Experimental and Theoretical Consideration on Nonlinear Vibration of the Japanese Head-feeding combine

日本头喂料联合收割机非线性振动的实验与理论思考

• 批准号: 05660295
• 负责人: INOUE Eiji
• 金额: $ 1.28万
• 依托单位: KYUSHU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1993
• 资助国家: 日本
• 起止时间: 1993 至 1994
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05660295/
• 关键词: Head-feeding Combine; 6 degrees of Freedom Components of Acceleration; Power Spectrum Density; Phase Trajectory; Poincare Section; Lyapunov Index; Semi-periodic Vibration; Chaos; ポアンカレ断面図、; 非線形振動; 振動加速度; パワースペクトル; ポアンカレ断面; 自由度

Experiments under the stationary and harvesting conditions of the Japanese head-feeding combine, were performed in order to investigate whether the vibration characteristics of the combine featured periodic or semi-periodic or chaotic.Therefore, 6 degrees of freedom components of acceleration at the location of the center of the gravity, and 3 degrees of freedom of acceleration at the location of the operator seat were measured independently. Finally, vibration characteristics of the combine were estimated with the power spectrum density, phase trajectory, Poincare section, and Lyapunov index of the time series data of accelerations.From this research, the following results were obtained.1.Vibration of the combine under the stationary condition (engine, thresher and cutter are driven without harvesting) are mainly influenced by the engine. Further, 1/2,1/3 (subharmonics) frequency components of the engine are observed besides engine driving frequency component (45Hz). From these result … More s, Vibration characteristics under the stationary condition are estimated to indicate semi-periodic nonlinear vibration.2.Vibration of the combine under the harvesting condition are influenced by the engine, threshing unit and driving unit. Namely, some kinds of vibration frequency components in harvesting are observed compared with stationary condition. Further, 1/2,1/3 (subharmonics), 2/3 frequency components of the engine are observed besides engine driving frequency component as same as stationary condition. From existence of these low frequency components, Vibration characteristics under the harvesting condition are estimated to indicate semi-periodic nonlinear vibration with some kinds of frequency components.3.Existence of the chaotic vibration was not recognized due to Lyapunov index whose valuse are -1.0 - -3.0*10^<-3> and due to without existence of period doubling bifurcation.4.Low frequency components such as subharmonics should be reduced from the viewpoint of the human technology in order to design combine harvester with comfortable ride quality. Less

为了研究联合收割机的振动特性是否具有周期、半周期或混沌特征，对日本头喂入式联合收割机进行了静止和收割条件下的实验，因此独立测量了重心位置处的加速度的6个自由度分量和操作员座椅位置处的加速度的3个自由度分量。最后，利用加速度时间序列数据的功率谱密度、相轨迹、庞加莱截面和李雅普诺夫指数来估计联合收割机的振动特性。通过研究，得到以下结果：1.联合收割机在静止工况（发动机、脱粒机和割刀均在不收割的情况下驱动）的振动主要受发动机的影响。此外，除了发动机驱动频率分量(45Hz)之外，还观察到发动机的1/2、1/3(分谐波)频率分量。根据这些结果，估计静止条件下的振动特性，以表明半周期非线性振动。2.联合收割机在收获条件下的振动受到发动机、脱粒装置和驱动装置的影响。即，与静止状态相比，观察到收获时的某些振动频率分量。此外，除了与静止状态相同的发动机驱动频率分量之外，还观察到发动机的1/2、1/3（分谐波）、2/3频率分量。根据这些低频分量的存在，估计采集条件下的振动特性表明具有某些频率分量的半周期非线性振动。3.由于Lyapunov指数的值为-1.0 - -3.0*10^<-3>并且不存在倍周期分岔，因此没有认识到混沌振动的存在。4.诸如 从人类技术的角度来看，应减少次谐波，以设计具有舒适乘坐质量的联合收割机。较少的