Abstract
This paper describes a cumulative harmonic analysis (CHA) that replaces the stepwise time window function of Berman and Fincham's cumulative spectral analysis with a spectral accumulation function, thereby enabling a new structural health monitoring method. CHA estimates and visualizes system damping conditions without the need of transient-vibration records. The damping conditions are closely related to the spectral distribution around the dominant spectral peaks due to structural resonance. This type of spectral distribution can be visualized with CHA even within a short interval of random vibration samples. The effect of CHA on monitoring the damping conditions was reported by the authors in a previous study. In the current study, the authors confirmed the usefulness of CHA for structural condition monitoring by conducting scale-model experiments.
Highlights
This study aims at visualizing the spectral changes in random structural vibrations due to external noise
Numerical simulations and experiments using a scale model confirmed that cumulative harmonic analysis (CHA) well-visualizes temporal changes in a damped vibrating system and modal overlap conditions from random vibration records corresponding to an unknown external noise source
This development opens up a potential new area in cumulative analysis by introducing a spectral accumulation function into the method of Berman and Fincham
Summary
This study aims at visualizing the spectral changes in random structural vibrations due to external noise. Spectral changes in a vibration might be informative for monitoring the health of a system and for structural diagnostics. If the changes in harmonic characteristics could be analyzed from the subtleties of structural vibrations caused by external noise, the health of the structure would be able to be monitored at any time. It is difficult to track random variations by using the structural transfer functions independent of the source signal characteristics. This is because the transfer function analysis of structural vibration systems generally requires the external source characteristics to be specified [2, 3]
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