STRUCTURAL HEALTH MONITORING USING TIME-DELAY EMBEDDING AND PHASE-SPACE WARPING

Abstract eng:
This paper presents a method to utilize Time-Delay Embedding (TDE) to perform structural health monitoring and obtain a damage metric that tracks deterioration in structural health over time. Proof-of-concept is demonstrated through an experimental investigation. The experimental setup consisted of high-rise building model, made of aluminium, mounted on a digitally-controlled shaker table. Floor accelerations are recorded using accelerometers on each elevation to capture the dynamic response during the base excitation. Natural modes of vibration and their corresponding frequencies were determined experimentally using a frequency sweep of low-amplitude sinusoidal support excitations. The model building was excited at its natural frequency with moderate-amplitude sinusoidal base excitation to establish its “pristine” condition baseline. Subsequently, damage is introduced to columns on the first floor by cutting two notches at mid-height, significantly reducing their crosssectional areas. The same base motion protocol was re-applied and acceleration data was collected and processed to detect the pre-known damage patterns as well as the total failure using changes in the oscillation orbits. The damage metric is shown to adequately detect structural damage.

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