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Software for Estimating Costs of Testing Rocket EnginesA high-level parametric mathematical model for estimating the costs of testing rocket engines and components at Stennis Space Center has been implemented as a Microsoft Excel program that generates multiple spreadsheets. The model and the program are both denoted, simply, the Cost Estimating Model (CEM). The inputs to the CEM are the parameters that describe particular tests, including test types (component or engine test), numbers and duration of tests, thrust levels, and other parameters. The CEM estimates anticipated total project costs for a specific test. Estimates are broken down into testing categories based on a work-breakdown structure and a cost-element structure. A notable historical assumption incorporated into the CEM is that total labor times depend mainly on thrust levels. As a result of a recent modification of the CEM to increase the accuracy of predicted labor times, the dependence of labor time on thrust level is now embodied in third- and fourth-order polynomials.
Document ID
20040016089
Acquisition Source
Stennis Space Center
Document Type
Other - NASA Tech Brief
Authors
Hines, Merion M.
(Lockheed Martin Space Operations Bay Saint Louis, MS, United States)
Date Acquired
August 21, 2013
Publication Date
May 10, 2002
Subject Category
Computer Programming And Software
Report/Patent Number
NASA/NP-2002-06-00024-SSC
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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