Adaptive acoustic energy delivery to near and far fields using foldable, tessellated star transducers
Adaptive acoustic energy delivery to near and far fields using foldable, tessellated star transducers
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使用可折叠、镶嵌的星形换能器将自适应声能传输到近场和远场
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
R. Harne
中科院分区：
文献类型：
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作者：
Chengzhe Zou;R. Harne
长期以来，在太空中任意引导声能的方法一直依赖于数字控制来满足性能需求。然而，最近对具有独特空间构型的自适应结构的关注促进了机械信号处理(MSP)概念的发展，这些概念可能不会受到与数字声学波束形成同行相同的功能和性能限制。由折纸启发的镶嵌架构实现的可重复结构重新配置的周期性将注意力转向可折叠平台作为MSP开发的框架。这项研究利用MSP的原理来研究一种镶嵌的星形声学换能器组件，该组件通过折叠诱导的形状重新配置来提供声能引导的按需控制。建立了力学几何和声学几何对声能远场指向性和近场聚焦影响的分析框架。在实验验证和模拟验证之后，进行了参数研究，以揭示自由场中任意点的组成拓扑和声能传递之间的关系。通过折叠星形换能器实现的自适应显示了将声能限制到远场中的角度区域的能力，同时还引入了将声能调制三个数量级到换能器表面附近位置的方法。此外，本文设计的建模思想为解决任意几何形状的可折叠、镶嵌的声换能器组件的一般声辐射问题提供了一种有价值的方法。
Methods of guiding acoustic energy arbitrarily through space have long relied on digital controls to meet performance needs. Yet, more recent attention to adaptive structures with unique spatial configurations has motivated mechanical signal processing (MSP) concepts that may not be subjected to the same functional and performance limitations as digital acoustic beamforming counterparts. The periodicity of repeatable structural reconfiguration enabled by origami-inspired tessellated architectures turns attention to foldable platforms as frameworks for MSP development. This research harnesses principles of MSP to study a tessellated, star-shaped acoustic transducer constituent that provides on-demand control of acoustic energy guiding via folding-induced shape reconfiguration. An analytical framework is established to probe the roles of mechanical and acoustic geometry on the far field directivity and near field focusing of sound energy. Following validation by experiments and verification by simulations, parametric studies are undertaken to uncover relations between constituent topology and acoustic energy delivery to arbitrary points in the free field. The adaptations enabled by folding of the star-shaped transducer reveal capability for restricting sound energy to angular regions in the far field while also introducing means to modulate sound energy by three orders-of-magnitude to locations near to the transducer surface. In addition, the modeling philosophy devised here provides a valuable approach to solve general sound radiation problems for foldable, tessellated acoustic transducer constituents of arbitrary geometry.