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  • The application of mathematical models to problems of materials handling and physical distribution.
    (1970) Watson, Lloyd Stewart
    Thesis
    This thesis describes research into the application of queueing theory to the optimum design and utilization of production line conveyors, which have a fixed distance between carriers and carry single units through a series of processing centres. A new recurrence relation is derived and used in conjunction with numerical integration techniques to construct a generalized numerical model, which allows the distribution function of the number of units in the queue at the conveyor loading point to be found under transient conditions, with a generalized distribution of time between the arrival of units at the conveyor. A standard recurrence relationship forms the basis of a numerical model, which is used to produce the transient distribution function of waiting time of a unit in a processing area and a distribution function of interstage interference, as a function of the space allocated to each processing area. The accuracy of both models is checked against analytical models using exponential arrival and service distributions. An approach to optimization of design and utilization is discussed in terms of minimization of the cost per unit produced, of labour, in process inventory, conveyor construction and space utilization. The ability of the model to predict the performance of a conveyorised production line was tested under real working conditions where the opportunity to observe steady state conditions was limited.
  • Thermosyphon flow in solar collectors
    (1978) Ranatunga, Don Baratheratna Jayantha
    Thesis
  • Synthesis of mechanisms using the Fourier series
    (1977) Stewart, Ian Thomas
    Thesis
  • The exact synthesis of a spatial trajectory
    (1977) Pennock, Gordon Robert
    Thesis
  • Two phase flowof refrigerant - 12 in capillary tubes
    (1966) Niaz, Riaz-Ul Haque
    Thesis
  • The thermohydraulic response of a nuclear reactor containment vessel to a loss-of-coolant accident.
    (1979) Marshall, Joseph
    Thesis
    A general review is given of containment technology for water-cooled nuclear reactors, including discussion of the methods of analysis of the pressure response of the containment to a loss-of-coolant accident. Particular attention is paid to considerations of heat transfer from the consequent reactor efflux in the situation of full-pressure containments, and various schemes given in the literature and used in computer codes for calculating condensation heat transfer are critically examined. An experimental study has been made in conditions typical of the postulated reactor accident situation using a rig consisting of a O 0.014 m high pressure vessel which could discharge its contents through a defined flow path into a 2 m3 steel containment vessel. The rig is instrumented to measure the instantaneous pressure and temperature distribution during a pressure vessel blowdown. It includes a system for measuring the condensation heat transfer coefficient transient in which the transient heat flux and surface temperature at a metal plug are derived from a single measurement of temperature within the plug by use of a Fourier Transform method. A simple point model analysis of the thermohydraulic conditions throughout the blowdown/ containment rig is derived and used to demonstrate the effect on prediction of containment pressure response of various heat transfer schemes and the relationship to the measured response. A new heat transfer scheme is found, based on the measured heat transfer transients which, when used in the derived code, gives reasonable fit to the measured pressure transients over a wide range of initial conditions.
  • Design of shafts for general engineering applications.
    (1978) Drydale, German V.
    Thesis
    In this work a design procedure for determining of shaft sizes is outlined. The design procedure is a summary and a result of a literature search with the aim of assisting an engineer, practicing in general engineering. The author does not postulate any theoretical concepts and does not contribute any new experimental data. However, in setting out the design procedure, the areas lacking such data are highlighted, so that the future research will make the procedure more complete and useful. This work is limited to the shafts encountered in general industrial engineering and excludes such fields as aircraft, automotive, thermal and highly corrosive environments. The design procedure consists of the following three basic stages: 1. Preliminary Design 2. Geometric Design 3. Verification. THE PRELIMINARY DESIGN enables the designer of a new machine to predict the size of a shaft, having knowledge of the load conditions and only a conceptual sketch of the shaft and the components associated with the shaft. THE GEOMETRIC DESIGN is actually a detailed layout of the shaft and its components. During this stage the shaft is shaped to satisfy the requirements of other components. At this stage the stress risers are introduced, however the number of these stress risers can be reduced by considering the alternative solutions suggested in this work. IN THE VERIFICATION STAGE the shaft suitability for the load conditions is assessed by the value of the RESERVE OF STRENGTH (OR FACTOR OF SAFETY) designed into the shaft. It is suggested that the statutory bodies and the Standards Associations draw up a comprehensive list of the reserve of strength values for the various industrial shaft applications, so that the shafts may be designed with greater economy and confidence. An example of shaft calculations illustrating the proposed design procedure is included.