Wireless and distributed sensing of the shape of morphing structures
Wireless and distributed sensing of the shape of morphing structures
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DOI：
10.1117/12.658499
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发表时间：
2006-03
期刊：
影响因子：
--
通讯作者：
W. Akl;S. Poh;A. Baz
中科院分区：
文献类型：
--
作者：
W. Akl;S. Poh;A. Baz
监控变形的形状对于它们的有效和安全操作至关重要。然而，目前的传感系统，如光纤传感器是昂贵的，刚性的，不适合监测大的形状变化，而不容易发生故障或性能下降。因此，提出了一种不受这些严重限制的新型传感器。所提出的传感器系统依赖于它的操作上的一个特殊配置的分布式网络的电线，嵌入在这些结构的复合织物。传感器网络的输出被无线传输到控制处理器，以计算变形的整个表面上的线性和角偏转、形状以及应变分布和功率流的图。挠度和形状信息对于确定结构是否正确部署以及其表面是否无磨损至关重要。应变图可确保结构不会承受过度载荷，从而对其使用寿命产生不利影响。而功率流图提供了一种度量，其以模仿生物系统的方式唯一地识别结构健康，该生物系统倾向于重新分配负载并将其路径重定向远离受伤部位。利用非线性有限元理论，建立了梁式变形结构传感器网络的控制方程。由此产生的方程将为传感器提供独特的插值功能，使其能够映射变形结构整个表面上的线性和角偏转和应变场以及功率流分布。在静态和动态负载条件下的传感器网络的理论和实验特性。所获得的结果被用来证明这类新的传感器的优点和潜力，作为一种可行的手段，用于监测1-D变形结构的静态和动态挠度。将拟议的传感器网络与支持电子设备和柔性致动器阵列集成，将能够开发出独立、主动控制和自主操作的新一代变形技术。
Monitoring the shape of morphing is essential for their effective and safe operation. However, current sensing systems such as fiber optic sensors are expensive, rigid, and unsuitable for monitoring large shape changes without being susceptible to failure or performance degradation. Therefore, a new class of sensors that does not suffer from these serious limitations is presented. The proposed sensor system relies in its operation on a specially configured distributed network of wires that are embedded in the composite fabric of these structures. The output of the sensor network is wirelessly transmitted to a control processor to compute the linear and angular deflections, the shape, and maps of the strain distribution and power flow over the entire surface of the morphing. The deflection and shape information are vital to ascertain that the structure is properly deployed and that its surfaces are operating wrinkle-free. The strain map ensures that the structure is not loaded excessively to adversely affect its service life. While the power flow map provides a metric that uniquely identifies the structural health in a manner that mimics biological systems which tend to redistribute the load and redirect its path away from the injured sites. The equations governing the operation of the sensor network are developed for a beam-like morphing structure using the non-linear theory of finite elements. The resulting equations will provide the sensor with its unique interpolation capabilities that make it possible to map the linear and angular deflection and strain fields as well as the power flow distribution over the entire surface of the morphing structure. The theoretical and experimental characteristics of the sensor network are determined under static and dynamic loading conditions. The results obtained are used to demonstrate the merits and potential of this new class of sensors as a viable means for monitoring the static and dynamic deflections of 1-D morphing structures. Integration of the proposed sensor network with the supporting electronics and with arrays of flexible actuators will enable the development of a self-contained, actively controlled, and autonomously operating new generation of morphing.