EAGER: Acoustic Diode as Architectural Material (ADAM)

EAGER：声学二极管作为建筑材料 (ADAM)

• 批准号: 1745232
• 负责人: Piervincenzo Rizzo
• 金额: $ 20万
• 依托单位: University of Pittsburgh
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2017
• 资助国家: 美国
• 起止时间: 2017-08-01 至 2019-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1745232&HistoricalAwards=false
• 关键词: EAGER; Acoustic; Diode; Architectural; Material

Acoustic noise is the slyest form of pollution because its effects on the human health are underestimated. Exposure to noise may hamper the nervous system, trigger stress and sleep disorder, and may cause heart problems and high blood pressure. People are exposed to noise almost anywhere. For this reason engineers and architects strive to create effective and fine solutions to mitigate indoor-generated noise in order to enhance the comfort of the occupants, improve personnel efficiency in the workplace, guarantee privacy, and to provide distraction-free spaces. With this societal problem in mind, this EArly-concept Grant for Exploratory Research (EAGER) project will explore a new architectural system, based on the concept of acoustic diode acting as a sound barrier. The outcome of this EAGER will enable to carry out a comprehensive study that will address a societal issue that impacts a large fraction of the human population. Additionally, the project will be of interest for architectural and structural engineering, and will be impactful in many ways including the: (1) the cross-pollination of a few different disciplines such as acoustics, nonlinear dynamics, and architectural engineering; (2) supervision of a diverse pool of students with skills in computation and experimentation; (3) integration of the research findings into a multidisciplinary education program to engage senior undergraduates, professional M.S. and graduate students; (4) outreach and dissemination activities to inform the academic community, professional engineers, professionals and some general young audience of the economic and societal impacts of designing better acoustic barriers using the novel concepts of acoustic metamaterials. Like their electrical counterpart, acoustic diodes offer low resistance to sound in one direction and high resistance in the opposite direction. In other words, acoustic diodes offer the opportunity to forbid sound transmission along one direction. The hypothesis of this research is that a diode, embedded in the novel architectural material, can be scaled at multiple lengths to shield indoor noise and eventually transit-generated noise. The new noise barrier will be composed of three elements: a membrane, an acoustic diode made of 1-D chains of spherical particles with intruders, and a plate. The idea is that the noise to be shielded reaches the wall and is converted into vibration in the membrane. This vibration triggers the formation and propagation of nonlinear solitary waves along the diode where they are trapped and decay by the effect of multiple reflections. The merit of this project lies in the investigation of the fundamental physical concepts that will lead to the development of a novel architectural noise barrier.

声学噪声是污染的最巧妙形式，因为它对人类健康的影响被低估了。暴露于噪声可能会阻碍神经系统，触发压力和睡眠障碍，并可能导致心脏问题和高血压。人们几乎在任何地方都会暴露于噪音。因此，工程师和建筑师努力创建有效而精细的解决方案来减轻室内生成的噪音，以增强居住者的舒适度，提高工作场所的人员效率，确保隐私并提供无干扰空间。考虑到这个社会问题，这项对探索性研究（急切）项目的早期概念赠款将基于声学二极管的概念来探索一个新的建筑系统。渴望的结果将使能够进行一项全面的研究，该研究将解决一个影响大部分人口的社会问题。此外，该项目将引起建筑和结构工程的关注，并在许多方面都具有影响力，包括：（1）诸如声学，非线性动力学和建筑工程等几个不同学科的交叉授粉； （2）监督具有计算和实验技能的各种学生的监督； （3）将研究结果集成到多学科教育计划中，以吸引高级本科生，专业硕士和研究生； （4）宣传和传播活动，以告知学术界，专业工程师，专业人士和一些年轻受众，以使用声学超材料的新颖概念来设计更好的声学屏障的经济和社会影响。像电气对应物一样，声学二极管在一个方向上具有低阻力，并且在相反的方向上具有高电阻。换句话说，声学二极管提供了沿一个方向禁止声音传输的机会。这项研究的假设是，嵌入在新型建筑材料中的二极管可以以多长度缩放以屏蔽室内噪声，并最终产生的噪声。新的噪声屏障将由三个元素组成：一个膜，由带有入侵者的球形颗粒的1-D链制成的声学二极管和一个板。这个想法是，要屏蔽的噪声到达墙壁，并将其转化为膜上的振动。这种振动触发了沿二极管沿二极管的非线性孤立波的形成和繁殖，并通过多种反射的效果捕获并腐烂。该项目的优点在于研究将导致新型建筑噪声障碍发展的基本物理概念。