A physics-based maintenance cost methodology for commercial aircraft engines.

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dc.contributor.advisor Laskaridis, Panagiotis
dc.contributor.advisor Singh, R.
dc.contributor.author Stitt, Alice C.
dc.date.accessioned 2018-04-06T11:25:42Z
dc.date.available 2018-04-06T11:25:42Z
dc.date.issued 2014-08
dc.identifier.uri http://dspace.lib.cranfield.ac.uk/handle/1826/13134
dc.description.abstract A need has been established in industry and academic publications to link an engine’s maintenance costs throughout its operational life to its design as well as its operations and operating conditions. The established correlations between engine operation, design and maintenance costs highlight the value of establishing a satisfactory measure of the relative damage due to different operating conditions (operational severity). The methodology developed in this research enables the exploration of the causal, physics-based relationships underlying the statistical correlations in the public domain and identifies areas for further investigation. This thesis describes a physics-based approach to exploring the interactions, for commercial aircraft, of engine design, operation and through life maintenance costs. Applying the “virtual-workshop” workscoping concept to model engine maintenance throughout the operating life captures the maintenance requirements at each shop visit and the impact of a given shop visit on the timing and requirements for subsequent visits. Comparisons can thus be made between the cost implications of alternative operating regimes, flight profiles and maintenance strategies, taking into account engine design, age, operation and severity. The workscoping model developed operates within a physics-based methodology developed collaboratively within the research group which encompasses engine performance, lifing and operational severity modelling. The tool-set of coupled models used in this research additionally includes the workscoping maintenance cost model developed and implements a simplified 3D turbine blade geometry, new lifing models and an additional lifing mechanism (Thermo-mechanical fatigue (TMF)). Case studies presented model the effects of different outside air temperatures, reduced thrust operations (derate), flight durations and maintenance decisions. The use of operational severity and exhaust gas temperature margin deterioration as physics based cost drivers, while commonly accepted, limit the comparability of the results to other engine-aircraft pairs as the definition of operational severity, its derivation and application vary widely. The use of a single operation severity per mission based on high pressure turbine blade life does not permit the maintenance to vary with the prevalent lifing mechanism type (cyclic / steady state). en_UK
dc.language.iso en en_UK
dc.rights © Cranfield University, 2015. All rights reserved. No part of this publication may be reproduced without the written permission of the copyright holder.
dc.rights CC0 1.0 Universal *
dc.rights.uri http://creativecommons.org/publicdomain/zero/1.0/ *
dc.subject Severity en_UK
dc.subject Lifting en_UK
dc.subject Jet engine en_UK
dc.subject Aero gas turbine en_UK
dc.subject Aging en_UK
dc.subject Creep en_UK
dc.subject Fatigue en_UK
dc.subject Oxidation en_UK
dc.subject Thermo-mechanical fatigue en_UK
dc.subject Cost en_UK
dc.subject Maintenance en_UK
dc.subject Through life en_UK
dc.subject Shop visit en_UK
dc.subject Workscope en_UK
dc.subject Physics-based en_UK
dc.subject Virtual workshop en_UK
dc.subject Life limited part en_UK
dc.subject Restoration en_UK
dc.subject EGT margin en_UK
dc.title A physics-based maintenance cost methodology for commercial aircraft engines. en_UK
dc.type Thesis en_UK


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© Cranfield University, 2015. All rights reserved. No part of this publication may be reproduced without the written permission of the copyright holder. Except where otherwise noted, this item's license is described as © Cranfield University, 2015. All rights reserved. No part of this publication may be reproduced without the written permission of the copyright holder.

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