Amplitude-Modulation Vibro-Acoustic Technique for Damage Evaluation

Abstract

This study proposes an amplitude-modulation vibro-acoustic (AMVA) technique to track the evolution of thermal damage in pristine graphene mortar. In the proposed amplitude-modulation technique, the pump wave is amplitude-modulated using three different methods: (1) the pure amplitude-modulated (PAM) method, (2) the suppressive amplitude-modulated (SAM) method and (3) the transmitted amplitude-modulated (TAM) method. The nonlinear parameters [Formula: see text], [Formula: see text] and [Formula: see text] corresponding to the PAM, SAM and TAM methods, respectively, are theoretically established and experimentally demonstrated that the nonlinear parameters associated with the material nonlinearity, and they can be used to quantitatively characterize different damage stages of thermal damage. Meanwhile, the resonant frequency (RF) and ultrasonic pulse velocity (UPV) tests are conducted. The linear measurements, dynamic elastic modulus [Formula: see text] obtained from RF test and ultrasonic pulse velocity [Formula: see text] collected by UPV test, are used to compare with the nonlinear parameters. The results show that the proposed AMVA technique is more sensitive and feasible to serve as the tool for thermal damage detection in cement-based material compared with the conventional RF and UPV techniques.

Higher-order effects of amplitude-modulation vibro-acoustic technique for characterization thermal damages in cement-based material

“…Dziedziech K et al used swept waves for pump wave and probe wave [10]. Apart from the swept wave, Yin T et al proposed three amplitude-modulated vibro-acoustic methods where LF pump wave was pre-amplitude-modulated to achieve lower energy consumption and versatility [11,12]. However, in the previous study, the effect of higher-order sidebands sometimes was not considered, but it is sensitive to defects and cracks, resulting in increasing amplitude and numbers of sidebands.…”

A novel time domain-based multiple breathing crack diagnosis technique using Quadratic-Teager Kaiser Energy (Q-TKE)

“…While the dynamic behavior of beams with a single breathing crack has received much attention, [3][4][5][6][7][8][9][10][11][12] very limited investigations have been reported on multiple breathing cracks. [13][14][15][16][17][18][19] As the number of breathing cracks present in the beams and their spatial locations is usually not known a priori, detection and localization of multiple breathing cracks are much more challenging.…”