基于可变摩擦阻尼力的斜拉索半主动控制算法  

SEMIACTIVE CONTROL STRATEGY STUDY ON VIBRATION CONTROL OF STAY CABLES WITH VARIABLE FRICTION DAMPER FORCE

作　　者：王慧萍[1] 孙利民[2] 胡晓伦[1] 

机构地区：[1]东南大学交通学院,南京210096 [2]同济大学土木工程防灾国家重点实验室,上海200092

出　　处：《工程力学》2015年第11期94-99,共6页Engineering Mechanics

基　　金：国家高新技术研究发展专项(863计划)项目006AA11Z120)

摘　　要：通过比较线性粘滞阻尼器和摩擦型阻尼器的耗能,发现斜拉索采用摩擦型阻尼器获得的最大附加阻尼高于相应的线性粘滞阻尼器,进而提出了基于可变摩擦阻尼力的斜拉索半主动控制算法。该算法通过控制阻尼器位置处的拉索位移振幅来实时调节阻尼力,使其始终满足拉索-阻尼器系统的最优阻尼力幅值与最优阻尼器位移幅值的对应关系。按摩擦型阻尼器的方式耗能,系统获得的最大附加阻尼总是高于线性粘滞阻尼器的被动最优控制,且与振动频率无关,可以实现斜拉索的变频率多模态振动控制。最后,分别针对斜拉索的自由振动和简谐强迫振动进行了半主动控制算法的数值模拟,验证了其减振效果。By comparing the energy consumption between a linear viscous damper and a friction damper, it can been found that the maximum modal damping ratio of a cable with the friction damper is larger than that for an optimal passive linear viscous damper. This paper proposed a semiactive control strategy of stay cables with a variable friction damper force. The study shows that the friction force level has to be adjusted in proportion to the cable displacement amplitude at the damper position, and keeps cable＇s vibration to be always in the optimal state when the friction force and the damper displacement are corresponding optimal value. Consequently, the maximum modal damping ratio can be obtained. The semiactive control algorithm is independent of vibration frequency and suitable for the vibration control of multi-modal coupling in the cable. The potential of using semiactive control algorithm to control stay cable vibration has been demonstrated by numerical simulation with several control designs. Either free vibration or harmonic forced vibration of a cable can be effectively reduced.

关 键 词：拉索减振 阻尼器 摩擦阻尼力 半主动控制算法 数值分析 

分 类 号：TU311.3[建筑科学—结构工程]