固定垄保护性耕作条件下松垄割刀性能对比分析

Comparative Analysis of Three Ridge-loosing Cutters Based on Permanent Raised Bed Conservation Tillage

摘要:

在固定垄保护性耕作体系下，针对宽垄沟灌条件下水分渗透难的问题，基于土壤力学接触模型，设计了平刀、缺口刀和V形刀3种松垄割刀。利用ANSYS软件对其进行有限元静力学分析，施加载荷数值来自于纯剪切与两面楔模型对3种割刀受力进行分析计算，得出割刀的应力分布图和变形云图。结果显示，3种割刀设计强度均满足要求，变形较小。结合层次分析法与功效系数法，以割刀理论受力、作业油耗、土壤体积含水率增量为评价指标，确定使用V形松垄割刀作业的综合效益最高。

Abstract:

In view of poor water lateral infiltration into the centers of wide beds under the system of PRB conservation tillage, three structural kinds of cutters including flat cutter, twoedge cutter and Vshaped cutter were designed respectively based on soil mechanics model. To get strength checking and comparative analysis, ANSYS software was adopted to analyze the cutters. The stress of the cutters applied was calculated based on pureshear and twowedge models, and got the stress pattern and deformed shape. The results showed that all of these cutters’ strength met the demand, and deformed shape was very small. With AHP and effect coefficient methods, and using theoretical resistance, operation fuel consumption and soil moisture as evaluation indexes, Vshaped cutter was found to be the most suitable considering the integrated benefits.