16 results about "Superposition method" patented technology

The application discloses a kind of arbitrary pulsating wind field active control wind tunnel physical simulation method and system, comprising: establishing generalized pulsating wind field spectrum model, it has 6 controllable pulsating wind spectrum in the energy distribution model parameter of frequency domain;Based on generalized pulsating wind field spectrum model, inter-spectrum matrix is calculated using coherence function;Based on harmonic superposition method, inter-spectrum matrix is converted into pulsating wind field space-time information;Pulsating wind field space-time information is introduced into the control program of active control wind tunnel, through real-time monitoring and iterative adjustment model parameter, until the target wind field generated reaches expectation.The application can simulate wind field with arbitrary frequency energy distribution by generalized pulsating wind field spectrum model with 6 model parameters, combined with iterative closed-loop control, significantly improve the simulation accuracy and adaptability of complex wind field such as mountain valley wind, typhoon.

This invention relates to a data processing method and storage medium for ice-elastic plate compression tests in the field of ship structural mechanics. The method includes the following steps: performing a compression test by compressing an ice sample with an elastic plate; after the compression test, obtaining the test pressure value and strain gauge test values ​​of the ice sample under compression; selecting a preset order mode shape using the modal superposition method to obtain a fitted deflection function; determining the fitted strain value corresponding to each test point of the elastic plate based on the fitted deflection function; calculating the time coefficient by combining the strain gauge test values ​​and the fitted strain values ​​using the least squares method to obtain the fitted deflection distribution function of the elastic plate; and calculating the compression energy of the elastic plate and the ice sample based on the fitted deflection distribution function and the test pressure value. This method focuses on the deformation of the elastic plate to explore the interaction between ice and the structure from an energy perspective, considering the feedback influence of structural deformation on the action process, thus forming a universal method for predicting ice loads.

The application discloses a kind of open-pit mining mine annual resource quantity monitoring method and system, it is related to mine resource monitoring technical field, the method includes: obtaining multi-source remote sensing data, and the multi-source remote sensing data is carried out data screening and control point correction preprocessing, obtain the multi-source remote sensing data after preprocessing;Based on the multi-source remote sensing data after preprocessing, DEM extraction, DEM normalization and 3D butt joint ore body processing are carried out, obtain the butt joint three-dimensional ore body model;According to the butt joint three-dimensional ore body model, the earthwork of open-pit mining area is calculated;Based on the earthwork, the annual resource quantity of open-pit mine is calculated;Based on the annual resource quantity of open-pit mine, using vector and raster superposition method, annual resource quantity monitoring result map of open-pit mine is generated.The application can improve the precision and efficiency of mine annual resource quantity monitoring.

The application discloses an industrial pipeline flow velocity measurement method based on a differential array and an MVDR algorithm, wherein step 1 is that fluid flow signals in a pipeline are collected through a multi-sensor array distributed on the outer wall of the pipeline, and adjacent channel differential preprocessing is carried out to suppress common-mode noise; step 2 is that a frequency domain signal is constructed by using STFT, a time recursive smoothing mechanism is adopted to update a covariance matrix, and dynamic adaptability is enhanced; step 3 is that an improved MVDR algorithm is used to calculate a wave number-frequency (k-f) spectrum diagram in combination with adaptive diagonal loading and SVD regularization technology; step 4 is that background noise suppression and energy enhancement processing are carried out on the k-f two-dimensional power spectrum diagram, and effective turbulent flow characteristics are highlighted; and step 5 is that high-precision real-time measurement of fluid flow velocity is realized through a tilt superposition method in combination with a spline interpolation fine search strategy. The application effectively solves the problems of inaccurate covariance matrix estimation and difficult feature extraction under low signal-to-noise ratio in complex working conditions.

The application discloses a kind of non-stationary wind field high-efficiency simulation method based on dynamic interpolation setting point strategy, including determining simulation point number and its space position;According to the time-varying fluctuation power spectrum model of typhoon, the evolution power spectrum density matrix is calculated;Determine the time range and frequency range of simulation, and it is evenly dispersed into P and Q nodes on time axis and frequency axis respectively;In these discrete nodes, the interpolation node coordinates are selected by dynamic interpolation setting point strategy;By Cholesky decomposition to the evolution power spectrum at interpolation node, the spectral decomposition matrix at the place is obtained, then combined with interpolation method, the spectral decomposition matrix at non-interpolation node is obtained;According to the formula of harmonic superposition method, generate fluctuating wind speed sample.The application is based on classical harmonic superposition method, constructs a kind of dynamic interpolation setting point strategy, can accurately, conveniently select the interpolation node of frequency dimension, effectively reduces the amount of calculation, significantly improves simulation efficiency.

This invention discloses a multi-level mapping method for characterizing machine tool accuracy degradation and optimizing its key parameters, belonging to the field of machine tool accuracy retention technology. This method constructs a complete technical framework of forward modeling and prediction followed by reverse parameter optimization, achieving quantitative prediction and proactive control of machine tool accuracy retention throughout its entire lifecycle through four-level mapping. First, based on the small displacement screw method and multibody system theory, a whole-machine spatial accuracy model considering geometric errors at large assembly interfaces is constructed. Second, combining numerical simulation, the Arcard wear model, and the superposition method, a time-varying degradation model of guideway straightness under multi-physics coupling is established. Third, by integrating the straightness and perpendicularity degradation laws, a time-varying equation for whole-machine spatial accuracy is derived, clarifying the mapping relationship of multi-level time-varying factors. Finally, using the accuracy degradation rate as an evaluation index, the machining and assembly process parameters are optimized through reverse derivation, forming a closed-loop optimization system. This invention is of great significance for improving the accuracy retention of high-end CNC machine tools.

This invention belongs to the field of reservoir parameter calculation technology, and particularly relates to a method for calculating reservoir permeability using a three-factor superposition method. Within a preset stratum depth range: well logging interpretation porosity is calculated; a basic core permeability model is constructed to obtain conventional permeability; the median permeability layer after normalization of the spontaneous potential curve is determined, and a spontaneous potential correction coefficient is calculated using the ratio method; the median permeability layer after normalization of the density curve is determined, and a density correction coefficient is calculated using the ratio method; the maximum and minimum values ​​of the array induced resistivity curve after normalization are obtained; the resistivity difference coefficient is calculated; the resistivity correction coefficient is calculated based on the resistivity difference coefficient; a permeability correction coefficient is calculated based on the spontaneous potential correction coefficient, density correction coefficient, and resistivity correction coefficient; and the corrected permeability, calculated using the three-factor superposition method, is obtained based on the permeability correction coefficient and the conventional permeability. This method solves the problem of large discrepancies between well logging calculation results and core analysis in heterogeneous reservoirs.

This application provides a model building method, evaluation method, and system for power grid time-series stability assessment with high accuracy and strong interpretability. The model building method includes: initializing an Informer encoder; initializing a multivariate decision tree improved model; acquiring multidimensional time-series data after power grid disturbances and simultaneous system static feature data, processing them separately to obtain fixed-dimensional transient time-series feature vectors and static feature vectors; concatenating and fusing the fixed-dimensional transient time-series feature vectors and static feature vectors using a dimension superposition method to form a fused feature vector; inputting the fused feature vector into the initialized multivariate decision tree improved model for iterative training to obtain the power grid time-series stability assessment results and decision path results. This application generates a highly accurate power grid time-series stability assessment tool with a trustworthy decision-making process, providing efficient and accurate guidance for power grid time-series stability assessment. It is applicable to the technical field of transient stability assessment.

The present application relates to the technical field of building energy saving and low-carbon renovation evaluation, and discloses a multi-target decision-making method for low-carbon renovation scheme of existing buildings considering multi-technology coupling correction, comprising: obtaining basic information of a target building and data of a climate zone to which the target building belongs; determining a candidate renovation technology set based on renovation requirements; calling a preset technology coupling matrix to obtain coupling correction coefficients between different technology measures in the candidate renovation technology set; calculating corrected energy-saving amount and corrected carbon reduction amount of each renovation technology combination based on the coupling correction coefficients; calculating multi-dimensional comprehensive scores of each renovation technology combination based on the corrected energy-saving amount, the corrected carbon reduction amount and cost data; and outputting a recommended renovation technology scheme according to the multi-dimensional comprehensive scores. The present application only needs to call coefficients in the preset matrix to correct the energy-saving amount and carbon reduction amount of the renovation technology set, greatly reducing the calculation amount and time cost, and significantly improving the prediction accuracy compared with the single-item superposition method, thereby achieving the best balance between efficiency and accuracy.

This invention discloses a dynamic analysis method for beam structures with arbitrary curvature and varying thickness in a plane, belonging to the field of aerospace structure and structural dynamics modeling technology. The method first inputs the upper and lower surface functions of the curved beam to solve for its neutral surface function; secondly, it constructs a family of orthogonal displacement functions specific to this beam structure with arbitrary curvature and varying thickness, and establishes an integral mapping relationship between the global coordinate system and the dynamic sub-coordinate system; subsequently, based on the displacement function family and the integral mapping relationship, it derives and solves the energy equation of the beam structure; finally, it obtains the mode shapes and natural frequencies based on the Rayleigh-Ritz method, and calculates the dynamic response and dynamic stress of the structure using the modal superposition method. This invention overcomes the shortcomings of existing semi-analytical modeling methods for the dynamics of complex curved beam structures with varying thickness, and can efficiently and accurately predict and analyze the dynamic characteristics of beams with arbitrary curvature and varying thickness in a plane.

A method and system for predicting elastic deformation models in side milling based on superposition is disclosed, relating to the field of end mill technology. To address the problem of significant milling vibration caused by large milling force deformation and large elastic deformation during side milling of weakly rigid parts, a method for predicting elastic deformation models in side milling based on superposition is proposed. This method splits the cantilever beam model into two calculable cantilever beam models, A1 and A2. By calculating the deformation prediction models of model A1 and model A2 respectively, and then superimposing these models, a prediction model of elastic deformation during the side milling process of weakly rigid parts is obtained. The superimposed elastic deformation is consistent with the elastic deformation calculated by simplifying the model to a cantilever beam model. This method is simple to operate, low in cost, and quick, making it suitable for end mill cutting edge design and capable of effectively predicting the elastic deformation model of side milling of weakly rigid parts.

The application discloses a kind of creation method and creation system of virtual dynamic model of electric field, belong to electric field digitization control technical field.Method includes: S1: according to the voltage comprehensive drop degree of each generator at system fault, the generator is grouped, and the generator similar in voltage drop degree at system fault is clustered;S2: the generator of same group is combined into an equivalent generator set according to power superposition method;S3: the corresponding parameters of each equivalent generator set are calculated, and the equivalent model of electric field is obtained.The clustering algorithm used in the patent is simple, and the time consumption is less.In the case of wind speed change and fault at different positions, the equivalent model of the patent is superior to single-machine equivalent model, and the equivalent model of the patent obtains the power dynamic response basically consistent with detailed model.

The application discloses a kind of intelligent sales forecasting system based on multi-modal data fusion, it is related to intelligent management technical field, including, feature extraction module, through convolution calculation method, using first convolution layer and second convolution layer, one-dimensional convolution calculation is carried out to sales data input set, extract short-term time series feature and long-term time series feature, and using residual superposition method is fused, generates sales data time series correlation feature;Semantics extraction module, channel sales record and external text data are classified, segmented and context semantic encoding, generate trend report feature vector;Feature fusion module, sales data time series correlation feature and trend report feature vector are nonlinearly fused and encoded, and generate decoding feature matrix;Decoding regression module, using regression decoding method, decoding regression is carried out to decoding feature matrix, and generates sales volume prediction result.The application realizes the high accuracy and stability of sales volume prediction result.

This invention provides a method for calculating wind turbine wake loss based on volume fraction correction. It includes: generating a spatial computational grid based on the wind farm topography; constructing the spatial boundary of the wind turbine wake region; determining the positional relationship between grid cells and the wake region, and calculating the volume fraction of grid cells that are completely or completely outside the wake region; for grid cells partially located in the wake region, calculating their volume fraction within the wake region using a voxel subdivision method; and correcting the theoretical wind speed attenuation based on the volume fraction to obtain the effective wind speed and actual power of the target grid cell, thereby calculating the wake loss. This invention quantifies the spatial overlap between grid cells and the wake region through a volume fraction correction mechanism, balances computational efficiency and accuracy by combining an adaptive voxel discretization method, and uses a weighted superposition method to handle the wake effect of multiple wind turbines, effectively improving the accuracy and engineering applicability of wake loss assessment.

A method for predicting the sound radiation of a flexible layer laid water flow structure, the sound radiation calculation model of the flexible layer laid water flow structure is divided into model one and model two, the four-terminal acoustic impedance parameters are used to describe the relationship between the sound pressure and the vibration velocity of the inner and outer surfaces of the flexible layer, and the non-coherent wall plane wave superposition method is used to process the fluctuating pressure excitation of the turbulent boundary layer. Model one solves the vibration response of the outer surface and the excitation force transmitted to the inner surface under the assumption that the inner surface of the flexible layer is fixed; model two establishes a coupling equation to solve the vibration response by taking the excitation force as the structure input and considering the sound radiation reaction of the outer surface; and the complete sound radiation power is obtained by linearly superimposing the results of the two models. The present application can accurately describe the physical process of the flow-induced load transmitted to the surface of the structure through the flexible layer, realize the unified vibration-sound coupling solution of the flexible layer laid structure under the action of the outer surface flow-induced load, and provide an efficient and accurate new method for predicting the sound radiation of the flexible layer laid water flow structure in engineering.