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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    Ventilation System Modelling and Turbulence Minimisation
    (Word Scientific Connect, 2014) WHALLEY, R.; ABDUL-AMEER, A.
    In this feasibility study, a large scale ventilation system comprising spatially dispersed enclosed volumes, fans, ducting and airways is considered. Analytical procedures enabling the construction of simple, compact models including the relatively pointwise and significantly distributed system elements are proposed. Modeling accuracy, with the incorporation of the entrance and exit impedances and the airway, continuous energy storage and dissipation effects are emphasized. Output flow maximization, under quiescent operating conditions is investigated and the optimum relationships between the airway characteristic impedance, entrance and exit resistances are established. The minimization of the vibration and turbulence arising from the continuous compression/expansion effects arising from the input–output volume airflow difference is achieved, whilst simultaneously maximizing the output volume airflow. Variations in the parameter values are employed to confirm the effectiveness of operating under optimum conditions, for ventilation system airways with various dimensions and characteristics.
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    Drill String Modeling and Stress Analysis
    (2012) Abdul-Ameer, A.
    The unsupported deflection of drill strings which are subjected to increasing gravitational loading and distortion, with borehole depth and twisting, is considered. Eccentric loading configurations which include the lateral reaction to mud flow pressure, compression, bending forces and twisting moments are incorporated in the derivations. The bending- buckling deflections and twist angle dynamics following drill string drive motor voltage changes are provided. The principal stress level is identified when operating at particular borehole depths and with specified cutting velocities.
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    Hybrid Modelling of Machine Tool Drives
    (Elsevier, 2005) Whalley, R.; Ebrahimi, M.; A. Abdul-Ameer, A.
    The x-axis dynamics of a milling machine where the workpiece and saddle are mounted on supporting slides is considered. A permanent magnet motor, lead screw, ball nut and bearings are employed as the machine, traverse actuator mechanism. Hybrid, distributed–lumped parameter methods are used to model the machine tool x-axis drive system. Inclusion of the spatial configuration of the drive generates the incident, travelling and reflected vibration signature of the system. Lead screw interactive torsion and tension loading, which is excited by cutting and input disturbance conditions, is incorporated in the modelling process. Measured and results from simulation exercises are presented in comparative studies enabling the dynamic characteristics of the machine to be identified under, no load and with the application of cyclic, cutting force disturbances. The effect of the lead screw length, cutting speed and hence the load disturbance frequency are examined and the resulting performance accuracy is commented upon.
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    The dynamic modelling and simulation of cutting processes in turning
    (Researchgate, 2004) Moughith, W.S.E.; Abdul-Ameer, A.A.; Khanipour, Ahmad
    A dynamic model of a lathe machine and cutting process is presented for condition monitoring purpose. The model presented permits a better understanding of the cutting process and its interaction with the machine tool, and this can be used as a part of a model based fault diagnose system.
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    Modelling and simulation of turning processes
    (Researchgate, 2003) Abdul-Ameer, A.A.; Farshidianfar, A.; Ebrahimi, M K
    A block-diagram model of the cutting process in the turning operation has been developed through an analytical approach in order to predict the cutting forces. This gives a fundamental idea about cutting forces acting on the axis-drive and spindle-drive systems that can be used in machine tool virtual prototyping. The aim of this paper is to analyse the process in physical terms and hence to develop a cutting process model that relates the feed rate and spindle speed to the cutting forces generated. The model presented here permits a better understanding of the cutting process and its interaction with the machine tool, and can be used as a part of an integrated computer-aided engineering design tool. Model parameters were measured experimentally so that the model can be simulated. The results of the simulation were compared with data obtained during cutting operations.