果园运输机单轨道橡胶辊驱动装置驱动性能研究

Driving Performance of Single-track Rubber Roller Driving Device

通过搭建的游动正压力夹紧和双自由度相向扭矩施加方式的试验台进行了单轨道橡胶辊驱动装置驱动性能的试验研究,得出了压缩量、摩擦力与正压力的关系曲线。为了进一步分析橡胶辊变形对摩擦力的影响,利用非线性有限元方法中Mooney-Rivlin模型和增广拉格朗日接触算法进行数值计算,得到了附着面积和压缩量与正压力的关系及接触应力分布、摩擦应力分布和接触状态分布;通过对比,发现仿真正压力与压缩量的关系和实验结果吻合,从而进一步证明了正压力与摩擦力的驱动性能关系的正确性。结果表明,当正压力为2 750 N时,单边最大静摩擦力1 167 N,宏观摩擦因数0.85,附着面积1 909 mm2,压缩量4.6 mm,达到了果园运输作业的静态技术要求,为单轨道新型非线性橡胶辊的设计提供了理论基础。

The driving performance of single-track rubber roller driving device was studied.The test was carried on a test-bed with floating vertical pressure clamping and 2-DOF of opposite torque.The curves of compression,friction and positive pressure were figured out.In order to further analyze the deformation micro status of rubber roller,Mooney-Rivlin model in nonlinear finite element and augmented Lagrangian contact algorithm were utilized in numerical analysis.The relationship among positive pressure,adhesion area and compression was analyzed.The contact stress distribution,friction stress distribution and contact state distribution were also obtained.The simulation results of relationship between positive pressure and compression were found to be accordance with the experimental results,which verified the correctness of driving performance relationship between positive pressure and friction.The results showed that,when the positive press was 2 750 N,the maximum single static friction was 1 167 N,the macroscopic friction coefficient was 0.85,the adhesion area was 1 909 mm2,and the compression was 4.6 mm,which met the static technology demand for orchard transportation.