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Summary Report of Mission Acceleration Measurements for STS-73, Launched October 20, 1995The microgravity environment of the Space Shuttle Columbia was measured during the STS-73 mission using accelerometers from five different instruments: the Orbital Acceleration Research Experiment, the Space Acceleration Measurement System, the Three-dimensional Microgravity Accelerometer, the Microgravity Measuring Device, and Suppression of Transient Accelerations by Levitation Evaluation System. The Microgravity Analysis Workstation quasi-steady environment calculation and comparison of this calculation with Orbital Acceleration Research Experiment data was used to assess how appropriate a planned attitude was expected to be for one Crystal Growth Facility experiment sample. The microgravity environment related to several different Orbiter, crew, and experiment operations is presented and interpreted in this report. Data are examined to show the effects of vernier reaction control system jet firings for Orbiter attitude control. This is compared to examples of data when no thrusters were firing, when the primary reaction control system jets were used for attitude control, and when single vernier jets were fired for test purposes. In general, vernier jets, when used for attitude control, cause accelerations in the 3 x 10(exp -4) g to 7 x 10(exp -4) g range. Primary jets used in this manner cause accelerations in the 0.01 to 0.025 g range. Other significant disturbance sources characterized are water dump operations, with Y(sub b) axis acceleration deviations of about 1 x 10(exp -6) g; payload bay door opening motion, with Y(sub o) and Z(sub o) axis accelerations of frequency 0.4 Hz; and probable Glovebox fan operations with notable frequency components at 20, 38, 43, 48, and 53 Hz. The STS-73 microgravity environment is comparable to the environments measured on earlier microgravity science missions.
Document ID
19960048086
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Rogers, Melissa J. B. (Tal-Cut Co. Beachwood, OH United States)
DeLombard, Richard (NASA Lewis Research Center Cleveland,OH United States)
Date Acquired
September 6, 2013
Publication Date
July 1, 1996
Subject Category
Instrumentation And Photography
Report/Patent Number
NAS 1.15:107269
E-10336
NASA-TM-107269
Accession Number
96N33585
Funding Number(s)
PROJECT: RTOP 963-60-0D
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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