期刊
MATERIALS
卷 12, 期 7, 页码 -出版社
MDPI
DOI: 10.3390/ma12071021
关键词
non-destructive evaluation; structural damage; natural frequency; singular value truncation; multiple feedbacks; data noise
类别
资金
- National Natural Science Foundation of China [[11202138,41772311]]
- Zhejiang Provincial Natural Science Foundation of China [LY17E080016]
As natural frequencies can be easily and accurately measured, structural damage evaluation by frequency changes is very common in engineering practice. However, this type of method is often limited by data, such as when the available natural frequencies are very few or contaminated. Although much progress has been made in frequency-based methods, there is still much room for improvement in calculation accuracy and efficiency. To this end, an enhanced singular value truncation method is proposed in this paper to evaluate structural damage more effectively by using a few lower order natural frequencies. The main innovations of the enhanced singular value truncation method lie in two aspects: The first is the normalization of linear systems of equations; the second is the multiple computations based on feedback evaluation. The proposed method is very concise in theory and simple to implement. Two numerical examples and an experimental example are employed to verify the proposed method. In the numerical examples, it was found that the proposed method can successively obtain more accurate damage evaluation results compared with the traditional singular value truncation method. In the experimental example, it was shown that the proposed method possesses more precise and fewer calculations compared with the existing optimization algorithms.
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