摘要
DTMD是一种新型的具有双频率的调谐质量阻尼器,与普通TMD相比,可以同时实现对主梁竖向和扭转振动的控制,具有较高的控制效率,但DTMD与TMD相似,控制效率对参数失调较敏感。基于Scanlan多模态耦合抖振理论,提出桥梁多模态耦合抖振多重DTMD控制理论,列式中考虑了多模态参与作用和模态间气动耦合效应,并编制了多重DTMD抖振控制和参数分析程序。最后以一座斜拉桥为算例,研究了多重DTMD的制振性能,讨论了多重DTMD频率带宽、DTMD个数和阻尼比等参数对控制效率的影响,并对多重DTMD的设计提出建议。
DTMD is a tuned mass damper with dual frequencies. It can simultaneously reduce the vertical and torsional vibration of the bridge deck, so it has higher reduction efficiency compared to the conventional tuned mass damper. However, the reduction efficiency of the DTMD is sensitive to fluctuation in the parameters of the DTMD, which is very similar to the case of the conventional tuned mass damper （TMD）. Based on multimode coupled buffeting theory, the buffeting control theory of multiple tuned mass dampers with dual frequencies （multiple DTMDs） is established in this paper. Multimode participation and aerodynamic coupling among modes are all taken into account in the formulation. A program for buffeting control and parametric study is also developed. A parametric study of a cable-stayed bridge is performed to investigate the vibration suppression characteristics of the multiple DTMDs. The effects of frequency bandwidth, the total number of the multiple DTMDs and the damping ratio of each DTMD on the multiple DTMDs are also discussed. Some advice for design of multiple DTMDs is also proposed.
出处
《工程力学》
EI
CSCD
北大核心
2006年第1期74-80,共7页
Engineering Mechanics
关键词
大跨度桥梁
多重DTMD
制振
抖振控制
多模态耦合抖振
long-span bridge
multiple tuned mass dampers with dual frequencies
vibration suppression
buffeting control
multimode coupled buffeting
