A method of establishing a finite element model for simulating the dynamic contact of corn ears
A corn ear and finite element technology, which is applied in the field of model establishment for simulating the actual threshing impact of corn ear, can solve problems such as difficulty in optimizing the theoretical basis of threshing device, inability to accurately express the actual corn ear model in the field, etc., so as to improve the threshing process and optimize the The effect of the threshing device
Inactive Publication Date: 2017-04-12
HENAN UNIV OF SCI & TECH
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Problems solved by technology
This modeling method cannot accurately express the actual corn ear model in the field, and the experimental analysis based on this model is difficult to provide a suitable theoretical basis for optimizing the threshing device
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[0030] A method for establishing a finite element model for simulating corn ear dynamic contact, comprising the following steps:
[0031] (1) Establish corn ear model
[0032] a. Select several corn cobs of the same variety with a moisture content of 10%, measure the diameter and length of the corncob and take the mean value respectively, make the end face circle of the corncob according to the mean value of the diameter, and stretch out the cylindrical model of the corncob according to the mean value of the length, and According to the average ear row number n of choosing corn ear, the two ends of the corn cob cylinder model are correspondingly divided into n equal parts fan-shaped; figure 1 As shown, the end face of the corncob cylinder model is equally divided into sixteen equal sectors.
[0033]B, select some corn kernels on the corn ear that takes in step a, measure the size of corn kernels and get mean value, make as follows according to mean value image 3 The vertica...
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The invention discloses a method for setting up a finite element model simulating corn ear power contact. The method includes steps of (1) setting up a corn sear model; (2) setting up the finite element model, to be specifically, setting up a punch model, meshing corncobs and niblets in the punch model and the corn ear model, measuring extrusion force among the niblets in a seam A and among the niblets in a seam B, the extrusion force among the niblets along the axis direction of the corncobs and conection force between carpopodiums of the niblets and the corncobs in actual corn ears by a thrust meter, and simulating setup action force at the joints of meshes of the corncobs and the niblets via spot welding according to a measurement result of the thrust meter. Based on growth and arrangement characteristics of the niblets of the corn ears, the corn ear model and the finite element model are set up, and via power contact analysis, stress distribution transfer rule and niblet scattering mechanism of the corn ears under the action of a punch are obtained and provide a reference for modifying a threshing process and optimizing a thresher.
Description
technical field [0001] The invention relates to a method for establishing a model for simulating the actual threshing impact of corn ears, in particular to a method for establishing a finite element model for simulating the dynamic contact of corn ears. Background technique [0002] Corn is one of the main food crops in my country. Corn threshing principles mainly include impact, rubbing, combing, rolling, squeezing, etc. Among them, impact threshing is the most commonly used threshing method for domestic corn. The threshing damage rate of corn kernels directly affects corn storage and seed production. Therefore, choosing Appropriate threshing process and threshing device can reduce the broken rate of corn kernels. [0003] At present, domestic and foreign researches based on corn ear threshing process mainly include discrete element method and test method. et al. Corn cob modeling method based on granular aggregates [J]. Journal of Agricultural Engineering, 2012, 28 (8): ...
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IPC IPC(8): G06F17/50
Inventor 李心平马义东杜哲马磊吴康高春艳马福丽
Owner HENAN UNIV OF SCI & TECH