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 order to solve the high vibration and energy dissipation of rotary grading screen, the system energy of the rotary grading screen in operation process was analyzed. The total energy of system in operation process was periodic, and it caused the high vibration and energy dissipation of the rotary grading screen. A method based on the constant total energy of system was proposed and the elastic component was disposed. It transformed dissipated energy into elastic potential energy and transformed elastic potential energy into driving energy so as to remain the constant total energy of system. The experimental results showed that the proposed method saved energy consumption by 21.71% and decreased vibration by 30.89%. It had better effect in energy saving and vibration decreasing.