Abstract
Structural Health Monitoring (SHM) has been proposed by many re- searchers as a way to reduce maintenance cost and increase availability of aircraft fleets. But long term exposure to the aircraft environment can have a degrading ef- fect on the performance of a given SHM system. Predictable performance of SHM systems after extended exposure to aircraft environmental factors is key to the ef- fective implementation of SHM on aircraft fleets. This study shows how existing NDE reliability techniques can be extended to model changes in SHM system per- formance due to extended exposure to the aircraft environment. Degradation coef- ficients are added to the traditional probability of detection, POD(a), formulations described in MIL-HDBK-1823. A POD(a; n) surface is then derived to account for the effects of an environmental factor on SHM system performance. Example degradation coefficient values are derived using experimental results.
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