自走式单轨道山地果园运输机力学仿真与试验

Mechanical simulation and experiment of self-propelled monorail mountain orchard transporter under different racks

为研究自走式单轨道山地果园运输机轨道齿条齿形和工作参数对运输机力学性能的影响,基于动力学理论和Hertz理论的Impact函数模型,建立运输机驱动轮与轨道齿条啮合的虚拟样机模型。选取齿条齿形、轨道坡度、驱动轮转速为评价指标,设计虚拟正交试验,结果显示:影响运输机作业力学性能的主次顺序为齿条齿形>轨道坡度>驱动轮转速,相同条件下链轮齿形齿条性能最优。台架试验结果表明,在轨道坡度分别为+0°、+6°、+12°,驱动轮转速为+88.08rad/s时,驱动轮与链轮齿形齿条啮合时所需扭矩较圆弧齿形齿条分别减少33.82%、33.45%、18.36%,验证了模型仿真分析的正确性。

In order to research the influence of the rack tooth forms and working conditions on the mechanical property of self-propelled monorail mountain orchard transporter,the dynamic models of the transmission system including the driving wheel and racks were established based on the dynamic theory and the Hertz impact-contact theory.Based on ADAMS/View simulation software,the relation of the tooth forms and the torque of the driving wheel which was generated when the driving wheel was engaged with the racks was analyzed and simulated.The orthogonal experiment was carried out using tooth forms,rail gradients and angular velocity as experiment factors and the average torque as assessment index.Range analysis and variance analysis was used to determine the importance index for the torque.The results showed that the order of the primary and secondary impact on the mechanical performance of the transporter is rack tooth profile >track grade >drive wheel speed.Under the same conditions,the sprocket rack has the best performance.Under the condition of the angular velocity of the drive wheel was+88.08 rad/s,the rail gradients were+0°,+6°,+12°,the average torque was decreased by 33.82%,33.45%,18.36%,respectively when the driving wheel was engaged with chain wheel tooth form rack than arc tooth form rack.The correctness of the model simulation analysis is verified,which will provide a reference for the structural optimization design of self-propelled monorail mountain orchard transporter track.