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，该方法以最小化声学辐射的方式感知和控制结构。 在许多应用程序中，希望将振动结构辐射到封闭的声场（例如车辆舱）中散发出噪声。 该研究基于新开发的振动度量，称为复合速度。 在主动控制系统中使用标准振动测量值不会导致声辐射的最小化，因为结构振动和辐射功率没有直接相关。 但是，复合速度与声学辐射直接相关。 此外，整个结构的复合速度非常均匀，使该方法对传感器位置的敏感程度降低。 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. 这种主动控制方法的优点是，对传感器位置的敏感性很小（这意味着传感器可以在很大程度上放置在方便的地方），系统是紧凑的，并且该方法实现了封闭的声场的全局降低。 这将导致改善沟通，增加舒适度，减轻噪音疲劳以及改善车辆乘员的安全性。 研究生和本科科学和工程专业的学生将通过基于研究的研究和课堂教学而受益。 结果将被传播到科学界，使其他人能够探索和进一步开发该方法，并为商业发展提供机会。