Qualitative and Quantitative Identification of Structural Damages Based on Stiffness Index and Frequencies
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摘要: 为解决结构多损伤位置识别和损伤程度判定问题,提出了一种基于刚度指标和频率数据的定性和定量识别方法,并分析了测量误差的影响.借鉴柔度损伤指标的方法,用刚度指标对损伤位置进行初步判定,并采用统计理论分析其测量误差的影响;然后利用频率测量精度较高的优势,采用频变法对结构损伤进行定量识别.为进一步提高识别的精度,提出了频变法的迭代改进策略.仿真结果表明,采用刚度指标可以有效地识别出可能的损伤单元,该指标明显优于柔度指标,且受测量误差的影响较小,而利用频变法的迭代改进策略可以得到更精确的损伤程度的量化值.Abstract: In order to identify structural damage locations and extents,a qualitative and quantitative identification method based on stiffness index and frequencies was proposed,and the effect of measurement noise on damage identification was investigated.Firstly,with this method,a stiffness index is used to localize damages,and the statistical theory is applied to analyze the effect of measurement noise of stiffness.Secondly,the frequency change method is used to identify damage extents quantitatively because of the high measurement accuracy of frequencies.In order to raise the identification precision of structural damages,an improved iteration strategy of the frequency change method was proposed.The simulation results show that the stiffness index is better than the flexibility index to structural damage identification and the improved iteration strategy is superior to the frequency change method in the identification precision.
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Key words:
- damage identification /
- stiffness index /
- frequency /
- iteration /
- measurement noise
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