Chapter 14
Study on the Propagation Law of Lamb
Wave in High Stiffened Panels
Yantao Liu, Guoliang Xu, Gang Sun, and Zhe Wang
Abstract The study of Lamb wave propagation law is of great significance for
health monitoring and non-destructive testing of panel structures. However, in the
panel with stiffeners, the propagation law of the Lamb wave is very complicated, and
there are still some inadequacies in the current research, especially for the stiffened
panel with multiple high stiffeners. In this paper, the propagation law of Lamb waves
in panels with multiple high stiffeners is studied by finite element simulation. The
time domain waveforms of received displacements are compared when the number of
stiffeners is different, and the energy ratio curves are obtained. The results show that
the number of stiffeners has little effect on the wave velocity of the Lamb wave. The
Lamb wave decays when it passes through the stiffeners, and the more the number of
stiffeners, the more obvious. In the 200–500 kHz band, the Lamb wave energy ratio
curve is moderate and small, and the Lamb wave energy pass rate is high and stable
in the 100–200 kHz band. This study can provide reference for signal analysis in the
structural health monitoring and non-destructive testing of high stiffened panels.
14.1 Introduction
In the panel structure, the acoustic wave propagates mainly in the form of Lamb
waves, and the study of the Lamb wave propagation law is of great significance for the
monitoring of the health state of the structure [1, 2]. For example, the source is located
by analyzing acoustic emission signals of impact and leakage [3–6]. However, some
metal and composite panels are usually provided with periodic stiffeners structure on
the surface in order to ensure sufficient mechanical strength. When the Lamb wave
passes through the stiffeners, transmission, reflection, scattering, attenuation and
modal transformation occur. And the higher the stiffeners, the larger the number of
stiffeners, the more complex the Lamb wave, and the interference of these phenomena
makes signal analysis more difficult. In recent years, some scholars have studied these
effects.
Y. Liu (B) · G. Xu · G. Sun · Z. Wang
Beijing Institute of Structure and Environment Engineering, Beijing 100076, China
e-mail: lytus@126.com
© The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2021
G. Shen et al. (eds.), Advances in Acoustic Emission Technology, Springer Proceedings
in Physics 259, https://doi.org/10.1007/978-981-15-9837-1_14
149
Study on the Propagation Law of Lamb
Wave in High Stiffened Panels
Yantao Liu, Guoliang Xu, Gang Sun, and Zhe Wang
Abstract The study of Lamb wave propagation law is of great significance for
health monitoring and non-destructive testing of panel structures. However, in the
panel with stiffeners, the propagation law of the Lamb wave is very complicated, and
there are still some inadequacies in the current research, especially for the stiffened
panel with multiple high stiffeners. In this paper, the propagation law of Lamb waves
in panels with multiple high stiffeners is studied by finite element simulation. The
time domain waveforms of received displacements are compared when the number of
stiffeners is different, and the energy ratio curves are obtained. The results show that
the number of stiffeners has little effect on the wave velocity of the Lamb wave. The
Lamb wave decays when it passes through the stiffeners, and the more the number of
stiffeners, the more obvious. In the 200–500 kHz band, the Lamb wave energy ratio
curve is moderate and small, and the Lamb wave energy pass rate is high and stable
in the 100–200 kHz band. This study can provide reference for signal analysis in the
structural health monitoring and non-destructive testing of high stiffened panels.
14.1 Introduction
In the panel structure, the acoustic wave propagates mainly in the form of Lamb
waves, and the study of the Lamb wave propagation law is of great significance for the
monitoring of the health state of the structure [1, 2]. For example, the source is located
by analyzing acoustic emission signals of impact and leakage [3–6]. However, some
metal and composite panels are usually provided with periodic stiffeners structure on
the surface in order to ensure sufficient mechanical strength. When the Lamb wave
passes through the stiffeners, transmission, reflection, scattering, attenuation and
modal transformation occur. And the higher the stiffeners, the larger the number of
stiffeners, the more complex the Lamb wave, and the interference of these phenomena
makes signal analysis more difficult. In recent years, some scholars have studied these
effects.
Y. Liu (B) · G. Xu · G. Sun · Z. Wang
Beijing Institute of Structure and Environment Engineering, Beijing 100076, China
e-mail: lytus@126.com
© The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2021
G. Shen et al. (eds.), Advances in Acoustic Emission Technology, Springer Proceedings
in Physics 259, https://doi.org/10.1007/978-981-15-9837-1_14
149