Real-time displacement monitoring of a composite stiffened panel subjected to mechanical and thermal loads
Real-time displacement monitoring of a composite stiffened panel subjected to mechanical and thermal loads
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DOI：
10.1007/s11012-015-0146-8
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发表时间：
2015-10-01
期刊：
影响因子：
2.7
通讯作者：
Tessler, Alexander
中科院分区：
文献类型：
--
作者：
Cerracchio, Priscilla;Gherlone, Marco;Tessler, Alexander
使用原位应变测量的变形结构形状的实时重建是逆问题，通常称为形状感测。在真实的时间变形的结构形状的知识具有重要的意义，评估应变，应力和故障状态，从而构成了结构健康监测的关键组成部分。此外，形状感测是智能结构的控制和致动所必需的。本文采用有限元逆方法对典型复合材料加筋结构进行了形状传感分析。通过使用一组有限的离散应变数据，iFEM允许位移的全场重建，因此也可以在远离传感器位置的地方进行监测。首先，iFEM的理论框架和制定的三角形，逆壳元进行了简要讨论。然后，提出了一种适用于加筋壳结构的应变传感器结构。静态，动态和热载荷的几个数值结果。该方法的鲁棒性相对于输入误差也进行了研究。结果表明，iFEM是一种可行的方法，复合材料加筋结构的形状传感，具有所需的计算效率，精度和鲁棒性相对于应变测量误差。iFEM形状传感方法是特别有吸引力的，因为它不需要任何关于施加的载荷，弹性材料常数，惯性特性或阻尼特性的信息。
Real-time reconstruction of the deformed structural shape using in situ strain measurements is an inverse problem, commonly called shape sensing. The knowledge of the deformed structural shape in real time has important implications for assessing strain, stress, and failure states, and thus constitutes a key component of structural health monitoring. In addition, shape sensing is required for control and actuation of smart structures. In this paper, shape sensing analyses are carried out for typical composite stiffened structures using the inverse Finite Element Method (iFEM). By using a limited set of discrete strain data, iFEM allows full-field reconstruction of displacements that can thus be monitored also far from sensor locations. First, the iFEM theoretical framework and the formulation of a triangular, inverse shell element are briefly discussed. Then, a general strain-sensor configuration amenable to stiffened shell structures is proposed. Several numerical results are presented for static, dynamic, and thermal loadings. The robustness of the method with respect to input errors is also investigated. It is shown that iFEM is a viable methodology for shape sensing of composite stiffened structures, having the desired computational efficiency, accuracy, and robustness with respect to strain-measurement errors. The iFEM shape-sensing methodology is particularly attractive because it does not require any information regarding applied loading, elastic material constants, inertial properties, or damping characteristics.