磁流变阻尼器与拉索振动控制研究

磁流变阻尼器是一种新型智能装置,具有阻尼力连续逆顺可调并且可调范围大、良好的温度稳定性以及很好的耗能减振等特点,因而在拉索振动控制中较其它阻尼器具有显著的优势.本文总结介绍了自2000年以来应用磁流变阻尼器抑制拉索振动方面的主要研究成果.进行了拉索-磁流变阻尼器系统的减振性能仿真研究,得到了拉索模态阻尼比与阻尼器安装高度、输入电压等参数的关系,提出了应用磁流变阻尼器进行拉索振动控制的数学模型和工程实用设计方法.开展多次现场试验研究,全面评估了磁流变阻尼器的实际减振性能.开发了磁流变式拉索减振新技术,并已于2002年在岳阳洞庭湖大桥全桥实施.作者发明了一种永磁调节式磁流变阻尼器,解决了供电无保证时磁流变阻尼器的应用问题;并将其应用于长沙洪山大桥的拉索减振.近4年来显示了磁流变阻尼器对拉索良好的减振效果.

Study of the cable-MR damper system vibration control

Magnetorheological(MR) damper is one of the more promising new devices for suppressing cables vibration as it possesses a significant adjustable damping force,temperature insensitivity and the large capacity of energy dissipation.Cables vibration control issue are investigated and some important conclusions are listed in this peper.Numerical simulations for dynamic characteristics of the cable-MR damper system are conducted.Relationships of the first three modal damping ratios versus height attaching damper to cable,voltage applied to damper are acquired for cases of single damper and two dampers.The optimal voltage model and the practical design method of cable-MR damper system are presented.Field tests are also conducted and the practical effects of mitigating cable vibration with MR dampers are evaluated.A new technique of suppressing cables vibration using MR damper is developed.The technique has been implemented on Dongting Lake Bridge in the year of 2002.The adjustable permanent magnet MR(APM-MR) dampers are developed and they are implemented on cables of the Hongshan cable-stayed bridge.The excellent mitigation efficiency of MR dampers has been verified with near 4 years operation.