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力学与实践 ›› 2009, Vol. 31 ›› Issue (2): 50-54.doi: 10.6052/1000-0879-2008-023

• 应用研究 • 上一篇    下一篇

固有频率法评估损伤的阈值研究

王哲 丁桦   

  1. 中国科学院力学研究所,北京 100080
  • 收稿日期:2008-01-07 修回日期:2008-02-25 出版日期:2009-04-08 发布日期:2009-04-08

ESTIMATING THRESHOLDS OF DAMAGES BASED ON NATURAL FREQUENCY METHOD

  • Received:2008-01-07 Revised:2008-02-25 Online:2009-04-08 Published:2009-04-08

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.

关键词: 传递矩阵,固有频率,悬臂梁,损伤识别

Abstract: The damage thresholds obtained by natural frequency method can be used as a criterion to justify the usefulness of practical engineering structure. The natural frequency method consists of analyzing the influential factors of the damage, and a cantilever beam model is taken as an example. Both numerical and theoretical results indicate that, if the frequency measurement error is known, this method can be used to estimate the thresholds, during the early period of damage. The thresholds obtained by this method agree with the numerical results very well.

Key words: transfer matrix, natural frequency, cantilever beam,