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Summary Report of Mission Acceleration Measurements for STS-78. Launched June 20, 1996The microgravity environment of the Space Shuttle Columbia was measured during the STS-78 mission using accelerometers from three different instruments: the Orbital Acceleration Research Experiment, the Space Acceleration Measurement System and the Microgravity Measurement Assembly. The quasi-steady environment was also calculated in near real-time during the mission by the Microgravity Analysis Workstation. The Orbital Acceleration Research Experiment provided investigators with real-time quasi-steady acceleration measurements. The Space Acceleration Measurement System recorded higher frequency data on-board for post-mission analysis. The Microgravity Measurement Assembly provided investigators with real-time quasi-steady and higher frequency acceleration measurements. The Microgravity Analysis Workstation provided calculation of the quasi-steady environment. This calculation was presented to the science teams in real-time during the mission. The microgravity environment related to several different Orbiter, crew and experiment operations is presented and interpreted in this report. A radiator deploy, the Flight Control System checkout, and a vernier reaction control system reboost demonstration had minimal effects on the acceleration environment, with excitation of frequencies in the 0.01 to 10 Hz range. Flash Evaporator System venting had no noticeable effect on the environment while supply and waste water dumps caused excursions of 2 x lO(exp -6) to 4 x 10(exp -6) g in the Y(sub b) and Z(sub b) directions. Crew sleep and ergometer exercise periods can be clearly seen in the acceleration data, as expected. Accelerations related to the two Life Science Laboratory Equipment Refrigerator/Freezers were apparent in the data as are accelerations caused by the Johnson Space Center Projects Centrifuge. As on previous microgravity missions, several signals are present in the acceleration data for which a source has not been identified. The causes of these accelerations are under investigation.
Document ID
19970010710
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Hakimzadeh, Roshanak (NASA Lewis Research Center Cleveland, OH United States)
Hrovat, Kenneth (Tal-Cut Co. North Olmstead, OH United States)
McPherson, Kevin M. (NASA Lewis Research Center Cleveland, OH United States)
Moskowitz, Milton E. (Tal-Cut Co. North Olmstead, OH United States)
Rogers, Melissa J. B. (Tal-Cut Co. North Olmstead, OH United States)
Date Acquired
September 6, 2013
Publication Date
January 1, 1997
Subject Category
Spacecraft Propulsion And Power
Report/Patent Number
E-10608
NASA-TM-107401
NAS 1.15:107401
Accession Number
97N15883
Funding Number(s)
PROJECT: RTOP 963-60-0D
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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