不对称模态密频结构的主动控制

Active Control of Structures with Closely Space Natural Frequencies and Unsymmetrical Modes

摘要:

分析了具有不对称模态的密频结构在脉冲荷载作用下，采用单主动质量阻尼器(AMD)和双AMD在速度和状态反馈下进行主动控制时，两个密集频率模态之间的模态阻尼比的分布规律；通过构建采用具有密集频率的斜拉桥模型并进行了主动控制试验，通过模态分析将试验结果和理论分析结果进行了对比验证，结果显示了较好的吻合程度.

Abstract:

The structure with closely spaced natural frequencies and unsymmetrical modes is analyzed under pseudo impulses installed with one or two active mass damper (AMDs). The distribution of the implemental damping ratios of different modes is evaluated under state and velocity feedbacks. An experimental model of cable stayed bridge with closely spaced natural frequencies is build up to verify the theoretical results under control. Modal analysis show that the experimental results agree well with the theoretical results of modal parameters including frequencies and modal damping ratios.