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

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...

AI Technical Summary

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.

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