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首页> 外文期刊>Key Engineering Materials >Damage Detection in Composite Structures Based on Optical Fibre Strain Sensing and Finite Element Model Updating
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Damage Detection in Composite Structures Based on Optical Fibre Strain Sensing and Finite Element Model Updating

机译：基于光纤应变传感和有限元模型更新的复合结构损伤检测

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摘要

A prototype system for condition monitoring of composite structures is described that relies on the on-line measurement of dynamic strains in order to detect any deterioration in performance due to the accumulation of damage. Strain data from both long gauge and point optical fibre sensors are employed to update finite element models of the analysed structures. Together with Bragg grating point sensors, an innovative Fabry-Perot interferometric long gauge strain sensor is proposed. The cavity of these sensors consists of a pair of matched Bragg grating reflectors allowing a number of sensors of the desired length to be wavelength multiplexed on a single fibre, with the advantage of minimum intrusivity in composite materials while retaining sensing capability over the whole structure. A heterodyne based demodulation system, tailored for these sensors, has been employed. Gradient based optimisation algorithms have been utilised to update structural Finite Element models based on the output from the fibre optic sensors and strain based modal analyses. These procedures were used to detect the location of areas with known modifications of the stiffness properties in composite structures and showed good results, as the damaged areas have been correctly located. The comparison with results obtained using more conventional updating techniques shows the validity of the dynamic strain data approach in the damage detection field.
机译：描述了一种用于复合结构状态监测的原型系统，该系统依赖于动态应变的在线测量，以便检测由于损伤累积而导致的性能下降。来自长规格和点光纤传感器的应变数据被用于更新所分析结构的有限元模型。与布拉格光栅点传感器一起，提出了一种创新的法布里-珀罗干涉长距离应变传感器。这些传感器的腔体由一对匹配的布拉格光栅反射器组成，该反射器允许将多个所需长度的传感器在单个光纤上进行波长复用，其优点是复合材料的侵入性最小，同时在整个结构上保持了感应能力。已经为这些传感器量身定制了基于外差的解调系统。基于光纤传感器的输出和基于应变的模态分析，基于梯度的优化算法已被用于更新结构有限元模型。这些程序被用来检测复合材料结构中刚度特性发生已知变化的区域的位置，并显示出良好的结果，因为受损区域已正确定位。与使用更常规的更新技术获得的结果的比较表明，动态应变数据方法在损伤检测领域的有效性。

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