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| Harmonic identification of cracks parameters in beams |
| Received:May 26, 2015 Revised:August 30, 2015 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7511/jslx201605002 |
| KeyWord:cracked beam amplitude crack parameters harmonic excitation robustness |
| Author | Institution |
| 陈岩 |
大连理工大学 工程力学系 工业装备结构分析国家重点实验室, 大连 |
| 芦旭 |
大连理工大学 工程力学系 工业装备结构分析国家重点实验室, 大连 |
| 张宇航 |
大连理工大学 工程力学系 工业装备结构分析国家重点实验室, 大连 |
| 关振群 |
大连理工大学 工程力学系 工业装备结构分析国家重点实验室, 大连 |
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| Abstract: |
| A method of crack identification is presented based on amplitude changing after analyzing the dynamic characteristics of cracked beams under harmonic excitation.Firstly,a breathing crack model was introduced to establish a 2-D finite element model of cantilever beam with a crack.It is pointed out that the amplitude is always a significant signal under any excitation and can be used to describe the dynamic characteristics of cracked beams.Secondly,it was found that the amplitudes change differently with crack parameters when the exciting frequency is a quarter of first-order and second-order nature frequency of beams with no cracks.So the amplitude is proposed to detect the crack parameters in beams.Then,the amplitude surface is plotted by adopting surface fitting technology.Through identification of a cracked beam with unknown parameters,the method is proved to be effective.Finally,considering that the nature frequency of a beam with no cracks is calculated inaccurately,the robustness of this method is analyzed.The result shows that this method can detect the crack parameters even though the max error is 10%. |
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