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论文类型：期刊论文

发表时间：2018-01-01

发表刊物：ULTRASONICS

收录刊物：SCIE、EI、PubMed

卷号：82

页面范围：1-10

ISSN号：0041-624X

关键字：Phononic crystal; Band gap; Waveguide; Directional propagation; Topology optimization

摘要：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. (C) 2017 Elsevier B.V. All rights reserved.