| 基于有限元模型和模态参数的损伤识别 |
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| 引用本文： | 王树青,张韶光,李华军.基于有限元模型和模态参数的损伤识别[J].中国海洋大学学报(自然科学版),2003,33(4):650-656. |
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| 作者姓名： | 王树青 张韶光 李华军 |
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| 作者单位： | 1. 中国海洋大学工程学院,青岛,266003
2. 胜利油田海洋石油开发公司,东营,257237 |
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| 基金项目： | 国家高技术研究发展计划 (86 3)项目 (2 0 0 1AA6 0 2 0 2 3)资助 |
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| 摘 要： | 本文从特征值问题出发 ,结合结构系统的有限单元模型并引入单元损伤因子 ,导出了求解单元损伤因子的方程 ,从而可以确定结构的损伤位置和损伤程度。利用简支梁进行了数值模拟 ,建立了简支梁的有限单元模型 ,用不同单元弹性模量的降低来模拟各种不同的损伤工况 ,并对每种工况进行了损伤位置和损伤程度识别 ,数值模拟结果同实际情况吻合很好。
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| 关 键 词： | 损伤识别 有限元模型 模态参数 振型扩展 |
| 文章编号： | 1001-1862(2003)04-650-07 |
| 修稿时间： | 2002年10月29 |
Damage Detection Based on a Finite Element Model and Modal Parameter Estimation |
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| Wang Shuqing,Zhang Shaoguang,Li Huajun.Damage Detection Based on a Finite Element Model and Modal Parameter Estimation[J].Periodical of Ocean University of China,2003,33(4):650-656. |
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| Authors: | Wang Shuqing Zhang Shaoguang Li Huajun |
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| Institution: | Wang Shuqing1 Zhang Shaoguang2 Li Huajun1 |
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| Abstract: | The element damage equations have been established by the eigenvalue equations that characterize the dynamic behavior of the structure. Using a damage index charactering the stiffness reduction combined with a finite element model, one can locate and evaluate the damage. Numerical simulation of a simple beam is demonstrated to verify the method. The different damage scenarios are simulated by decreasing the elastic modulus of different elements of the beam. Three simulated damage scenarios which cover one element damage, two elements damage and multiple elements damage. The results of simulation demonstrated that one can find the exact locations and severity of damage for the simple beam. |
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| Keywords: | damage detection finite element model modal parameters mode shape expansion |
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