Abstract：
:This paper presents a study on topology optimization of novel material microstructural configurations to achieve directional elastic wave propagation through maximization of partial band gaps. A waveguide incorporating a periodic-microstructure material may exhibit different propagation properties for the plane elastic waves incident from different inlets. A topology optimization problem is formulated to enhance such a property with a gradient-based mathematical programming algorithm. For alleviating the issue of local optimum traps, the random morphology description functions (RMDFs) are introduced to generate random initial designs for the optimization process. The optimized designs finally converge to the orderly material distribution and numerical validation shows improved directional propagation property as expected. The utilization of linear two-dimension phononic crystal with efficient partial band gap is suitable for directional propagation with a broad frequency range.
journal_name
Ultrasonicsjournal_title
Ultrasonicsauthors
He J,Kang Zdoi
10.1016/j.ultras.2017.07.006subject
Has Abstractpub_date
2018-01-01 00:00:00pages
1-10eissn
0041-624Xissn
1874-9968pii
S0041-624X(17)30004-5journal_volume
82pub_type
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