Sensor Location Analysis in Nonlinear Acoustics Used for Damage Detection in Composite Chiral Sandwich Panels

Abstract:

This paper demonstrates damage detection in a smart sandwich panel with integrated piezoceramic transducers. The panel is built from a chiral honeycomb and two composite skins. A low-profile, surface-bonded piezoceramic transducer is used for high-frequency ultrasonic excitation. Low-frequency excitation is performed using a piezoceramic stack actuator. Ultrasonic sensing is performed using laser vibrometry. Nonlinear acoustics is applied for damage detection. The study is focused on sensor location analysis with respect to vibro-acoustic wave modulations. The paper demonstrates that when structure is damaged, the high-frequency “weak” ultrasonic wave is modulated by the low-frequency “strong” vibration wave. As a result frequency sidebands can be observed around the main acoustic harmonic in the spectrum of the ultrasonic signal. However, intensity of modulation strongly depends on sensor location.

• Periodical: Advances in Science and Technology (Volume 83)
• Pages: 223-231
• DOI: https://doi.org/10.4028/www.scientific.net/AST.83.223
• Online since: September 2012
• Authors: Andrzej Klepka, Wieslaw Jerzy Staszewski, Dario di Maio, Fabrizio Scarpa, Kong Fah Tee, Tadeusz Uhl
• Keywords: Chiral Structures, Impact Damage Detection, Nonlinear Acoustics, Piezoceramic Transducer, Sensor Location Analysis

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