轮式拖拉机振动系统横向固有频率理论建模及验证  

Lateral natural frequency modeling and verification for vibration systems of wheeled tractors

作　　者：薛金林[1,2] 汪珍珍[1] 伊力达尔.伊力亚斯 聂信天[1] 朱思洪[1,2] 

机构地区：[1]南京农业大学工学院,南京210031 [2]江苏省智能化农业装备重点实验室,南京210031 [3]新疆农业大学机械交通学院,乌鲁木齐830052

出　　处：《农业工程学报》2016年第19期51-56,共6页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家自然科学基金资助项目(51275249);江苏省自然科学基金(BK20151436)

摘　　要：为了进一步研究拖拉机的振动特性,对拖拉机振动系统的横向固有频率进行研究,建立了无悬架拖拉机横向和侧倾2自由度振动模型,推导出拖拉机横向固有频率的理论计算公式。以江苏常发集团CF700型拖拉机为研究对象,用理论与试验相结合的方法进行了试验验证,试验分别在5、9、11、13和15 km/h的行驶速度下测得拖拉机的横向固有频率,并与其相应的横向固有频率理论计算值进行比较。结果表明,理论计算值与试验值最大相对误差为1.11%,验证了横向固有频率理论计算公式的准确性,该研究为拖拉机座椅横向减振系统的设计提供了重要参考。In China, operators of off-road vehicles such as agricultural vehicles and mining vehicles are exposed to excessively high levels of vibrations in all of 3 translational modes - vertical, longitudinal and lateral mode, which can pose health risks to the drivers. According to international organization for standardization 2631-1：1997, the lateral vibration can be more hazardous to operators’ work performance, comfort and health than the vertical vibration when the vibration frequency is below 3 Hz, and meanwhile, some vibration systems of off-road vehicles can resonate in this frequency range. But seldom research was conducted on the lateral vibration characteristics of off-road vehicles. In this paper, a new theoretical vibration model including the lateral and roll directions of ride vibration in space was constructed for the unsuspended tractor with 2 degrees of freedom, and the theoretical formula was presented for calculating the lateral natural frequency of domestic tractors. In this lateral vibration model, the radical and lateral stiffness of tires was taken into account. By the use of a CF700 tractor without suspensions from Changfa Group in Jiangsu Province, the accuracy of the theoretical values of the lateral vibration model was improved according to the measured radial stiffness of the tire on the test rig, which was independently developed in light of free vibration logarithmic decrement method for measuring the radial stiffness and damping of tractor tires. And the lateral stiffness of tires was calculated by the mathematic formulas. Subsequently, the rolling moment of inertia of the CF700 tractor’s body was obtained on another test rig, which was independently developed based on simple pendulum with edge and spring method for measuring the moments of inertia of both pitch and roll. The experiments were repeated 3 times. Then, the theoretical and experimental methods were combined to calculate the theoretical values of the lateral natural frequency of the CF700 tractor. Driving experiments wer

关 键 词：拖拉机 固有频率 理论模型 轮胎刚度 转动惯量 

分 类 号：S219.1[农业科学—农业机械化工程]