权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

RII Track-4: Exploiting Thermoacoustic Assonance to Enrich Multifunctional Meta-Structures

RII Track-4：利用热声共鸣来丰富多功能元结构

基本信息

批准号：
2033399
负责人：
James Manimala
金额：
$ 25.61万
依托单位：
Oklahoma State University
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2021
资助国家：
美国
起止时间：
2021-01-01 至 2023-12-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=2033399&HistoricalAwards=false
关键词：
RII Track Exploiting Thermoacoustic Assonance

项目摘要

Airborne noise mitigation is a significant challenge in several engineering applications, particularly in the aerospace realm where it diminishes efficiency, hampers stealth, contributes to environmental pollution and curtails commercial viability. Conventional technologies have reached practical limits in addressing airborne noise, especially for low-frequency (~1000 Hz) spectra. In partnership with NASA’s Langley Research Center, Thermo-Acoustic Meta-Structures (TAMS), a new class of multifunctional structures will be explored with a focus on mitigating aircraft turbofan engine’s core-noise. A confluence of innovative multi-physical mechanisms within a novel design framework termed ‘assonance’ will be investigated to enrich broadband, low-frequency performance for TAMS. It is expected that new insights will be gained into underlying phenomena enabling the development of modeling tools to create prototype TAMS for evaluation in NASA’s facilities. Successful completion of this project will deliver a new technology for airborne noise mitigation, enhancing critical mission capabilities in several military and commercial engineering applications. This project has substantial congruence with the economic vision and strengths of the regional industrial and educational ecosystem of the State of Oklahoma while also contributing to national aerospace and defense interests and directly enabling technological solutions for sustainable global aviation.The overarching goal of this project is to educe new insights into scaling laws and structure-performance relationships for Thermo-Acoustic Meta-Structures (TAMS) aiding the development of impactful solutions for multifunctional applications, especially in the aerospace realm. Specifically, opportunities to address the aircraft turbofan engine core-noise mitigation priorities of NASA will be explored. Core-noise has significant low-frequency (~1000 Hz) components, as yet unaddressed using conventional acoustic liners. Utilizing available thermal gradients across the engine’s core-wall, a confluence of innovative designs for structural materials and interactive multiphysical mechanisms thereof will be employed to embed thermoacoustic elements into liner meta-structures. A new, computationally-efficient modeling tool based on a mulitphysical model for TAMS embedding the Rott’s model for thermoacoustics in conjunction with vibroacoustic elements within NASA’s Zwikker-Kosten Transmission Line (ZKTL) model for acoustic liners is proposed to be developed. An emergent metamaterials-inspired design framework termed ‘assonance’ will be explored to enrich broadband performance for TAMS. In partnership with NASA, state-of-the-art structural material configurations and fabrication processes will be utilized to construct prototypical test articles for evaluation using NASA’s experimental facilities. Generation of extensive data sets under varying acoustic conditions will help validate the model, extract scaling laws for power-to-volume ratio, influence of radiation impedance and frequency-thermal gradient dependencies and establish new insights into structure-performance relationships for assonant meta-structures. Successful completion of this project will deliver a new technology for airborne noise mitigation, enhancing critical mission capabilities in several military and commercial engineering applications and directly contributing to sustainable global aviation.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.

在一些工程应用中，减少空气中的噪声是一项重大挑战，特别是在航空航天领域，它降低了效率，阻碍了隐身，造成了环境污染，并限制了商业可行性。传统技术在解决空气噪声，特别是低频(~1000赫兹)频谱方面已经达到了实用的极限。与NASA的兰利研究中心合作，热声元结构(TAMS)将探索一类新的多功能结构，重点是降低飞机涡扇发动机的核心噪声。将研究一种名为“协调”的新设计框架内的创新多物理机制的融合，以丰富TAMS的宽带、低频性能。预计将获得对潜在现象的新见解，从而能够开发建模工具来创建原型TAMS，以便在NASA的设施中进行评估。该项目的成功完成将提供一种减少机载噪声的新技术，增强几个军事和商业工程应用中的关键任务能力。该项目与俄克拉荷马州区域工业和教育生态系统的经济愿景和优势有很大的一致性，同时也有助于国家航空航天和国防利益，并直接使可持续全球航空的技术解决方案成为可能。该项目的总体目标是对热声元结构(TAMS)的尺度规律和结构-性能关系产生新的见解，以帮助开发多功能应用的有效解决方案，特别是在航空航天领域。具体地说，将探讨解决美国航天局飞机涡扇发动机核心噪音缓解优先事项的机会。核心噪声具有显著的低频(~1000赫兹)分量，但尚未使用常规声学衬垫解决。利用发动机芯壁上可用的温度梯度，结构材料的创新设计及其相互作用的多物理机制将被用于将热声元件嵌入到线性元结构中。建议开发一种新的、计算高效的建模工具，该工具基于TAMS的多物理模型，将Rott的热声学模型与声学元件一起嵌入NASA的Zwikker-Kosten传输线(ZKTL)声学衬里模型中。将探索一种新的、以超材料为灵感的设计框架，称为“Asonance”，以丰富TAMS的宽带性能。与NASA合作，将利用最先进的结构材料配置和制造工艺来构建原型测试件，以便使用NASA的实验设施进行评估。在不同的声学条件下生成大量的数据集将有助于验证模型，提取功率体积比、辐射阻抗的影响和频率-热梯度依赖关系的标度规律，并建立对协调元结构的结构-性能关系的新见解。该项目的成功完成将提供一种新的空中噪声缓解技术，增强几个军事和商业工程应用中的关键任务能力，并直接为可持续的全球航空做出贡献。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。