Application of the Triple Correlation Technique to Damage Detection of Structures

Abstract

This paper reports the Triple Correlation Coefficient technique for impact damage detection in composite structures. Low-frequency modal vibration is used to excite a composite plate. A surface-bonded piezoceramic stack actuator is applied for excitation. Non-contact laser vibrometry is used for response measurements. The method correlates the fundamental frequency of signal response with higher harmonics appearing in the signal as a result of damage.