Quantitative Structural Health Monitoring for Damage Detection

结构健康监测的目标是将一个或多个测量系统嵌入到飞机或桥梁等结构中，以提供结构在服役期间的当前状态信息。在本提案中，重点放在检测结构局部损坏的系统上，无论是由于退化(例如疲劳、腐蚀)还是意外的外部事件(例如撞击)。SHM的替代方法是使用无损评估(NDE)技术来检测这种损伤，这种技术通常需要传感器扫描结构。与无损检测相比，SHM的吸引力在于降低了检查成本，并减少了与检查相关的结构“停机时间”。然而，要想让SHM系统取代无损检测程序，SHM系统必须能够在对所有感兴趣的位置的损伤敏感性方面表现出同等或更好的量化性能。用于损伤检测的SHM系统没有从研究实验室进入工业的一个关键原因是因为可量化性能的问题没有得到令人满意的解决。需要有可量化的绩效是本奖学金申请中提出的所有工作的基础。确定了两个子项目，这将导致一个综合的SHM系统，该系统在主动和被动模式下使用导波进行损害检测。第三个子项目涉及提供既适用于主动探测又适用于被动探测的通用性能校准战略的关键问题。该奖学金的总体目标是提供科学的前进方向，使用于损伤检测的SHM系统实现从实验室到工业的过渡。

The objective of structural health monitoring (SHM) is to embed one or more measurement systems into a structure, such as an aeroplane or bridge, that can provide information on the current condition of the structure while it is in service. In this proposal the emphasis is on systems to detect localised damage to a structure, whether due to degradation (e.g. fatigue, corrosion) or unexpected external events (e.g. impacts). The alternative to SHM is to detect such damage using non-destructive evaluation (NDE) techniques that usually require a sensor to be scanned over the structure. The attraction for SHM over NDE is the reduction in inspection cost and the structural 'down-time' associated with inspection. However, for an SHM system to supersede an NDE procedure it is necessary for the SHM system to be able to demonstrate quantifiably equal or superior performance in terms of sensitivity to damage at all locations of interest. A key reason why SHM systems for damage detection have not progressed from research laboratories into industry is because the issue of quantifiable performance has not been satisfactorily addressed. The need to have quantifiable performance underpins all the work proposed in this Fellowship application. Two sub-projects are defined that will lead to an integrated SHM system that uses guided acoustic waves in both active and passive modalities for damage detection. A third sub-project addresses the key issue of providing a generalised performance calibration strategy that is applicable to both active and passive detection. The overall goal of the Fellowship is to provide the scientific way forward that will enable SHM systems for damage detection to make the transition from laboratory to industry.