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• W2317585890 abstract "Reduction of aircraft manufacturing cost benefits aircraft Direct Operating Cost. The degree of stringency in specifying aircraft surface smoothness requirements exhibits influence on the manufacturing cost i.e. the tighter the tolerance, the higher is the cost. In order to investigate the possibility of reducing aircraft manufacturing cost without unduly penalising parasite drag, a study has been conducted on an isolated turbofan nacelle to represent typical investigative areas associated with an entire aircraft. Eleven important manufacturing features, which contribute to the parasite drag of a generic turbofan nacelle components and subassemblies, are identified. The results offer considerable insight to a relatively complex problem in a multi-disciplinary environment. The influence of tolerance allocation at each of the features, seen as manufacturing 'defects' (excrescence effects e.g., contour deviation, mismatches, gaps and fastener flushness), is investigated to establish the relationship between aircraft parasite drag and cost involved at the assembly joints. Semi-empirical ESDU methods are used to estimate excrescence drag. The cost versus tolerance relationships are established through in-house methods using industrial data. Trade-off analysis involving manufacturing cost and aircraft drag indicates that, in general, there is scope for some tolerance relaxation from the current allocation to reduce aircraft Direct Operating Cost.____________ Copyright © 1998 by A. K. Kundu. Published by the American Institute of Aeronautics and Astronautics, Inc. with permission. MHB DOC CFD MTOW Subscript n p Nomenclature Drag coefficient (based on wing area) Minimum parasite drag Maximum half breadth of nacelle Direct Operating Cost Computational Fluid Dynamics Maximum take-off weight placed normal to flow placed parallel to flow" @default.
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• W2317585890 date "1998-08-22" @default.
• W2317585890 modified "2023-09-25" @default.
• W2317585890 title "A multi-disciplinary study of aircraft aerodynamic surface smoothness requirements to reduce operating cost" @default.
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• W2317585890 doi "https://doi.org/10.2514/6.1998-4874" @default.
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