ass日本风韵熟妇pics男人扒开女人屁屁桶到爽|扒开胸露出奶头亲吻视频|邻居少妇的诱惑|人人妻在线播放|日日摸夜夜摸狠狠摸婷婷|制服 丝袜 人妻|激情熟妇中文字幕|看黄色欧美特一级|日本av人妻系列|高潮对白av,丰满岳妇乱熟妇之荡,日本丰满熟妇乱又伦,日韩欧美一区二区三区在线

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.