永磁调节式磁流变阻尼器在拉索减振中的应用研究

斜拉桥拉索易发生风雨振动,在拉索上安装磁流变阻尼器是一种有效的减振措施.基于洞庭湖大桥拉索减振系统升级改造工程,对永磁调节式磁流变阻尼器进行了力学性能试验,得到了该磁流变阻尼器在不同档位、频率和振幅工况下的滞回曲线,计算了不同档位下的等效阻尼系数,评估了拉索安装阻尼器后获得的实际阻尼比.结果表明,安装永磁调节式磁流变阻尼器后满足拉索减振要求.永磁调节式磁流变阻尼器已成功应用于岳阳洞庭湖大桥,解决了该桥严重的风雨致振动问题.

Application Permanent Magnetism Adjustable Magnetorheological Damper to Cable Vibration

Wind-rain vibration of stay-cables is easy to occur. The magnetorheological damper installed on the cable is a kind of effective vibration reduction measures. Based on Dongting Lake Bridge cable vibration reduction system upgrade project, permanent magnet adjustable magnetorheological damper for the mechanical properties test have been carried out with MTS-810 servo test machine, of the magnetorheological damper in different gear, frequency and amplitude is achieved ; The hysteresis curve the equivalent damping coefficient under different gear is calculated;and the cable actual damping ratio after installation of dampers is evaluated. The result shows that the installation of the permanent magnet adjustable magnetorheological damper satisfies the requirement of vibration reduction. The permanent magnet adjustable magnetorheolog- ical dampers have been successfully applied to Yueyang Dongting Lake Bridge, solving the bridge vibration problem caused by severe wind and rain.