40 results about "Multiscale modeling" patented technology

Simulation systems, manufacturing systems, software products and controllers are provided with multi-scale modeling in which a coarse mesh and a fine mesh that models a stimulus are decoupled. The fine mesh can be moved within the coarse mesh with a cut and paste operation. The coarse mesh is updated by sparsely propagated effects through the coarse mesh. Simulations of the invention can be conducted in real-time, and be used as controllers in manufacturing systems, such as additive manufacturing systems. A number of efficient methods are provided for solving meshing determinations that arise from movement of a stimulus modeled within a fine mesh.

The invention discloses a module transfer method based on multiscale modeling. The method comprises the following steps: collecting original spectra of a host instrument and a slave instrument; by combining the characteristic of wavelet basis and the characteristic of the original spectrum of a sample, selecting the optimal wavelet basis to carry out wavelet multiscale decomposition on the spectrum to obtain wavelet coefficient; reconstructing the wavelet coefficient; respectively performing multivariate calibration on each layer of reconstructed spectrum; setting up a prediction model based on partial least squares method and leaving one cross-validation method for the spectrum after performing multivariate calibration to obtain a cross-validation root-mean-square error of the prediction model; performing model fusion on the prediction model by using weight number, and calculating the prediction root-mean-square error and related coefficient to evaluate the model transfer effect. Compared with a conventional model transfer method, the method greatly improves the model transfer efficiency and performance, and can be widely applied to fields of near-infrared and Raman spectrum.

The invention discloses a multi-scale modeling and calculation method for the dissolution process of aluminum electrolytic alumina particles, which establishes a three-dimensional computational geometric model of an industrial aluminum electrolytic cell and performs grid division; establishes an accurate description of the coalescence and coalescence of bubbles in the melt of the aluminum electrolytic cell The mesoscopic-scale mathematical model of crushing behavior; accurately derive the three-dimensional gas-liquid phase force data on the melt in the aluminum electrolytic cell, and couple and embed the three-dimensional space data of the electromagnetic force on the melt and the gas-liquid phase force Set processing; build a multi-scale liquid-solid two-phase flow model describing the dissolution process of alumina particles in the aluminum electrolytic cell, coupling multi-phase flow, multi-physics field effects, heat and mass transfer between phases, and the shrinkage behavior of alumina particles. The method of the present invention can accurately calculate and predict the dissolution behavior of alumina particles in large-scale industrial aluminum electrolytic cells, has good applicability and popularization, and is helpful to scientifically guide the optimization design of industrial aluminum electrolytic alumina blanking process. Provide theoretical guidance for efficient and stable production of actual aluminum electrolytic cells.

The invention relates to a skeletal muscle mechanical behavior multiscale modeling method and aims at solving the problem in the prior art that a complete process from cell electrophysiologic action potential activation to skeletal muscle mechanical output cannot be simulated. The method comprises the steps of S1, determining positions and attitudes of muscle fibers; S2, establishing a skeletal muscle macroscopic geometric model and a skeletal muscle microcosmic geometric model according to the S1; S3, carrying out grid division on the geometric models established in the S2; S4, carrying out skeletal muscle electrophysiologic property modeling according to the S3; S5, carrying out multiscale calculation between cells and muscle tissues according to the S3 and S4; S6, establishing a skeletal muscle multiscale biomechanics model according to the S5; and S7, predicting muscular force according to the S6. The method is applied to the field of biomedical engineering.

A multi-scale modeling method for power electronic converters based on coarse and fine scale transformation. Firstly, a single-scale model of power electronic converters at different scales is established to obtain the expression of multi-scale processes at different scales; then, based on wavelet multi-scale The coarse and fine scale transformation in the analysis theory reconstructs the multi-scale process in the power electronic converter, and integrates the expression of the multi-scale process in different scale models; then finds the correlation function between variables on different scales, and establishes different scale models Inter-coupling relationship; finally, the expression of the reconstructed multi-scale process is substituted into the single-scale model or coupling relationship, and the model or coupling relationship is corrected, thus obtaining the required multi-scale model. Compared with the traditional single-scale modeling, the method of the present invention can reflect the dynamic characteristics of the power electronic converter on multiple scales and can reflect the changes in the dynamic characteristics of the converter when considering the phenomena on multiple scales at the same time, and the simulation results are more accurate. fit the actual situation.

The invention relates to a attitude control feedback loop based on a combined fixed attitude of a multi-rate sensor, which comprises an attitude sensor subsystem, an attitude determining subsystem based on multi-scale modeling, and an attitude control subsystem, wherein the attitude sensor subsystem comprises a gyro, a solar sensor and a magnetometer and outputs attitude measurement information with multi-rate characteristics; the attitude determining subsystem is used for describing measurement information of each sensor from different scales by using a multi-scale analyzing method and estimating the satellite attitude angle on the basis of the established multi-scale model; and the attitude control subsystem is used for controlling the satellite attitude and feeding the controlled attitude information back to the attitude sensor subsystem so as to form the attitude control loop. The attitude control feedback loop is used for carrying out multi-scale modeling by using the multi-scale analyzing method, thereby improving the attitude determining precision while reducing the complexity of an attitude combining and fixing process.

The invention provides a multi-scale finite element modeling method for welded box-section steel nodes, including: S1, selecting unit type combinations for multi-scale modeling in ANSYS finite element software; S2, for welding box-section steel nodes Carry out preliminary geometric modeling; S3. Ensure that the direction of the rods in the space structure is correct by adjusting the direction points of each member; S4. Delete the redundant parts where the intersections of the rods penetrate each other inside the rods to meet the requirements of each rod The characteristics of the welded section between the joints; S5. Assign solid element attributes to the 1 / 3 length of each member in the complete geometric model of the node, and assign the beam element attribute to the 2 / 3 length, and perform rough mesh and fine mesh division to obtain multi-scale nodes Finite element model; the present invention combines the unique advantages of the multi-scale finite element model, proposes a multi-scale finite element modeling method for welded box-section steel nodes, assists the structural health monitoring system, obtains local detail information of welded box-section nodes, and simulates structures Authentic behavior to ensure structural safety.