Minimization of sound radiation from vibrating bi-material structures using topology optimization

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A survey of structural and multidisciplinary continuum topology optimization: post 2000 (2014, background): “Du and Olhoff (2007b) extended this idea with a formulation that places a heavy penalty, when compared to the penalization of stiffness, on the mass of elements with density below 0.1.”
Topological design of freely vibrating continuum structures for maximum values of simple and multiple eigenfrequencies and frequency gaps (2007, background): “We show in two sequential papers that the same desirable effects can be achieved by topological design for minimum dynamic compliance (Olhoff and Du 2007 )a nd for minimum sound radiation ( Du and Olhoff 2007 ), respectively, of continuum structures subjected to given excitation frequencies of force”
A critical review of established methods of structural topology optimization (2009, background): “Olhoff has also been extremely active in applying SIMP to reliability-based problems (Kharmanda and Olhoff 2004), vibrating continua (Olhoff and Du 2006; Du and Olhoff 2007a and b), and design-dependent loads (Hammer and Olhoff 1999, 2000; Du and Olhoff 2004a and b). Maute extended topology optimi”