Acoustic and Vibration Response of Flow-Excited Panels: Laboratory Reproduction and Panel Configuration Studies

外部湍流边界层（TBL）在飞机飞行过程中始终存在于机身周围，是喷气式飞机巡航飞行中客舱噪声的主要来源。在长时间的接触下，高噪音水平会导致听力丧失、疲劳、注意力不集中，并会影响呼吸频率、心脏功能和中枢神经系统。大多数飞机制造商对更好地理解与飞机声学相关的物理学感兴趣。尽管人们的兴趣日益浓厚，但对飞机中tbl引起的噪声的机制仍缺乏了解。此外，在飞行中测量飞机噪声是非常昂贵和耗时的，因此，飞行条件的实验室再现近年来受到越来越多的关注。在此背景下，本研究计划旨在推进当前最先进的技术，以理解与tbl引起的噪声相关的物理，以及tbl激发飞机面板的声学和振动响应的实验室再现。压电（PZT）致动器战略性地嵌入在测试面板中，将用于激励结构，以重现面板对TBL的响应。我们将对不同的面板配置进行测试和分析，以找出达到降噪目标的最佳配置。拟议的研究将创建一个实验平台，使开发一种可靠的方法，用于tbl激发板的声学和振动响应的实验室再现。实验数据的可用性将允许验证用于预测tbl激励结构的噪声和振动的计算方法。这项研究的成功结果将带来涉及创新技术发展的极有价值的知识，这些知识可以应用于加拿大和国际上的飞机工业。该技术的应用将为航空工业带来经济上的优势。此外，更好地理解tbl激励结构的实验和计算分析将有利于许多其他领域，如管道中的流体流动、发动机吊舱设计和汽车工业。

The external turbulent boundary layer (TBL), always present around the fuselage of an aircraft during flight, is typically the major source of jet aircraft cabin noise in cruise flight. During long exposure periods, high noise levels produce hearing loss, fatigue, loss of concentration, and can influence the respiratory rate, heart functions and central nervous system. Most aircraft manufacturers are interested in a better understanding of the physics associated with aircraft acoustics. In spite of the growing interest, there is still a lack of understanding of the mechanisms involved in TBL-induced noise in aircraft. Furthermore, in-flight measurements of aircraft noise are extremely costly and time-consuming, and therefore, the laboratory reproduction of in-flight conditions has attracted more attention in recent years. In this context, the present research proposal aims to advance the current state-of-the-art in the understanding of the physics associated with TBL-induced noise, and the laboratory reproduction of the acoustic and vibration response of TBL-excited aircraft panels. Piezoelectric (PZT) actuators, strategically embedded in the test panel, will be used to excite the structure, to reproduce the panel response to the TBL. Different panel configurations will be tested and analyzed, to investigate the best configuration for the noise reduction goal. The proposed research will create an experimental platform that enables the development of a solid methodology for the laboratory reproduction of the acoustic and vibration response of TBL-excited panels. The availability of experimental data will allow the validation of computational approaches for the prediction of noise and vibration of TBL-excited structures. The successful outcome of this research will bring extremely valuable knowledge involving the development of innovative technology, which can be applied to the aircraft industry, in Canada and internationally. The availability of this technology will bring an economic advantage to aircraft industry. In addition, a better understanding in both experimental and computational analysis of TBL-excited structures would benefit numerous other areas, such as, fluid flow in pipes, engine nacelle design, and the automotive industry.