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Position: Home > Articles > Impact Mechanical Characteristics Analysis of Rice Grain Transactions of the Chinese Society for Agricultural Machinery 2013,44 (6) 88-92

水稻籽粒碰撞力学特性研究

作  者：
赵湛;李耀明;陈义;梁振伟;刘丽霞
单  位：
中国机械工业集团有限公司;江苏大学现代农业装备与技术教育部重点实验室
关键词：
水稻籽粒;椭球颗粒;离散元法;碰撞;力学特性
摘  要：
根据水稻籽粒的物理特性建立了椭球体颗粒模型,采用离散元法模拟了籽粒与检测传感器碰撞力学过程。结果表明:对心碰撞时的峰值法向接触力Fn max随着曲率半径的增加而增大,偏心碰撞时籽粒将发生转动,Fn max随着法向重叠量的减小而减小;Fn max的差异随着粒径比γ的增加而增大,当γ=3时峰值力比率η的最小值小于45%。斜碰撞时η的变化呈现出不对称特性,且η的变化范围也随之增大,当γ=3时η的最小值约为30%,接触力上升时间tr为14～26μs。采用PVDF压电薄膜作为敏感元件设计了检测传感器,并进行了水稻籽粒冲击力学试验。结果表明,在相同碰撞速度下,输出电压峰值在2～4 V范围内波动,接触力上升时间tr为15～35μs。
译  名：
Impact Mechanical Characteristics Analysis of Rice Grain
作  者：
Zhao Zhan1 Li Yaoming1 Chen Yi1 Liang Zhenwei1 Liu Lixia2(1.Key Laboratory of Modern Agricultural Equipment and Technology,Ministry of Education,Jiangsu University, Zhenjiang 212013,China 2.China National Machinery Industry Corporation,Beijing 100080,China)
关键词：
Rice grain Ellipsoid Discrete element method Impact Mechanical properties
摘  要：
An ellipsoid particle model was established according to the physical properties of rice grain.The discrete element method was used to simulate the impact process of a grain with a detection sensor.The results indicated that the peak normal contact force Fn max was increased with the increasing of curvature radius during the central impact process.Rotation of grain was driven during the eccentric impact process which reduced the value of Fn max.The differences of Fn max was enlarged with the increasing of grain radius ratio γ,and the minimal value of peak force ratio η was lower than 45% with γ of 3.The asymmetric variation behavior of η was shown during the oblique impact process and the variation range of η was increased.The minimal value of peak force ratio η was about 30% with γ of 3.The rise time of impact force tr was in the range of 14～26 μs.Then,a detection sensor using piezo-electric polyvinylidene fluoride(PVDF) film as sensitive material was presented and the rice grains impact tests were carried out.The results showed that the peak output voltage was fluctuated in 2～4 V,and the rise time of impact force tr was 15～35 μs.

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