Formulation of Available Energy-Based Methods to Assess System Affordability
Roth, Bryce Alexander
Mavris, Dimitri N.
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This paper describes the fundamental motivation and ideas surrounding current developments in available energy-based methods for vehicle design, which are a class of methods allowing direct estimation of the total cost chargeable to each loss mechanism in any general vehicle design (land, sea, air, or space). It is shown that losses can be expressed in terms of chargeable fuel weight. These are in turn expressed in terms of cost breakdowns. The method is demonstrated for a notional Boeing 737/CFM56 example for which fuel chargeability is determined based on the various loss mechanisms inherent to the engine/airframe. This technique is then used to derive a detailed breakdown of direct operating cost, and the potential of this technique for evaluation of the impact due to environmental technologies, including uncertainties, is discussed.