39 results about "Macroscopic model" patented technology

The invention discloses a method for evaluating damage and fatigue life of a micro-macro scale sheet metal forming process model. The invention establishes a microscopic plastic constitutive model and couples macroscopic geometry, and at the same time simulates the sheet metal forming process. On this basis, establishes a micro-macrocoupling fatigue damage model for fatigue life prediction, and explores the sheet metal forming process and fatigue failure mechanism. The application provides theoretical guidance and basis for process optimization. Explore the distribution of material properties and plastic deformation evolution in the sheet metal forming process from a microscopic perspective; study the influence and contribution of microscopic features such as grain size, orientation distribution, and precipitated phase distribution on the sheet metal forming process; further couple macroscopic models and processes to study fatigue damage and assess component fatigue life. The invention is a reliable and efficient calculation model and evaluation method, and the establishment of related models and algorithms has important scientific innovation and engineering application value.

The present invention relates to a kind of evacuation simulation method of T-shaped intersection based on crowd evacuation macroscopical model, comprise the following steps: 1) establish Aw-Rascle crowd dynamics model; 2) On the basis of described Aw-Rascle crowd dynamics model, introduce intersection The influence matrix of the area is used to construct a macroscopic model of crowd evacuation at the T-shaped intersection; 3) numerical simulation is performed based on the macroscopic model of crowd evacuation at the T-shaped intersection, and the simulation results are displayed. Compared with the prior art, the present invention has the advantages of conforming to the actual situation, being able to quickly identify the critical value of the density, and completing the positioning of the high-risk area.

The invention relates to an elastic-medium active-source and passive-source mixed-collection seismic-data full-waveform inversion method. The method comprises the following steps of firstly, carryingout seismic interference processing on collected passive source elastic multi-component seismic data and acquiring four different modes of virtual gun multi-component records; then, dividing each twoof the different modes of virtual gun records into one group, and carrying out elastic-wave multi-component independent wavelet inversion; and finally, using a cross selection method, and using high-quality Vp and Vs macromodels as the initial models of missing low-frequency active-source elastic-wave multi-component full-waveform inversion so as to carry out inversion iteration. Through passive-source elastic multi-component seismic record and active-source seismic record serial processing, the low frequency missing series problems of the inversion can be overcome and accurate detail and deepportion construction information can be acquired, the macroscopic and detail construction information of longitudinal and transverse wave speed models can be well depicted, the cyclic skipping problem of the inversion is greatly alleviated, and finally, accurate macroscopic construction and accurate detail construction information are possessed.

The invention discloses an origin-destination (OD) estimation method for the traffic demand of a port roadway based on freight processes. The method is based on an activity theory, the entire freight logistics procedure is taken as a research unit, the main traffic generation and attraction point of a harbor district is taken as a starting point, and the typical freight logistics procedure of cargo vehicles in the harbor district is taken as an analysis object. Under the precondition of obtaining these basic data which are the basic parameters of the storage yards of the harbor district, the flow rate of each egress and ingress sluice gate in the harbor district and the collecting and distributing proportion of a dock roadway, the cargo quantity of each storage yard and the cargo collecting and distributing quantity of the dock roadway are estimated, the attraction intensity of each sluice gate, each storage yard and each dock in the harbor district is analyzed, the selective probability of different travelling routes of different freight process modes is also calculated, the generation and attraction quantity of each OD pair of the harbor district is estimated so as to obtain an OD matrix for the traffic generation and attraction of a port roadway, finally a macroscopic model of the harbor district is constructed by utilizing a VISUM, the OD of the harbor district is inversed according to the measured flow rate, and the relative error of the OD matrix and the OD is compared so as to verify the reliability of model estimation.

The invention provides a hyperelasticity constitutive model modeling method of a rubber material. The method comprises the following steps: firstly, providing an influence model of a polymer molecular chain volume; secondly, improving an eight-chain model and providing a probability density function caused by topological constraints; then, establishing a relation between microscopic deformation and macroscopic deformation of a molecular chain and deducing a strain energy density function of the rubber material accordingly to obtain a non-affine hyperelasticity constitutive model. The established hyperelasticity constitutive model of the rubber material considers the influences on the polymer molecular chain volume, non-affine deformation and the topological constraints and a physical relation between a macroscopic model parameter and a microscopic molecular structure is established, so that the essence of polymer macromolecular mechanic deformation can be more deeply reflected and the hyperelasticity property of the rubber material in a multifunctional structure can be more accurately simulated.