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

To improve damping force and reduce response time of magnetorheological (MR) damper, an optimal structure designing method was presented. The structure optimal methods, including reverse series of excitation coils and composed permanent magnets piston structure, was based on the calculation of resultant magnetic field for different excitation coil winding approachs. According to the provided structure optimal method, a MR damper was manufactured and its mechanical performances were tested on type DS-100 fatigue-testing machine with different forcing vibration frequency, vibration amplitude and control current. The experiments showed that the damping force of the proposed MR increased by 65%, and the response time reduces to more than a half at the most. This result provided an important reference to further mechanical property improvement of MR damper.