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HomeKey Engineering MaterialsKey Engineering Materials Vols. 569-570Non-Linear Vibro-Acoustic Wave Modulations -...

Non-Linear Vibro-Acoustic Wave Modulations - Analysis of Different Types of Low-Frequency Excitation

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Abstract:

Signal processing method based on wavelet transform used in non-linear acoustic test is presented in the paper. The method is applied for sidebands identification in response signal acquired during vibro-acoustic modulation test of impacted carbon fiber reinforced plate (CFRP). The plate was impacted with known energy using drop-weight testing machine. The modulation effect in investigated specimen results from the interaction of low and high frequency excitation with damage. The paper investigates different than mono-harmonic low-frequency excitation usually used in non-linear acoustics tests. Application of aperiodic low-frequency excitation signal allows to omit the modal test, where natural frequency of the structure are estimated. However, this requires the use of dedicated signal processing methods.

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Periodical:

Key Engineering Materials (Volumes 569-570)

Pages:

924-931

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.569-570.924

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Online since:

July 2013

Authors:

Andrzej Klepka, Wieslaw Jerzy Staszewski, Kajetan Dziedziech, Francesco Aymerich

Keywords:

Composite, Damage Detection, Intensity of Modulation, Non-Linear Acoustics, Vibro-Acoustic Modulations

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