Development of Acoustic Energy Concepts to Characterize and Control Acoustic Fields

发展声能概念来表征和控制声场

• 批准号: 0409319
• 负责人: Scott Sommerfeldt
• 金额: --
• 依托单位: Brigham Young University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-06-15 至 2008-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0409319&HistoricalAwards=false
• 关键词: Development; Acoustic; Energy; Concepts; Characterize

DEVELOPMENT OF ACOUSTIC ENERGY CONCEPTS TO CHARACTERIZE AND CONTROL ACOUSTIC FIELDSSommerfeldt, Leishman, and BlotterAbstractOver the past twenty years, acoustic intensity techniques have led to significant improvements in the understanding and characterization of acoustic fields. However, several fundamental questions associated with acoustic energy quantities, and their significance in characterizing and controlling sound fields still exist. This project will focus on investigating several energy quantities in enclosed sound fields to more fully understand their spatial dependence and how energy-based sensing and actuation can be used advantageously in a number of important applications. The specific objectives are: (1) Energy quantities including acoustic energy density, Lagrangian density, and their spatial derivatives will be analyzed in depth, as they apply to enclosed sound fields; (2) measurement techniques will be developed for measuring sound power, both in ideal (anechoic and diffuse) acoustic fields, as well as more general acoustic environments; (3) advanced active noise control concepts will be developed that further use energy-based measurements to improve the global control of acoustic fields; and (4) sound field equalization techniques will be developed using energy-based measurements and adaptive signal processing. This research will couple analytical, numerical, and experimental investigations. First, an understanding of the spatial dependence of these energy quantities and their spatial derivatives will be investigated analytically to identify the best energy quantities to measure for the different applications. Numerical work will extend these concepts to non-ideal conditions, and will be used to investigate how these energy-based concepts could be used in the target applications, and how they would be expected to perform. Finally, experimental verification of the concepts developed will be performed. This project will advance scientific knowledge through the discovery of new energy-based relationships 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. Through this research, future professionals will be trained with strong research skills and broad backgrounds in acoustics and structural dynamics. Graduate and undergraduate students will be involved on teams, and will learn to effectively interact with one another. These teams will be supported and encouraged to publish and present their research at technical meetings.

用于表征和控制声场的声能概念的发展Sommerfeldt、Leishman 和 Blotter 摘要 在过去的二十年中，声强度技术使人们对声场的理解和表征有了显着的进步。然而，与声能量相关的几个基本问​​题及其在表征和控制声场方面的重要性仍然存在。该项目将重点研究封闭声场中的多个能量，以更全面地了解它们的空间依赖性以及如何在许多重要应用中有利地使用基于能量的传感和驱动。具体目标是：（1）深入分析适用于封闭声场的能量量，包括声能密度、拉格朗日密度及其空间导数； (2) 将开发用于在理想（消声和扩散）声场以及更一般的声学环境中测量声功率的测量技术； (3) 将开发先进的主动噪声控制概念，进一步利用基于能量的测量来改善声场的全局控制； (4) 将利用基于能量的测量和自适应信号处理来开发声场均衡技术。这项研究将结合分析、数值和实验研究。首先，将对这些能量的空间依赖性及其空间导数进行分析研究，以确定针对不同应用进行测量的最佳能量。 数值工作将这些概念扩展到非理想条件，并将用于研究如何在目标应用中使用这些基于能量的概念，以及它们的预期表现如何。 最后，将对所开发的概念进行实验验证。该项目将通过发现新的基于能量的关系和测量技术来推进科学知识。这项研究通过增强从室内声学到飞机机身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。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。