Diffraction of sonic booms around buildings resulting in the building spiking effect

Sangik T. Cho, Victor Ward Sparrow

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The diffraction of a sonic boom around a building of finite dimensions yields amplification of the front shock and a positive spike that follows the tail shock in the pressure waveform recorded at the incident side of the building's exterior surface. This physical phenomenon is consistently found both in the data obtained from a 2006 NASA flight test and field experiment, and in the finite-difference time-domain simulation that models this particular experiment, and the authors call it the building spiking effect. This paper presents an analysis of the numerical and the accompanying experimental results used to investigate the cause of this effect. The simulation assumes linear acoustics only, which sufficiently describes the physics of interest. Separating the low and high frequency components of boom recordings using optimal finite impulse response filters with complementary magnitude responses shows that the building spiking effect can be attributed to the frequency dependent nature of diffraction. A comparison of the building spiking effect of a conventional N-wave and a low-amplitude sonic boom shows that a longer shock rise time leads to less pronounced amplification of the exterior pressure loading on buildings, and thus reveals an advantage of shaping a boom to elongate its rise time.

Original languageEnglish (US)
Pages (from-to)1250-1260
Number of pages11
JournalJournal of the Acoustical Society of America
Volume129
Issue number3
DOIs
StatePublished - Mar 1 2011

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sonic booms
spiking
diffraction
boom
shock
FIR filters
flight tests
shock fronts
spikes
Boom
waveforms
simulation
recording
low frequencies
physics
acoustics
causes
Simulation
Experiment
Amplification

All Science Journal Classification (ASJC) codes

  • Arts and Humanities (miscellaneous)
  • Acoustics and Ultrasonics

Cite this

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abstract = "The diffraction of a sonic boom around a building of finite dimensions yields amplification of the front shock and a positive spike that follows the tail shock in the pressure waveform recorded at the incident side of the building's exterior surface. This physical phenomenon is consistently found both in the data obtained from a 2006 NASA flight test and field experiment, and in the finite-difference time-domain simulation that models this particular experiment, and the authors call it the building spiking effect. This paper presents an analysis of the numerical and the accompanying experimental results used to investigate the cause of this effect. The simulation assumes linear acoustics only, which sufficiently describes the physics of interest. Separating the low and high frequency components of boom recordings using optimal finite impulse response filters with complementary magnitude responses shows that the building spiking effect can be attributed to the frequency dependent nature of diffraction. A comparison of the building spiking effect of a conventional N-wave and a low-amplitude sonic boom shows that a longer shock rise time leads to less pronounced amplification of the exterior pressure loading on buildings, and thus reveals an advantage of shaping a boom to elongate its rise time.",
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Diffraction of sonic booms around buildings resulting in the building spiking effect. / Cho, Sangik T.; Sparrow, Victor Ward.

In: Journal of the Acoustical Society of America, Vol. 129, No. 3, 01.03.2011, p. 1250-1260.

Research output: Contribution to journalArticle

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