The Journal of the Acoustical Society of Korea (한국음향학회지)

The Acoustical Society of Korea (한국음향학회)
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Comparative analysis of noise from three Falcon 9 launches

Falcon 9 로켓 3회 발사 소음의 비교 분석

  • Mathews, Logan T. (Brigham Young University) ;
  • Gee, Kent L. (Brigham Young University) ;
  • Hart, Grant W. (Brigham Young University) ;
  • Rasband, Reese D. (Brigham Young University) ;
  • Novakovich, Daniel J. (Brigham Young University) ;
  • Irarrazabal, Francisco I. (Brigham Young University) ;
  • Vaughn, Aaron B. (Brigham Young University) ;
  • Nelson, Pauline (Brigham Young University - Idaho)
  • Received : 2020.06.17
  • Accepted : 2020.07.20
  • Published : 2020.07.31
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Abstract

This study investigates the far-field noise from three Falcon 9 vehicle launches from Vandenberg Air Force Base, CA, USA, as measured from the same location within the nearby community of Lompoc. The overall sound pressure levels for the three launches are shown to be similar, but some differences in the early launch period are thought to be weather-related. The peak directivity angle in overall level is approximately 65 deg, which is consistent with horizontally-fired, static rocket data. For the third launch, waveforms and spectra are analyzed for different events during the launch sequence. The measured spectral bandwidth decreases with time, but spectral levels remain above the ambient noise throughout the main-engine firing. Additionally, late-launch phenomena observed in the data appear to be correlated with main-engine cutoff and second-stage engine start.

본 연구에서는 미국 캘리포니아주 소재 반덴버그 공군기지(Vandenberg Air Force Base)에서 3차례 발사된 Falcon 9의 원거리장 소음에 대해 논하였다. 발사 소음은 3회 모두 롬폭(Lompoc) 도시 인근의 동일 위치에서 측정되었다. 전체 음압레벨(overall sound pressure level)은 3회 모두 유사하지만 기상조건과 관련된 차이점이 발사 초반부에 관찰되었다. 음압레벨 기준 최대 지향성은 약 65°로서 수평 정적 연소시험으로부터 얻어진 결과와 일치하였다. 세번째 발사 소음에 대하여 각 발사 단계에 따른 파형 및 스펙트럼을 분석하였다. 1단 엔진 추진 구간에서 소음의 대역폭은 시간에 따라 감소하였으나 그 크기는 모든 주파수에 걸쳐 주변 소음레벨을 상회하였다. 또한, 발사 후반부 데이터에서 관찰되는 특이 경향은 1단 엔진 정지 및 2단 로켓 점화와 연관이 있는 것으로 추정되었다.

Keywords

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