损伤定位中应变模态指标的改进研究

Study on Strain Modal Index Improving in Damage Location

由于传统的应变模态差指标峰值大小随损伤程度而变化,在利用应变模态差指标作为神经网络输入来识别损伤位置时,就很可能产生误判,为消除损伤程度对应变模态差指标的影响,本文对应变模态差指标进行改进,并给予了理论证明,并通过悬臂梁数值仿真算例进行验证。验证结果表明,所建议的改进方法指标与理论研究一致。

Because traditional strain modal index change with damage degree, there is likely to exist miscarriage of justice when it is applied to identify structural damage location for NN input. In order to eliminate the damage degree effect on strain modal errand index, this paper give an improved index of strain modal errand and make theoretic proving. Finally, the results of numerical simulation experiment of cantilever girder show that the improved index has a good agreement with the original index.