Van Komen David F, Harker Blaine M, Neilsen Tracianne B, Gee Kent L, Hales Swift S, Wall Alan T, Micah Downing J, James Michael M
Department of Physics and Astronomy, Brigham Young University, Provo, Utah 84602, USA.
Battlespace Acoustics Branch, Air Force Research Laboratory, Wright-Patterson AFB, Ohio 45433, USA.
J Acoust Soc Am. 2020 May;147(5):3550. doi: 10.1121/10.0001260.
Noise from a tactical aircraft can impact operations due to concerns regarding military personnel noise exposure and community annoyance and disturbance. The efficacy of mission planning can increase when the distinct, complex acoustic source mechanisms creating the noise are better understood. For each type of noise, equivalent acoustic source distributions are obtained from a tied-down F-35B operating at various engine conditions using the hybrid method for acoustic source imaging of Padois, Gauthier, and Berry [J. Sound Vib. 333, 6858-6868 (2014)]. The source distributions for the distinct noise types are obtained using different sections of a 71 element, ground-based linear array. Using a subarray close to the nozzle exit plane, source distributions are obtained for fine-scale turbulent mixing noise and broadband shock-associated noise, although grating lobes complicate interpretations at higher frequencies. Results for a subarray spanning the maximum sound region show that the multiple frequency peaks in tactical aircraft noise appear to originate from overlapping source regions. The observation of overlapping spatial extent of competing noise sources is supported by the coherence properties of the source distributions for the different subarrays.
战术飞机产生的噪音可能会对作战行动产生影响，这是因为涉及军事人员的噪音暴露以及对社区的干扰和烦扰问题。当能够更好地理解产生噪音的独特、复杂的声源机制时，任务规划的效率就可以提高。对于每种类型的噪音，使用帕多瓦、高蒂尔和贝里[《声学学报》333, 6858 - 6868(2014)]的声源成像混合方法，从在各种发动机工况下停机的F - 35B获取等效声源分布。使用一个由71个元素组成的地面线性阵列的不同部分来获取不同噪音类型的声源分布。使用靠近喷管出口平面的子阵列，可以获得精细尺度湍流混合噪音和宽带激波相关噪音的声源分布，不过在较高频率下，栅瓣会使解释变得复杂。跨越最大声音区域的子阵列的结果表明，战术飞机噪音中的多个频率峰值似乎源自重叠的声源区域。不同子阵列声源分布的相干特性支持了对相互竞争的噪音源空间范围重叠的观察结果。
