A New Minimization Quantity for Global Active Structural / Acoustic Control

该奖项的研究目标是开发一种主动噪声控制方法，以最小化声辐射的方式感知和控制结构。 存在许多应用，其中期望减少从振动结构辐射到封闭声场（诸如车辆舱室）中的噪声。 这项研究建立在一个新开发的衡量振动，被称为复合速度。 由于结构振动和辐射功率不直接相关，因此使用标准振动测量用于主动控制系统不会导致声辐射的最小化。 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上是相当均匀的，使得该方法对传感器位置不太敏感。 这些特性将在复杂结构中得到利用，该方法将用于包括肋板和圆柱壳的结构，这些结构通常用于车辆和飞机机身等重要应用。如果成功，这项研究的结果将为减少许多应用中的噪声暴露提供紧凑，有效的解决方案，例如车辆座舱（汽车、机车发动机和重型设备舱）以及飞机舱。 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，增加舒适度，减少噪音疲劳，并提高车辆乘员的安全性。 研究生和本科理工科学生将受益于参与研究和课堂教学的基础上的研究。 研究结果将分发给科学界，使其他人能够探索和进一步开发该方法，并为商业开发提供机会。

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.