International Journal of Advances in Science, Engineering and Technology(IJASEAT)
.
Follow Us On :
current issues
Volume-10,Issue-1  ( Jan, 2022 )
Statistics report
Jun
Submitted Papers : 80
Accepted Papers : 10
Rejected Papers : 70
Acc. Perc : 12%
  Journal Paper


Paper Title :
Cost- Benefit Analysis Of Two Dissimilar Warm Standby Space Shuttle System Subject To Failure Due To Damage Of The Thermal Protection System Of The Shuttle’s Wing And Failure Due To Atmospheric Hot Gas With Switch Failure

Author :Ashok Kumar Saini

Article Citation :Ashok Kumar Saini , (2015 ) " Cost- Benefit Analysis Of Two Dissimilar Warm Standby Space Shuttle System Subject To Failure Due To Damage Of The Thermal Protection System Of The Shuttle’s Wing And Failure Due To Atmospheric Hot Gas With Switch Failure " , International Journal of Advances in Science, Engineering and Technology(IJASEAT) , pp. 15-19, Volume-3, Issue-1

Abstract : The Space Shuttle Columbia disaster occurred on February 1, 2003, when Columbia disintegrated over Texas and Louisiana as it reentered Earth's atmosphere, killing all seven crew members. During the launch of STS-107, Columbia's 28th mission, a piece of foam insulation broke off from the Space Shuttle external tank and struck the left wing. Most previous shuttle launches had seen minor damage from foam shedding, but some engineers suspected that the damage to Columbia was more serious. NASA managers limited the investigation, reasoning that the crew could not have fixed the problem if it had been confirmed. When the Shuttle reentered the atmosphere of Earth, the damage allowed hot atmospheric gases to penetrate and destroy the internal wing structure, which caused the spacecraft to become unstable and slowly break apart. After the disaster, Space Shuttle flight operations were suspended for more than two years, similar to the aftermath of the Challenger disaster. Construction of the International Space Station (ISS) was put on hold; the station relied entirely on the Russian Federal Space Agency for resupply for 29 months until Shuttle flights resumed with STS-114 and 41 months for crew rotation until STS-121.Several technical and organizational changes were made, including adding a thorough on-orbit inspection to determine how well the shuttle's thermal protection system had endured the ascent, and keeping a designated rescue mission ready in case irreparable damage was found. Except for one final mission to repair the Hubble Space Telescope, subsequent missions were flown only to the ISS so that the crew could use it as a "safe haven". Two-unit standby system subject to environmental conditions such as shocks, change of weather conditions etc. have been discussed in reliability literature by several authors due to significant importance in defenses , industry etc. In the present paper we have taken two-non-identical warm standby system with failure time distribution as exponential and repair time distribution as general. We are considering system subject to failure due to (i) damaged thermal protection and (ii) atmospheric hot gas requiring different types of repair facilities. Using semi Markov regenerative point technique we have calculated different reliability characteristics such as MTSF, reliability of the system, availability analysis in steady state, busy period analysis of the system under repair, expected number of visits by the repairman in the long run and gain-function and graphs are drawn. Keyword- Warm Standby, Failure Due To Damaged Thermal Protection, Failure Due To Atmospheric Hot Gas, Switches Failure.

Type : Research paper

Published : Volume-3, Issue-1


DOIONLINE NO - IJASEAT-IRAJ-DOIONLINE-1623   View Here

Copyright: © Institute of Research and Journals

| PDF |
Viewed - 63
| Published on 2015-01-07
   
   
IRAJ Other Journals
IJASEAT updates
Volume-9,Issue-2(April, 2020)
The Conference World

JOURNAL SUPPORTED BY