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Comparisons Between Pretest Prediction and Flight Test Data of Aerodynamic Loading for EFT-1Exploration Flight Test One (EFT-1) was an incredible milestone in the development NASA's Orion spacecraft. It incorporated hundreds of articles of flight test instrumentation and returned with a wealth of data. Aerodynamic surface pressures were collected during launch vehicle ascent and capsule reentry and descent. These discrete surface pressure measurements enable comparisons to computational results and ground test data. This paper details the comparisons between pre-test predictions and flight test data for the Orion MPCV Crew Module (CM) and Launch Abort Tower (LAT) during all phases of flight. Regions with strong comparisons, poor predictions, and lessons learned are discussed. 38 pressure measurements were made on the LAT during ascent. Nine of the gauges were Honeywell PPTs and the remainder were Kulite pressure transducers. In order to address bias in the Kulites, a two-point linear calibration was used and the details are discussed. Results from the flight are compared to existing database products. 44 pressure measurements were made on the CM during reentry and descent. Nine of the gauges were Honeywell PPTs and the remainder were Kulite pressure transducers. In order to address bias in the Kulites, a tare was made against the vacuum measurements as described below. Once the bias was removed from the gauges, comparisons between predicted loading and the measured results are compared.
Document ID
20150020944
Acquisition Source
Johnson Space Center
Document Type
Conference Paper
Authors
Schwing, Alan M. (NASA Johnson Space Center Houston, TX, United States)
Date Acquired
November 6, 2015
Publication Date
June 13, 2016
Subject Category
Space Transportation And Safety
Spacecraft Design, Testing And Performance
Launch Vehicles And Launch Operations
Report/Patent Number
JSC-CN-34632
Meeting Information
Meeting: AIAA Aviation and Aeronautics Forum and Exposition (AIAA AVIATION 2016)
Location: Washington, DC
Country: United States
Start Date: June 13, 2016
End Date: June 17, 2016
Sponsors: American Inst. of Aeronautics and Astronautics
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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