Engineering

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  • Harmoniac - a digital signal processor
    (1981) Connor, Philip Michael
    Thesis
  • Oil pressure effects in H.V. underground cables
    (1980) Walker, Graham P.
    Thesis
    The basis of the design of the oil system of a H.V. oil filled cable circuit is considered in particular the choice of oil feed locations along the cable route. Methods are established for determining the oil pressure tank requirements and the oil pressure response on application of step or pulse loads for typical oil sections of a single core H.V. oil filled cable circuit. These methods are applied to an existing 132 KV installation and minimum oil pressure tankage requirements and the maximum and minimum transient oil pressures considering various loading conditions determined. To establish the minimum transient oil pressure the oil pressures occurring on switching off various continuous loads are compared to that occurring on switching off load shortly after having switched on. Recommendations are made for similar circuits based on the loading condition giving the minimum transient oil pressure. Possible ways of verifying the theoretical methods and en electrical analogue of the oil system are considered.
  • Digital full duplex on two wire subscriber line
    (1981) Hardadi, Moehamad
    Thesis
  • Multivariable statistical modelling and its application
    (1984) Lee, Kong Been
    Thesis
    The work described in this thesis is concerned with the study of statistical identification of discrete, dynamic, multi-input and multi-output CNIMQ) linear models for complex industrial processes. Contributions that have been made in this area include: 1. The development of a MIMO estimation procedure, that is computationally quite simple, to estimate the parameters in the discrete MIMO model. The resulting parameters are shown to be asymptotically equivalent to the maximum likelihood estimators. 2. The development of a suitable methodology so that the estimation procedure can give results in the practical identification case where the data is not always ideal. The ideas and methodology developed in the thesis are tested on practical data collected from a real plant. The data has been logged from a 50QMW boiler— turbine unit at the Electricity Commission of New South Wales's Liddell Power Station. Good models have been obtained using the methodology developed, and the models give output responses that are in good agreement with the plant output responses. In this thesis, we have successfully demonstrated that it is possible, for control purposes, to obtain a useful boiler model from input-output data records of short length using the statistical identification approach. The methodology developed is equally applicable for identifying models for other processes.