An Overview of the Gulfstream / NASA Quiet SpikeTM Flight Test Program

Cowart, Robbie; Grindle, Tom

doi:10.2514/6.2008-123

Cited by 14 publications

(5 citation statements)

References 7 publications

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“…At present, no aircraft exists that is capable of producing low-intensity shaped booms, so it is not possible to study human response to shaped booms using real overflights. Two experimental aircraft, the Shaped Sonic Boom Demonstrator 2 (SSBD) and the Gulfstream Quiet Spike™, 3 have successfully demonstrated boom shaping (SSBD after propagation to the ground 4 , Quiet Spike in the near field 5 ), but neither aircraft produced low intensity booms on the ground. Simulators, such as the NASA Langley Sonic Boom Simulator, can produce boom shapes not physically attainable by real aircraft, enabling studies of human response to different boom parameters and their interactions.…”

Section: Introductionmentioning

confidence: 98%

Realism assessment of sonic boom simulators

Sullivan¹,

Davies²,

Hodgdon³

et al. 2008

Noise Control Eng. J.

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Developments in small supersonic aircraft design are predicted to result in low-intensity sonic booms. Booms generated by current aircraft are similar to those that led to the ban on commercial supersonic flight over the US, so are unsuitable for parametric studies of psychoacoustic response to low-intensity booms. Therefore, simulators have been used to study the impact of predicted low-intensity sonic booms. However, simulators have been criticized because, when simulating conventional-level booms, the sounds were observed to be unrealistic by people experienced in listening to sonic booms. Thus, two studies were conducted to measure the perceived realism of three sonic boom simulators. Experienced listeners rated the realism of conventional sonic boom signatures when played in these simulators. The effects on perceived realism of factors such as duration of post-boom noise, exclusion of very low frequency components, inclusion of ground reflections, and type of simulator were examined. Duration of post-boom noise was found to have a strong effect on perceived realism, while type of simulator had a weak effect. It was determined that post-boom noise had to be at least 1.5 seconds long for the sound to be rated very realistic. Loudness level did not affect realism for the range of sounds played in the tests (80-93 dB ASEL).

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Section: Introductionmentioning

confidence: 98%

Realism assessment of sonic boom simulators

Sullivan¹,

Davies²,

Hodgdon³

et al. 2008

Noise Control Eng. J.

View full text Add to dashboard Cite

show abstract

“…The Shaped Sonic Boom Demonstration aircraft, which creates the trapezoid pressure wave, was designed by modifying the F-5E fighter aircraft [2,3]. Cowart and Grindle [4] and Howe et al [5] proposed and demonstrated another approach that they called Quiet Spike; they used a multistage nose to propagate several sets of a compression wave and expansion fan. Because the peak overpressure values (either positive or negative) in each sets are similar in level, their coalescences are delayed even in far fields.…”

mentioning

confidence: 99%

Staged Aft Body for Alleviation of Tail Boom

et al. 2014

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“…The emphasis in the present paper is upon a plug nozzle application for a potential supersonic civilian aircraft [10][11][12], which features an extended shroud section over the plug as shown in Fig. 1b.…”

mentioning

confidence: 99%

Experimental Testing and Numerical Simulations of Shrouded Plug-Nozzle Flowfields

Kapilavai¹,

Tapee²,

Sullivan³

et al. 2012

Journal of Propulsion and Power

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The static tests of an experimental, point-design, shrouded plug nozzle are the focus of current experimental and computational efforts. Unlike a conventional plug nozzle, the presence of a shroud results in converging-diverging nozzlelike behavior at off-design nozzle pressure ratios and a return to conventional plug nozzlelike behavior at design conditions. The static experimental tests brought to light unsteady characteristics related to shock/shock and shock/boundary-layer interactions at off-design and steady-operational characteristics at design conditions. Through a series of axisymmetric computations, the flow structure, unsteady characteristics, and static pressure distributions are analyzed in conjunction with the experiments. The computational results are in good agreement with experimental observations and are found to be a fast, efficient way of understanding the experimental data and, thereby, the nature of shrouded, plug-nozzle flowfields.

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An Overview of the Gulfstream / NASA Quiet SpikeTM Flight Test Program

Cited by 14 publications

References 7 publications

Realism assessment of sonic boom simulators

Realism assessment of sonic boom simulators

Staged Aft Body for Alleviation of Tail Boom

Experimental Testing and Numerical Simulations of Shrouded Plug-Nozzle Flowfields

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