Wave propagation in metamaterial lattice sandwich plates

Xin Fang; Jihong Wen; Jianfei Yin; Dianlong Yu

doi:10.1117/12.2219018

1 April 2016 Wave propagation in metamaterial lattice sandwich plates

Xin Fang, Jihong Wen, Jianfei Yin, Dianlong Yu

Proceedings Volume 9805, Health Monitoring of Structural and Biological Systems 2016; 98052R (2016) https://doi.org/10.1117/12.2219018
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2016, Las Vegas, Nevada, United States

Abstract

This paper designed a special acoustic metamaterial 3D Kagome lattice sandwich plate. Dispersion properties and vibration responses of both traditional plate and metamaterial plate are investigated based on FEA methods. The traditional plate does not have low-frequency complete bandgaps, but the metamaterial plate has low-frequency complete bandgap (at 620Hz) coming from the symmetrical local cantilever resonators. The bandgap frequency is approximate to the first-order natural frequency of the oscillator. Complex wave modes are analyzed. The dispersion curves of longitudinal waves exist in the flexural bandgap. The dispersion properties demonstrate the metamaterial design is advantageous to suppress the low-frequency flexural wave propagation in lattice sandwich plate. The flexural vibrations near the bandgap are also suppressed efficiently. The longitudinal excitation stimulates mainly longitudinal waves and lots of low-frequency flexural vibration modes are avoided. Furthermore, the free edge effects in metamaterial plate provide new method for damping optimizations. The influences of damping on vibrations of the metamaterial sandwich plate are studied. Damping has global influence on the wave propagation; stronger damping will induce more vibration attenuation. The results enlighten us damping and metamaterial design approaches can be unite in the sandwich plates to suppress the wave propagations.

Citation Download Citation

Xin Fang, Jihong Wen, Jianfei Yin, and Dianlong Yu "Wave propagation in metamaterial lattice sandwich plates", Proc. SPIE 9805, Health Monitoring of Structural and Biological Systems 2016, 98052R (1 April 2016); https://doi.org/10.1117/12.2219018

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