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53
1 Design and Optimisation of Composite Corrugated Skin for a Span Morphing Wing
"... The concept of span morphing aircraft is attracting a lot of attention due to the demands to enhance flight performance and control authority. Corrugated laminates provide a good solution for the skin of a span morphing wing due to their extremely anisotropic behaviour. Although corrugated skins hav ..."
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to the aerodynamics. Two aerodyanic solvers, Tornado Vortex Lattice Method (VLM) and XFOIL, are compared and a Genetic Algorithm (GA) is used as the optimizer. Parametric modeling and calculation by ANSYS APDL was used to generate the finite element model and perform the analysis automatically based on the global
Aerodynamic and Structural Optimisation of Powerplant Integration under the Wing of a Transonic Transport Aircraft
"... Multi-disciplinary optimisation (MDO) of the outboard engine pylon of a large transonic transport aircraft is reported in this paper. The disciplines involved were structure and aerodynamics, although this paper focuses on the aerodynamic aspect. A two-level strategy was followed to solve this probl ..."
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discipline-specific design methods. This is illustrated in this work by the use of RANS discrete adjoint equations to compute the gradient of the objective function during aerodynamic shape optimisations. Validation work on this state-of-the-art numerical method was carried out and is also presented.
likelihood and the role of models in molecular phylogenetics.
- Mol. Biol. Evol.
, 2000
"... Methods such as maximum parsimony (MP) are frequently criticized as being statistically unsound and not being based on any ''model.'' On the other hand, advocates of MP claim that maximum likelihood (ML) has some fundamental problems. Here, we explore the connection between the ..."
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Cited by 70 (11 self)
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is the leading alternative, other approaches include distance-based methods that use transformed or inferred distances, for example, logdet/paralinear distances (see Nevertheless, ML methodology enjoys far from universal acceptance. Objections to ML include the following: Concern about the validity and exact
AIRCRAFT ENGINE NOISE SCATTERING- A DISCONTINUOUS SPECTRAL ELEMENT APPROACH
"... The paper presents a time-domain method for computation of sound radiation from aircraft engine sources to the far-field. The effects of nonuniform flow around the aircraft and scattering of sound by fuselage and wings are accounted for in the formulation. Our approach is based on the discretization ..."
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Cited by 1 (0 self)
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on the discretization of the inviscid flow equations through a collocation form of the Discontinuous Galerkin spectral element method. An isoparametric representation of the underlying geometry is used in order to take full advantage of the spectral accuracy of the method. Largescale computations are made possible by a
1 Aeroelastic Tailoring Using Ant Colony Optimization
"... An Ant Colony Optimisation approach is used to maximize the flutter / divergence speed of a simple rectangular composite wing through determination of the best combination of ply orientations. It is shown how the method can be applied to discrete optimization problems such as aeroelastic tailoring. ..."
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An Ant Colony Optimisation approach is used to maximize the flutter / divergence speed of a simple rectangular composite wing through determination of the best combination of ply orientations. It is shown how the method can be applied to discrete optimization problems such as aeroelastic tailoring
TU-Darmstadt Fachbereich Informatik QPE- A GRAPHICAL EDITOR FOR MODELING USING QUEUEING PETRI NETS
"... Betreuer: ..."
Life cycle costing—theory, information acquisition and application.
- International Journal of Project Management,
, 1997
"... Especially in the last two decades of an increasingly-competitive business environment, dwindling resources and an ever-increasing need to obtain value for money in all areas of corporate activity, it has become essential that all available resources be used optimally (Griffith, J. W. and Keely, B. ..."
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Cited by 18 (0 self)
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its acquisition is first considered, and ends when it is finally taken out of service for disposal or redeployment (when a new LCC begins). LCC seeks to optimise the cost of acquiring, owning and operating physical assets over their useful lives by attempting to identify and quantify all
APractical Lattice-based Digital Signature Schemes
"... Digital signatures are an important primitive for building secure systems and are used in most real world security protocols. However, almost all popular signature schemes are either based on the factoring as-sumption (RSA) or the hardness of the discrete logarithm problem (DSA/ECDSA). In the case o ..."
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Digital signatures are an important primitive for building secure systems and are used in most real world security protocols. However, almost all popular signature schemes are either based on the factoring as-sumption (RSA) or the hardness of the discrete logarithm problem (DSA/ECDSA). In the case
ative Commons Attribution Non-Commercial No Derivatives licence. Researchers
"... I herewith certify that all material in this dissertation which is not my own work has been properly acknowledged. ..."
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I herewith certify that all material in this dissertation which is not my own work has been properly acknowledged.
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