Abstract
Estimating sonic boom noise levels during community noise testing of low-boom supersonic aircraft such as the NASA X-59 can be challenging because of bandwidth limitations caused by ambient noise contamination of boom recordings. This paper describes the effect of spectral bandwidth limitations on a candidate sonic boom metric for community response: the perceived level (PLdB). This metric was calculated using spectral data of measured sonic booms from NASA’s Quiet Supersonic Flights 2018 (QSF18) test campaign. Spectral data were obtained using a 650 ms time window for both the boom and the ambient recordings, with the ambient recording immediately preceding the detected boom, and the measurement bandwidth estimated using the signal-to-noise ratio (SNR) at each frequency. Analysis of several booms at four different measurement stations, each with several measurement configurations, shows that not accounting for limited bandwidth can add several decibels to the sonic boom metrics. The effects of measurement location and instrumentation are discussed. Future work may include developing methods for how to account for limited bandwidth, including potential filtering and spectral extrapolation methods. [Work supported by NASA Langley Research Center through the National Institute of Aerospace.]
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