Open Access

ARTICLE

The Frequency Selection of SH0 Waves for Total Transmission and Its Application in the Damage Detection of Aircrafts

by Yanchao Yue, Tangbing Chen, Lingling Zhang, Moustafa Abdelsalam, Josephine Musanyufu

1 Department of Civil Engineering, Xi’an Jiaotong University, Xi’an, 710049, China.

* Corresponding Author: Yanchao Yue. Email: .

(This article belongs to the Special Issue: Nonlinear Computational and Control Methods in Aerospace Engineering)

Computer Modeling in Engineering & Sciences 2020, 122(1), 259-272. https://doi.org/10.32604/cmes.2020.07218

Received 09 May 2019; Accepted 11 June 2019; Issue published 01 January 2020

Abstract

Based on wave interference, a methodology to realize the total transmission phenomenon of SH0 waves is proposed in this paper. After a systematical theoretical investigation, an exact frequency of a flat plate consisting of another medium with finite length, is obtained, which is furthermore exemplified by the finite element method. This frequency is the same as the classical Fabry-Perot condition and dependent on the thickness of the material. It has been revealed that an SH0 wave, with its wavelength equal to twice of the length of another medium, can totally transmit across the medium without reflection. Especially when the impedance changes in a specific range, the energy of transmitted waves can keep in a high level, which is frequency-independent. Not limited by a flat plate, the Fabry-Perot condition is also suitable for a scraggy plate when the thickness variation is relatively small. Finally, using the transfer matrix method, the wave propagation in a plate with multiple layers is quantitatively investigated, and the frequency analysis for total transmission is carried out. The methodology, as well as the design scheme proposed, is achievable and artificially controllable, which opens a new prospect for the wave control and final applications in aeronautics and astronautics.

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Keywords

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