Study of the Empirical Turbulent Boundary Layer Models for Aircraft Cabin Noise Prediction

在飞行过程中，飞机机舱内的高水平噪音和振动会对人体健康和整体飞行舒适度产生负面影响。在长途飞行中，这个问题变得更加严重，影响到机组人员和乘客。在过去的几年里，人们对飞机客舱噪声和振动的研究越来越感兴趣。引起这种兴趣的主要原因是由于巡航飞行速度的增加导致巡航期间飞机机舱噪音的增加。此外，由于正在考虑新的飞机设计，机舱噪音需要在设计过程的早期阶段得到解决。为了减轻重量，新材料越来越多地应用于飞机结构，这也将影响飞机机舱的噪音和振动水平。因此，对更好地理解和预测飞机内部噪音的需求增加了，对开发和设计更好的降噪技术的兴趣也增加了。在典型客运飞机的巡航飞行中，在机身外蒙皮上形成的湍流边界层（TBL）是客舱噪声的主要来源。由于TBL壁面压力分布具有随机性，通常采用经验模型进行数学描述。尽管存在几种经验模型来提供TBL壁面压力分布，但所有模型都提供了不同的预测，因此，TBL激励的经验描述仍然是研究的主题。考虑到这一问题，本文旨在研究在风洞中测试的面板表面上发生的TBL壁面压力波动。随后将获得的实验结果与通过经验模型获得的预测数据进行比较，从而确定哪个模型更符合风洞测量结果。

High levels of noise and vibration in aircraft cabin, experienced during flight, are associated with negative effects in human health and overall flight comfort. This problem becomes even more significant during long flights, affecting crew and passengers. In the past few years, the level of interest in aircraft cabin noise and vibration research has increased. The main cause for this interest is related to the fact that increased cruise flight speeds have resulted in higher levels of aircraft cabin noise during cruise. Additionally, as novel aircraft designs are being considered, cabin noise will need to be addressed in the early phases of the design process. New materials are progressively being more applied in aircraft structures for reduced weight, which will also impact aircraft cabin noise and vibration levels. As such, the need for better understanding and predicting aircraft interior noise has increased, as well as the interest in the development and design of better noise reduction techniques. During cruise flight of a typical passengers' aircraft, the turbulent boundary layer (TBL), developed over the external fuselage skin, represents the major source of cabin noise. Being of random nature, the TBL wall pressure distribution is usually mathematically described through empirical models. Even though several empirical models exist to provide the TBL wall pressure distribution, all the models provide dissimilar predictions, and therefore, the empirical description of the TBL excitation remains and ongoing topic of research. Considering this problem, the present proposal aims to investigate the TBL wall pressure fluctuations developed over the surface of a panel tested in wind tunnel. Experimental results obtained will subsequently be compared with the predicted data obtained through empirical models, allowing the identification of which model(s) better matches the wind tunnel measurements.