噪声影响下基于改进损伤识别因子和遗传算法的结构损伤识别

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振动与冲击 ›› 2012, Vol. 31 ›› Issue (21) : 168-174.

论文

噪声影响下基于改进损伤识别因子和遗传算法的结构损伤识别

黄民水1,2 , 朱宏平2

作者信息 +

Structural damage identification Based on Improved damage identification Factor and Genetic Algorithms under Noises

HUANG Minshui 1,2, ZHU Hongping2

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文章历史 +

摘要

提出了一种考虑噪声影响的基于改进损伤识别因子和遗传算法的结构损伤识别方法。首先，介绍了结构损伤识别的参数化思想，并提出了一种考虑不同模态信息和权重系数的损伤识别因子。然后，在选择算子、交叉算子、变异算子以及自适应交叉和变异等方面对遗传算法进行了改进，并在无噪声情况下，对一简支梁和连续梁进行了损伤识别，识别效果非常好，验证了方法的正确性和有效性。随后，分别考虑了随机噪声和高斯白噪声对简支梁进行损伤识别，发现该方法在噪声水平不是很高的情况下，识别效果很好。最后，在一钢框架基准有限元模型基础上，考虑了四种损伤工况进行了损伤识别，识别结果较好，该方法能够很好地应用于结构的损伤识别和健康监测。

Abstract

A Structural damage identification method is presented in the paper, which is based on improved damage identification factor and genetic algorithms under noises. Firstly, parametrization for damage identification is introduced, and a new damage identification factor is presented, where different modal messages and weight coefficients are considered. Secondly, Genetic algorithms are improved in several aspects: selection operator, crossover operator and mutation crossover, at the same time, adaptive crossover and adaptive mutation are investigated. And damage identification is performed for a simply supported beam and a continuous beam without the influence of noise, the performance is very well and the validity of the method is verified. Then, two types of noises, random noise and white Gaussian noise, are considered for the simply supported beam, it can be seen that identification performance is well when the noise level is not very high. In the end, based on the baseline finite element model of a steel frame, damage identification is carried out under four damage cases, it can be seen that the performance is excellent, the method can be used in damage identification and health monitoring.

导出引用

黄民水;;朱宏平. 噪声影响下基于改进损伤识别因子和遗传算法的结构损伤识别[J]. 振动与冲击, 2012, 31(21): 168-174

HUANG Minshui; ZHU Hongping. Structural damage identification Based on Improved damage identification Factor and Genetic Algorithms under Noises[J]. Journal of Vibration and Shock, 2012, 31(21): 168-174