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.

描述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里，声强技术已经导致了对声场的理解和表征的显着改进。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中的意义仍然存在。该项目将重点研究封闭声场中的几种能量，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）将深入分析能量量，包括声能密度、拉格朗日密度及其空间导数，因为它们适用于封闭声场;（2）将开发测量技术，用于测量声功率，无论是在理想情况下，（消声和漫射）声场，以及更一般的声学环境;（3）将开发先进的主动噪声控制概念，进一步使用基于能量的测量来改进声场的全局控制;以及（4）将使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。这项研究将耦合分析，数值和实验研究。首先，这些能量量及其空间导数的空间依赖性的理解将进行分析研究，以确定最佳的能量量来测量不同的应用程序。 数值工作将这些概念扩展到非理想条件，并将用于研究这些基于能量的概念如何用于目标应用，以及它们将如何执行。 最后，实验验证的概念开发将进行。该项目将通过发现新的基于能源的关系和测量技术来推进科学知识。这项研究具有潜在的显着的社会效益，提高噪声控制技术的应用范围从室内声学飞机机身。通过这项研究，未来的专业人员将被培养具有较强的研究技能和广泛的背景声学和结构动力学。研究生和本科生将参与团队，并将学习有效地相互交流。将支持和鼓励这些小组在技术会议上发表和介绍其研究成果。