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Record Details

Record 43 of 19707
Software for Estimating Costs of Testing Rocket Engines
Author and Affiliation:
Hines, Merion M.(Lockheed Martin Space Operations, Bay Saint Louis, MS, United States)
Abstract: A 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.
Publication Date: May 10, 2002
Document ID:
20040016089
(Acquired Feb 25, 2004)
Subject Category: COMPUTER PROGRAMMING AND SOFTWARE
Report/Patent Number: NASA/NP-2002-06-00024-SSC
Document Type: NASA Tech Brief
Financial Sponsor: NASA Stennis Space Center; Stennis Space Center, MS, United States
Organization Source: Lockheed Martin Space Operations; Bay Saint Louis, MS, United States
Description: 2p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: No Copyright
NASA Terms: COST ESTIMATES; MATHEMATICAL MODELS; ROCKET ENGINES; PARAMETERIZATION; COMPUTER PROGRAMS; POLYNOMIALS; ENGINE TESTS; THRUST; FAILURE MODES
Availability Source: National Technology Transfer Center (NTTC), Wheeling, WV
Availability Notes: Abstract Only
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