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.

中文翻译：

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表征战术飞机噪声源的不同组成部分。

由于担心军事人员的噪声暴露以及社区的烦恼和干扰，战术飞机的噪声可能会影响运营。当更好地理解产生噪声的独特，复杂的声源机制时，可以提高任务计划的效率。对于每种类型的噪声，使用Padois，Gauthier和Berry的声源成像混合方法，从在各种发动机工况下运行的束缚F-35B获得等效声源分布[J. 声音震撼。333，6858–6868（2014）]。使用71元素，基于地面的线性阵列的不同部分可获得不同噪声类型的源分布。使用靠近喷嘴出口平面的子阵列，可以获得源分布，用于细尺度的湍流混合噪声和与宽带冲击相关的噪声，尽管光栅波瓣使较高频率下的解释复杂化。跨越最大声音区域的子阵列的结果表明，战术飞机噪声中的多个频率峰值似乎源自重叠的源区域。不同子阵列的声源分布的相干性支持了竞争性噪声源重叠空间范围的观察。