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Title: Accelerated mission simulation test for AXAF-I

Abstract

The mission profile for the Advanced X-ray Astrophysics Facility -- Imaging (AXAF-I) vehicle is characterized by long solstice seasons and short eclipse seasons. This type of cycle profile is ideal for accelerating real-time testing by shortening the solstice seasons while maintaining real-time cycling during eclipse seasons. Because of the benign operation of the nickel-hydrogen (Ni-H{sub 2}) cells during the solstice seasons, this acceleration can be done without significantly decreasing the validity of the test results. For AXAF-I, this acceleration technique allows an analysis of ``end-of-mission`` data after only 1 year of testing. The accelerated testing profile is used here on a five-cell pack of AXAF-I flight-design 30 ampere-hour (Ah) Ni-H{sub 2} cells. It will be used to verify that the proposed design is capable of meeting mission life requirements. Since these cells were built, the capacity planned for the flight cell has been increased to 40 Ah. The design, however, remains identical to that of this 30 Ah cell. The test began in March 1994 and will be completed in the early summer of 1995. Preliminary results from this test indicate acceptable performance of the cells during the first half of the mission simulation. Acceptance test data at TRW andmore » at the Marshall Space Flight Center (MSFC) show extremely tight voltage and capacity performance -- both well above minimum specification values. This tightly-grouped voltage performance has been maintained during the mission simulation portion of the test. Estimated capacities (based on pressure) also continue to be well above minimum requirements, although verification of these estimates through a capacity test is not planned until the mission simulation is completed.« less

Authors:
;  [1]; ;  [2]
  1. NASA, Huntsville, AL (United States). Marshall Space Flight Center
  2. TRW, Redondo Beach, CA (United States)
Publication Date:
OSTI Identifier:
186999
Report Number(s):
CONF-950729-
TRN: IM9609%%291
Resource Type:
Book
Resource Relation:
Conference: 30. intersociety energy conversion engineering conference, Orlando, FL (United States), 30 Jul - 5 Aug 1995; Other Information: PBD: 1995; Related Information: Is Part Of Proceedings of the 30. intersociety energy conversion engineering conference. Volume 1: Aerospace power; Goswami, D.Y. [ed.] [Univ. of Florida, Gainesville, FL (United States)]; Kannberg, L.D.; Somasundaram, S. [eds.] [Pacific Northwest Lab., Richland, WA (United States)]; Mancini, T.R. [ed.] [Sandia National Labs., Albuquerque, NM (United States)]; PB: 798 p.
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; SPACECRAFT POWER SUPPLIES; NICKEL-HYDROGEN BATTERIES; PERFORMANCE TESTING; SPECIFICATIONS; ELECTRIC POTENTIAL; EXPERIMENTAL DATA

Citation Formats

Brewer, J C, Jackson, L G, Lurie, C, and Foroozan, S. Accelerated mission simulation test for AXAF-I. United States: N. p., 1995. Web.
Brewer, J C, Jackson, L G, Lurie, C, & Foroozan, S. Accelerated mission simulation test for AXAF-I. United States.
Brewer, J C, Jackson, L G, Lurie, C, and Foroozan, S. 1995. "Accelerated mission simulation test for AXAF-I". United States.
@article{osti_186999,
title = {Accelerated mission simulation test for AXAF-I},
author = {Brewer, J C and Jackson, L G and Lurie, C and Foroozan, S},
abstractNote = {The mission profile for the Advanced X-ray Astrophysics Facility -- Imaging (AXAF-I) vehicle is characterized by long solstice seasons and short eclipse seasons. This type of cycle profile is ideal for accelerating real-time testing by shortening the solstice seasons while maintaining real-time cycling during eclipse seasons. Because of the benign operation of the nickel-hydrogen (Ni-H{sub 2}) cells during the solstice seasons, this acceleration can be done without significantly decreasing the validity of the test results. For AXAF-I, this acceleration technique allows an analysis of ``end-of-mission`` data after only 1 year of testing. The accelerated testing profile is used here on a five-cell pack of AXAF-I flight-design 30 ampere-hour (Ah) Ni-H{sub 2} cells. It will be used to verify that the proposed design is capable of meeting mission life requirements. Since these cells were built, the capacity planned for the flight cell has been increased to 40 Ah. The design, however, remains identical to that of this 30 Ah cell. The test began in March 1994 and will be completed in the early summer of 1995. Preliminary results from this test indicate acceptable performance of the cells during the first half of the mission simulation. Acceptance test data at TRW and at the Marshall Space Flight Center (MSFC) show extremely tight voltage and capacity performance -- both well above minimum specification values. This tightly-grouped voltage performance has been maintained during the mission simulation portion of the test. Estimated capacities (based on pressure) also continue to be well above minimum requirements, although verification of these estimates through a capacity test is not planned until the mission simulation is completed.},
doi = {},
url = {https://www.osti.gov/biblio/186999}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Dec 31 00:00:00 EST 1995},
month = {Sun Dec 31 00:00:00 EST 1995}
}

Book:
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