Log in

Relevant bibliographies by topics / Numerical optimisation / Dissertations / Theses

To see the other types of publications on this topic, follow the link: Numerical optimisation.

Dissertations / Theses on the topic 'Numerical optimisation'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 dissertations / theses for your research on the topic 'Numerical optimisation.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.

1

Routley, Paul Richard. "BiCMOS circuit optimisation." Thesis, University of Southampton, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.242271.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Penev, Kalin. "Adaptive search heuristics applied to numerical optimisation." Thesis, Southampton Solent University, 2004. http://ssudl.solent.ac.uk/598/.

Full text

Abstract:

The objective of the research project involves investigation of evolutionary computational methods, in particular analysis of population-based search heuristics, and abstraction of core cognition, which may lead to the design of a novel adaptive search algorithm capable of high performance and reliability. The thesis proposes a novel adaptive heuristic method called Free Search (FS). Free Search can be classified as a population-based evolutionary computational method. It gradually changes a set of solutions until satisfaction of certain criteria. The algorithm operates with real-value numbers

APA, Harvard, Vancouver, ISO, and other styles

3

Tian, Na. "Novel optimisation methods for numerical inverse problems." Thesis, University of Greenwich, 2011. http://gala.gre.ac.uk/9099/.

Full text

Abstract:

Inverse problems involve the determination of one or more unknown quantities usually appearing in the mathematical formulation of a physical problem. These unknown quantities may be boundary heat flux, various source terms, thermal and material properties, boundary shape and size. Solving inverse problems requires additional information through in-situ data measurements of the field variables of the physical problems. These problems are also ill-posed because the solution itself is sensitive to random errors in the measured input data. Regularisation techniques are usually used in order to dea

APA, Harvard, Vancouver, ISO, and other styles

4

Yang, Yong. "Efficient parallel genetic algorithms applied to numerical optimisation." Thesis, Southampton Solent University, 2008. http://ssudl.solent.ac.uk/631/.

Full text

Abstract:

This research is concerned with the optimisation of multi-modal numerical problems using genetic algorithms (GAs). GAs use randomised operators operating over a population of candidate solutions to generate new points in the search space. As the scale and complexity of target applications increase, run time becomes a major inhibitor. Parallel genetic algorithms (PGAs) have therefore become an important area of research. Coarse-grained implementations are one of the most popular models and many researchers are concerned primarily with this area. The island model was the only one class of parall

APA, Harvard, Vancouver, ISO, and other styles

5

Joubert, N. J. D. "Numerical design optimisation for the Karoo Array Telescope." Thesis, Stellenbosch : University of Stellenbosch, 2009. http://hdl.handle.net/10019.1/2727.

Full text

Abstract:

Thesis (MScEng (Mechanical and Mechatronic Engineering))--University of Stellenbosch, 2009.<br>Although mass minimisation is an important application within structural optimisation, other applications include: (1) concept generation, (2) concept evaluation, (3) design for structural feasibility and (4) data matching. These applications, except data matching, are discussed and illustrated on a prototype design of the Karoo Array Telescope (KAT) antenna. The KAT passed through the design process and a full scale prototype was built, but was found to be too expensive. A detailed finite elem

APA, Harvard, Vancouver, ISO, and other styles

6

Alqahtani, Mohammed Aeyed M. "Numerical Algorithms for Polynomial Optimisation Problems with Applications." Thesis, Curtin University, 2019. http://hdl.handle.net/20.500.11937/73582.

Full text

Abstract:

In this thesis, we study tensor eigenvalue problems and polynomial optimization problems. In particular, we present a fast algorithm for computing the spectral radii of symmetric nonnegative tensors without requiring the partition of the tensors. We also propose some polynomial time approximation algorithms with new approximation bounds for nonnegative polynomial optimization problems over unit spheres. Furthermore, we develop an efficient and effective algorithm for the maximum clique problem.

APA, Harvard, Vancouver, ISO, and other styles

7

Rahbary, Asr M. A. "Computer assisted machine tool part-program optimisation." Thesis, Coventry University, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.279418.

Full text

APA, Harvard, Vancouver, ISO, and other styles

8

Fraser-Andrews, G. "Numerical techniques for singular optimal trajectories." Thesis, University of Hertfordshire, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.372080.

Full text

Abstract:

The objectives of the subject-matter of this thesis were to appraise some methods of solving non-singular optimal control problems by their degree of success in tackling four chosen problems and then to try the most promising methods on chosen singular problems. In Part I of this thesis, the chosen problems are attempted by quasilinearisation, two versions of shooting, Miels's method, differential dynamic programming and two versions of parameterisation . Conclusions on the various methods are given. NOC shooting, developed by the Numerical Optimisation Centre of The Hatfield Polytechnic, and

APA, Harvard, Vancouver, ISO, and other styles

9

Jones, R. "Numerical optimisation techniques applied to problems in continuum mechanics." Thesis, University of Nottingham, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.378760.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

Wang, Tao. "Numerical simulation and optimisation for shot peen forming processes." Thesis, University of Cambridge, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.620031.

Full text

APA, Harvard, Vancouver, ISO, and other styles

11

Abuladze, Vissarion. "Numerical analysis and shape optimisation of concrete gravity dams." Thesis, London South Bank University, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.336375.

Full text

Abstract:

The Finite Element and Boundary Element Methods are both well established numerical techniques for analysing a wide range of engineering problems. In the present thesis these numerical techniques are used for obtaining a more realistic picture of various characteristics of concrete gravity dams. The present work addresses the behaviour of gravity dams under static loading, and the developed analysis procedure/computer package can cater for a wide range of dam characteristics including: the three-dimensional behaviour of a gravity dam-foundation-abutments system; the non-linear behaviour of a d

APA, Harvard, Vancouver, ISO, and other styles

12

Lewis, Andrew. "Parallel Optimisation Algorithms for Continuous, Non-Linear Numerical solutions." Thesis, Griffith University, 2004. http://hdl.handle.net/10072/367382.

Full text

Abstract:

In computational science and engineering there are growing numbers of increasingly sophisticated, rigorous and realistic numerical simulations of physical systems. Detailed knowledge of a particular area of enquiry is expressed in mathematical terms, realised in computer programs and run on increasingly powerful computer systems. The use of such simulations is now commonplace in a growing collection of industrial design areas. Often, users of these models want to understand their behaviour in response to a variety of input stimuli, bounded by various operational parameters. Commonplace in the

APA, Harvard, Vancouver, ISO, and other styles

13

Lee, Wei R. "Computational studies of some static and dynamic optimisation problems." Thesis, Curtin University, 1999. http://hdl.handle.net/20.500.11937/1492.

Full text

Abstract:

In this thesis we shall investigate the numerical solutions to several important practical static and dynamic optimization problems in engineering and physics. The thesis is organized as follows.In Chapter 1 a general literature review is presented, including motivation and development of the problems, and existing results. Furthermore, some existing computational methods for optimal control problems are also discussed.In Chapter 2 the design of a semiconductor device is posed as an optimization problem: given an ideal voltage-current (V - I) characteristic, find one or more physical and geome

APA, Harvard, Vancouver, ISO, and other styles

14

Agbede, O. A. "Numerical simulation and optimisation studies of groundwater in northern Nigeria." Thesis, City University London, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.355577.

Full text

APA, Harvard, Vancouver, ISO, and other styles

15

Cowie, Andrew Richard. "Numerical optimisation of building thermal and energy performance in hospitals." Thesis, University of Leeds, 2017. http://etheses.whiterose.ac.uk/16460/.

Full text

Abstract:

This thesis details the development and testing of a metamodel-based building optimisation methodology dubbed thermal building optimisation tool (T-BOT), designed as an information gathering framework and decision support tool rather than a design automator. Initial samples of building simulations are used to train moving least squares regression (MLSR) meta-models of the design space. A genetic algorithm (GA) is then used to optimise with the dual objectives of minimising time-averaged thermal discomfort and energy use. The optimum trade-off is presented as a Pareto front. Adaptive coupling f

APA, Harvard, Vancouver, ISO, and other styles

16

Sim, Lik Fang. "Numerical and experimental optimisation of a high performance heat exchanger." Thesis, Sheffield Hallam University, 2007. http://shura.shu.ac.uk/20362/.

Full text

Abstract:

The aim of this research is to numerically and experimentally scrutinise the thermal performance of a typical heat exchanger fitted in a domestic condensing boiler. The optimisation process considered the pins' geometry (circular pins and elliptical pins), pins' spacing, pitch distance, the pressure drop across the heat chamber and the occurrence of thermal hot spots. The first part of the study focused on the effect of altering the circular pins spacing and pins pitch distance of the heat exchanger. Computational Fluid Dynamics (CFD) is used to scrutinise the thermal performance and the air f

APA, Harvard, Vancouver, ISO, and other styles

17

VENTURI, Valerio. "ADVANCED NUMERICAL METHODS FOR THE DYNAMIC OPTIMISATION OF MECHANICAL COMPONENTS." Doctoral thesis, Università degli studi di Ferrara, 2009. http://hdl.handle.net/11392/2388668.

Full text

Abstract:

This PhD thesis concerns the development and assessment of innovative methodologies for simulating and improving the dynamic behaviour of mechanical components. In particular, two correlated issues are addressed herein: hybrid FE/LP gear pump modelling as a tool for foreseeing and optimising vibration behaviour in operational conditions; a new methodology for vibration reduction by applying damping patches in appropriate positions. In the field of positive displacement pump modelling, external gear pumps were analysed with the aim of developing ! ! "#! advanced methodologies which

APA, Harvard, Vancouver, ISO, and other styles

18

Melliani, Mohamed. "Analyse numérique d'algorithmes proximaux généralisés en optimisation convexe." Rouen, 1997. http://www.theses.fr/1997ROUES030.

Full text

Abstract:

La thèse a pour objet l'étude d'une généralisation de l'algorithme du point proximal en optimisation convexe tant d'un point de vue théorique que numérique. L'équivalent de cette généralisation pour l'algorithme de Tikhonov est également proposé. S'inscrivant, dans un premier temps, dans le cadre de la convergence variationnelle, la méthode proximale généralisée est tout d'abord combinée avec les méthodes des pénalités. Puis, lorsqu'appliquée au problème dual, elle permet d'obtenir de nouvelles méthodes de multiplicateurs, différentes de celles introduites par Eckstein et Teboulle. Ces méthode

APA, Harvard, Vancouver, ISO, and other styles

19

Lee, Wei R. "Computational studies of some static and dynamic optimisation problems." Curtin University of Technology, School of Mathematics and Statistics, 1999. http://espace.library.curtin.edu.au:80/R/?func=dbin-jump-full&object_id=10284.

Full text

Abstract:

In this thesis we shall investigate the numerical solutions to several important practical static and dynamic optimization problems in engineering and physics. The thesis is organized as follows.In Chapter 1 a general literature review is presented, including motivation and development of the problems, and existing results. Furthermore, some existing computational methods for optimal control problems are also discussed.In Chapter 2 the design of a semiconductor device is posed as an optimization problem: given an ideal voltage-current (V - I) characteristic, find one or more physical and geome

APA, Harvard, Vancouver, ISO, and other styles

20

Kraitong, Kwanchai. "Numerical modelling and design optimisation of Stirling engines for power production." Thesis, Northumbria University, 2012. http://nrl.northumbria.ac.uk/8100/.

Full text

Abstract:

This research is in the area of Thermal Energy Conversion, more specifically, in the conversion of solar thermal energy. This form of renewable energy can be utilised for production of power by using thermo-mechanical conversion systems – Stirling engines. The advantage of such the systems is in their capability to work on low and high temperature differences which is created by the concentrated solar radiation. To design and build efficient, high performance engines in a feasible period of time it is necessary to develop advanced mathematical models based on thermodynamic analysis which accur

APA, Harvard, Vancouver, ISO, and other styles

21

Sharkey, Patrick S. "Optimisation of charge-air coolers for vehicular applications using numerical techniques." Thesis, University of Brighton, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.309180.

Full text

APA, Harvard, Vancouver, ISO, and other styles

22

Pohl, Julien. "Turbine stator well heat transfer and design optimisation using numerical methods." Thesis, University of Leeds, 2016. http://etheses.whiterose.ac.uk/15939/.

Full text

Abstract:

Engine components are commonly exposed to air temperatures exceeding the thermal material limit in order to increase the overall engine performance and to maximise the engine specific fuel consumption. To prevent the overheating of the materials and thus the reduction of the component life, an internal flow system must be designed to cool the critical engine parts and to protect them. As the coolant flow is bled from the compressor and not used for the combustion an important goal is to minimise the amount of coolant in order to optimise the overall engine performance. Predicting the metal tem

APA, Harvard, Vancouver, ISO, and other styles

23

Obayopo, S. O. (Surajudeen Olanrewaju). "Performance enhancement in proton exchange membrane cell - numerical modeling and optimisation." Thesis, University of Pretoria, 2012. http://hdl.handle.net/2263/26247.

Full text

Abstract:

Sustainable growth and development in a society requires energy supply that is efficient, affordable, readily available and, in the long term, sustainable without causing negative societal impacts, such as environmental pollution and its attendant consequences. In this respect, proton exchange membrane (PEM) fuel cells offer a promising alternative to existing conventional fossil fuel sources for transport and stationary applications due to its high efficiency, low-temperature operation, high power density, fast start-up and its portability for mobile applications. However, to fully harness th

APA, Harvard, Vancouver, ISO, and other styles

24

Hall, James. "Geometry and topology optimisation with Eulerian and Lagrangian numerical fluid models." Thesis, University of Bristol, 2016. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.702216.

Full text

Abstract:

Although design optimisation has been well explored using mesh-based approaches, little work has been performed with meshless simulation. Equally, design optimisation has been well explored for methods capable of representing a single design topology, but much less well explored are methods that allow for optimisation of design geometry and topology. To allow for topology changes in design, a new volume-based parameterisation method is proposed which uses the fraction of volume that is solid in an underlying parameterisation grid as the design variables. This technique can be easily used with

APA, Harvard, Vancouver, ISO, and other styles

25

Holovatch, T. "Complex transportation networks : resilience, modelling and optimisation." Thesis, Coventry University, 2011. http://curve.coventry.ac.uk/open/items/eafefd84-ff08-43cf-a544-597ee5e63237/1.

Full text

APA, Harvard, Vancouver, ISO, and other styles

26

Kozlowski, Fryderyk. "Numerical simulation and optimisation of organic light emitting diodes and photovoltaic cells." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2005. http://nbn-resolving.de/urn:nbn:de:swb:14-1134592504212-65990.

Full text

Abstract:

A numerical model and results for the quantitative simulation of multilayer organic light emitting diode (OLED) and organic solar cell (OSC) are presented. In the model, effects like bipolar charge carrier drift and diffusion with field-dependent mobilities, trapping, dopants, indirect and direct bimolecular recombination, singlet Frenkel exciton diffusion, normal decay and quenching effects are taken into account. For an adequate description of multilayer devices with energetic barriers at interfaces between two adjacent organic layers, thermally assisted charge carrier hopping through the in

APA, Harvard, Vancouver, ISO, and other styles

27

Sosa, Paz Carlos. "Numerical optimisation methods for power consumption in multi-hop mobile phone networks." Thesis, University of Birmingham, 2010. http://etheses.bham.ac.uk//id/eprint/752/.

Full text

Abstract:

In recent years the importance of multi hop wireless networks has been growing mainly due to key factors such as: no backbone infrastructure or cost of installation are required and the network can be rapidly deployed and configured. A main problem in this kind of networks is to establish an efficient use of the power involved in the communication between network devices. In this dissertation, we present two different mathematical models which represent a multi hop wireless network: The first model considers the joint routing, scheduling and power control for TDMA/CDMA multi hop wireless netwo

APA, Harvard, Vancouver, ISO, and other styles

28

Hill, David Charles. "A methodology for numerical estimation of physical sediment parameters in coastal waters." Thesis, Bangor University, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.484083.

Full text

APA, Harvard, Vancouver, ISO, and other styles

29

Brayshaw, Damien. "Use of numerical optimisation to determine on-limit handling behaviour of race cars." Thesis, Cranfield University, 2004. http://hdl.handle.net/1826/4506.

Full text

Abstract:

The aim of this research is to use numerical optimisation to investigate the on-limit behaviour of an open wheel downforce type race car using the best compromise of modelling accuracy and computational effort. The current state of lap simulation methods are identified, and the GG speed diagram is described. The use of constrained optimisation, which is a form of optimal control, is used to develop the methods described in this thesis. A seven degree of freedom vehicle model validated by other researchers is used for method validation purposes, and is extended, where possible, to make the mode

APA, Harvard, Vancouver, ISO, and other styles

30

Wise, John Nathaniel. "Inverse modelling and optimisation in numerical groundwater flow models using proportional orthogonal decomposition." Thesis, Stellenbosch : Stellenbosch University, 2015. http://hdl.handle.net/10019.1/97116.

Full text

Abstract:

Thesis (PhD)--Stellenbosch University, 2015.<br>ENGLISH ABSTRACT: Numerical simulations are widely used for predicting and optimising the exploitation of aquifers. They are also used to determine certain physical parameters, for example soil conductivity, by inverse calculations, where the model parameters are changed until the model results correspond optimally to measurements taken on site. The Richards’ equation describes the movement of an unsaturated fluid through porous media, and is characterised as a non-linear partial differential equation. The equation is subject to a number of

APA, Harvard, Vancouver, ISO, and other styles

31

Fourie, Jecois. "Numerical optimisation of the gating system of a titanium alloy inlet valve casting." Thesis, Cape Peninsula University of Technology, 2014. http://hdl.handle.net/20.500.11838/1290.

Full text

Abstract:

Dissertation submitted in fulfilment of the requirements for the degree Master of Technology: Mechanical Engineering in the Faculty of Engineering at the Cape Peninsula University of Technology 2014<br>The research described in this dissertation investigates the feasibility of casting inlet valves for an internal combustion engine using Ti6Al4V alloy. The engine valves operate in an extreme environment under high thermal cycles – this requires a material that can withstand such exposures. Ti6Al4V is the most common titanium alloy with high temperature creep and fatigue resistant behavi

APA, Harvard, Vancouver, ISO, and other styles

32

Mahfoudhi, Marouen. "Numerical optimisation of electron beam physical vapor deposition coatings for arbitrarily shaped surfaces." Thesis, Cape Peninsula University of Technology, 2015. http://hdl.handle.net/20.500.11838/2225.

Full text

Abstract:

Thesis (MTech (Mechanical Engineering))--Cape Peninsula University of Technology.<br>For the last few decades, methods to improve the engine efficiency and reduce the fuel consumption of jet engines have received increased attention. One of the solutions is to increase the operating temperature in order to increase the exhaust gas temperature, resulting in an increased engine power. However, this approach can be degrading for some engine parts such as turbine blades, which are required to operate in a very hostile environment (at ≈ 90% of their melting point temperature). Thus, an additional

APA, Harvard, Vancouver, ISO, and other styles

33

Wise, John Nathaniel. "Inverse modelling and optimisation in numerical groundwater flow models using proper orthogonal decomposition." Thesis, Saint-Etienne, EMSE, 2015. http://www.theses.fr/2015EMSE0773/document.

Full text

Abstract:

Des simulateurs numériques sont couramment utilisés pour la prédiction et l'optimisation de l'exploitation d'aquifères et pour la détermination de paramètres physiques (e.g perméabilité) par calcul inverse. L'équation de Richards, décrit l'écoulement d'un fluide dans un milieu poreux non saturé. C'est une équation aux dérivées partielles non linéaires, dont la résolution numérique en grande dimension 3D est très coûteuse et en particulier pour du calcul inverse.Dans ce travail, une méthode de réduction de modèle (ROM) est proposée par une décomposition orthogonale propre (POD) afin de réduire

APA, Harvard, Vancouver, ISO, and other styles

34

Maggiolo, Dario. "Numerical modeling and fluid-dynamic optimisation of fuel cells and flow batteries systems." Doctoral thesis, Università degli studi di Padova, 2017. http://hdl.handle.net/11577/3424775.

Full text

Abstract:

Nowadays, the energy challenge is one of the largest driving forces behind many research efforts. Future energy strategies include smart ways to store and convert energy on demand. On this exciting perspective, fuel cells and flow batteries play a key role, the former in converting energy into propulsion, the latter in storing renewable energy surplus. Nevertheless, some main technological issues still must be overcome, such as limited peak performances often caused by poor fluid-mechanic efficiency. The fluid-dynamic optimisation of fuel cells and flow batteries systems is the main aim of the

APA, Harvard, Vancouver, ISO, and other styles

35

Rambalee, Prevlen. "Identification of desired operational spaces via numerical methods." Diss., University of Pretoria, 2012. http://hdl.handle.net/2263/25314.

Full text

Abstract:

Plant efficiency and profitability are becoming increasingly important and operating at the most optimal point is a necessity. The definition of proper operational bounds on output variables such as product quality, production rates etc., is critical for plant optimisation. The use of operational bounds that do not lie within the region of the output operational space of the plant can result in the control system attempting to operate the plant in a non attainable region. The use of operational bounds that lie within the bounds of the output operational space of the plant and if the output ope

APA, Harvard, Vancouver, ISO, and other styles

36

BARALIS, MATTEO. "Optimisation of geothermal resources in urban areas." Doctoral thesis, Politecnico di Torino, 2020. http://hdl.handle.net/11583/2842491.

Full text

APA, Harvard, Vancouver, ISO, and other styles

37

Quirós, Rodríguez Alejandro. "Numerical methods for modeling and optimization of interfacial flows." Electronic Thesis or Diss., Sorbonne université, 2024. http://www.theses.fr/2024SORUS303.

Full text

Abstract:

Dans la première partie de cette thèse, une nouvelle méthode cut-cell conservative est développée pour simuler les écoulements interfaciaux. La cest couplée à la méthode des lignes de niveaux (ou level-set) pour le suivi d'interface. Une attention particulière est portée à la structure des opérateurs discrets, réalisée afin d'imiter celle de leurs homologues continus, de sorte que les quantités primaires et secondaires, telles que l'énergie cinétique, soient conservées dans les limites applicables. La méthodologie est d'abord appliquée aux interfaces stationnaires. L'équation de Poisson est ut

APA, Harvard, Vancouver, ISO, and other styles

38

Facchinelli, Nicola. "Microstructural and technological optimisation of magnesium alloys." Doctoral thesis, Università degli studi di Padova, 2013. http://hdl.handle.net/11577/3426654.

Full text

Abstract:

Magnesium is one of the most abundance element in nature, and it's characterised by a lower density than aluminium. These characteristics confer great potential to magnesium alloys, which are so used for specialised applications, like for military purposes and in the aerospace industry. While some magnesium alloys, including the AM60B alloy, are historically associated to high pressure die casting, for such applications the magnesium alloy components are usually produced by the gravity casting process, in order to minimise the defect's content and to achieve better castings' mechanical propert

APA, Harvard, Vancouver, ISO, and other styles

39

Jankovic, Anja. "Towards Online Landscape-Aware Algorithm Selection in Numerical Black-Box Optimization." Electronic Thesis or Diss., Sorbonne université, 2021. http://www.theses.fr/2021SORUS302.

Full text

Abstract:

Les algorithmes d'optimisation de boîte noire (BBOA) sont conçus pour des scénarios où les formulations exactes de problèmes sont inexistantes, inaccessibles, ou trop complexes pour la résolution analytique. Les BBOA sont le seul moyen de trouver une bonne solution à un tel problème. En raison de leur applicabilité générale, les BBOA présentent des comportements différents lors de l'optimisation de différents types de problèmes. Cela donne un problème de méta-optimisation consistant à choisir l'algorithme le mieux adapté à un problème particulier, appelé problème de sélection d'algorithmes (AS

APA, Harvard, Vancouver, ISO, and other styles

40

Van, der Merwe Helena. "Development of a numerical tool for the optimisation of vascular prosthesis towards physiological compliance." Master's thesis, University of Cape Town, 2007. http://hdl.handle.net/11427/3479.

Full text

Abstract:

Includes bibliographical references (leaves 140-147).<br>It has been proposed that if a vascular prosthesis is to more closely approximate the mechanical behaviour of a native vessel, it should similarly feature a multi-component structure. One of the components could be a metal support structure, similar to an endovascular stent. The objective of the project was to develop a numerical tool, using the Finite Element Method (FEM) to aid in the development and optimization of such a metallic support structure. This tool was used to simulate the behaviour of different designs under the simulated

APA, Harvard, Vancouver, ISO, and other styles

41

Leusink, Debbie. "Advanced numerical tools for aerodynamic optimization of helicopter rotor blades." Thesis, Paris, ENSAM, 2013. http://www.theses.fr/2013ENAM0010.

Full text

Abstract:

La conception aérodynamique des pales du rotor principal d’un hélicoptère doitsimultanément prendre en compte plusieurs objectifs relatifs aux critères du vol stationnaire etvol d’avancement. Cette thèse vise à développer une boucle d’optimisation automatiséecombinant des algorithmes d’optimisation avancés et des outils de simulation. Deux outils desimulation sont employés pour la prédiction des performances rotor : le code de mécanique devol HOST, ainsi que le code de Mécanique des Fluides Numérique (MFN) elsA. Une analyse deces outils est effectuée pour des cas test bien documentés afin d’es

APA, Harvard, Vancouver, ISO, and other styles

42

Stringer, Robert. "Numerical investigation of cross-flow tidal turbine hydrodynamics." Thesis, University of Bath, 2018. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.760981.

Full text

Abstract:

The challenge of tackling global climate change and our increasing reliance on power means that new and diverse renewable energy generation technologies are a necessity for the future. From a number of technologies reviewed at the outset, the cross-flow tidal turbine was chosen as the focus of the research. The numerical investigation begins by choosing to model flow around a circular cylinder as a challenging benchmarking and evaluation case to compare two potential solvers for the ongoing research, ANSYS CFX and OpenFOAM. A number of meshing strategies and solver limitations are extracted, f

APA, Harvard, Vancouver, ISO, and other styles

43

Scotland, Ian. "Analysis of horizontal deformations to allow the optimisation of geogrid reinforced structures." Thesis, Loughborough University, 2016. https://dspace.lboro.ac.uk/2134/23323.

Full text

Abstract:

Geogrid reinforced structures have been successfully used for over 25 years. However their design procedures have remained largely focused on ultimate failure mechanisms, originally developed for steel reinforcements. These are widely considered over conservative in determining realistic reinforcement and lateral earth stresses. The poor understanding of deformation performance led many design codes to restrict acceptable soils to selected sand and gravel fills, where deformation is not as concerning. Within UK construction there is a drive to reduce wastage, improve efficiency and reduce asso

APA, Harvard, Vancouver, ISO, and other styles

44

Raithatha, Ankor Mahendra. "Incremental sheet forming : modelling and path optimisation." Thesis, University of Oxford, 2008. http://ora.ox.ac.uk/objects/uuid:89b0ac1e-cab4-4d80-b352-4f48566c7668.

Full text

Abstract:

Incremental sheet forming (ISF) is a novel metal shaping technology that is economically viable for low-volume manufacturing, customisation and rapid-prototyping. It uses a small tool that is controlled by a computer-numerically controlled sequence and the path taken by this tool over the sheet defines the product geometry. Little is currently known about how to design the tool-path to minimise geometric errors in the formed part. The work here addresses this problem by developing a model based tool-path optimisation scheme for ISF. The key issue is how to generate an efficient model for ISF t

APA, Harvard, Vancouver, ISO, and other styles

45

Song, Zixu. "Software engineering abstractions for a numerical linear algebra library." Thesis, University of Manchester, 2012. https://www.research.manchester.ac.uk/portal/en/theses/software-engineering-abstractions-for-a-numerical-linear-algebra-library(68304a9b-56db-404b-8ffb-4613f5102c1a).html.

Full text

Abstract:

This thesis aims at building a numerical linear algebra library with appropriate software engineering abstractions. Three areas of knowledge, namely, Numerical Linear Algebra (NLA), Software Engineering and Compiler Optimisation Techniques, are involved. Numerical simulation is widely used in a large number of distinct disciplines to help scientists understand and discover the world. The solutions to frequently occurring numerical problems have been implemented in subroutines, which were then grouped together to form libraries for ease of use. The design, implementation and maintenance of a NL

APA, Harvard, Vancouver, ISO, and other styles

46

Bird, Stefan Charles, and stbird@seatiger org. "Adaptive Techniques for Enhancing the Robustness and Performance of Speciated PSOs in Multimodal Environments." RMIT University. Computer Science and IT, 2008. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20081027.122244.

Full text

Abstract:

This thesis proposes several new techniques to improve the performance of speciated particle swarms in multimodal environments. We investigate how these algorithms can become more robust and adaptive, easier to use and able to solve a wider variety of optimisation problems. We then develop a technique that uses regression to vastly improve an algorithm's convergence speed without requiring extra evaluations. Speciation techniques play an important role in particle swarms. They allow an algorithm to locate multiple optima, providing the user with a choice of solutions. Speciation also pro

APA, Harvard, Vancouver, ISO, and other styles

47

Rajaguru, Pushparajah. "Reduced order modelling and numerical optimisation approach to reliability analysis of microsystems and power modules." Thesis, University of Greenwich, 2014. http://gala.gre.ac.uk/13593/.

Full text

Abstract:

The principal aim of this PhD program is the development of an optimisation and risk based methodology for reliability and robustness predictions of packaged electronic components. Reliability based design optimisation involves the integration of reduced order modelling, risk analysis and optimisation. The increasing cost of physical prototyping and extensive qualification testing for reliability assessment is making virtual qualification a very attractive alternative for the electronics industry. Given the availability of low cost processing technology and advanced numerical techniques such a

APA, Harvard, Vancouver, ISO, and other styles

48

SALVI, Jonathan. "Optimisation of Tuned Mass Damper Devices Towards Structural Vibration Reduction: Theoretical Settings and Numerical Analyses." Doctoral thesis, Università degli studi di Bergamo, 2014. http://hdl.handle.net/10446/224063.

Full text

Abstract:

The present doctoral thesis concerns theoretical concepts and numerical studies on the optimisation of Tuned Mass Damper (TMD) devices towards the control and reduction of structural dynamic responses, with specific reference to the context of civil and seismic engineering. The fundamental background of the optimisation of the TMD parameters, also called tuning, is presented first in its main features, based on reference to the mainstream literature, and in the assessing the relevance of the structural properties and of the role of the characteristics of the external excitation. A comprehensi

APA, Harvard, Vancouver, ISO, and other styles

49

Magnier, Clara. "Modélisation et optimisation de la thérapie ultrasonore cavitationnelle des valves cardiaques." Electronic Thesis or Diss., Université Paris sciences et lettres, 2025. http://www.theses.fr/2025UPSLS003.

Full text

Abstract:

La thérapie ultrasonore non-invasive des valves cardiaques a été démontrée faisable chez40 patients humains dans le cadre d’une étude clinique menée en partenariat entre le laboratoirePhysique pour la Médecine, Cardiawave et l’Hôpital Européen Georges Pompidou. La thérapieultrasonore repose sur la focalisation de pulses courts et de très haute intensité permettant lacréation de cavitation dans la zone focale et donc l’assouplissement du tissu calcifié par desphénomènes mécaniques uniquement.Les résultats de cette première étude sont prometteurs et démontrent à la fois l’innocuité dela techniqu

APA, Harvard, Vancouver, ISO, and other styles

50

Cooper, Jonathan Paul. "Automatic validation and optimisation of biological models." Thesis, University of Oxford, 2009. http://ora.ox.ac.uk/objects/uuid:24b96d62-b47c-458d-9dff-79b27dbdc9f2.

Full text

Abstract:

Simulating the human heart is a challenging problem, with simulations being very time consuming, to the extent that some can take days to compute even on high performance computing resources. There is considerable interest in computational optimisation techniques, with a view to making whole-heart simulations tractable. Reliability of heart model simulations is also of great concern, particularly considering clinical applications. Simulation software should be easily testable and maintainable, which is often not the case with extensively hand-optimised software. It is thus crucial to automate

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!