Study on High Speed Operation in Harvesting by Multi-Crop Combine

多作物联合收获机高速作业研究

基本信息

批准号：
08456127
负责人：
INOUE Eiji
金额：
$ 0.7万
依托单位：
KYUSHU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08456127/
关键词：
Multi crop Combine Equation of large deflection Analysis of F E M Flexural rigidity (EI)Frequency response Natural frequency Rayleigh method Dynamic deflection method 作物稈のたわみ特性動たわみ性稲稈静的たわみ量曲げ剛性同定汎用形コンバイン加振実験有限要素法

项目摘要

This study was performed concerning mechanical characteristics of crop stalks in harvesting in order to obtain fundamental design principles for high speed operation by Multi-crop Combine.At the beginning, an equation for large deflection of elastic beam were applied to solve the deflection problem of crop stalks (rice, wheat) caused by a reel operation. As a result, it was possible to presume a relationship between deflection and load acting on crop stalks simply. Further, Flexural rigidity values (EI) of tested crop stalks calculated from this equation were 2.25-2.75*10^4N・mm^2 (rice stalk, HINOHIKARI) and 2.65-3.25*10^4N・mm^2 (wheat stalk, NORIN 61).Next, the deflection characteristics of crop (rice, wheat) stalks was analyzed by Finite Element Method (FEM). As a result, deflection values and posture of crop stalks calculated by FEM almost coincided with measured values in case of using average values of EI at every knots of crop stalk. From this result, actual deflection characteri … More stics of crop stalks will be predicted accurately by FEM if correct values of EI are inputted.Further, a frequency response (amplitude ratio against a frequency) and a natural frequency of rice stalks were investigated. As a result, a frequency response indicated a typical characteristics which has a excellent peak in amplitude ratio, and natural frequency particularly varied depending on the values of EI.Moreover, natural frequency of tested rice were 1.37Hz and 1.13Hz.Finally, theoretical analysis of a natural frequency for bending vibration of rice stalks was performend by Rayleigh metod. Therefore, both methods of static deflection and dynamic deflection concerning Rayleigh metod were introduced to this analysis. As a result, in case of the static deflection method, error between experiment and analysis were 38.7% and 47.8%. In case of the dynamic deflection method, error were 7.3% and 11.5%. From this result, dynamic deflection metod will be available to estimate a natural frequency of rice stalks approximately. Less

进行了这项研究，涉及收获中作物茎的机械特性，以获得多杂音组合的高速操作的基本设计原理。一开始，应用了弹性束的大偏转方程来解决由卷轴操作引起的作物（大米，惠特）的挠度问题。结果，可以简单地假定挠度与作物茎上作用的负荷之间的关系。此外，根据该方程式计算的作物茎的弯曲刚度值（EI）为2.25-2.75*10^4n n・mmm^2（米茎，hinohikari）和2.65-3.25*10^4nn・mm^2 （FEM）。结果，在农作物茎的每个结处使用EI的平均值时，由FEM计算出的挠度值和作物茎的姿势几乎与测量值相吻合。从此结果，如果输入了正确的EI值，则FEM可以准确预测农作物茎的实际挠度特征。结果，频率响应表明典型的特征在放大器比的峰值上具有出色的峰值，并且固有频率特别取决于EI的值。此外，测试米的固有频率为1.37Hz和1.13Hz。实际上，对大米Stalks的固有频率进行了理论分析。因此，将两种静态挠度和动态挠度的方法都引入了该分析。结果，在静态挠度方法的情况下，实验和分析之间的误差为38.7％和47.8％。在动态挠度方法的情况下，误差为7.3％和11.5％。从这个结果，动态挠度Metod将可以估算大约大约茎的固有频率。较少的