Acoustical and Structural Energy Based Methods to Minimize Acoustic Radiation

存在许多情况，涉及将声音辐射到内场的振动结构，包括内部飞机噪音、汽车和其他车辆舱内的噪音以及两个相邻房间之间的传输。提出的研究重点是开发三种主动噪声控制方法，以最小化辐射到封闭声场中的振动结构所产生的声场。这三种方法包括：i)最小化声场中离散位置处的声能量密度，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。将对每种方法最小化内部声场的有效性进行比较和对比。将建立控制方法中三个测量量之间的关系和相互关系。我们还将更好地理解声能(在封闭的声场中)和结构能量(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源的关系、控制技术和测量技术来促进科学知识的发展。这项研究通过在从房间声学到飞机机身再到车辆驾驶室的各种应用中增强噪音控制技术，具有显著的社会效益。通过这项研究，未来的专业人员将被培养成具有强大的研究技能和广泛的声学和结构动力学背景。这两个学科通常被分开考虑，但这个项目将把它们结合在一起，接近新的和创新的想法。研究生和本科生将参与到团队中，并将学习如何有效地彼此互动。将支持和鼓励这些小组在技术会议上发表和介绍他们的研究成果。参加课题组的女生人数相对较多。私立学校将继续鼓励更多的女性和少数族裔学生参与进来。其目的是继续向参与该小组的人传授拥有一个广泛和多样化的研究小组的重要性和力量。每年，许多K-12团队都会访问我们的设施，并将看到并接触到这项工作，作为杨百翰大学研究的一个亮点。

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.