赵湛,李耀明,陈义,梁振伟,刘丽霞.水稻籽粒碰撞力学特性研究[J].农业机械学报,2013,44(6):88-92.
Zhao Zhan,Li Yaoming,Chen Yi,Liang Zhenwei,Liu Lixia.Impact Mechanical Characteristics Analysis of Rice Grain[J].Transactions of the Chinese Society for Agricultural Machinery,2013,44(6):88-92.
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水稻籽粒碰撞力学特性研究   [下载全文]
Impact Mechanical Characteristics Analysis of Rice Grain   [Download Pdf][in English]
  
DOI:10.6041/j.issn.1000-1298.2013.06.017
中文关键词:  水稻籽粒  椭球颗粒  离散元法  碰撞  力学特性
基金项目:高等学校博士学科点专项科研基金资助项目(20103227120010)、中国博士后科学基金资助项目(20110490124)、江苏省博士后科研基金资助项目(1102131C)和江苏高校优势学科建设工程资助项目(PADP)
作者单位
赵湛 江苏大学 
李耀明 江苏大学 
陈义 江苏大学 
梁振伟 江苏大学 
刘丽霞 中国机械工业集团有限公司 
中文摘要: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14~26μs。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15~35μs。
Zhao Zhan  Li Yaoming  Chen Yi  Liang Zhenwei  Liu Lixia
Jiangsu University;Jiangsu University;Jiangsu University;Jiangsu University;China National Machinery Industry Corporation
Key Words:Rice grain  Ellipsoid  Discrete element method  Impact  Mechanical properties
Abstract: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. 

Transactions of the Chinese Society for Agriculture Machinery (CSAM), in charged of China Association for Science and Technology (CAST), sponsored by CSAM and Chinese Academy of Agricultural Mechanization Science(CAAMS), started publication in 1957. It is the earliest interdisciplinary journal in Chinese which combines agricultural and engineering. It always closely grasps the development direction of agriculture engineering disciplines and the published papers represent the highest academic level of agriculture engineering in China. Currently, nearly 8,000 papers have been already published. There are around 3,000 papers contributed to the journal each year, but only around 600 of them will be accepted. Transactions of CSAM focuses on a wide range of agricultural machinery, irrigation, electronics, robotics, agro-products engineering, biological energy, agricultural structures and environment and more. Subjects in Transactions of the CSAM have been embodied by many internationally well-known index systems, such as: EI Compendex, CA, CSA, etc.

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