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Title: Multidisciplinary design optimisation of morphing nonplanar wing systems
Author: Smith , David D.
Awarding Body: University of Bristol
Current Institution: University of Bristol
Date of Award: 2014
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Studies are undertaken using Multidisciplinary Design Optimisation (MDO) on the incorporation of an outboard morphing wing system, with two partitions that are variable in twist and dihedral angle, onto an existing conventionally designed commercial passenger jet. For this intent, an optimisation suite is created, incorporating a high end, low fidelity aero-structural control analysis together with a full engine model and integrated operational performance algorithm. Initial studies, focusing on the single objective of specific air range improvement for a number of flight phases, reveal increases of approximately 6.5-7.5% over the base line aircraft with wing fences across each case. Studies analyse the effects of the wing system on additional operational performance metrics, such as take-off, initial climb, approach-climb and landing performance parameters, in order to ascertain a truly holistic representation of the benefits of morphing wings. Further effort is expended to couple the effects of each phase within a multiobjective framework. Refined studies are performed, incorporating multiobjective optimisation methods and a critical phase, aero-structural wing sizing tool into the MDO suite. Results maintain strong improvements in cruise performance throughout the entire flight envelope and across multiple stage lengths. High fidelity computational and experimental analysis is performed upon a similarly modelled conventional aircraft wing. Results are generated with the intention of drawing meaningful comparisons with trends in aerodynamic and structural efficiency observed in the multidisciplinmy optimisation studies. Computational results are obtained with the DLR-Tau computational fluid dynamics code and experimental testing is performed in the University of Bristol 7' x 5' low speed wind tulmel. Outer twist variation of ±3 ° and dihedral angles from planar up to 90° are tested for a range of incidence angles. Results demonstrate varying levels of agreement between each form of analysis method and offer insight into the aerodynamic and structural trade-off required to select an optimal configuration. The work in this thesis numerically and experimentally outlines and provides justification for the feasible performance gains through the utilisation of morphing wing technology.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available