NDLI: Life-cycle cost analysis of projects using a polynomial cash flow model for nonuniform maintenance and operations costs

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Life-cycle cost analysis of projects using a polynomial cash flow model for nonuniform maintenance and operations costs

Content Provider	NASA Technical Reports Server (NTRS)
Author	Lorden, G. Remer, D. S.
Organization	The National Aeronautics and Space Administration (NASA)
Copyright Year	1981
Abstract	A mathematical model is developed for calculating the life-cycle costs for a project where the maintenance and operations (M&O) costs change in a nonlinear manner with time. Closed-form solutions are presented for computing the present worth of projects with periodic cash flow profiles that can be approximated by polynomial functions. The results show that the life-cycle cost for a project can be grossly underestimated (or overestimated) if the M&O costs increase or decrease nonuniformly over time rather than being constant or linear as is often assumed in project economic evaluations. The following range of variables is examined: (1) project life from 2 to 15 years, (2) interest rate from 0 to 30 percent per year, and (3) polynomials of order 0 to 5. Simplified solutions or the present worth are presented for two limiting cases: extented project lifetime and negligible interest rate. Also a simplified expression is provided for accurate present worth M&O estimates for DSN projects. In addition, a sensitivity analysis of the model based on graphical results and a numerical example plus tables and graphs are given to help the reader calculate M&O life-cycle costs over a wide range of variables.
File Size	830576
File Format	PDF
Alternate Webpage(s)	http://www.archive.org/details/nasa_techdoc_19820008250
Archival Resource Key	ark:/13960/t51g1dz3n
Language	English
Publisher Date	1981-12-15
Access Restriction	Open
Subject Keyword	Learning Sentences Technical Writing Communicating Editing Training Analysis Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text

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