Identification of impact forces on composite structures using an inverse approach
Identification of impact forces on composite structures using an inverse approach
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DOI：
10.12989/sem.2007.27.4.409
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发表时间：
2007-11
影响因子：
2.2
通讯作者：
H. Fukunaga;N. Hu;S. Matsumoto;Ryu Nishi
中科院分区：
文献类型：
--
作者：
H. Fukunaga;N. Hu;S. Matsumoto;Ryu Nishi
本文提出了一种复合材料结构冲击力的识别方法。在这种方法中，首先建立了力历史与应变响应之间的关系。利用有限元方法建立了传感器的应变响应与冲击力信息之间的传递矩阵。在此基础上，建立了以实测应变响应与数值计算应变响应之差最小为优化目标的优化模型，以求取冲击力历史。力历史的识别采用改进的最小二乘法，对力历史的一阶导数施加惩罚。此外，根据应变响应与力历史的关系，定义了指向力位置的误差向量，并将其用于力位置识别。将上述理论推广到用加速度信息代替应变信息的情况。通过两个实验算例验证了该方法的有效性。计算结果表明，即使在冲击事件引起复合材料内部损伤的情况下，该方法也能很好地解决这一问题。此外，该方法还可用于复合材料结构的实时健康监测。
In this paper, an identification method of impact force is proposed for composite structures. In this method, the relation between force histories and strain responses is first formulated. The transfer matrix, which relates the strain responses of sensors and impact force information, is constructed from the finite element method (FEM). Based on this relation, an optimization model to minimize the difference between the measured strain responses and numerically evaluated strain responses is built up to obtain the impact force history. The identification of force history is performed by a modified least-squares method that imposes the penalty on the first-order derivative of the force history. Moreover, from the relation of strain responses and force history, an error vector indicating the force location is defined and used for the force location identification. The above theory has also been extended into the cases when using acceleration information instead of strain information. The validity of the present method has been verified through two experimental examples. The obtained results demonstrate that the present approach works very well, even when the internal damages in composites happen due to impact events. Moreover, this method can be used for the real-time health monitoring of composite structures.