Nonlinear Acoustic Methods
Physical Monitoring Principles
Passive and Active Measurements with Data Analysis Approaches for Load and Damage Identification
Published Online: 15 SEP 2009
Copyright © 2009 John Wiley & Sons, Ltd. All rights reserved.
Encyclopedia of Structural Health Monitoring
How to Cite
Donskoy, D. M. 2009. Nonlinear Acoustic Methods. Encyclopedia of Structural Health Monitoring. .
- Published Online: 15 SEP 2009
The nonlinear acoustic technique (NAT) developed for detecting and characterizing structural and material defects is an emerging field with unique advantages and challenges. NAT exploits nonlinear dynamic behavior produced by contact interfaces and micro- and mesoscopic inhomogeneities associated with structural defects and damages including cracks, disbonds, and delaminations. Nonlinearities across the defects lead to noticeable nonlinear transformations of the interrogating acoustic signals such as harmonic distortions, frequency mixing, modulations, etc. Digital signal processing is used to experimentally capture these transformations unlocking the potential of the NAT to monitor and characterize nonlinear defects and damages in a wide variety of materials and structures.
- nonlinear acoustics;
- contact nonlinearity;
- defect detection;
- damage monitoring;
- acoustic wave interaction;
- harmonic distortion;
- vibroacoustic modulation