Abstract
At GE Aircraft Engines (GEAE), during the preliminary design process for aircraft propulsion systems, the designer has always been concerned about the cost implications of engine architecture and material requirements, which are driven by design specified engine thermodynamic operating conditions. The concern was not only about initial acquisition economics, but about maintenance costs associated with the propulsion life cycle as well as the development costs associated with design and certification of the power plant. The difficulty has been that there was no rapid, accurate cost estimating process to allow the designers ready access to the cost implications of design choices. Examination of cost models, both inside and outside the company, failed to locate a generic model which satisfied GEAE business needs. The technical challenge had been established and GEAE launched an initiative in the early 1990s to produce such a code. This paper presents trade studies considering engine cycle trades with cost as a key discriminator.
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