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将针对一座大跨斜拉桥的拉索损伤采用多层感知器(MLP)进行损伤定位研究。首先在动力计算基础上定义了损伤模式,通过分析损伤模式发现:由各个损伤位置引起的损伤模式具有本质的不同特征,而损伤程度只是对损伤模式曲线的线性放大;第4,6,7阶频率对拉索损伤不敏感,因而将这3阶从损伤模式中剔除。然后采用trail-error方法设计了一个MLP网络来描述损伤模式的7维映射空间。辨识结果证明:设计合理的MLP可以有效地描述结构的损伤模式,并能正确地进行损伤定位。
A multi-layer sensor (MLP) is applied to the damage location research for the cable damage of a long span cable-stayed bridge. Firstly, the damage model is defined based on the dynamic calculation. By analyzing the damage model, it is found that the damage model caused by each damage location has essential different characteristics, but the damage degree is only linear amplification of the damage model curve. The 4th, The frequency is not susceptible to cable damage, so this 3 orders are removed from the damage mode. Then a trail-error method is used to design an MLP network to describe the 7-D mapping space of damage modes. The identification results show that the well-designed MLP can effectively describe the structural damage model and locate the damage correctly.