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Experiment Design and Visualization Techniques for an X-59 Low-boom Variability StudyThis presentation outlines the design of experiments approach and data visualization techniques for a simulation study of sonic booms from NASA’s X-59 supersonic aircraft. The X-59 will soon be flown over communities across the contiguous USA as it produces a low-loudness sonic boom, or low-boom. Survey data on human perception of low-booms will be collected to support development of potential future commercial supersonic aircraft noise regulatory standards.
The macroscopic atmosphere plays a critical role in the loudness of sonic booms. The extensive sonic boom simulation study presented herein was completed to assess climatological, geographical, and seasonal effects on the variability of the X-59’s low-boom loudness and noise exposure region size in order to inform X-59 community test planning. The loudness and extent of the noise exposure region make up the “sonic boom carpet.” Two spatial and temporal resolutions of atmospheric input data to the simulation were investigated. A Fast Flexible Space-Filling Design was used to select the locations across the USA for the two spatial resolutions. Analysis of simulated X-59 low-boom loudness data within a regional subset of the northeast USA was completed using a bootstrap forest to determine the final spatial and temporal resolution of the countrywide simulation study. Atmospheric profiles from NOAA’s Climate Forecast System Version 2 database were used to generate over one million simulated X-59 carpets at the final selected 138 locations across the USA.
Effects of aircraft heading, season, geography, and climate zone on low-boom levels and noise exposure region size were analyzed. Models were developed to estimate loudness metrics throughout the USA for X-59 supersonic cruise overflight, and results were visualized on maps to show geographical and seasonal trends. These results inform regulators and mission planners on expected variations in boom levels and carpet extent from atmospheric variations. Understanding potential carpet variability is important when planning community noise surveys using the X-59.
Document ID
20220005701
Acquisition Source
Langley Research Center
Document Type
Presentation
Authors
Will Doebler
(Langley Research Center Hampton, Virginia, United States)
Sara Wilson
(Langley Research Center Hampton, Virginia, United States)
Alexandra Loubeau
(Langley Research Center Hampton, Virginia, United States)
Date Acquired
April 13, 2022
Subject Category
Acoustics
Meeting Information
Meeting: DATAWorks 2022
Location: Alexandria, VA
Country: US
Start Date: April 26, 2022
End Date: April 28, 2022
Sponsors: Institute For Defense Analyses
Funding Number(s)
WBS: 110076.02.07.06.13
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Technical Review
NASA Peer Committee
Keywords
X-59
loudness
PL
dataworks
visualization techniques
design of experiments
PCBoom
sonic boom
low-boom
sonic thump
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