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内部场的场景，包括飞机内部噪声、汽车和其他车辆车厢内的噪声以及两个相邻房间之间的传输。拟议的研究重点是开发三种主动噪声控制方法，以最大限度地减少振动结构辐射到封闭声场中产生的声场。 这三种方法包括：i) 最小化声场中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量密度，以及 iii) 最小化振动结构上离散位置处的结构功率流结构。 将比较和对比每种最小化内部声场方法的有效性。将开发控制方法中三个测量量之间的关系和相关性。还将更好地理解声能（在封闭场中）和结构能（在振动结构中）之间存在的耦合。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的发展。这项研究通过增强室内声学、飞机机身和车辆驾驶室等应用中的噪声控制技术，具有显着的社会效益。通过这项研究，未来的专业人员将获得强大的研究技能和广泛的声学和结构动力学背景的培训。这两个学科通常被分开考虑，但这个项目将把它们结合起来，以实现新的和创新的想法。研究生和本科生将参与团队活动，并学习如何有效地相互交流。我们将支持并鼓励这些团队在技术会议上发表和展示他们的研究成果。该研究小组中有较多的女学生参加。 PI 将继续鼓励更多的女性和少数族裔学生参与其中。目标是继续向该小组的参与者传授拥有广泛且多样化的研究小组的重要性和优势。 每年都有许多 K-12 团体参观我们的设施，并将看到并接触到这项作为杨百翰大学研究亮点的工作。