基于离散元法的果园开沟刀具的仿真与试验研究

为探究自主研制的果园立式单轴开沟机刀片数量对开沟质量及功耗的影响及刀片在作业过程中受力最大的部位,采用离散元法建立了4刀片刀具开沟过程的仿真模型,并运用转速—扭矩测量平台获得了开沟过程中刀具的真实功耗,得出仿真模型的误差为9.3%,从而验证了离散元法对刀具开沟过程进行模拟的可行性。运用该仿真模型分别对刀片数目为3和5的刀具开沟过程进行了仿真研究,结果表明:当刀片数目为3时刀具的功耗最小,刀片数目为4为时开沟效果最好。通过分析4刀片刀具工作时的受力情况,得知其在工作开始时功耗波动较大,底端刃口处始终受到较大力的作用,因而应对其进行耐磨处理。

Simulation and Experimental Study on the Ditching Tools of Orchard Based on Discrete Element Method

In order to explore the influence of the number of blades on the quality and power consumption of the independently developed Vertical-Single-Shaft Ditching-Fertilizing Machine and the most stressed part of the blade during operation, the discrete element method was used to establish the simulation model of 4-blade tool ditching process. The real power consumption of the cutter during trenching process was obtained by using a rotational speed torque measurement platform, and the results showed that the error of the simulation model is 9.3%, which proves the feasibility of DEM Simulation for tool trenching process. The simulation model was used to simulate the tool ditching process with the number of blades 3 and 5 respectively, and the results showed that the tool has the least power consumption when the number of blades is 3, and the ditching effect is the best when the number of blades is 4. By analyzing the force of the four-blade cutter, it was found that the power consumption fluctuates greatly at the beginning of the work, and the edge at the bottom end is always subjected to a greater force. Therefore, it should be wear-resistant.