Engineering, Department of
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The Department of Engineering is internationally renowned for the quality of its research. In the 2008 Research Assessment Exercise (RAE), the Department submitted over 90% of its academic staff. The quality profile, as judged by the RAE, showed that 90% of the research was internationally recognised, internationally excellent or world leading in terms of originality, significance, and rigour.

The Department of Engineering has six research groups:

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Recent Submissions

Modelling the non-linear motion of the rat central airways

Advances in volumetric medical imaging techniques allowed the subject-specific modelling of the bronchial flow through the first few generations of the central airways using computational fluid dynamics (CFD). However, a reliable CFD prediction of the bronchial flow requires modelling of the inhomogeneous deformation of the central airways during breathing. This paper addresses this issue by introducing two models of the central airways motion. The first model utilises a node-to-node mapping ...

Ibrahim, Gihad; Rona, Aldo; Hainsworth, Sarah V.

New environments for neurophysiological investigations.

The main topics of research are in the sub-areas of neurophysiology that are concerned with measurement of the electrical activity arising from contracting muscle (EMG) and from the surface of the scalp (EEG). Investigations are restricted to the surface-recorded interference pattern EMG, and to the EEG waveform recorded in response to sensory stimulation, known as the evoked potential (EP). The EMG and EP are representative of two important classes of signal commonly encountered in engineeri...

Sehmi, Arvindra Singh.

The creep and failure of engineering ceramics under multiaxial states of stress.

The effort dedicated to developing the material properties of engineering ceramics has not been accompanied by a similar effort in developing design methods that would allow engineers to make full use of these materials. In particular the high temperature creep behaviour of engineering ceramics has received little attention. In this thesis two parallel approaches, one theoretical and one practical, have been taken towards the final aim of constructing design codes for the creep of ceramic mat...

Searle, Andrew Arthur.

Automated synthesis of lumped linear three-terminal networks.

The classical techniques of network synthesis are restricted to designs in idealized elements with series-parallel configurations. This research is an investigation into the possibility of unrestricted synthesis employing alternative techniques which involve optimization by computer. In this method the values of the elements are modified such that an error function is reduced. If the current network is unable to satisfy the required network response then the components have to be modified. A ...

Savage, W. H.

A review and the development of bounding methods in continuum mechanics.

Energy theorems and kindred inequalities have long been a basis for the analysis of redundant structures and the material continuum. In the first section of this thesis we trace the development of the principal results of elasticity, time-independent inelasticity and creep, from the principle of virtual work and the well-known theorems of linear elasticity to recent results which describe the deformation of general inelastic materials under time-varying loads. In certain instances where incom...

Scaife, J. A.

The computation of waveguide vector fields and the generation of field patterns using computer graphics.

Abstract not available.

Santos, M. L. X. dos.

Simultaneous stabilization of multivariable linear systems.

The simultaneous stabilization of a collection of systems has received considerable attention over a number of years. The practical motivation for a solution to the simultaneous stabilization problem (SSP) stems from the stability requirements of multimode systems in practical engineering. For example, a real plant may be subjected to several modes due to the failure of sensors and nonlinear systems are often represented by a set of linear models for design purposes. To examine these problems...

Saif, Abdul-Wahid Abdul-Aziz.

The mathematical modelling of ball-joints with friction.

At present the effects of friction are not included in three-dimensional mechanism simulation packages because of the difficulty of determining a friction model for joints such as the spherical joint where the frictional resistance to motion depends not only upon the coefficient of friction and the magnitude of the loading on the joint but also on the pressure distribution within the joint resulting from that loading. Thus the basis of this thesis has been the development of a mathematical mo...

Sage, R. M.

Photon correlation velocimetry for the fluid flow through turbomachinery.

This thesis is concerned with the application of photon correlation velocimetry to the design of products which employ rotating components in fluids. Two examples are considered, viz. The development of turbines and compressors for power generation. The development of propulsor design for use on underwater powered vehicles. The former required the measurement of high speed gas flows (up to Mach 1.8) both within cascades and in a model turbine. The latter entailed tests on models in both a wat...

Ross, Michael McLean.

Metallurgical phase transformations in the rubbing of steels.

The formation of phase transformed material in the unlubricated rubbing of plain carbon steels using a crossed cylinders machine, in single and multiple rubs, has been investigated. Previous studies of the dry wear of steels had suggested that if the frictional flash temperatures reached values of approximately 750C, then a phase transformed material, akin to the martensitic structure of conventional ferrous metallurgy, appeared upon the rubbing surfaces. Exploratory experiments indicated tha...

Rowntree, R. A.

Temperature measurements in an argon plasma jet.

The aim of this study was to establish reliable temperature distributions, within an argon plasma jet in both the cases of an unconstrained jet discharging to the atmosphere and a jet impinging on a cooled metal surface under various input conditions. An optical technique, the Two Line Relative Intensity Method was employed with both Ionic/Atomic and Atomic/Atomic Line Combinations. Results are presented in Chapter 5 and are compared with published data in Chapter 6 and have been published.* ...

Ruddy, M. J.

Time dependent transport mechanisms in freshwater lakes.

The development and implementation of a totally predictive model for the annual thermal structure of a freshwater lake or reservoir is described in detail. Water quality depends to a great degree on dissolved oxygen profiles and nutrient concentrations and is thus governed by the temperature profile in the lake. The numerical model described here discusses fully this latter problem and also indicates strongly the direction for further research into the introduction of comprehensive biochemica...

Henderson-Sellers, Brian.

A high performance transistorised power source for MIG welding.

This research concerns an investigation into the application of Power Electronics to high performance power sources for precise and efficient control of the pulsed-current metal-inert gas (PCM) welding processes. The physical processes of the welding arc are reviewed and the characteristics of a number of power sources are considered prior to preparing the operational specification for the PCM power source. From a number of possibilities the high frequency switching regulator operating in the...

Rodrigues, Alcide Conceicao Do Rosario.

Wheel loadings on web panels of overhead crane box-girders.

In torsion-box design of twin girder overhead cranes, the bridge rail on which the lifting unit runs is positioned eccentrically on the girder, directly above one of the web plates. This web is subjected to in-plane patch loading produced by the spread of a wheel load through the overlying rail and flange. This study concerns the load carrying capacity of plate box-girder web panels subjected to a wheel load at the midspan of the panel. Distribution of a wheel load through a rail and flange i...

Robertson, Adam Patrick.

Shape as a structural design parameter.

The objective of this thesis is to present evidence to demonstrate the importance of layout in economical structural design, to review techniques by which structural shape may be handled as a design parameter and to determine the implications of varying layout in certain design situations. The thesis begins with a study of the theory of Michell structures. The difficulty of applying this theory directly to practical design problems then leads to a review of the linear approximation techniques...

Porter Goff, R. F. D.

Unsteady fluid flow around certain bluff bodies.

It is shown in this thesis that fluid dynamic forces on unsteadily moving bluff bodies depend on the history of motion as much as on the velocity and acceleration of motion. An empirical relationship between the motion of the body and the resulting force is obtained by analysing the effect of the history of motion on the fluid dynamic force at any instant. The fluid dynamic force, velocity and acceleration are obtained as functions of time, by oscillating test models in water while they are b...

Polpitiye, Sisira J.

Hamiltonian circuits in trivalent planar graphs.

The author has investigated the properties of Hamiltonian circuits in a class of trivalent planar graphs and he has attempted, with partial success, to establish conditions for the existence of Hamiltonian circuits in such graphs. Because the Hamiltonian circuits of a trivalent planar graph are related to the four-colourings of the graph some aspects of the four- colour problem are discussed. The author describes a colouring algorithm which extends the early work of Kempe, together with an al...

Price, W. L.

Wear resistance of pearlitic rail steels.

Modern railway transportation has imposed severe work conditions on the track. Wear of rails has become an important and costly phenomenon. Recent developments in the manufacture of rail steels have refined the interlamellar spacing to produce harder and more wear resistant pearlitic steels. Despite better nominal properties shown by bainitic and martensitic steels, pearlitic steels have shown lower wear rates. The aim of this study is to explain the mechanisms for the wear performance by obs...

Perez-Unzueta, Alberto Javier.

Vibrations of preloaded cylindrical shells.

A theoretical and experimental investigation of the dynamic behaviour of preloaded cylindrical shells including the effects of meridional cracking has been carried out. A Donnell-type equation is derived to study preloaded cylindrical shell vibrations. The solution is obtained using the Galerkin Method for the following initial external loads: (i) Axial compression combined with torsion (ii) Bending moment (iii) Axial compression combined with bending moment (iv) Periodic axial compression (v...

Palacios Gomez, Oscar F.

Robust pole assignment by output feedback using optimization methods.

A robust output feedback pole assignment method, which seeks to achieve a robust solution in the sense that the assigned poles are as insensitive as possible to perturbations in the system parameters, is studied. In particular, this work is concerned with pole assignment in a specified region rather than assignment to exact positions, whereby the freedom to obtain a robust solution may be realized. The robust output feedback pole assignment problem is formulated as an optimization problem wit...