Publisher DOI: 10.1016/j.jsv.2022.116885
Title: Physical explanation for vibro-acoustic modulation due to local and global nonlinearities in a structure and its experimental and numerical validation
Language: English
Authors: Dorendorf, Lennart 
Lalkovski, Nikolay 
Rutner, Marcus 
Keywords: Damage detection; Nonlinear acoustics; Structural health monitoring; Vibro-acoustic modulation
Issue Date: 23-Jun-2022
Source: Journal of Sound and Vibration 528: 116885 (2022-06-23)
Abstract (english): 
This article introduces a simple physical explanation that demonstrates why a local or global nonlinearity in a structure causes amplitude modulation and phase modulation in the system response, when employing the vibro-acoustic modulation method for structural health monitoring (SHM) applications. The underlying major assumption and the explanation itself are validated experimentally and numerically. Afterwards, the explanation is used to demonstrate comprehensively why very different types of envelope functions can be observed in the system response, depending on the exciting ultrasonic carrier frequency ω. The beauty of the suggested explanation is that it does not only work for local nonlinearities, such as exhibited by defects, but also for any non-damage induced (local or global) nonlinearity in the system which can cause modulation as well. A physical understanding of cause and effect is of crucial importance here, because the modulation caused by non-damage induced nonlinearities might camouflage the effects of local damage that one is actually interested in during SHM applications.
ISSN: 0022-460X
Journal: Journal of sound and vibration 
Institute: Metall- und Verbundbau B-8 
Document Type: Article
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