Mechanical Engineering - Theses

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    Design and implementation of intelligent hierarchical systems
    Rattasiri, Waratt (University of Melbourne, 2006)
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    Design and implementation of intelligent hierarchical systems
    Rattasiri, Waratt (University of Melbourne, 2006)
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    Mass reduction of fatigue-limited, safety-critical (FLSC), ferrous metal automotive components by forged light alloy substitution
    Leary, Martin John ( 2006)
    The substitution of ferrous metal with forged light alloys in Fatigue-Limited, Safety- Critical (FLSC) applications provides an opportunity to achieve mass reduction. However, the use of forged light alloys in FLSC applications is limited by: * the complexity and uncertainties inherent in fatigue-limited design * material selection procedures that do not actively engage with the unique requirements of light alloys * a limited understanding of the technical design, manufacture and test requirements for light alloy production * limited available data on the optimisation of light alloy processing for fatiguelimited applications This thesis offers original contributions to the design and manufacture requirements associated with mass reduction of FLSC ferrous metal automotive components by forged light alloy substitution. Original contributions include: * enhanced concept generation and project management tools (Chapter 2) * design tools to assist the resolution of complexity and uncertainty in fatigue-limited design (Chapter 3) * novel material selection methods for fatigue-limited design (Chapter 4) * novel experimental outcomes on the influence of billet processing on the fatigue strength of an important light alloy (Chapter 6).
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    Flow over a body of revolution in a steady turn
    GREGORY, PAUL ( 2006)
    Experiments investigating the flow over a body in a steady turn require the use of a rotating arm. This apparatus has several limitations, including the restriction of only making one revolution before the body passes through its own wake, which in turn places restrictions on the available time to record measurements. Kinematic transformation using appropriately curved bodies in rectilinear flow overcomes these limitations, but introduces new problems. In this study, Computational Fluid Dynamics (CFD) was used to compare the flow over a body of revolution in a steady turn to the flow generated by the equivalent curved body. To ensure that the angle of attack between the straight body and the curved flow streamlines are preserved for the corresponding curved body placed in straight streamlines, the method of Gurzhienko (1934) was used. This is the first time that modern CFD techniques have been used to analyse the method of curved bodies for three-dimensional applications.
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    Exploring the limits of hydrogen assisted jet ignition
    Hamori, Ferenc ( 2006-03)
    Homogeneously charged spark ignition (SI) engines are unable to stabilise the combustion in ultra lean mixtures, therefore they operate with a near stoichiometric air-fuel ratio (AFR) at all load points. This produces high engine out NOx and CO emissions with a compromise on fuel consumption. Moreover, stoichiometric operation is needed for effective operation of a three way catalyst, which is not adequate to meet future fuel consumption targets. (For complete abstract open document)