Shape sensing is critically important throughout the lifecycle of composite shell structures, including the design, manufacturing, service, retirement, and reuse phases. In the service phase, for instance, shape-based structural integrity assessments can inform maintenance strategies, significantly reducing regular maintenance costs. To achieve high-fidelity shape sensing, a novel approach is proposed for strain acquisition and interpolation in carbon fibre reinforced polymer (CFRP) shell structures, utilizing distributed fibre optic sensing. This method is designed to enhance the performance of the inverse finite element method (iFEM). The approach introduces a new strain acquisition strategy based on distributed fibre optic sensors and a strain interpolation technique leveraging single image super-resolution (SISR). In the strain acquisition process, a fundamental sensing block capable of capturing both normal and shear strain is employed for sensor network design, which can be easily implemented using fibre optic sensors. The goal of this acquisition strategy is to standardize sensor network design and provide a digital representation, offering novel insights into shape reconstruction for different composite shells across various applications. Utilizing the obtained strain field, the SISR-based strain interpolation method generates a displacement field with enhanced spatial resolution through iFEM. Experimental evaluation of the SISR-based interpolation demonstrates its efficacy in capturing high-fidelity displacement fields in both smooth and non-smooth strain regions of CFRP shell structures. The introduction of SISR in strain field interpolation, for the first time, offers a potential solution to the challenge of interpolating non-smooth strain fields, providing a reference for addressing complex strain field interpolation in practical applications.

中文翻译：

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使用分布式光纤传感对复合材料外壳进行形状传感


形状传感在复合壳结构的整个生命周期中至关重要，包括设计、制造、服务、报废和再利用阶段。例如，在服务阶段，基于形状的结构完整性评估可以为维护策略提供信息，从而显著降低定期维护成本。为了实现高保真形状传感，提出了一种利用分布式光纤传感在碳纤维增强聚合物 （CFRP） 壳结构中进行应变采集和插值的新方法。该方法旨在提高逆有限元法 （iFEM） 的性能。该方法引入了一种基于分布式光纤传感器的新应变采集策略和利用单图像超分辨率 （SISR） 的应变插值技术。在应变采集过程中，传感器网络设计采用能够捕获正常应变和剪切应变的基本传感模块，这可以使用光纤传感器轻松实现。该采集策略的目标是标准化传感器网络设计并提供数字表示，为各种应用中不同复合材料壳的形状重建提供新颖的见解。利用获得的应变场，基于 SISR 的应变插值方法通过 iFEM 生成具有增强空间分辨率的位移场。基于 SISR 的插值的实验评估表明，它在 CFRP 壳结构的光滑和非光滑应变区域中捕获高保真位移场的有效性。 在应变场插值中引入 SISR 首次为插值非光滑应变场的挑战提供了潜在的解决方案，为实际应用中解决复杂的应变场插值问题提供了参考。