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Research Article

Comparative analysis of noise from three Falcon 9 launches

Falcon 9 로켓 3회 발사 소음의 비교 분석

Logan T. Mathews1
,
Kent L. Gee1∗
,
Grant W. Hart1
,
Reese D. Rasband1
,
Daniel J. Novakovich1
,
Francisco I. Irarrazabal1
,
Aaron B. Vaughn1
,
Pauline Nelson2
1Brigham Young University
2Brigham Young University - Idaho
∗Corresponding Author
31 July 2020. pp. 322-330
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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.

Keywords
Rocket noise
Launch vehicle noise
Outdoor sound
Infrasound propagation

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.

키워드
로켓 소음
발사체 소음
실외 소음
초저음파 전파
References
1
S. A. McInerny, "Rocket noise-A review," Proc. 13th Aeroacoustics Conf. AIAA-90-3981 (1990).
10.2514/6.1990-39812108261
2
S. A. McInerny, "Launch vehicles acoustics. I. Overall levels and spectral characteristics," J. Aircr. 33, 518-523 (1996).
10.2514/3.46975
3
S. A. McInerny, "Launch vehicle acoustics. II. Statistics of the time domain data," J. Aircr. 33, 511-517 (1996).
10.2514/3.46974
4
S. A. McInerny and S. M. Olcmen, "High-intensity rocket noise: Nonlinear propagation, atmospheric absorption, and characterization," J. Acoust. Soc. Am. 117, 578-591 (2005).
10.1121/1.184171115759679
5
W. H. Mayes, W. E. Lanford, and H. H. Hubbard, "Near-field and far-field noise surveys of solid-fuel rocket engines for a range of nozzle exit pressures," NASA Tech. Note, D-21, 1959.
6
K. M. Eldred, "Acoustic loads generated by the propulsion system," NASA SP-8072, 1971.
7
M. M. James, A. R. Salton, K. L. Gee, T. B. Neilsen, and S. A. McInerny, "Full-scale rocket motor acoustic tests and comparisons with empirical source models," Proc. Mtgs. Acoust. 18, 040007 (2012).
8
M. M. James, A. R. Salton, K. L. Gee, T. B. Neilsen, S. A. McInerny, and R. J. Kenny, "Modification of directivity curves for a rocket noise model," Proc. Mtgs. Acoust. 18, 040008 (2012).
9
R. J. Kenny, C. Hobbs, K. Plotkin, and D. Pilkey, "Measurement and characterization of Space Shuttle solid rocket motor plume acoustics," AIAA paper, 2009-3161 (2009).
10.2514/6.2009-3161
10
J. N. Cole, H. E. von Gierke, D. T. Kyrazis, K. M. Eldred, and A. J. Humphrey, "Noise radiation from fourteen types of rockets in the 1,000 to 130,000 pounds thrust range," WADC Tech. Rep., 57-354, 1957.
11
W. L. Donn, E. Posmentier, U. Fehr, and N. K. Balachandran, "Infrasound at long range from Saturn V, 1967," Science, 162 (3858), 1116-1120 (1968).
10.1126/science.162.3858.111617746816
12
G. Kaschak, W. L. Donn, and U. Fehr, "Long‐range infrasound from rockets," J. Acoust. Soc. Am. 48, 12-20 (1970).
10.1121/1.1912102
13
P. Blom, O. Marcillo, and S. Arrowsmith, "Analysis and modeling of infrasound from a four-stage rocket launch," J. Acoust. Soc. Am. 139, 3134-3138 (2016).
10.1121/1.495381727369137
14
"Falcon User's Guide," Space Exploration Technologies Corp. SpaceX, 2019.
15
D. Rind and W. L. Donn, "Further use of natural infrasound as a continuous monitor of the upper atmosphere," J. Atmos. Sci. 32, 1694-1704 (1975).
10.1175/1520-0469(1975)032<1694:FUONIA>2.0.CO;2
16
M. Muhlestein, K. L. Gee, T. B. Neilsen, and D. C. Thomas, "Prediction of nonlinear propagation of noise from a solid rocket motor," Proc. Mtgs. Acoust. 18, 040006 (2012).
10.1121/1.4828827
17
K. L. Gee, V. W. Sparrow, M. M. James, J. M. Downing, C. M. Hobbs, T. B. Gabrielson, and A. A. Atchley, "The role of nonlinear effects in the propagation of noise from high-power jet aircraft," J. Acoust. Soc. Am. 123, 4082 (2008).
10.1121/1.290387118537360
Information
  • Publisher :The Acoustical Society of Korea
  • Publisher(Ko) :한국음향학회
  • Journal Title :The Journal of the Acoustical Society of Korea
  • Journal Title(Ko) :한국음향학회지
  • Volume : 39
  • No :4
  • Pages :322-330
  • Received Date : 2020-06-17
  • Accepted Date : 2020-07-20
  • DOI :https://doi.org/10.7776/ASK.2020.39.4.322
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