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

Analysis on shaft critical speed of pumped storage generator set is a complex problem in rotor dynamics under the influences of mechanical, electromagnetic and hydraulic factors. A 3D finite element model of a rotor bearing electromagnetic coupled system for pumped storage generator set was built in SAMCEF ROTOR. The stiffness coefficients of unbalanced magnetic pull, the shaft critical speeds and the modes of vibration were calculated. The effects of the stiffness change of unbalanced magnetic pull in generator, turbine guide bearing and generator guide bearings on the critical speed were also discussed. The results show that the unbalanced magnetic pull increases nonlinearly as the excitation current and rotor eccentricity increase, and decreases the first order lateral critical speed. The lateral critical speed increases with the stiffness of the guide bearings, among which the turbine guide bearing mainly affects the second order critical speed, while the upper and lower generator guide bearing mainly influence the first and third critical speeds.