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

本研究介绍了一个关于在订单中收获crop stalks的机械特征的研究，以实现基本设计原则，通过多crop组合进行高速操作。在开始时，一个用于大型衰减的弹性光束被应用以解决crop stalks的衰减问题（大米，热量）导致通过一个卷轴操作。作为一个结果，这是有可能的，可以假定一种关系之间的关系，在裁剪和加载上进行简单的裁剪跟踪。进一步计算了经测试的crop stalk的灵活性值（EI），该值从2.25-2.75*10^4 N·mm^2 （水稻stalk， HINOHIKARI）和2.65-3.25*10 ^4 N·mm ^2 （wheat stalk， NORIN 61）。下一步，crop （水稻， wheat）stalk的衰减特征是由有限元素法（FEM）分析的。作为crop stalk计算的结果、deflection values和posture of crop stalk由FEM几乎一致地计算的值，在案例中使用平均值的EI在每一个节点的crop stalk上。从这一结果，实际退化特征 ... More stics of crop stalks will be predicted accurately by FEM if correct values of EI are inputted。作为一个结果，一个频率响应被定义为一个典型特征，其中有一个极好的振幅峰值，以及自然频率相对于EI.Moreover，经测试的大米的自然频率在1.37赫兹和1.13赫兹。最后，根据Rayleigh metod的数据，对一个自然频率的弯曲振动的自然频率进行的理论分析。因此，关于静态和动态衰减的两种方法都是在此分析中引入的瑞利方法。As a result， in case of the static deflection method， error between experiment and analysis were 38. 7% and 47. 8%。在动态衰减方法的情况下，误差为7.3%和11.5%。从这一结果来看，动态衰减指标将是可用的，估计接近地跟踪大米的自然频率。Less（低）

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