Dynamic Analysis of a Beam with Double-Spiral Locally Resonant Systems

Abstract

This thesis presents a novel metamaterial beam with periodic substructures Each cell consisted of two parts: a host beam with central hole and a substructure embedded in it The substructure is comprised of a double-spiral beam with a central mass With the finite element software COMSOL Multiphysics the dynamic behavior of the metamaterial beam is investigated The simulated results demonstrated that the band gap and negative mass exist in such a structure Moreover two theoretical models were proposed to calculate the natural frequency of the substructure Both calculations approximately matched with simulation results The error is less than 5% The natural frequency of the substructure was close to the starting frequency of the band gap By adjusting dimensions of the substructure control of the vibration attenuation zone in the structure can be achieved

Date of Award	2020
Original language	English
Supervisor	Jung-San Chen (Supervisor)