An Acoustic Boundary Control Method for Suppressing Structural Sound Radiation

减少直升机、固定翼飞机和陆地车辆等封闭环境中的室内声辐射是一个非常重要的问题。有两种主流技术可以处理这个问题。一种是使用扬声器的有源消声方法(ANC)，另一种是通过结构控制降低声辐射的策略(通常称为主动结构声学控制或ASAC)。该研究项目致力于发展声边界控制方法的数学理论，并通过分析和实验证明一种新的声边界驱动方法相对于现有方法的优势。具体的研究任务包括研究声边界控制的空间特征；开发神经网络以选择最佳空间构型；开发用于实施声边界控制的传感和执行装置的硬件原型；结合声边界控制战略评价现有的前馈自适应和反馈控制算法。这一研究项目所取得的成果将有助于开发消除车辆内部噪声的技术，并为开发降低外部噪声辐射的技术奠定重要的理论基础。

Reduction of interior sound radiation in enclosed environments such as in helicopters, fixed-wing aircraft and land vehicles is a very important problem. There are two mainstream techniques for dealing with this problem. One is the active noise cancellation method (ANC) using loudspeakers, and the other is sound radiation reduction strategy via structural controls (often called active structural acoustic control or ASAC). This research project deals with the development of a mathematical theory for the acoustic boundary control method and to analytically and experimentally demonstrate the advantages of a new acoustic boundary actuation method over the existing ones. The specific research tasks include a study of the spatial characteristics of acoustic boundary control; development of a neural network for selecting optimal spatial configurations; development of hardware prototypes of sensing and actuation devices for implementing acoustic boundary control; and evaluation of existing feedforward adaptive and feedback control algorithms in conjunction with the acoustic boundary control strategy. The results obtained from this research project will lead to the development of technologies for eliminating interior noise of the vehicles, and the generation of important theoretical groundwork that will enable technology development for reducing exterior noise radiation.