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 the planetary gear transmission system, each gear-teeth cannot be arbitrary positive integers, which are subjected to drive ratio, matching and coaxial requirements. The module of gear only can take certain discrete values for the limit of national standards. It is difficult to obtain the valid solution with the classical restrictions random (CRR) optimization method based on mathematics plan theory. A discrete variables intelligent optimization method with simulation annealing algorithm was presented. The mathematical model of optimization design for two-stage 2Z-X epicyclic gearing was established and an example was presented subsequently. Compared with the CRR method, this method can obtain the global optimal solution more easily and quickly and can be used in engineering design without any post-treatment.