Acoustical and Structural Energy Based Methods to Minimize Acoustic Radiation

基于声学和结构能的方法来最小化声辐射

• 批准号: 0826554
• 负责人: Scott Sommerfeldt
• 金额: $ 21.97万
• 依托单位: Brigham Young University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-09-15 至 2010-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0826554&HistoricalAwards=false
• 关键词: Acoustical; Structural; Energy; Based; Methods

Many scenarios exist that involve vibrating structures radiating sound into an interior field, including interior aircraft noise, noise in the cabins of automobiles and other vehicles, and transmission between two adjoining rooms. The proposed research focuses on developing three active noise control approaches for minimizing the sound field created by vibrating structures radiating into enclosed sound fields. The three approaches consist of: i) minimizing the acoustic energy density at discrete locations in the acoustic field, ii) minimizing the structural energy density at discrete locations on the vibrating structure, and iii) minimizing the structural power flow at discrete locations on the vibrating structure. The effectiveness of each approach for minimizing the interior acoustic field will be compared and contrasted. Relationships and correlations between the three measured quantities in the control approaches will be developed. A greater understanding of the coupling that exists between the acoustic energy (in the enclosed field) and the structural energy (in the vibrating structure) will also be acquired. This project will advance scientific knowledge through the discovery of new energy-based relationships, control techniques, and measurement techniques. This research has potential for significant societal benefits by enhancing noise control techniques in applications ranging from room acoustics, to an aircraft fuselage, to vehicle cabs. Through this research, future professionals will be trained with strong research skills and broad backgrounds in acoustics and structural dynamics. These two disciplines are often considered separately but this project will couple them in approaching new and innovative ideas. Graduate and undergraduate students will be involved on teams, and will learn to effectively interact with one another. The teams will be supported and encouraged to publish and present their research at technical meetings. A relatively large number of female students have participated in the research group. The PIs will continue to encourage additional female and minority students to become involved. The objective is to continue to teach those involved with the group the importance and strength of having a broad and diverse research group. Numerous K-12 groups visit our facilities each year, and will see and be exposed to this work as a highlight of the research at BYU.

存在许多涉及振动结构将声音辐射到室内场的场景，包括内部飞机噪音，汽车和其他车辆的机舱中的噪音以及两个相邻房间之间的传播。拟议的研究重点是开发三种主动噪声控制方法，以最大程度地减少通过振动结构辐射到封闭的声场中创建的声场。 这三种方法包括：i）最大程度地减少声场离散位置处的声能密度，ii）最小化振动结构上离散位置处的结构能密度，以及iiii）最小化振动结构上离散位置的结构功率流量。 每种方法最小化内部声场的有效性将被比较并对比。将开发控制方法中三个测得的数量之间的关系和相关性。还将获取对声能（在封闭场中）和结构能（在振动结构中）之间存在的耦合的更深入的了解。该项目将通过发现新的基于能量的关系，控制技术和测量技术来推进科学知识。这项研究通过增强从房间声学到飞机机身再到车辆出租车等应用中的噪声控制技术来获得重大社会利益。通过这项研究，未来的专业人员将接受强大的研究技能和广泛的声学和结构动态培训。这两个学科经常被分开考虑，但该项目将使它们融入到新的创新思想中。研究生和本科生将参与团队，并将学会有效地互动。这些团队将得到支持和鼓励在技术会议上发布和介绍他们的研究。相对较大的女学生参加了研究小组。 PI将继续鼓励更多的女学生参与其中。目的是继续教授与该小组相关的人拥有一个广泛而多样化的研究小组的重要性和力量。 每年有许多K-12小组访问我们的设施，并将看到并接触这项工作，这是BYU研究的亮点。