Integrated spacecraft environments model (ISEM)

Rantanen, Ray and Gordon, Timothy (1994) Integrated spacecraft environments model (ISEM). In: 4th International Conference on Engineering, Construction, and Operations in Space, 26 February - 3 March 1994, Albuquerque, NM, USA.

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Item Type:Conference or Workshop contribution (Paper)
Item Status:Live Archive


Capabilities of the ISEM code are presented that can aid in the understanding of the complex interactions between a space system and the ambient environment. The development of ISEM has been funded primarily by NASA over a period of 7 years. The code was developed as a flexible engineering tool to model the neutral molecular environment and it's interactions with the spacecraft based on orbital conditions and spacecraft molecular sources. Ionization of neutrals and charge exchange are added features. ISEM is a next generation of contamination models developed by the authors for Skylab (ODRAP), Outgassing Deposition Rate Assessment Program and Shuttle (SPACE), Shuttle Payload Contamination Evaluation. A predecessor to the ISEM code was called RAMDEN. Verification of the ISEM code has been made by comparing model results to experiment data both on orbit and in vacuum tests. Atmosphere Explorer-D was modeled and the results compared to flight data for the return flux of Neon to a mass spectrometer with very good results. Far field glow predictions by ISEM, from excited gas species, have been compared to the UV measurements made by the Imaging Spectrometric Observatory flown on Shuttle and the UV measurements made as a function of altitude on the S3-4 satellite with excellent results. ISEM was also compared to a series of vacuum environment tests at Arnold Engineering Development center with good success. Several matches with in flight mass spectrometer data of launched systems have been made. To date the physical systems for which ISEM codes exist include the Space Station Freedom, Shuttle, AE-D, EUVE, EMP, LDEF and many others. A description of the ISEM code, future plans and examples of it's predictions for the systems mentioned above are presented.

Additional Information:Conference Code:20191
Keywords:Environmental testing, Mass spectrometry, Mathematical models, Molecules, Orbits, Space flight, Space shuttles, Space stations, Vacuum, Integrated spacecraft environments model (ISEM), Neutral molecular environment, Spacecraft
Subjects:H Engineering > H100 General Engineering
H Engineering > H400 Aerospace Engineering
Divisions:College of Science > School of Engineering
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ID Code:11698
Deposited On:13 Feb 2014 09:09

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