Vibro-acoustic analysis of auxetic hexagonal and anti-tetrachiral stepped cantilever beams


Farhangdoust S., Adediran I. A. , RANJBAR M. , Krushynska A. O.

Health Monitoring of Structural and Biological Systems XV 2021, Virtual, Online, United States Of America, 22 - 26 March 2021, vol.11593 identifier

  • Publication Type: Conference Paper / Full Text
  • Volume: 11593
  • Doi Number: 10.1117/12.2583341
  • City: Virtual, Online
  • Country: United States Of America

Abstract

© 2021 SPIEThis research develops lightweight stepped cantilever beams using two auxetic hexagonal and anti-tetrachiral designs to reduce sound radiation from vibrating modes of attached structures. A finite element analysis (FEA) is employed to investigate the equivalent radiated power level (ERPL) of the proposed beams subjected to different excitations. A computational parametric study is performed to minimize the ERPL for two in-plane and out-of-plane configurations of the beams over a frequency range of 0 Hz to 1200 Hz. The vibro-acoustic responses of the beams are validated by two acoustic techniques of the radiated sound pressure level (RSPL) and far-field sound pressure level (FFSPL). Numerical results demonstrate an excellent vibro-acoustic performance in reducing the radiated sound power level for the beams. The proposed beams can be utilized for high-tech devices where the radiated noise control is desired. This paper opens up a great potential of using auxetic stepped cantilever beams for various engineering applications in Acoustics, Civil, Aerospace, Biomedical, and Mechanical Engineering.