Engineering

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Now showing 1 - 10 of 14


  • (2003) Ong, Siew Siew
    Thesis

  • (2003) Weerasekera, Nilushani Pavithra
    Thesis

  • (2003) Szeto, Caroline H. L.
    Thesis



  • (2003) Wu, Sue Ruihong
    Thesis

  • (2003) Ahyudanari, Ervina
    Thesis
    Check-in area is an important component of airports. All passengers, except transit passengers and remote check-in passengers, have to enter this area prior to their departure. The convenience for passengers at this area is essential in order to gain more customers using the airports. In estimating the check-in counter arrangements, this thesis introduces a method that is based on spreadsheet software packages. Two programs are developed to assist the optimization computations. The programs provide the optimum number of servers required at the airport. This will help airport management to select the number of counters at a given time. The results of the execution process of these two programs indicate the variables, such as earliness distribution, service time, queue system, and the check in counter sizes and configurations have strong influence to overall cost. A number of applications have been attempted and distribution has been explored. The results also demonstrated that under the condition imposed the multiple queue system provides less maximum queue length but longer waiting time compared to single queue system.

  • (2003) Tran, Xuan-Thien
    Thesis
    The study presents a one-dimensional, transient and compressible flow models of a commercial Common Rail Injector (CRI) and a prototype of a single-fuel Hydraulically actuated Electrically controlled Unit Injector (HEUI) developed at the University of New South Wales (UNSW) in conjunction with local industry. The unique feature of the UNSW HEUI is the fact that it uses diesel fuel as the driver for pressure amplification within the unit injector. The work undertaken is part of a wider study aimed at optimization of the design of diesel injectors for dual-fuel systems to reduce green house gas emissions. The contribution of this thesis is the development of the model of the UNSW HEUI injector, which can be used to investigate possible modifications of the injector for its use in dual-fuel injection systems. The developed models include electrical, mechanical and hydraulic subsystems present in the injectors. They are based on Kirchhoff??s laws, on the mass and momentum conservation equations and on the equilibrium of forces. The models were implemented in MATLAB/SIMULINK graphical software environment, which provides a high degree of flexibility and allows simulation of both linear and nonlinear elements. The models were used to perform sensitivity analysis of both injectors. The sensitivity analysis has revealed that the temperature of the solenoid coil is one of the critical parameters affecting the timing and the quantity of the fuel injection of both injectors. Additional critical parameters were found to be the dimensions of the piston of the CRI, the stiffness of the needle spring of the HEUI and the dimensions of the intensifier of the HEUI. The models also revealed that in the case of pilot injections the speed of the solenoid is the major limiting factor of the performance. The developed models provide better understanding of the issues and limitations of the injectors. They give detailed insight into their working principles. The investigations of the models permit making quantitative analysis of the timing of the HEUI solenoid and to evaluate the proposed change of the direction of the pressure acting on the HEUI solenoid plunger.