任伟新, 胡卫华, 刘浩亮. 索的动刚度与模态参数识别[J]. 工程力学, 2008, 25(4): 93-098.
引用本文: 任伟新, 胡卫华, 刘浩亮. 索的动刚度与模态参数识别[J]. 工程力学, 2008, 25(4): 93-098.
REN Wei-xin, HU Wei-hua, LIU Hao-liang. IDENTIFICATION FOR DYNAMIC STIFFNESS AND MODAL PARAMETER OF CABLES[J]. Engineering Mechanics, 2008, 25(4): 93-098.
Citation: REN Wei-xin, HU Wei-hua, LIU Hao-liang. IDENTIFICATION FOR DYNAMIC STIFFNESS AND MODAL PARAMETER OF CABLES[J]. Engineering Mechanics, 2008, 25(4): 93-098.

索的动刚度与模态参数识别

IDENTIFICATION FOR DYNAMIC STIFFNESS AND MODAL PARAMETER OF CABLES

  • 摘要: 索的动刚度描述动态过程索的荷载与变形的关系,是索本身固有特性的描述。从考虑垂度影响的索的动刚度解析解出发,提出了适用索模态参数是不相应的简化解。试验得到了索的频响函数,采用最小二乘拟合的方法,应用推导的索动刚度简化解,识别出了索的各阶频率和阻尼比。

     

    Abstract: The cable dynamic stiffness describes the load-deformation behavior of cables subjected to dynamic loading. It represents the intrinsic dynamic properties of cables. For the purpose of identification for cable modal parameter, the simplified cable dynamic stiffness is proposed based a closed-form expression of dynamic stiffness taking cable sag into account. A series of cable modal tests were conducted in the laboratory with different cable tension levels and corresponding frequency response functions were obtained. Based on the proposed simplified cable dynamic stiffness and measured frequency response functions, the cable frequencies and damping ratios have been successfully identified by using a least square curve fitting technique. Subsequently, a new method to estimate the modal parameters of cables is established.

     

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