高速犁体曲面结构参数对耕作阻力的影响研究

针对我国铧式犁高速作业时耕作阻力大、耕地质量差等问题,本文研究了高速犁体曲面结构参数对耕作阻力的影响.首先,分析了基于水平直元线法的高速犁体曲面形成过程,得出对高速犁体曲面作业性能影响较大的结构参数.然后,基于离散元法建立了高速犁体曲面-土壤互作模型,并通过土槽试验和仿真试验验证了该模型的合理性.最后,分别研究了铧刃角θ、导曲线开度l、犁铧安装角ε和高度偏差量ΔH等结构参数对耕作阻力的影响规律.研究结果表明：随着铧刃角的增大,耕作阻力以较快速度增大；随着导曲线开度的增大,耕作阻力逐渐减小；随着犁铧安装角的增大,耕作阻力在较小范围内波动；随着高度偏差量的增大,耕作阻力缓慢增大.

Effect of Structural Parameters of Plow Body Surface on Tillage Resistance

In response to the problems of high tillage resistance, high energy consumption and poor tillage performance during high speed operation of the plow in China, this paper investigates the structural parameters of the high speed plow body surface on tillage resistance. First, the formation process of high speed plow body surface based on the horizontal straight element line method is analyzed, and the structural parameters that have a great influence on the operational performance of high-speed plow body surface are derived. Then, based on the discrete element method, a dual soil layer structure containing a tillage layer and a plow base layer is established, and the soil properties and the interaction between the plow surface and the soil are characterized by suitable contact relations and contact parameters, and then a high speed plow surface soil interaction model is established. The rationality of the high speed plow body surface soil interaction model is demonstrated through soil flume tests and simulations of plowing operations. Finally, the influence of structural parameters such as share edge angle θ, guide curve opening l, plowshare mounting angle ε and height deviation amount ΔH on tillage resistance are studied respectively. The results show that the tillage resistance increases at a faster rate as the angle of the share blade increase; as the opening of the guide curve increases, the tillage resistance decreases gradually; as the ploughshare mounting angle increases, the tillage resistance fluctuates within a small range; the tillage resistance increases slowly as the height deviation increases. The results of this paper can provide a significant reference for the structural optimization design of high speed plow surfaces.