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基于盲源分离的损伤识别方法

, PP. 158-163

Keywords: 损伤识别,盲源分离,环境因素,温度效应,AMUSE

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Abstract:

考虑环境因素和结构运行状态的损伤识别方法,在结构健康监测中越来越受到人们的关注。本文利用监测中提取的结构振动特征,提出基于盲源分离的损伤识别算法。该算法通过盲源分离中的AMUSE法可以将信号分为环境源和损伤源,其优点是不需要测量环境因素即可去除环境源影响。当结构处于健康状况时,结构损伤源信号很小;但当损伤发生后,该源会急剧增大。以预应力混凝土梁作为数值算例对该方法进行验证,温度作为影响结构反应的环境条件,且温度与结构特征参数具有非线性关系,算例成功地剔除了环境因素的影响,增大了结构损伤识别预警的准确性。

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