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

• 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

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

为获得多粮联合收割机高速运转的基本设计原则，对作物秸秆收获过程中的机械特性进行了研究。首先利用弹性梁的大挠度方程来求解稻、麦等农作物秸秆在卷筒作业时的挠度问题。因此，可以简单地假定作用在作物秸秆上的挠度和载荷之间的关系。此外，由该方程计算得到的被测作物秸秆的弯曲刚度值（EI）分别为2.25 ~ 2.75*10^4N·mm^2（水稻秸秆，HINOHIKARI）和2.65 ~ 3.25*10^4N·mm^2（小麦秸秆，NORIN 61）。其次，采用有限元法分析了作物（水稻、小麦）秸秆的挠曲特性。结果表明，在采用秸秆各节EI平均值的情况下，有限元计算得到的秸秆挠度值和姿态与实测值基本吻合。根据计算结果，只要输入正确的EI值，有限元法就能准确地预测农作物秸秆的实际挠度特性。此外，频率响应（幅度比与频率）和稻秆的固有频率进行了研究。因此，频率响应表现出典型的幅值比峰值，固有频率随EI值的变化而变化。水稻的固有频率分别为1.37Hz和1.13Hz。最后，采用瑞利法对稻杆弯曲振动的固有频率进行了理论分析。因此，本文将瑞利法中的静挠度法和动挠度法引入到分析中。结果表明，采用静挠度法时，实验与分析误差分别为38.7%和47.8%。动态挠度法的误差分别为7.3%和11.5%。根据这一结果，可以用动态挠度法近似地估计稻杆的固有频率。少

项目成果

井上英二: "有限要素法による作物稈の撓み特性の解析" 九州大学農学部学芸雑誌. 52巻1・2号. 51-58 (1997)

井上英二：“利用有限元法分析作物茎的挠曲特性”九州大学农学部学术期刊第52卷第1期和第2期51-58（1997年）。

井上 英二: "有限要素法による作物稈の撓み特性の解析" 九州大学農学部学芸雑誌. 52巻1・2号. 51-58 (1997)

井上英二：“利用有限元法分析作物茎的挠曲特性”九州大学农学院学报第52卷第1期和第2期。51-58（1997）

E.Inoue: "Analysis of the Deflection Characteristics of the Crop Stalk by Finite Element Method" Science Bulletin of the Faculty of Kyushu University. Vol.52 (1.2). 51-58 (1997)

E.Inoue：“利用有限元法分析农作物秸秆的挠度特性”九州大学学部科学通报。

井上 英二: "稲稈の力学特性に関する一考察" 農業機械学会誌. 60巻2号. 145-150 (1998)

Eiji Inoue：“稻秆机械特性的研究”，日本农业机械学会杂志，第 60 卷，第 2. 145-150 期（1998 年）。

E.Inoue: "Mechanical Characteristics of Rice Stalk" Journal of the Japanese Society of Agricultural Machinery. Vol.60, No.2. 145-150 (1998)

E.Inoue：《稻秆机械特性》日本农业机械学会会刊。