BSpace

The British University in Dubai (BUiD) Digital Repository

Welcome to BSpace, the online institutional repository of the British University in Dubai. BSpace provides access to the Dissertations, Thesis, Research projects, Faculty publications and archives of BUiD.

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Recent Submissions

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    Gas pipeline modelling and control
    (Sage Journals, 2015) Whalley, R; Abdul-Ameer, A
    The distributed parameter modelling of the gas flow through long pipelines is considered. Procedures which incorporate the gas stream energy storage, the pipeline frictional resistance and pressure attenuation characteristics are introduced. The pipeline input–output, transfer function, pressure and volume flow representations are formulated. An optimum, least effort, closed loop regulation strategy is proposed. Frequency response techniques are invoked enabling the derivation of simple, robust control algorithms. Confirmation of the results obtained, from the transient response computation of the outputs following input reference and load disturbance changes, are presented. The accuracy and novelty of the approach presented is commented upon.
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    Machinery Drives and Dynamic Stresses
    (semantic scholar, 2014) Abdul-Ameer, A.
    Distributed-lumped parameter modelling methods are employed in the analysis of manufacturing machine drives comprising rotors, bearings and shaft arrangements for variable speed process systems. Analysis procedures enabling the computation of the torsional shear stress and velocity response of these systems are outlined and block diagram representations are formulated. The dynamic stresses for machine drive arrangements following deterministic input changes are computed. Typical rotor-shaft assemblies are investigated illustrating the peak stress levels encountered
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    Energy Efficient Gas Pipeline Transportation
    (Researchgate, 2014) Whalley, R.; Abdul-Ameer, A.
    Gas transportation via long pipelines is considered. Distributed parameter, dynamic modelling with series and shunt energy dissipation and gas stream, equivalent capacitance and inductance effects are proposed. Hybrid analysis techniques, wherein both the distributed and the lumped, concentrated elements of the pipeline system are included in the overall model, are advocated. Constrained optimisation procedures, with the introduction of the Hamiltonian function to minimise the pipeline, inflow–outflow difference, are invoked thereby promoting impedance matching and the energy-efficient transportation of the specified, gas volume flow rate. Illustrative application studies are outlined thereby validating the analytical methods employed and the determination of the optimum, pipeline exit resistance.
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    Winder Control Using a Ward-Leonard System
    (Inderscience, 2010) Whalley, Robert; Abdul-Ameer, Alaa; Ebrahimi, M.; Nikranjbar, Abolfath
    An electrically driven winder for a deep shaft mine is considered. The system comprises a two stage Ward-Leonard motor-generator set, a winding drum, head and reduction gear and a braking unit, for which a linear model is derived. A minimum control effort regulation strategy is proposed enabling the simultaneous regulation of the motor speed and armature current. The computed responses for the system are presented for open and closed loop conditions. The effectiveness of the system when following particular, demanded speed requirements is investigated. The control energy dissipation and regenerative braking performance of the system are commented upon.
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    The Computation of Torsional, Dynamic Stresses
    (2009) Whalley, R; Abdul-Ameer, A
    : The torsional dynamics of spatially dispersed, mechanical, power transmission sys tem models are considered. Distributed–lumped parameter modelling methods are employed in the analysis of configurations comprising rotors, bearings, and relatively slender shaft arrange ments. Analysis procedures enabling the computation of the torsional shear stress and velocity response of these drive systems are outlined and block diagram representations are formulated. The transient characteristics for shaft–rotor arrangements following deterministic input changes are computed. Typical rotor–shaft assemblies are investigated, illustrating thereby the proce dures involved. Graphical results and comparative studies are presented and the generality of the techniques detailed is commented upon.