油茶果分层采摘机构花苞损伤有限元分析及试验

Finite Element Analysis and Experiment on Camellia Bud Damage for Camellia Fruit with Layered Picking Mechanism

针对目前油茶果采摘机花苞损伤率高的问题,设计了一种油茶果分层采摘机构。利用Adams软件对油茶果与胶辊的接触碰撞进行仿真分析,得到油茶果的临界脱落速度为105mm/s;根据油茶花苞的生长特性,建立花苞与胶辊相互作用的有限元模型,在ANSYS Workbench软件中仿真分析了花苞与胶辊的碰撞过程。研究结果表明:在油茶果临界脱离速度条件下,花苞与胶辊发生碰撞接触后等效应力和等效应变的值随着胶辊速度和胶辊直径的增加而增加,随着胶辊间距的增加先增加后减小,且花苞均未与果柄发生分离;分层采摘机构室内试验结果与仿真结果基本吻合,研究结果可为油茶果采摘装置的设计提供参考。

Aiming at the problem of the high damage rate of camellia bud,a layered picking mechanism of camellia fruit was designed.The contact collision between camellia fruit and rubber rollers was simulated and analyzed by Adams software,through which the critical shedding speed of camellia fruit was obtained as 105mm/s.According to the growth characteristics of flower bud,the finite element model of the interaction between camellia bud and rubber rollers in the layered picking mechanism was established.The collision process between camellia bud and rubber rollers was simulated and analyzed by means of ANSYS Workbench software.Simulation results showed that the values of equivalent stress and equivalent strain increased with the speed of rubber rollers and the diameter of rubber rollers,and increased first and then decreased with the distance between rubber rollers,while the camellia bud was not separated from the fruit stalk.The indoor test results are basically consistent with the simulation results.Research results can provide reference for the development of camellia fruit picking device.