|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
|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.
|URI:||http://hdl.handle.net/11420/12118||ISSN:||0022-460X||Journal:||Journal of sound and vibration||Institute:||Metall- und Verbundbau B-8||Document Type:||Article|
|Appears in Collections:||Publications without fulltext|
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