6 results about "Ellipsoidal particle" patented technology

The application discloses a method and system for forming an elliptical particle accumulation body, and applies to the fields of geotechnical engineering and material science technology, and comprises the following steps: defining a space boundary and a calculation rule; generating and placing bottom-layer elliptical particles in a left-to-right placement order: determining a circular arc segment in contact with a container boundary line, and determining the center of a first bottom-layer elliptical particle based on translation and offset calculation of a left boundary and a lower boundary; randomly generating a bottom-layer elliptical particle, forming an intrusion block with a previous elliptical particle, and performing placement judgment of the bottom-layer elliptical particle based on line segment information after offset of the lower boundary and the right boundary of the container; generating and placing upper-layer elliptical particles: randomly generating an upper-layer elliptical particle, traversing a current accumulation body surface elliptical particle set to form a corresponding intrusion block, and performing placement judgment of the upper-layer elliptical particle based on line segment information after offset of the left boundary, the right boundary and the upper boundary of the container. The application realizes generation of an elliptical particle accumulation body with high density and low porosity.

The application provides a parallel computing method for gas-solid simulation, which comprises the following steps: forming a geometric boundary as a solid by building a plurality of static geometric shape units according to a multiphase complex boundary condition; setting an initial state of a system to be simulated, and adopting a spherical or ellipsoidal particle model for a gas particle; performing spatial decomposition on the system to be simulated to obtain a plurality of sub-regions, each of which comprises an interior and a boundary, the interior is simulated by a hard sphere, and the boundary is simulated by a pseudo-particle, each of the sub-regions is divided into a plurality of grids, a mapping relationship between the particles and the grids is established, and the geometric boundary in each of the grids is calculated; within a set time step, updating particle information based on event driving and in view of particle collision in the interior of each of the sub-regions and particle collision between the particles and the geometric boundary; updating the particle information based on time driving and in view of particle collision on the boundary of each of the sub-regions and particle collision between the particles and the geometric boundary; and outputting a simulation result.

A heat conduction sheet includes a heat conduction layer containing at least one kind of graphite particles (A) selected from the group consisting of scale-like particles, ellipsoidal particles and rod-like particles, wherein in a case of scale-like particles, a plane direction of the particle is oriented in a thickness direction of the heat conduction sheet, and in a case of ellipsoidal particles or rod-like particles, a long axis direction of the particle is oriented in the thickness direction of the heat conduction sheet, and the heat conduction sheet contains a metal component having a melting point of 200° C. or less.

This application relates to the field of bistatic polarimetric radar technology, and particularly to a simulation method and system for bistatic fully polarimetric radar ellipsoidal particle target imaging based on electromagnetic properties. The method includes: setting radar parameters and ellipsoidal particle target parameters; calculating the far-field scattering coefficients of the ellipsoidal particles at different frequencies and target rotation angles under different polarization channels based on the radar parameters and ellipsoidal particle target parameters and utilizing the electromagnetic scattering characteristics of the ellipsoidal particles; simulating the received echoes of the corresponding bistatic fully polarimetric radar system based on the far-field scattering coefficients under different polarization channels, and extracting the scattering coefficients of noisy targets from the received echoes; and performing imaging processing on the scattering coefficients of each noisy target based on the bistatic inverse synthetic aperture radar (ISAR) turntable imaging principle to obtain a bistatic fully polarimetric radar image of the ellipsoidal particle target. This application simplifies the simulation process, fully considers the actual noise impact, and improves imaging efficiency.

The application belongs to the technical field of gas-solid two-phase flow experiment, and particularly relates to a collision experiment method considering the orientation angle of ellipsoidal particles. The collision experiment method considering the orientation angle of ellipsoidal particles comprises a high-pressure air compressor, a pressure gauge, a control valve, a gas conveying pipe, a nozzle support frame, a nozzle, an orientation angle control system, a test piece, an adjustable angle frame, ellipsoidal particles, a detachable particle positioner, a telescopic fence, a positioning groove, a lifting handle, a fixed-angle arc surface and a positioner plane, and constitutes an ellipsoidal particle-test piece collision experiment system, so that collision experiment research on ellipsoidal particles with different orientation angles and test pieces can be realized. The orientation angle control system comprises the detachable particle positioner, the telescopic fence, the positioning groove, the lifting handle, the fixed-angle arc surface and the positioner plane, so that the orientation angle can be controlled. The application provides a collision experiment method considering the orientation angle of ellipsoidal particles, and has the advantages of controllable variable speed of ellipsoidal particles and controllable adjustment of the orientation angle.

The invention discloses a molecular dynamics model construction method and system for non-spherical rigid particles, and particularly relates to the technical field of model construction.The molecular dynamics model construction system comprises an input module used for receiving particle gradation parameters input by a user and generating particle gradation; the input module is connected with a set modeling module which is used for carrying out geometric approximate modeling on ellipsoidal particles through a multi-ball combined model. According to the method, high-precision and automatic modeling of non-spherical particles from abstract parameters to specific simulation is realized, abstract statistical distribution parameters are automatically converted into physical and real particle models which can be directly used for simulation, and the defects that in the prior art, manual modeling efficiency is low, and a universal platform lacks native support are overcome. Through a three-ball combination model and a volume correction algorithm thereof, the precision of geometric simulation is remarkably improved while the calculation efficiency is ensured.