CAREER: Adaptive Origami Structures for Acoustic Wave Guiding

引导声波的能力是从癌症治疗到水下生态系统监测等广泛应用的核心。声波导引技术被广泛应用于医疗和工程应用，如超声、公共广播系统中的声音投影、水下生态系统监测和几个国防应用。最先进的方法使用固定位置的声学换能器和数字控制信号来管理它们的导波能力。这些方法往往是不准确的，因为它们在定位虚拟源或接收器时存在固有的模糊性。这限制了他们进行有效的波导的能力。这一学院早期职业发展计划(CALEAR)项目将通过创新地使用折纸科学来显著增强最先进的波浪引导能力。这项研究将研究受折纸启发的可重新配置和自适应的声学换能器，这种换能器可以实现简单但高效的波导。这些以折纸为灵感的换能器阵列的便携性将推动医疗保健、生态系统监测和国防方面的新应用。本项目将为声波导引知识库的建设做出新的贡献。该项目还吸引了从小学到研究生的各级学生的大量参与。通过在一个综合的研究-教育项目中利用折叠折纸结构的技术主题，这个职业项目将通过一个多方面的倡议来纠正学生对声学日益减弱的暴露和兴趣，该倡议将为多个层次的学生群体介绍、沉浸和灌输声学原理。这个职业项目将建立分析和计算工具，以了解受折纸启发的自适应声学结构如何改变波导实践。建模框架将通过无量纲的空间傅立叶变换将声学、几何学和力学联系起来，以阐明线性/非线性波导现象，并与数字控制方法和理想的声辐射器/接收器形成鲜明的对比。实验验证的框架将揭示无尺度波导原理中镶嵌几何形状、折叠程度和波长之间的相关性，而虚拟换能器定位和物理换能器定位之间的对比将揭示数字波场控制方法中不足的根源，并将注意力引导到折纸启发的和数字控制的波导的最佳组合上。框架的逆转将使设计的镶嵌阵列能够获得所需的声波导引特性，并将广泛推进折叠结构的多物理优化。该奖项反映了NSF的法定使命，并通过使用基金会的智力优势和更广泛的影响审查标准进行评估，被认为值得支持。

Ability to guide acoustic waves is central to a wide range of applications from cancer treatment to underwater ecosystem monitoring. Acoustic wave guiding techniques are widely used in medical and engineering applications such as ultrasound, sound projection used in public announcement systems, underwater ecosystem monitoring, and several defense applications. The state-of-the-art methods use fixed locations of acoustic transducers and digitally controlled signals to manage their wave guiding ability. These methods often tend to be inaccurate as they suffer from inherent ambiguity in locating virtual source or receiver. This limits their ability to do effective wave guiding. This Faculty Early Career Development Program (CAREER) project will significantly enhance the state-of-the-art in wave guiding capability by innovative use of origami science. The research will investigate reconfigurable and adaptive origami-inspired acoustic transducers that can achieve simple yet highly effective wave guiding. The portability of these origami-inspired transducer arrays will propel new applications in health care, ecosystem monitoring, and defense. This project will make new contributions to the knowledge base in acoustic wave guiding. The project also has significant involvement of students at all levels from elementary to graduate. By harnessing the technical themes of folding origami structures in an integrated research-education program, this CAREER project will redress waning student exposures and interest in acoustics by a multi-faceted initiative that will introduce, immerse, and instill acoustic principles for student groups at many levels.This CAREER project will establish analytical and computational tools to yield understanding on how origami-inspired, adaptive acoustic structures may transform wave guiding practices. The modeling framework will bridge acoustics, geometry, and mechanics via non-dimensional, spatial Fourier transforms to illuminate linear/nonlinear wave guiding phenomena and enable clear contrast with digital control methods and ideal acoustic radiators/receivers. The experimentally validated framework will reveal correlations among tessellation geometry, folding extent, and wavelength for scale-free wave guiding principles, while contrast between virtual and physical transducer positioning will expose origins of deficiencies in digital wave field control methods and guide attention to prime combinations of origami-inspired and digitally controlled wave guiding. A reversal of the framework will enable the design tessellated arrays for desired acoustic wave guiding properties, and will broadly advance multiphysics optimization of folding structures.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.