Evaluation of Vibration and Acoustic Properties of Lattice Structure Manufactured by Selective Laser Melting

Abstract

In this paper, vibration and sound absorption properties of poroelastic lattice structure are investigated through numerical simulation and measurement experiment. The lattice structures discussed in this paper are composed of slender beams only (BCC) and beams and shells (BCC-S), and can be fabricated by using the selective laser metal melting machine. In our numerical investigation, the homogenization method is used to calculate a macroscopic elastic tensor for a solid phase, an equivalent density and a bulk modulus for a fluid phase. Also, the finite element calculation is used to obtain the natural vibration frequency of the lattice structure. The obtained numerical result of the sound absorption coefficient agrees fairly with the experimental result.