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

被引：9

作者：

Klepka, A. ^{[1
]}

Staszewski, W. J. ^{[1
]}

Dziedziech, K. ^{[1
]}

Aymerich, F. ^{[2
]}

机构：

[1] AGH Univ Sci & Technol, Dept Robot & Mechatron, Al Mickiewicza 30, PL-30059 Krakow, Poland

[2] Univ Cagliari, Dept Mech Engn, I-09123 Cagliari, Italy

来源：

DAMAGE ASSESSMENT OF STRUCTURES X, PTS 1 AND 2 | 2013年 / 569-570卷

关键词：

non-linear acoustics; vibro-acoustic modulations intensity of modulation; damage detection; composites; ACOUSTIC HARMONIC-GENERATION; IMPACT DAMAGE DETECTION; CRACK DETECTION;

D O I：

10.4028/www.scientific.net/KEM.569-570.924

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

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.

引用

页码：924 / +

页数：3

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