Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 61 for “"design optimisation"”.
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Application of Multidisciplinary Design Optimisation to Engine Calibration Optimisation.
… aims to develop a process for engine calibration optimisation by exploiting advanced mathematical methods. Validation of this work is based upon a case study describing a steady-state Diesel engine calibration problem. The calibration optimisation problem seeks an optimal combination of actuator …
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Multi-objective robust early stage ship design optimisation under uncertainty
… to investigate possible ways to improve ship design and create efficient and economical ships. Technological improvements allow the detailed exploration of design space and assist the theory of optimisation in becoming a vital part of ship design. Advanced software tools are available to …
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Statistical Surrogate Models for Robust Design Optimisation in Reduced Dimension
… is crucial for multi-query problems such as design optimisation. However, the design of these products depends on complex and often deterministic computational models that may be expensive-to-evaluate. Consequently, it is expedient to consider these models as black-box functions, such that …
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Structural behaviour of concrete segmental lining tunnels: towards design optimisation
The deployment of engineering models and design methods divorced from the effect that mechanised shield tunnelling with tunnel boring machines (TBMs) has on concrete segmental linings (CSLs) can lead to either material waste or structural damage within the tunnel design life. Most research to date …
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Design optimisation of steel portal frames using modified distributed genetic algorithms
… algorithms and applying them in structural optimisation. Among these are the creation of new mutation schemes, adding a crossover scheme, definition of a penalty function, properties of twins, and definition of the reproduction scheme. Many optimisation problems have been designed to …
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Design Optimisation and Flow Characterisation for Future Aeroengine Axial Fan Blades
The increased need to design higher performing aerodynamic shapes has led to design optimisation cycles requiring high-fidelity CFD models and high-dimensional parametrisation schemes. The computational cost of employing global search algorithms on such scenarios has typically been prohibitive for …
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Application of Multidisciplinary Design Optimisation Frameworks for Engine Mapping and Calibration
… and effectiveness of the Multidisciplinary Design Optimisation (MDO) frameworks to optimise the multi-attribute steady state engine calibration optimisation problems. Accordingly, this research is concentrated on two aspects of the steady state engine calibration optimisation: 1) development …
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Finite element analysis and design optimisation of shaded pole induction motors
… an opportunity to take a fresh look at the design of SPIMs and this forms the backbone of my research.<br/><br/>In the research, a more accurate two-dimensional time-stepping eddy-current FE model was developed. The multi-slice technique, justified as the more efficient way to consider the …
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The Application of Computer Modelling to the Design Optimisation of a Microexcavator Digging
… the parameters which must be considered for the design of microexcavator digging arm and hydraulic system has been undertaken.<br/><br/>Fundamental mechanics and structural theories have been used to develop a structural model of the Powerfab 360WT microexcavator digging arm under static or …
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Design optimisation of a slotless brushless permanent magnet DC motor with helically-wound laminations for underwater rim-driven thrusters
… wound into a spiral.<br/>The electromagnetic design of the motor was optimised for maximum efficiency for a given propeller torque and speed. The airgap flux density in was obtained from an analytical solution of Laplace and Poisson's equations of scalar magnetic potential. Electromagnetic …
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Thermodynamic design optimisation of an open recuperative twin-shaft solar thermal Brayton cycle with combined or exclusive reheating and intercooling
… entropy generation rate. The resulting optimal design is related to, and therefore characteristic of, the cycle configuration, since the entropy generation rates in the individual components are interdependent. In this work, optimal design of three common open solar thermal Brayton cycle …
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Heterogeneous Multi-objective Optimisation in Nuclear Power Design
… the deleterious effects of heterogeneous optimisation within nuclear power design. Heterogeneous optimisation is investigated in two forms: delaying a subset of objectives, and delaying a higher fidelity search. The large computational expense and extensive runtimes of nuclear power design …
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Ultra-wideband antenna design for microwave imaging applications. Design, optimisation and development of ultra-wideband antennas for microwave near-field sensing tools, and study the matching and radiation purity of these antennas within near field environment.
… This thesis documents the development of antenna design for microwave imaging application such as breast cancer detection. The application is similar to the concept of Ground Penetrating Radar (GPR) but operating at higher frequency band. In these systems a short pulse is transmitted from an …
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Data-Driven Multidisciplinary Design and Optimisation of Future Aircraft
… thesis addresses the challenge of aerodynamic design optimisation and multi-disciplinary optimisation by introducing novel approaches that leverage model-order reduction (MOR) techniques and advanced machine learning (ML) methodologies to significantly enhance computational efficiency compared …
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Modelling and design of compact wideband and ultra-wideband antennas for wireless communications. Simulation and measurement of planer inverted F antennas (PIFAs) for contemporary mobile terminal applications, and investigations of frequency range and radiation performance of UWB antennas with design optimisation using parametric studies.
… system. However, there are some difficulties in designing UWB antenna as compared to narrowband antenna. The primary requirement of UWB antennas is be able to operate over frequencies released by the FCC. Moreover, the satisfaction of radiation properties and good time domain performance over the …
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Analysis and optimisation of the performance of nonlinear optical communication systems
… To accomplish this task we developed a general design optimisation technique, based on concepts of noise and nonlinearity management. We demonstrate the immense efficiency of the novel approach by applying it to a design optimisation of transmission lines with periodic dispersion compensation …
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Electromagnetic Modelling of Superconducting Sensor Designs
The problem of design optimisation of thin film direct current Superconducting QUantum Interference Device (SQUID) magnetometers made of YBCO (YBa2Cu3O7-x) was considered. The inductances and effective areas were calculated using the software package 3D-MLSI. Resolution and reliability issues were …
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