Baseline-free damage identification in clamped-clamped pipes based on regional resonance pairs

The significant challenge in many structural health monitoring (SHM) approaches is the reliance on baseline data. The critical importance of early damage detection is acknowledged to prevent catastrophic failures. In this work, a novel baseline-free vibrational method for assessing corrosion damage in pipes is introduced. The concept of regional resonance pairs (RRP) is presented for the detection, classification, localization, and quantification of damage without the need for baseline modal characteristics. The method effectiveness is demonstrated through experimental validation with clamped-clamped boundary conditions across various damage scenarios. Corrosion impacts are successfully identified using the RRP approach, with frequency deviations of active components maintained within ±5 %. Its sensitivity is sufficient to detect damage corresponding to a cross-sectional area loss of at least 4 %. The potential of RRP is a robust, noise-resistant tool for baseline-free damage detection in pipe systems. This method offers significant advantages in operational environments where baseline data may be unavailable or unreliable.