Abstract
This study described the investigation results on change in vibration characteristics of structures due to damage based on ambient vibration and forced vibration testing using a micro shaking device. We firstly estimated changes in natural frequencies, damping ratios and mode shapes between intact and damaged structures from ambient vibration measurements. Secondly, we obtained changes in harmonic excitation responses and investigated their sensitivitires to damage. Compared to natural frequencies, damping ratios and mode shapes, harmonic excitation responses have larger sensitivities to damage and have the higher possibility to be used as input data for damage detection.
