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Collaborative Research: Aerodynamic-aeroacoustic performance of poroelastic wings inspired by the silent plumage of owls

合作研究：受猫头鹰沉默羽毛启发的多孔弹性机翼的空气动力-气动声学性能

基本信息

批准号：
1805692
负责人：
Justin Jaworski
金额：
$ 25.2万
依托单位：
Lehigh University
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2018
资助国家：
美国
起止时间：
2018-06-15 至 2022-05-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1805692&HistoricalAwards=false
关键词：
Collaborative Research Aerodynamic aeroacoustic performance

项目摘要

Owls are extraordinary predators that are able to suppress their noise and achieve silent flight while attacking prey/food. The wing fringe pattern of owls is believed to contribute to their quiet flight. An understanding of the physics of the flow over owl wings may lead to noise reductions for many engineering designs, such as computer fans, propulsors, commercial airframes, and wind turbines. The principal aim of this project is to analyze a series of analytical and numerical model problems coordinated with experimental measurement to elucidate the unsteady loading and noise generation of thin fluid-loaded structures with graded poroelastic properties comparable to owl wings. This project addresses the above technical shortcomings through an interactive theoretical-experimental program that distinguishes itself in no fewer than three ways: (i) construction of analytical and numerical frameworks to predict turbulence noise generation by graded poroelastic structures, from first principles; (ii) experimental validation of acoustic scaling laws for poroelastic edges, without background flow noise; and (iii) development of a glider to measure wing noise on the fly in a manner consistent with how owls hear their self-noise. The modeling and validation efforts aim to transform a biologically-inspired noise solution into a rational paradigm for passive aerodynamic noise control in low-speed flows and to create an experimental platform for future bionic owl noise-reduction studies. This project will also include K-12 educational outreach with the DaVinci Science Center (Allentown, PA), as well as integrate undergraduate research involvement through the Lehigh Biosystems Dynamics Summer Institute (in partnership with Northampton Community College) and through a design-build-fly competition between Lehigh and Penn State.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.

猫头鹰是非凡的捕食者，能够抑制它们的噪音，并在攻击猎物/食物时实现无声飞行。猫头鹰翅膀上的条纹图案被认为有助于它们安静地飞行。对猫头鹰翅膀上气流物理特性的理解可能会导致许多工程设计的噪音降低，例如计算机风扇，推进器，商用机身和风力涡轮机。该项目的主要目的是分析一系列的分析和数值模型问题与实验测量相协调，以阐明非定常加载和噪声产生的薄流体加载结构与梯度多孔弹性性能媲美猫头鹰翅膀。该项目通过一个交互式的理论-实验程序解决了上述技术缺陷，该程序至少在三个方面与众不同：（i）从第一原理出发，构建分析和数值框架来预测梯度多孔弹性结构产生的湍流噪声;（ii）在没有背景流噪声的情况下，对多孔弹性边缘的声学标度律进行实验验证;以及（iii）研制一种滑翔机，以与猫头鹰听到自身噪音的方式一致的方式测量飞行中的机翼噪音。建模和验证工作旨在将生物启发的噪声解决方案转化为低速气流中被动气动噪声控制的合理范例，并为未来的仿生猫头鹰降噪研究创建实验平台。该项目还将包括与达芬奇科学中心的K-12教育推广活动（Allentown，PA），以及通过利哈伊生物系统动力学暑期研究所整合本科生研究参与（与北安普顿社区学院合作），并通过设计-建造-该奖项反映了NSF的法定使命，并被认为值得通过使用基金会的学术价值和更广泛的影响审查标准。