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http://dx.doi.org/10.5139/JKSAS.2015.43.4.334

The Effect of Overdesign on Titan Rocket Engine Reliability and Development Cost  

Kim, Kyungmee O. (Department of Industrial Engineering, Konkuk University)
Hwang, Junwoo (Department of Industrial Engineering, Konkuk University)
Publication Information
Journal of the Korean Society for Aeronautical & Space Sciences / v.43, no.4, 2015 , pp. 334-340 More about this Journal
Abstract
Engine derating is often considered for reliability benefits because lower power operation reduces its failure probability. To be derated during operation, however, the engine must be initially overdesigned. The engine overdesign is cost effective only if reliability increased from derating is enough to offset the initial increase in the development cost caused from the overdesign. The purpose of this paper is to provide an analytical model to consider a trade-off between the engine overdesign and derating. We use a logistic regression model to explain reliability growth in the number of hot firing tests for a fixed power level. Using the Transcost model with the reliability growth model, we show that 10% overdesign of Titan rocket engine decreases its development cost by about 9% and 23% depending on the reliability requirement. We also point out that such a cost reduction depends on the fuel type a rocket uses.
Keywords
Titan Rocket Engine; Engine Development Cost; Transcost Model; Logistic Regression Model;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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1 Hammond, W.E. Space Transportation : A Systems Approach to Analysis and Design, AIAA Education Series, Washington D.C., 1999.
2 Huang, Z., Fint, J.A., and Kuck, F.M., Key Reliability Drivers of Liquid Propulsion Engines and a Reliability Model for Sensitivity Analysis, In: The Boeing Company, Rocketdyne Propulsion & Power, 41st AIAA Joint Propulsion Conference & Exhibit, Vol. 10, 2005.
3 Seo, Y-K, and Oh, B-S, KSLV-II Cost Estimate using TRANSCOST 7.1, Aerospace Engineering and Technology, Vol. 6, No.2, 2007, pp.119-125.
4 Yoo, I-S, Seo, Y-K, Lee, J-H, and Oh, B-S, Application of Cost Estimation to Space Launch Vehicle Development Program, Journal of the Society of Korea Industrial and Systems Engineering, Vol.30, No.3, 2007, pp.165-173.
5 Koelle, D.E., Handbook of Cost Engineering for Space Transportation Systems with TRANSCOST 8.0, 2010, TransCostSystem.
6 Adams, J.D., Hickman, R.A., and Mayberry J.P., Payload Interface Standardization, 46th International Astronatuical Congress, October 2-6, Oslo, Norway, 1995.
7 Kececioglu, D. Reliability Engineering Handbook, Volume 2, 1991.
8 NASA, Exploration Systems Architecture Study, Final Report, Appendix 6D, 2005 November, pp. 194-195.
9 Kim, K.O. and Hwang, J.W., A Methodology for Estimating Reliability and Development Cost of a New Liquid Rocket Engine-focused on Staged Combustion Cycle with LOX/LH2, Journal of the Korean Society for Aeronautical & Space Sciences, Vol. 42, No. 2, 2014, pp. 437-443.   DOI