A New Minimization Quantity for Global Active Structural / Acoustic Control

全局主动结构/声学控制的新最小化量

• 批准号: 1130482
• 负责人: Scott Sommerfeldt
• 金额: $ 34.2万
• 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: 2011
• 资助国家: 美国
• 起止时间: 2011-10-01 至 2014-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1130482&HistoricalAwards=false
• 关键词: New; Minimization; Quantity; Global; Active

The research objective of this award is to develop an active noise control method that senses and controls a structure in a manner that minimizes acoustic radiation. There are numerous applications where it is desirable to reduce noise radiated from vibrating structures into an enclosed acoustic field, such as a vehicle cabin. The research builds on a newly developed measure of vibration that is referred to as composite velocity. The use of standard vibration measurements for active control systems does not result in a minimization of acoustic radiation, since the structural vibration and the radiated power are not directly correlated. However, composite velocity is directly correlated with acoustic radiation. Furthermore, the composite velocity is quite uniform across the structure, making the method less sensitive to sensor location. These properties will be exploited in complex structures, and the method will be developed for structures including ribbed plates and cylindrical shells, which are typical for important applications such as vehicles and aircraft fuselages.If successful, the results of this research will provide a compact, efficient solution for reducing noise exposure in numerous applications, such as vehicle cabins (automobiles, locomotive engines, and heavy equipment cabins) as well as aircraft cabins. The advantage of this active control approach is that there is little sensitivity to sensor location (meaning the sensor can largely be placed wherever convenient), the system is compact, and the method achieves global reduction of the enclosed sound field. This will result in improved communication, increased comfort, reduced noise fatigue, and improved safety for vehicle occupants. Graduate and undergraduate science and engineering students will benefit through involvement in the research and classroom instruction based on the research. Results will be disseminated to the scientific community, allowing others to explore and further develop the method, as well as providing opportunities for commercial development.

该奖项的研究目标是开发一种主动噪声控制方法，以最大限度地减少声辐射的方式感知和控制结构。在许多应用中，希望减少从振动结构辐射到封闭声场中的噪声，例如车辆驾驶室。这项研究建立在一种新开发的振动测量方法--复合速度上。对于主动控制系统使用标准振动测量并不会导致声辐射最小化，因为结构振动和辐射功率并不直接相关。然而，复合速度与声辐射直接相关。此外，复合速度在整个结构中相当均匀，使得该方法对传感器位置的敏感度较低。这些特性将被用于复杂的结构，这种方法将被开发用于包括肋板和圆柱壳在内的结构，这些结构是车辆和飞机机身等重要应用的典型应用。如果成功，这项研究的结果将为减少车辆舱(汽车、机车发动机和重型设备舱)以及飞机舱等许多应用中的噪声暴露提供一种紧凑、高效的解决方案。这种主动控制方法的优点是对传感器位置的敏感性很小(即传感器基本上可以放置在任何方便的地方)，系统紧凑，并且该方法实现了封闭声场的全局减小。这将改善通信，增加舒适性，减少噪音疲劳，并提高车辆乘员的安全性。理工科研究生和本科生将通过参与研究和基于研究的课堂教学而受益。结果将传播给科学界，允许其他人探索和进一步开发该方法，并为商业发展提供机会。