Noise Shielding Assessment of Hybrid Wing-Body Aircraft Configurations
Noise Shielding Assessment of Hybrid Wing-Body Aircraft Configurations
复制标题
混合翼身飞机配置的噪声屏蔽评估
DOI：
10.2514/1.j050780
复制
发表时间：
2011
期刊：
影响因子：
--
通讯作者：
Z. Spakovszky
中科院分区：
文献类型：
--
作者：
L. W. Ng;Z. Spakovszky
本文提出了一种基于基尔霍夫衍射理论的方法来预测先进飞机配置的机身对涡轮机械噪声的屏蔽。该方法的主要特点是计算速度快，即使在非常高的频率下也是如此，这使其成为快速评估飞机设计噪声足迹的有用工具。离线部分根据源视线将三维屏蔽几何体预处理成其轮廓线。给定该轮廓，在线部分计算特定观察者位置和源频率处的噪声衰减，并且可以由飞机噪声预测程序多次调用，以将屏蔽估计添加到其有效感知噪声水平计算中。该方法对于以边缘衍射射线为特征的平面屏蔽物体最为准确，而不是以蠕变射线为特征的平滑、圆形物体；在使用球体和圆盘的计算中观察到高达 3 dB 的屏蔽差异。最后，将该方法应用于混合翼身飞机，以评估和量化其大平面面积的噪声屏蔽效益。
This paper presents amethod based on theKirchhoff diffraction theory to predict the shielding of turbomachinery noise by the airframe of an advanced aircraft configuration. The key feature of this method is the fast computational time, even at very high frequencies, which makes it a useful tool to rapidly assess the noise footprint of an aircraft design. The offline part preprocesses the three-dimensional shielding geometry into a contour of its outline based on the source line of sight. Given this contour, the online part calculates the noise attenuation at a particular observer location and source frequency and can be called multiple times by an aircraft noise prediction program to add shielding estimates to its effective perceived noise level calculations. This method is most accurate for flat shielding objects characterized by edge-diffraction rays, rather than smooth, rounded objects characterized by creeping rays; shielding differences of up to 3 dB were observed in calculations using a sphere and a disk. Finally, the method is applied to a hybrid wing-body aircraft to assess and quantify the noise shielding benefit of its large planform area.