Multiple broadband gaps and vibration suppression mechanisms for innovative star shaped metamaterial structures with triangular characteristics

Abstract

Metamaterials have received extensive attention due to their special properties in the fields of wave attenuation and acoustic engineering. Many researchers have designed metamaterials with different band gap frequency ranges. In this paper, a star shaped metamaterial structure with triangular characteristics is proposed to attenuate mid and low frequency elastic waves in practical applications. The band gap and dispersion characteristics of the structure are numerically studied. The results show that the structure generates ultra-wide band gaps in the frequency range of 6000 Hz, accounting for up to 69.14%. Interestingly, by adding a support structure to the original structural unit, the bandwidth of the improved structure reached 73.89%, and multiple band gaps were opened within 2000 Hz. Finally, the vibration transmission loss of the structure is analyzed by finite element method, and the control performance of vibration transmission in periodic structures is simulated, demonstrating its potential in practical applications.

Keywords:

• Wave propagation
• metamaterials
• vibration attenuation
• group velocity
• band gap

Disclosure statement

The authors declare that they do not have any financial and personal relationships with other people or organizations that represent a conflict of interest in connection with the manuscript submitted.

Data availability statement

No additional data are available.

Additional information

Funding

The project was supported by the National Natural Science Foundation of China (Grant No. 12072222, 12132010, 12021002, 11991032), the State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures (Grant No. SKLTESKF1901), and the Aeronautical Science Foundation of China (Grant No. ASFC-201915048001).