Structural Health Monitoring through Vibration-Based Approaches

[...]dynamic monitoring systems have proven to be particularly suited for systems whose structural behaviours are strongly influenced by their geometric complexity or the inhomogeneity of their constituent materials. [...]the monitoring of a set of appropriately chosen features jointly with the identification of the local and global structural weaknesses may reveal the effectiveness of safety and retrofitting interventions, as well as any progression of structural damage. [...]the alpha-stable distribution (ASD) and multifractal detrended fluctuation analysis (MFDFA) of the envelope signal are performed, and five characteristic parameters with significant stability and sensitivity are extracted and then brought into the least-squares support vectors machine based on particle swarm optimization to determine the state of the bearing quantitatively. [...]an improved LMD method is developed to decompose vibration signals into a subset of amplitude modulation/frequency modulation (AM-FM) product functions (PFs).