Damage Detection in Bolted Space Structures
Damage Detection in Bolted Space Structures
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DOI：
10.1177/1045389x09354785
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发表时间：
2010-02-01
影响因子：
2.7
通讯作者：
Cakan, Hakan
中科院分区：
文献类型：
--
作者：
Doyle, Derek;Zagrai, Andrei;Cakan, Hakan
为了克服目前卫星运行时间表的限制，正在开发快速响应空间卫星，以便进行快速配置和组装。用于组装、集成和验证准备发射和在轨运行的卫星的时间必须减少到一周以内。结构健康监测被视为在发射前实时评估卫星完整性和合格性的一个可能途径。嵌入式超声波和磁机械阻抗（MMI）被认为是潜在的候选人的关键系统元件的诊断。压电晶片主动传感器结合声弹性SHM方法用于评估航空航天结构与螺栓连接。在本分析中，接头的声弹性行为被用作结构完整性的指标。实验数据显示了由于不同的螺栓扭矩而导致的声信号相位的变化。局部化潜力的声弹性技术证明在一个复杂的结构类似于一个典型的卫星面板。MMI方法在评估复杂卫星结构中螺栓连接的状态方面显示出实用性。实验数据揭示了由施加到接头的结构载荷的差异引起的阻抗峰值位置的变化。MMI测量的可重复性进行了评估和光谱能量表示适合MMI诊断的自动化。有人主张，声弹性和MMI方法都表明了卫星螺栓连接损伤检测和表征的可能性。
To overcome the current limitations of satellite operation timelines, responsive space satellites are being developed for rapid configuration and assembly. Time spent for assembly, integrating, and verifying a satellite ready for launch and on-orbit operations must be reduced to less than a week. Structural health monitoring is seen as a possible avenue for real-time assessment of satellite integrity and qualification before launch. Embedded ultrasonics and magneto-mechanical impedance (MMI) are considered as potential candidates for diagnostics of critical system elements. Piezoelectric wafer active sensors in conjunction with acousto-elastic SHM methods are used for assessing aerospace structures with bolted joints. In the present analysis, the acousto-elastic behavior of the joint is used as an indicator of structural integrity. Experimental data show changes in the acoustic signal phase as a result of differing bolt torques. Localization potential of the acousto-elastic technique is demonstrated in a complex structure analogous to a typical satellite panel. The MMI method has shown utility in assessing the condition of bolted joints in complex satellite structures. Experimental data reveal changes in position of impedance peaks induced by the difference in structural loads applied to the joint. Repeatability of the MMI measurements is evaluated and spectral energy representation suitable for automation of MMI diagnostics is suggested. It is advocated that both the acousto-elastic and MMI methods have indicated possibilities for detecting and characterizing damage in satellite bolted joints.