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Project Title: A method of compensation of environmental and operational conditions for guided wave-based structural health monitoring

Pouria Aryan, Andrei Kotousov, Ching-Tai Ng and Benjamin Cazzolato

In recent years significant progress in in-situ damage detection was achieved with development of SHM based on guided waves. Compensation of changing environmental and operational conditions (EOC) is often necessary when using guided-wave based techniques for structural health monitoring in real-world applications. Many studies have demonstrated that that the effect of changing EOC is capable to mask damage to a degree that a critical defect might not be detected. Several effective strategies, specifically for compensating the temperature variations, have been developed in recent years.

However, many other factors, such as humidity, degradation of material properties and altering boundary conditions, have not received much attention, and compensation or differentiation strategies for these factors are yet to be developed. This research describes a practical method for reconstruction of the baseline time-trace for a free from defect structure corresponding to the current EOC of the structural component. The method is based on 3D surface measurements of the transient displacement/velocity fields near the actuator using advanced 3D laser vibrometry in conjunction with high-fidelity FE simulations.

Acoustics Vibration and Control Research Group
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THE UNIVERSITY OF ADELAIDE
SA 5005 AUSTRALIA

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