基于微型永电磁式涡流阻尼TMD的人行桥模型减振试验研究  

Experimental study on vibration control of a model footbridge by a tiny eddy-current tuned mass damper with permanent magnets

作　　者：汪志昊[1,2] 华旭刚[2] 陈政清[2] 王旭[1] 王朝阳[1] 

机构地区：[1]华北水利水电大学土木与交通学院,郑州450011 [2]湖南大学风工程试验研究中心,长沙410082

出　　处：《振动与冲击》2014年第20期129-132,139,共5页Journal of Vibration and Shock

基　　金：国家自然科学基金资助项目(51308214);河南省教育厅科学技术研究重点项目(13A560711);国家级大学生创新创业训练计划项目(201210078007);华北水利水电大学高层次人才项目(201212)

摘　　要：针对现有结构模型减振实验用调谐质量阻尼器(Tuned Mass Damper,TMD)难以实现TMD刚度与阻尼参数完全分离、阻尼参数试验过程中无法保持恒定且难以调整问题,研制微型永磁式电涡流阻尼TMD。其性能试验与分析结果表明,微型TMD采用电涡流阻尼装置既能确保刚度与阻尼参数的有效分离,亦能实现阻尼参数稳定、简单易调。通过某大跨度人行桥模型一阶横向振动模态自由振动减振实验识别获得结构模态阻尼比及强迫振动减振实验识别获得结构模态阻尼比、结构动力响应放大倍数、结构与TMD运动相位差等,证实微型永磁式电涡流阻尼TMD用于结构模型减振实验的可行性与有效性。Traditional tuned mass damper （TMD）adopted for vibration control model test of civil engineering structures has several obvious disadvantages.It can’t well separate the damping and stiffness components,and the damping coefficients can’t be kept constant during the movement of TMD.In addition,it is difficult to adjust the damping coefficient during the control performance tuning in the test.By performance tests and analysis,it is proved that a developed tiny TMD with eddy-current damping can successfully solve the above problems.The great advantage of the proposed TMD is that its damping ratios can be easily adjusted by changing the thickness of conductor plates.Finally,the model test on lateral vibration control of a footbridge further demonstrates the feasibilities and effectiveness of the developed TMD based on the identification of modal damping ratios of structure subjected to both free vibration and forced vibration excitation,and on the measurement of structural dynamic response magnification as well as the phase between the main structure and TMD in the forced vibration excitation tests.

关 键 词：振动控制 人行桥 调谐质量阻尼器 电涡流阻尼 模态阻尼比 

分 类 号：TU352.1[建筑科学—结构工程]