【摘要】 针对模式识别最关键的两个环节:特征提取和分类器设计,提出了基于独立分量分析(ICA)和支持向量机(SVM)的损伤识别集成算法,首先应用ICA方法计算独立源信号和混合矩阵[A],利用混合矩阵与模态振型的对应关系,得到振型矩阵[Φ],将模态振型的变形矩阵[Φ]*作为特征参数输入至SVM分类器进行损伤识别,在冲击载荷作用下,对钢框架结构模型进行了振动试验,结果表明:ICA方法提取的模态振型是一种高效的损伤特征参数,基于ICA和SVM的集成算法能够成功识别结构损伤、损伤位置和损伤程度,从而为结构健康监测提供了一种行之有效的损伤识别方法。更多还原

【Abstract】 In order to extract the sensitive feature and design the effective classifier,this paper presents a novel approach to detect structural damage based on combining independent component analysis(ICA)extraction of modal shape and support vector machine(SVM).A new modal shape[Φ]*from ICA technique,represented by reshaping the mixing matrix[A],is employed as extracted feature to build multiple SVMs.The methodology is applied to steel frame structure with measured time histories from 13 accelerometers.The experiment results show that the proposed method can succeed not only in detecting the structural damage but also in estimating its location and extent,consequently providing an effective technology for structural damage detection.更多还原