卷盘喷灌机传动系统的疲劳仿真

Fatigue simulation of transmission system of hose reel irrigators

为了分析卷盘喷灌机传动系统关键零部件的实际受力和预估其疲劳寿命值,提出一种多体动力学仿真和有限元法相互结合进行结构疲劳寿命预测的方法,并以蜗轮蜗杆传动系统为例进行了疲劳寿命计算.在ADAMS中建立了传动系统主要受力部件的虚拟样机仿真模型;利用ADAMS的多体仿真技术获得蜗轮蜗杆传动系统的动载荷历程;利用ANSYS软件的基于应力的结构安全因子分析法对传动系统的齿轮、轴承和链进行疲劳寿命预测,其中包括静强度值和寿命估计.仿真结果表明:齿轮16仿真的合力值为5 392 N,理论上所受的最大合力为5 526 N,仿真误差为2.42%;齿轮16齿根弯曲疲劳寿命值为2.34×105次;轴承8最大径向力为1 685 N,疲劳寿命值为1.12×105h;链节在0~1 s范围内的峰值张紧力的平均值为11 837.2 N,理论计算值为12 012 N,实际计算误差为1.45%.仿真值与理论值误差很小,该方法可以对疲劳事故的原因进行诊断,并且可以作为采用工艺强化措施的依据.

In order to analyze the actual stress condition of the key parts of the transmission system of hose reel irrigators,and to estimate the fatigue life,the structure fatigue life prediction method based on the multibody dynamics simulation and Finite Element Method（ FEM） was proposed,and the worm drive system fatigue life was predicted with this method as an example. The virtual prototype simulation model of the main components of the transmission system was established. The dynamic load histories of the worm drive system were evaluated by applying the ADAMS multibody system analysis technique;the fatigue life of gear,bearing and chain of transmission system were estimated by the Software ANSYS stress-based safety factor technology,which includes static strength and life estimation. The simulation results show that the resultant force of gear 16 is 5 392 N,the maximum theoretical force is 5526 N,and the simulation error is 2. 42%; the bending fatigue life value of gear 16 is 2. 34 × 105; the maximum radial force of bearing 8 is 1 685 N,and the fatigue life is 1. 12 × 105h; the average link peak in the range of 0-1 s tension is 11 837. 2 N,the theoretical calculation value is 12 012 N,the actual calculation error is 1. 45%. The error between the simulation value and the theoretical value isvery small,which indicates that the simulation method can be used to diagnose the causes of fatigue accidents,and can serve as the basis for strengthening measures.