| 索的动刚度与模态参数识别 |
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| 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):93-98. |
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| 作者姓名： | 任伟新 胡卫华 刘浩亮 |
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| 作者单位： | 1. 中南大学土木建筑学院,湖南,长沙410075
2. 福州大学土木工程学院,福建,福州350002 |
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| 基金项目： | 国家自然科学基金
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教育部跨世纪优秀人才培养计划 |
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| 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。
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| 关 键 词： | 索 动刚度 频响函数 模态分析 参数识别 |
| 文章编号： | 1000-4750(2008)04-0093-06 |
| 修稿时间： | 2006年9月18日 |
IDENTIFICATION FOR DYNAMIC STIFFNESS AND MODAL PARAMETER OF CABLES |
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| REN Wei-xin,HU Wei-hua,LIU Hao-liang.IDENTIFICATION FOR DYNAMIC STIFFNESS AND MODAL PARAMETER OF CABLES[J].Engineering Mechanics,2008,25(4):93-98. |
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| Authors: | REN Wei-xin HU Wei-hua LIU Hao-liang |
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| 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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| Keywords: | cable dynamic stiffness frequency response function modal analysis parameter identification |
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