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黄天立,楼梦麟,任伟新.基于CMDLAC指标和遗传算法的结构损伤定位研究[J].计算力学学报,2009,26(4):529~534

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基于CMDLAC指标和遗传算法的结构损伤定位研究

Structural damage localization based on the CMDLAC and genetic algorithm

投稿时间：2007-08-18

DOI：10.7511/jslx20094014

中文关键词: 损伤定位灵敏度分析遗传算法 CMDLAC指标

英文关键词:damage localization sensitivity analysis genetic algorithm the combined multiple damage location assurance criterion

基金项目:国家自然科学基金(50708113,50678173);中国博士基金(20080430152)资助项目.

作者	单位
黄天立	中南大学土木建筑学院,长沙 410075
楼梦麟	同济大学土木工程防灾国家重点实验室,上海 200092
任伟新	中南大学土木建筑学院,长沙 410075

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中文摘要:

提出了基于综合多损伤定位保证准则(CMDLAC)指标和遗传算法(GA)的结构损伤定位方法。基于结构损伤标量模型,结合灵敏度分析提出了基于频率和振型变化的CMDLAC指标,将损伤识别问题转化为约束优化问题,最后以CMDLAC指标为优化目标函数应用遗传算法求解实现了结构的损伤定位。在考虑测试自由度不完备和测量噪声等因素影响的情况下,对桁架结构损伤的数值模拟分析表明了方法的有效性,验证了CMDLAC指标定位损伤和抵抗噪声的能力,同时指出其具有较强的实际可操作性。

英文摘要:

A damage localization method based on the Combined Multiple Damage Location Assurance Criterion (CMDLAC) and genetic algorithm (GA) is proposed. Based on the damage scalar model and combined with the sensitivity analysis, the CMDLAC based on the change of frequencies and mode shapes between the undamaged and damaged states was proposed. The damage identification problem is transformed to the constrained optimization problem. Applying the genetic algorithm, the damage localization was realized through solving the objective function formulated by the CMDLAC. In the condition of the incompleteness of measured degrees of freedom and the measurement noise, the result of damage numerical simulation of truss model has verified the proposed method. It shows that the CMDLAC has the ability of localizing the damage and resisting noise and it is suitable to engineering practical maneuverability.

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