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山核桃树枝条物理参数的测定及分析

发表时间:2014-10-15  浏览量:1451  下载量:636
全部作者: 谢奇志,贺磊盈,武传宇
作者单位: 浙江理工大学机械与自动控制学院
摘 要: 研究分析山核桃树的动力学特性有助于实现果实的自适应振动采收。研究目的是通过实验测定山核桃枝条的密度、动态弹性模量和阻尼比,从而为分析山核桃树的动力学特性提供有效参数。通过悬臂梁振动实验和应力波测试实验,分别得到果树枝条的动态弹性模量Ev和Es. 分析数据发现,由于枝条节点、含水率等因素的影响,很难建立两者之间的确定关系,说明根据测量应力波的传播速度估计动力学分析所需要的动态弹性模量Es的方法不可行。
关 键 词: 农业工程;山核桃树枝条;弹性模量;悬臂梁振动;应力波测试
Title: Measurement and analysis of physical parameters of living Chinese Hickory tree
Author: XIE Qizhi, HE Leiying, WU Chuanyu
Organization: Faculty of Mechanical Engineering and Automation, Zhejiang Sci-Tech University
Abstract: The study of Chinese Hickory tree’s dynamic characteristics will help to achieve adaptive vibration harvesting of fruits. The object of this paper is to obtain the physical parameters of Chinese Hickory tree including density, dynamic elastic modulus and damping ratio, which can provide effective parameters for dynamic analysis of Chinese Hickory tree. Through the cantilever vibration testing and stress wave experiments of branches, two dynamic elastic modulus named Ev and Es were obtained respectively. Results showed that it was difficult to establish a certain relationship between Ev and Es, because the influences both by the nodes and moisture are unclear. This indicates that it is impossible to estimate the dynamic elastic modulus Es, which is used for dynamic analysis, from measuring the velocity of stress in the Chinese Hickory tree.
Key words: agricultural engineering; Chinese Hickory tree; elastic modulus; vibration in cantilever beam; stress wave
发表期数: 2014年10月第19期
引用格式: 谢奇志,贺磊盈,武传宇. 山核桃树枝条物理参数的测定及分析[J]. 中国科技论文在线精品论文,2014,7(19):1966-1971.
 
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