| 固有频率法评估损伤的阈值研究 |
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| 引用本文： | 王哲, 丁桦. 固有频率法评估损伤的阈值研究[J]. 力学与实践, 2009, 31(2): 50-54. doi: 10.6052/1000-0879-2008-023 |
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| 作者姓名： | 王哲 丁桦 |
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| 作者单位： | 1. 中国科学院力学研究所,北京 100080; 2. 中国科学院力学研究所 |
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| 摘 要： | 通过分析损伤可测性的影响因素，对固有频率法判断损伤阈值的估算方法进行了研究，并以悬臂梁模型为例，应用该方法研究了悬臂梁的损伤阈值. 数值及理论计算的结果表明：在已知频率测量精度及方法偏差时，该方法可以判别固有频率法损伤识别的阈值，在早期损伤阶段，该方法判别的阈值与数值模拟结果吻合良好.
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| 关 键 词： | 传递矩阵 固有频率 悬臂梁 损伤识别 |
| 收稿时间： | 2008-01-07 |
| 修稿时间： | 2008-02-25 |
ESTIMATING THRESHOLDS OF DAMAGES BASED ON NATURAL FREQUENCY METHOD |
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| ESTIMATING THRESHOLDS OF DAMAGES BASED ON NATURAL FREQUENCY METHOD[J]. Mechanics in Engineering, 2009, 31(2): 50-54. doi: 10.6052/1000-0879-2008-023 |
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| Authors: | WANG Zhe DING Hua |
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| Affiliation: | 1;2;Division of Engineering Sciences;Institute of Mechanics;Chinese Academy of Sciences;Beijing 100190;China |
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| Abstract: | The damage thresholds obtained by natural frequency method can be usedas a criterion to justify theusefulness of practical engineering structure. The natural frequency methodconsists of analyzing the influential factors of the damage, and acantilever beam model is taken as an example. Both numerical and theoretical results indicate that, if thefrequency measurement error is known, this method can be used toestimate the thresholds, during the early periodof damage. The thresholds obtained by this method agree with the numerical resultsvery well. |
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| Keywords: | transfer matrix natural frequency cantilever beam damage identification |
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