A physics-based maintenance cost methodology for commercial aircraft engines

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dc.contributor.advisorLaskaridis, Panagiotis
dc.contributor.advisorSingh, Riti
dc.contributor.authorStitt, Alice C.
dc.date.accessioned2023-09-12T15:28:02Z
dc.date.available2023-09-12T15:28:02Z
dc.date.issued2014-08
dc.description.abstractA 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.description.coursenameEngDen_UK
dc.description.sponsorshipEngineering and Physical Sciences (EPSRC)en_UK
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/20199
dc.language.isoenen_UK
dc.publisherCranfield Universityen_UK
dc.publisher.departmentSOEen_UK
dc.subjectLiftingen_UK
dc.subjectjet engineen_UK
dc.subjectaero gas turbineen_UK
dc.subjectagingen_UK
dc.subjectcreepen_UK
dc.subjectfatigueen_UK
dc.subjectoxidationen_UK
dc.subjectthermo-mechanical fatigueen_UK
dc.subjectcosten_UK
dc.subjectmaintenanceen_UK
dc.subjectthrough lifeen_UK
dc.subjectshop visiten_UK
dc.subjectworkscopeen_UK
dc.subjectphysics-baseden_UK
dc.subjectvirtual workshopen_UK
dc.subjectlife limited parten_UK
dc.subjectrestorationen_UK
dc.subjectEGT marginen_UK
dc.titleA physics-based maintenance cost methodology for commercial aircraft enginesen_UK
dc.typeThesis or dissertationen_UK
dc.type.qualificationlevelDoctoralen_UK
dc.type.qualificationnamePhDen_UK

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