Topology optimization of periodic microstructures for enhanced loss factor using acoustic–structure interaction. (September 2017)

• Record Type: Journal Article
• Authors: Kook, Junghwan; Jensen, Jakob S.
• Is Part Of: International journal of solids and structures. Volume 122/123(2017)
• Page Start: 59
• Page End: 68
• Publication Date: 2017-09
• Subjects: Topology optimization -- Acoustic–Structure Interaction (ASI) -- Loss factor -- Microstructure; Mechanics, Applied -- Periodicals; Structural analysis (Engineering) -- Periodicals; Elastic solids -- Periodicals; Mécanique appliquée -- Périodiques; Constructions, Théorie des -- Périodiques; Solides élastiques -- Périodiques; Elastic solids; Mechanics, Applied; Structural analysis (Engineering); Periodicals; 624.18
• DOI: 10.1016/j.ijsolstr.2017.06.001
• Languages: English
• ISSNs: 0020-7683

Abstract

Abstract: In this work we present a topology optimization method for the design of 2D composite materials with a distribution of a solid constituent and a lossy acoustic medium for obtaining high loss factors. The method is based on a mixed displacement-pressure finite element (FE) formulation combined with the Bloch-wave condition. We solve the resulting FE eigenvalue problem on a repetitive unit cell with periodic boundary conditions and use a complexk (ω) eigenvalue formulation to compute the loss factor. We consider the optimization problem of maximizing the loss factor in a target frequency range with an additional constraint on the stiffness. In the provided example we demonstrate the effect of combined local resonators and acoustic resonances of similar frequency for creating an enhanced overall loss factor of the material.