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A General Method of Discrete Element Method Boundary Modeling

A general method and discrete element technology, applied in special data processing applications, instruments, calculations, etc., can solve problems such as the expression of elementary analytical functions

Active Publication Date: 2011-12-28
JILIN UNIV
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Problems solved by technology

The other type is the irregular surfaces that cannot be expressed by elementary analytic functions

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  • A General Method of Discrete Element Method Boundary Modeling
  • A General Method of Discrete Element Method Boundary Modeling
  • A General Method of Discrete Element Method Boundary Modeling

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[0064] The specific content and modeling process of the present invention will be further described below in conjunction with the accompanying drawings.

[0065] Generally speaking, the structure of mechanical parts is relatively complex, but the surface of parts that are in contact with granular materials can generally be divided into two types. One is regular surfaces that can be expressed by elementary analytical functions, such as planes, spheres, cylinders, and cones. The other is an irregular surface that cannot be expressed by elementary analytic functions. For regular surfaces and regular surfaces with missing parts, the function describing the surface can be used directly to establish its discrete element method analysis model, which is called regular surface modeling method. For irregular surfaces, it can be discretized into a combination of multiple regular surfaces, and its discrete element method analysis model is established from these regular surfaces, which is...

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Abstract

The invention relates to a universal method of boundary modeling based on distinct element method, which is applicable to analyze and evaluate the service performance of a mechanical part through distinct element method. The technical solution comprises the following steps: step 1, alternately identifying a part surface for contacting particle material in the mechanical part; step 2, automatically identifying that the part surface is a regularly curved surface or an irregularly curved surface; step 3, automatically identifying the missing part of the regularly curved surface; step 4, dispersing the irregularly curved surface into combination of regularly curved surfaces; step 5, reading the parameter of the regularly curved surface; step 6, alternately adding the motion parameters and material characteristic parameters of the curved surface; step 7, storing boundary model data. By changing the CAD (Computer - Aided Design) model of the mechanical part, the performances of mechanical parts with different structures and sizes can be analyzed so as to optimize the structures and sizes of the mechanical parts, thus solving the technical problem on the optimum design of the mechanical parts and bringing about remarkable technical effects.

Description

technical field [0001] The invention relates to a general method for establishing a discrete element method analysis model of a mechanical part when the discrete element method is used to analyze the contact effect between the granular material and the mechanical part (also known as the boundary), and is suitable for use when the discrete element method is used to analyze and evaluate the working performance of the mechanical part . Background technique [0002] In the field of industrial and agricultural production, there are a large number of contact actions between granular materials and mechanical parts and the flow process of granular materials. For example, in the field of agricultural production, in the process of plowing, ditching, sowing, fertilizing, threshing, separation, cleaning, crushing, drying, conveying, storage, grading, processing and packaging, there is always contact between granular materials and mechanical parts and the flow of granular materials. In...

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Application Information

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IPC IPC(8): G06F17/50
Inventor 于建群付宏吕昊徐静王扬
Owner JILIN UNIV
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