Volpe National Transportation Systems Center, 55 Broadway, Cambridge, Massachusetts 02142, USA.
Brigham Young University, N281 ESC, Provo, Utah 84602, USA.
JASA Express Lett. 2022 Oct;2(10):104001. doi: 10.1121/10.0014414.
Sonic boom measurements from recent flight tests have provided an opportunity to investigate effects of microphone installation on sonic boom waveforms, spectra, and metric levels in support of NASA X-59 flight test planning. While those flight tests used N-wave aircraft (F-18s), modeling studies were also conducted using source characteristics for a shaped low-boom aircraft. Of particular interest were the effects of receiver height on boom waveforms and metrics at elevated receiver positions, microphone installation, and local ground cover type. Reductions of more than 2 dB in A-weighted sound exposure level and perceived level were shown for 1.6 ft (0.48 m) microphone heights for 35º ray elevation angle. Measured and modeled results are described in this letter.
最近的飞行测试中的音爆测量提供了一个机会，可以研究麦克风安装对音爆波形、频谱和度量级别的影响，以支持 NASA X-59 飞行测试计划。虽然这些飞行测试使用了 N 波飞机（F-18），但还使用了形状低爆音飞机的源特性进行了建模研究。特别感兴趣的是接收器高度对在较高接收器位置、麦克风安装和局部地面覆盖类型的音爆波形和度量的影响。对于 35°射线仰角，1.6 英尺（0.48 米）的麦克风高度可将 A 加权声暴露级和感知级降低超过 2dB。本文描述了测量和建模结果。
