Recent trends show an increasing need for prognostics and lifetime estimations for damage critical structures in various industries. Military aviation is a major application area for Structural Health Monitoring (SHM) systems. Out of numerous SHM approaches being under investigation, sensor-based Acousto Ultrasonics (AU) systems which use guided waves for damage detection have great potential of meeting the future needs of autonomous life prognostics. Besides the technical development and integration of such systems, ways for the aeronautical certification are explored. The reliability of SHM systems is a key issue for certification. Common understanding for assessing the performance and reliability in terms of damage detection is needed. Therefore the Probability of Detection (POD) is a major indicator. Existing approaches used in the field of Non Destructive Testing (NDT) based on testing are not fully applicable to POD assessments due to restricted test efforts. Simulation based assessments will help to minimise the test effort to an acceptable scope. Simulation techniques need basic knowledge of wave propagation physics, material properties of monitored structures and influencing parameters. Detailed validation of the simulation techniques tools is necessary to satisfy the certification issues. This paper presents reliability aspects in the context of sensor-based AU systems. Several influencing parameters on system reliability are investigated. Effects of sensor integration, environmental conditions and guided wave modes on detection reliability are considered.
Influences on reliability and performance of AU based SHM systems, requirements and approach for detection performance assessment
2013
8 Seiten, 6 Bilder, 1 Tabelle, 12 Quellen
Conference paper
Storage medium
English
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