A new approach for health monitoring of composite structures through identification of impact force
A new approach for health monitoring of composite structures through identification of impact force
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DOI：
10.2978/jsas.17.82
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发表时间：
2005-03
期刊：
影响因子：
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通讯作者：
N. Hu;H. Fukunaga
中科院分区：
文献类型：
--
作者：
N. Hu;H. Fukunaga
本文针对复合材料结构，提出了一种冲击力的识别方法。基于有限元法，首先建立了力历程与应变响应之间的关系。根据该关系，定义了指示力位置的误差向量，并将其用于力位置识别。其次，力历史的识别与修改后的最小二乘法，对力历史的一阶导数施加惩罚。通过内嵌PZT压电传感器的CFRP层合板的冲击试验，验证了该方法的有效性。基于有限元模型，讨论了利用所得到的冲击力历史和冲击力位置预测材料内部损伤的可能性，说明该方法可用于复合材料结构的实时健康监测。
In this paper, for composite structures, an identification method of impact force is proposed. Based on the finite element method (FEM), the relation between force histories and strain responses is first formulated. From this relation, an error vector indicating the force location is defined and used for the force location identification. Next, the identification of force history is performed with the modified least-squares method that imposes the penalty on the first derivative of the force history. The validity of the present method has been verified through the impact experiment of CFRP laminated plates embedded with PZT piezoelectric sensors. Based on a FEM model, the possibility of employment of the obtained impact force history and impact force location for the prediction of material internal damages is discussed, which illustrates that this method can be used for the real-time health monitoring of composite structures.