide pile, and belongs to the technical field of geotechnical engineering model tests. The method comprises the following steps: a model preparation stage: designing and preparing a model pile and a slope body material based on a strict similarity theory, and installing an autonomous friction resistance reducing system; in the accumulation test stage, a single-row pile test, a multi-type pile comparison test, a double-row pile test and a portal pile test are sequentially conducted on the same slope body model, and the structure is changed from simple to complex; in the decline test stage, a single-row cantilever pile test and a side friction resistance test are conducted in sequence, and the structure is simplified. According to the invention, through the closed-loop test logic of accumulation-decline, systematic comparison of various slide-resistant pile structural forms is realized on one set of model, the test efficiency is high, and the data comparability is strong; systematic similar design is integrated, the friction resistance reduction and test technology is innovated, the test precision and authenticity are effectively improved, and a comprehensive and reliable test means is provided for design optimization and theoretical research of the large-section circular anti-slide pile.

The present application belongs to the technical field of machine answering, and particularly relates to a question understanding method for machine answering. The present application firstly realizes feature extraction and unified semantic expression of single-mode / multi-mode data through a feature embedding module, an encoder and a contrast learning module, then defines direct statement relations and implied relations, extracts direct statement relations directly shown in the question in the question understanding process to realize fusion understanding of data, and reasons out implied relations required for answering the question, thereby laying a foundation for automatic solution of the question. The present application establishes a basic theory of machine answering, breaks through key technologies of machine answering, is very crucial for expanding a problem solving range and improving problem solving quality, has important theoretical research significance, academic research value and broad application prospect, and meets application services of machine answering.