Simulation of Vibration Response of Flexible Crop Stem Based on Discrete Element Method

被引：0
|
作者：
Wang Q. [1 ]
Mao H. [1 ,2 ]
Li Q. [1 ]
机构：
[1] Key Laboratory of Modern Agricultural Equipment and Technology, Ministry of Education, Jiangsu University, Zhenjiang
[2] High-tech Key Laboratory of Agricultural Equipment and Intelligentization of Jiangsu Province, Zhenjiang
来源：
Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery | 2020年 / 51卷 / 11期
关键词：
Crop stem; Discrete element; Flexibility; Vibration;
D O I：
10.6041/j.issn.1000-1298.2020.11.014
中图分类号：
学科分类号：
摘要：
In the field of harvesting machinery, it is advantageous to consider the characteristics of crops in the design stage rather than through actual mechanical tests especially in terms of reducing costs and shortening the development cycle. By establishing a dynamic model that considered the vibration response characteristics of flexible crop stems, it was of great significance to explore the separation mechanism of grains and grass, analyze the grains separation process and optimize the parameters of the combine harvester. A dynamic simulation method for flexible crop stem was proposed, and the dynamic response characteristics of crop stem were studied. Firstly, the dynamic model and dynamic simulation method of crop flexible stem were given. Taking the third internode of the mature wheat as an example, important parameters such as the inner and outer diameter, unit mass density and elastic modulus of the stem were measured. Then, by simulating the lateral and longitudinal vibration characteristics of the stem, the basic dynamic response characteristics of the stem were studied, and the reliability of the simulation was verified by comparing with the theoretical calculation results. The lateral vibration frequency and longitudinal vibration frequency of the wheat stems with a length of 108 mm, an outer diameter of 3.7 mm, an inner diameter of 1.9 mm, and a Young's modulus of 5.27 GPa obtained by simulation were 164.28 Hz and 7 633.59 Hz, respectively. The relative errors of the theoretical calculation results were 0.28% and 0.12%, respectively. Finally, the practicability of the flexible stem model was verified by simulating the separation experiment. The simulation results were in good agreement with the theoretical calculation results. © 2020, Chinese Society of Agricultural Machinery. All right reserved.
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页码：131 / 137
页数：6
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