水田作业工况的拖拉机振动特性

发布时间：2018-02-28 00:23

  本文关键词： 农业机械 拖拉机 试验 水田工况 功率谱密度 振动频率 硬底层　出处：《农业工程学报》2016年11期 　论文类型：期刊论文

【摘要】：为研究拖拉机在水田工况下的振动特性。该文采用轮胎滚动法测取南京江浦农场水田硬底层纵断面空间函数,对数据进行自相关性检验,分析硬底层垂直位移功率谱密度;以CF700型拖拉机(常发集团)为研究对象,基于轮胎-湿软水田土壤系统,建立水田工况下拖拉机三自由度振动微分方程和仿真模型,以水田硬底层纵断面时间函数为输入矢量,对拖拉机振动特性进行仿真研究,并将仿真结果与试验结果进行对比分析。结果表明,水田硬底层高程具有统计相关性,其不平度系数Gx(0.1)=316.7×10-6 m3,拟合指数w=-1.651;试验所得拖拉机前桥、后桥及座椅椅面垂向振动频率分别是2.91、3.6及2.5 Hz,与仿真结果相对误差分别为19.9%、7.2%、16.0%。以上结果为面向水田作业的拖拉机振动研究提供路面参考模型,验证了水田工况下拖拉机三自由度平面振动模型的有效性,为拖拉机减振系统的参数设计提供理论依据。
[Abstract]:In order to study the vibration characteristics of tractor under paddy field conditions, the vertical displacement power spectral density of hard bottom layer was analyzed by using tire rolling method to measure the spatial function of the vertical bottom section of the paddy field in Jiangpu farm, Nanjing, and to test the autocorrelation of the data. Taking the CF700 tractor (Changfa Group) as the research object, based on the soil system of tire and wet soft paddy field, the differential equation of vibration and simulation model of the tractor with three degrees of freedom under the condition of paddy field are established, and the time function of vertical section of the hard bottom layer of paddy field is taken as the input vector. The vibration characteristics of tractor are simulated and compared with the test results. The results show that the height of hard bottom of paddy field has statistical correlation, the coefficient of irregularity is Gx(0.1)=316.7 脳 10-6 m3, the fitting index is wn-1.651.The test results show that the front axle of tractor is obtained. The vertical vibration frequencies of rear axle and chair face are 2.91g / 3.6 and 2.5 Hz respectively, and the relative error from the simulation results is 19.9and 7.2g / 16.0 respectively. The above results provide a road reference model for the study of tractor vibration facing paddy field operation. The validity of the three-degree-of-freedom plane vibration model of the tractor under paddy field conditions is verified, which provides a theoretical basis for the parameter design of the tractor vibration absorption system.
【作者单位】： 南京农业大学工学院;江苏省智能化农业装备重点实验室;
【基金】：国家自然科学基金资助项目(51275249)
【分类号】：S219
，

本文编号：1544956