Journal
MATERIALS
Volume 15, Issue 8, Pages -Publisher
MDPI
DOI: 10.3390/ma15082722
Keywords
time-variant systems; wavelet-based transmissibility and coherence; output-only analysis
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Funding
- AGH, Robotics and Mechatronics Department
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This paper proposes a method using time-variant transmissibility to detect structural damage. By applying time-frequency transmissibility and relevant coherence function, abrupt damage-related changes to structural dynamics can be monitored.
Short-time, abrupt events-such as earthquakes and other shock loadings-often lead to damage that is difficult to detect in structures using output-only vibration measurements. The time-variant transmissibility is proposed to tackle this problem. The approach is based on two-dimensional wavelet power spectra. The time-frequency transmissibility and relevant coherence function are used for structural damage detection in structural elements in buildings. Numerical simulations and experimental tests are used in these investigations. The results are compared with the classical transmissibility and time-variant input-output wavelet approach. The paper shows that output-only measurements and wavelet-based transmissibility can be used to monitor abrupt damage-related changes to structural dynamics.
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