DEPARTMENT OF MECHANICAL ENGINEERING

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Author: search.filters.author.Adetunji, A. R.

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    Taguchi optimization of process parameters on the hardness and impact energy of aluminium alloy sand castings
    (2013) Oji, J. O.; Sunday, P. H.; Petinrin, O. M.; Adetunji, A. R.
    An optimization technique for sand casting process parameters based on the Taguchi method is reported in this paper. While keeping other casting parameters constant, aluminium alloy castings were prepared by sand casting technique using three different parameters, namely the mould temperature, pouring temperature and runner size. Hardness and impact energy tests were done for the resulted castings. The settings of parameters were determined by using the Taguchi experimental design method. The level of importance of the parameters on the hardness impact energy was determined using the analysis of variance (ANOVA). The optimum parameter combination was obtained by using the analysis of signal-to-noise (S/N) ratio. Analysis of the results shows that 100°C mould temperature and 700°C pouring temperatures are optimal values for hardness and impact energy. However 200 mm2 and 285 mm2 runner sizes are the optimal values for hardness and impact energy respectively. The mould temperature was the most influential parameter on the hardness impact energy of the castings.
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    Utilization of solar energy for power generation in Nigeria
    (2012) Oji, J. O.; Idusuyi, N.; Aliu, T. O.; Petinrin, M. O.; Odejobi, O. A.; Adetunji, A. R.
    This study presents the viabilities for power generation in Nigeria through the utilization of the sun’s energy. Solar-thermal and photovoltaic options were discussed. It highlights the basic science for the design and selection of com-ponents for successfully harnessing solar power. Requirements for solar panel placement and orientation were also high-lighted. It emphasizes that the knowledge and experience gained in solar energy as an abundant and convenient energy source, can play a role in steering the nation toward a permanent and sustainable development. The energy demand in Nigeria far outweighs the supply which is epileptic in nature. The acute electricity supply hinders the country’s develop-ment notwithstanding the availability of vast natural resources in the country. Our ability to continue the trend for afford-able energy will be severely tested in the coming decades, as evidenced by the widening trade imbalance, collapse of big manufacturing companies, sharp increase in the cost of doing business just to mention but a few. It is the issue of utilizing the sun’s silent, inexhaustible, and non-polluting resource for power generation in Nigeria that this work addresses; hence it is the long-range review of the energy problem.