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

Using parametric design of SolidWorks, three-dimensional solid models of all parts of 9YG-130 double disc mower cutter were built, and the design of virtual prototype was completed by constraint assemble. Introducing the models to the dynamic analysis software ADAMS, the motion simulation was performed, and the trajectory of the cutter vertex was obtained when setting the forward speed of the cutter with 2.78m/s, and rotation speed with 2000r/min. The virtual orthogonal experiment with three levels and four factors was conducted, and Design-Expect 8.0 software was used to complete analysis of variance. The results showed that the repeat cut ratio of the cutter was effectively reduced when the four factors were vg=57.01m/s, vj=2.76m/s, h=34.06mm, and m=3. The actual prototype experiment results showed that the experiment design met the mower requirements for grass industry technology, and improved efficiency and accuracy of the design.