NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Summary of Propagation Cases of the Second AIAA Sonic Boom Prediction WorkshopA summary is provided for the propagation portion of the second AIAA Sonic Boom Workshop held January 8, 2017 in conjunction with the AIAA SciTech 2017 conference. Near-field pressure waveforms for two cases were supplied and ground signatures at multiple azimuthal angles as well as their corresponding loudness metrics were requested from 10 participants, representing 3 countries. Each case had some required runs, as well as some optional runs. The required cases included atmospheric profiles with measured data including winds, using Radiosonde balloon data at multiple geographically spread locations, while the optional cases included temperature and pressure profiles from the US Standard atmosphere. The humidity profiles provided for the optional cases were taken from ANSI guidance, as the authors were unaware of an accepted standard at the time the cases were released to the participants. Participants provided ground signatures along with the requested data, including some loudness metrics using their best practices, which included lossy as well as lossless schemes. All the participants' submissions, for each case, are compared and discussed. Noise or loudness measures are calculated and detailed comparisons and statistical analyses are performed and presented. It has been observed that the variation in the loudness measures and spread between participants' submissions increased as the computation proceeded from under-track locations towards the lateral cut-off. Lessons learned during this workshop are discussed and recommendations are made for potential improvements and possible subsequent workshops as we collectively attempt to refine our analysis methods.
Document ID
20170006490
Document Type
Conference Paper
Authors
Rallabhandi, Sriram (NASA Langley Research Center Hampton, VA, United States)
Loubeau, Alexandra (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
July 11, 2017
Publication Date
June 5, 2017
Subject Category
Aeronautics (General)
Acoustics
Report/Patent Number
NF1676L-27029
Meeting Information
AIAA Aviation 2017 Conference(Denver, CO)
Funding Number(s)
WBS: WBS 110076.02.07.03.15
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

Available Downloads

NameType 20170006490.pdf STI

Related Records

IDRelationTitle20200002501See AlsoSummary of Propagation Cases of the Second AIAA Sonic Boom Prediction Workshop