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Articles by A. Zainuddin
Total Records ( 3 ) for A. Zainuddin
  A. Mouangue Nanimina , A.M. Abdul-Rani , F. Ahmad , A. Zainuddin and S.H. Jason Lo
  Aluminium Metal Matrix Composites (AMMCs) are making inroads in various engineering applications requiring higher strength and stiffness than those offered by conventional aluminium alloys. Traditional machining of AMMCs however is difficult due to the hard reinforcement present in the AMMC material which tends to wrap around the cutting tool-bit leading to tool breakage. Electro-Discharge Machining (EDM) has been successfully applied on standard aluminium alloy such as Al 6061 but yet to be tested on 30% (by volume) Al2O3 reinforced AMMC. In this study, specific machining performance characteristics on AMMC reinforced with 30 % Al2O3 is assessed in comparison with Al 6061. The characteristics under study are Material Removal Rate (MRR) and Tool Wear Ratio (TWR). Key process parameters such as the peak current, pulse and pause durations (ON-time and OFF-time), were varied to determine their influences on the MRR and TWR of 30% Al2O3 reinforced AMMC. Results indicate that 30% Al2O3 reinforced aluminium metal matrix composite can be machined using EDM to obtain acceptable result in terms of MRR and TWR. A high value of peak current and ON-time increase rapidly MRR of Al 6061 rather than AMMC while it decreases with increasing of OFF-time. Tool wears more at low peak current and ON-time than OFF-time.
  I. Ibrahim , K.A.Z. Abidin , A. Zainuddin and T.N.A.T. Kamaruddin
  The overall diesel engine performance is very much dependent upon the design and operation parameters of the inlet and exhaust system. This study was undertaken to provide knowledge for improving the diesel engine performance through modification of the exhaust middle pipe configuration. This study presents the results of an experimental study of the exhaust middle pipe on diesel engine performance in terms of torque produced, brake horsepower, Brake Mean Effective Pressure and the specific fuel consumption. Experimental study is adopted in this study based on two conditions, at 50% throttle opening and 100% throttle opening conditions. The experiment was conducted on a four stroke, four cylinders, in-line OHC and indirect injection diesel engine with different exhaust middle pipe configuration attached. The results of the physical testing shows the differences in engine performance for different exhaust middle pipe configurations especially at the engine speed greater than 2000 rpm.
  M. Amin A. Majid , A. Zainuddin and A.L. Tamiru
  Performance analysis, optimization and environmental load assessment of an absorption system requires accurate but simplified models. The objective of the present study is to develop such models based on non-dimensional parameters (part load ratio, part-load factor and diverter damper position) and ordinary least squares. Since for the case study, the hourly, daily and monthly load demands data are available, the method of averaging over eight years is considered. The models are developed for a system comprised of two heat recovery steam generators and two steam absorption chillers. It was observed that the proposed method is effective in providing better picture of the relationships between the supplied heat and the amount of energy recovered by each subsystem. The maximum cooling load experienced by the two chillers was about 2392RT, which is 4.32% lower than the design capacity. The steam generators were found operating at part load ratio of about 0.41 only. Both chillers deteriorated in performance within the study period. This was confirmed by the part load ratio of 0.8 and steam consumption higher than that required for a new chiller. A generalized model was also identified for the two chillers with the correlation coefficient (R2), chi-square (χ2) and Root Mean Squared Error (RMSE) equals to 0.9996, 1.9765e-5 and 0.0044, respectively. The model was found accurate for cooling water temperatures in the range of 29 to 32°C.
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