Structural health monitoring of an advanced grid structure with embedded fiber Bragg grating sensors
Structural health monitoring of an advanced grid structure with embedded fiber Bragg grating sensors
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DOI：
10.1177/1475921707081967
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发表时间：
2007-12-01
影响因子：
6.6
通讯作者：
Ozaki, Tsuyoshi
中科院分区：
文献类型：
--
作者：
Amano, Masataro;Okabe, Yoji;Ozaki, Tsuyoshi
重点研究了碳纤维增强塑料(CFRP)先进网架结构(AGS)结构健康监测系统的构建。AGS通常应用于航空航天结构，因为加强筋只承担碳纤维方向的轴向力，从而使AGS结构有效且重量轻，而且AGS组成中的许多加强筋重复可产生损伤容限。单个肋骨的破坏几乎不会影响整个结构的断裂，使AGS成为一种故障安全结构。在这项研究中，作者将多路光纤布拉格光栅(FBG)传感器沿纵向嵌入AGS肋骨中，以测量所有肋骨的机械应变，以检测AGS肋骨骨折的存在和区域。监测肋骨纵向应变的变化是对AGS最有效的SHM系统。为了证实这一提议，作者探索了以下几点。首先，研究了低速冲击载荷下的各种损伤特征，验证了部分肋裂纹是AGS中最典型的损伤。然后制作了埋入FBG传感器的AGS，验证了SHM系统能够测量所有肋骨的应变。随后，解析地确定了纵筋应变的变化是最适合进行损伤识别的力学特征。此外，还将统计离群点分析引入到结构健康监测系统中，实现了损伤的自动检测。最后，利用SHM系统建立了AGS，并进行了实验验证。结果表明，该系统可以检测出AGS中损伤的存在和损伤区域。
The authors focus on the construction of a structural health monitoring (SHM) system with an advanced grid structure (AGS) made of carbon-fiber reinforced plastic (CFRP). AGS is often applied to aerospace structures because the ribs carry only axial forces in the carbon fiber direction, making AGS structurally effective and lightweight, and because the repetition of many ribs in the AGS composition results in damage tolerance. The failure of a single rib hardly affects the fracture of the whole structure, making AGS a fail-safe structure. In this research, the authors have embedded multiplexed-fiber Bragg grating (FBG) sensors into an AGS rib in the longitudinal direction to measure mechanical strains of all ribs in order to detect the existence and regions of AGS rib fractures. Monitoring the change in rib-longitudinal strains is the most effective SHM system for AGS. To confirm the proposal, the authors explore the following. First, various damage characteristics under low-velocity impact loading are investigated and it is verified that partial rib cracks are the most typical damage in AGS. An AGS is then fabricated with embedded FBG sensors and verified that the SHM system is able to measure all rib strains. Subsequently, it is analytically determined that the change in longitudinal-rib strains is the most appropriate mechanical feature for damage detection. Moreover, a statistical outlier analysis is introduced into the SHM system for automatic damage detection. Finally, AGS is established with the SHM system and verified experimentally. Results confirm that the existence of damage and its regions in AGS can be detected with the proposed SHM system.