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Discrete-element-method-based corn threshing process analysis method

A corn threshing and process analysis technology, applied in threshing equipment, agriculture, application, etc., can solve problems such as physical simulation that has not been reported yet

Active Publication Date: 2012-04-18
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

According to the available literature, the physical simulation of the threshing process from the mesoscopic point of view has not been reported using the particle dynamics method.

Method used

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  • Discrete-element-method-based corn threshing process analysis method
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Embodiment Construction

[0040] The specific content and modeling process of the present invention will be further described below in conjunction with the accompanying drawings.

[0041] ①Modeling method of corn thresher

[0042] The modeling method of the thresher is established by adopting the invention patent "Boundary Modeling Method Based on CAD Model" (Patent No. 200510016835.7) obtained by the applicant, that is, the surface of the parts in the thresher in contact with the ear of corn is discretized into primitives, such as a plane , sphere, cylinder, cone, etc., and add motion attributes and material properties, thereby establishing a discrete element method analysis model of the thresher.

[0043] ②Calculation method of force in threshing process

[0044] It can be seen from observation that the ear of corn consists of two parts: the corn cob and the grain growing on the cob, and usually the ear of corn is in the shape of a truncated cone, while the cross section of the corn kernel is approx...

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Abstract

The invention relates to a discrete-element-method-based corn threshing process analysis method. The method is used for researching the corn threshing process. The method comprises the following steps of: establishing a global coordinate system x-y-z and a first local coordinate system X-Y-Z; establishing a discrete element method analysis model of corn ears and corncobs by a spherical particle polymerization method, wherein a connection line of the spherical center of a certain sphere i which is used for forming a corn grain or a corncob and the spherical center of another composed sphere j which is contacted with the corn grain or the corncob is taken as an X' axis, and a Y' axis and a Z' axis meet a right-hand screw rule; transforming contact action repulsion of all composed spheres of each grain which is calculated in the previous step to a third local coordinate system X''-Y''-Z'', and solving resultant force; and when the corn grain is not separated from the corncob if the connection force is less than the connection force determined by the test, evaluating the new position of the remained grain relative to the corncob and updating the position of the corn grain in the third local coordinate system X''-Y''-Z''.

Description

technical field [0001] The invention relates to the research on the corn threshing process, is a new method for analyzing the corn threshing process, and is especially suitable for the analysis of the corn threshing process and the optimization of corn threshers. Background technique [0002] Corn is a typical multi-purpose high-yield crop. After years of development, the planting area of ​​corn in my country has become the second largest crop after rice, with an annual output of nearly 150 million tons of corn. Due to reasons such as geography and climate in various places, most corn is harvested and dried before threshing. Therefore, corn threshers are widely used. [0003] However, due to the complexity of the corn threshing process, so far, the analysis of the corn threshing process reported at home and abroad mostly adopts experimental methods, statistical analysis methods or traditional continuum mechanics analysis methods. Experimental methods and statistical analys...

Claims

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Application Information

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IPC IPC(8): A01F11/06
Inventor 于建群付宏周海玲于亚军王玉杰
Owner JILIN UNIV
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