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

The interaction of soiltillage tool plays a pivotal role in analysis and optimization of the tillage process. The dynamic behavior of soil needs to be developed primarily when studying the soiltillage tool interaction. The simulation of soilrotary blade interaction using distinct element method (DEM) and indoor soil bin experiment were conducted to provide a better understanding of the soil movement. Firstly, DEM model of soilrotary blade interaction was established. Secondly, comparison of experimental results and simulation results were done, positions before and after tillage of surface soil particle were used as soil displacement in simulation, and tracer method was employed to measure soil displacement in experiment. Then, the movement of soil which belongs to different positions was analyzed. The results showed that soil forward and side displacement in experiment increased with increasing rotational speed of blade, the forward displacement was larger than the side displacement. The displacement of shallow soil was the largest, and then middle soil and deep soil had the minimum displacement. The closer the soil to the rotational point was, the larger the forward and side displacement of soil were. For the particles in tillage scope, the percent of particles which moved to the opposite direction were 26.2%, 72.1% and 48.4% for shallow soil, middle soil and deep soil, respectively. Most soil particles moved backward in horizontal direction during tillage process. The direction of side force and side displacement depended on the situation that the soil particle lay in the left or right side of the lengthwise edge axis. If the soil lay in the left side of the lengthwise edge axis, the side displacement was towards the left and vice versa. The soil particle moved downward with the rotary blade at the beginning of soil cutting, and later it slipped from the border of blade and being tossed up. The average error of soil displacement between simulation results and experimental results was 24.9% for soil forward displacement while 15.3% for soil side displacement. The paper studied the macro and meso movement of soil particles during rotary tillage, which is helpful to understand the interaction between rotary blade and soil and develop the mechanism of rotavator design and optimization.