ABSTRACT This study investigates various insulation thicknesses requirements for double-walled spherical pressure vessels for the storage of cryogenic liquids. The inner tank is suspended from the outer tank by straps or cables and the annular space between the tanks is filled with insulation. The outer tank is not subjected to the freezing temperatures and is thus assumed to be a standard carbon steel sphere. In the Finite Element Analysis model of the system, one dimensional analysis was e...
ABSTRACT This paper investigate some important works done on numerical analysis and modeling of laminar flow in pipes. This review is focused on some methods of approach and the analytical tools used in analyzing of the important parameters to be considered in laminar flow; such as frictional losses, heat transfer etc. in laminar flow in pipes of different shapes, and the importance of laminar flow in its areas of applications. Prominent researchers have approached this from different perspe...
Abstract Upper bound solutions to a 4-High reversing aluminium cold-rolling sheet mill was obtained in this work using both analytical and graphical methods. The upper bound method was applied to the rolling of an Al 1200 sheet from 7mm to 0.6mm in six passes. It was observed that both methods were very effective in predicting upper bound load value with the graphical method giving a higher value using input velocity values from industry. However, it was observed that the graphical method be...
ABSTRACT Most Finite Element Analysts in Nigeria develop own codes for their analysis due to inability to purchase commercial finite element analysis software packages that GUI geometric modelers and difficulty in managing coordinate data from imported CAD files.
ABSTRACT The fact that the drive parameters space of harmonically excited pendulum consist of mix parameters combination leading to different dynamics phenomena including chaotic and periodic responses is a strong motivation for this study aim at estimating the peak frequency that favour chaotic response
Abstract The contribution of this paper to traffic engineering is the application of Laplace Transform to the quantification of speed control in the modelling of road bumps with hollow rectangular shape. The paper simulates the behaviour of a vehicle when passing over a series of bumps. In many countries the current practice used for lowering the vehicle speed is to raise road bumps above the road surface. If a hollow bump is used it may be economical and offers other advantages over road bu...
ABSTRACT An electricity audit of a building is the process whereby an energy manager survey and analyzes how energy is used in the building with the main objective of identifying opportunities for reducing the amount of energy used and ensuring that available energy is used efficiently.
INTRODUCTION In the recent times, the application of interactive software algorithms have made tremendous impact in the field of technology and engineering, various computer-aided methods are now used in virtually dl its aspects of human endeavour. This work is on the development of a software algorithm to model and forecast energy Loads with a possible choice of three different forecasting models. The developed software does not only remove the medium associated with Energy modeling and fore...
abstract Modelling and prediction of wind speed are essential prerequisites in the sitting and sizing of wind power applications. The profile of wind speed in Nigeria is modelled using artificial neural network (ANN). The ANN model consists of 3-layered, feed-forward, back-propagation network with different configurations, designed using the Neural Toolbox for MATLAB. The monthly mean daily wind speed data monitored at 10 m above ground level for a period of 20 years (1983–2003) for 28 grou...
ABSTRACT Boundaries of six selected countries one from each continent were studied, using fractal dimension technique. The Area – Perimeter relation method was used, where land area covered and boundary length of designated countries were measured in the unit of known box size (Box counting). The loglog plots of these variables were obtained and the slopes were measured as the required dimensions. Fractal dimensions determined lie between 1.19 and 1.55. The scale size of the maps, and the n...
ABSTRACT Engineering research is a sine-qua-non for development of new products, new production processes, hence production lines in the quest for self reliance in any economy. Modeling and simulation is a veritable tool for such research and development. This paper presents the multifaceted use of modeling and simulation as decision tools for engineering facet of an economy drawing examples from two different engineering disciplines- Metallurgical and Civil.
ABSTRACT In this study, the short-term load pattern for the University of Ibadan was investigated and a multilayered feed-forward artificial neural networks (ANN) model was developed to forecast the time series half-hourly load pattern of the system using the load data for a period of 5 years (2000 to 2004). The study showed that the mean half hourly load for the period of study ranged between 1.3 and 2.2 MW, and the coefficient of determination (R2 -values) of the ANN predicted and the measu...
ABSTRACT Commercial act~vated carbons are produced from bituminous and lignite coal. The environmental impacts and potentially increasing cost of coal has encouraged the search for other alternatives in agricultural wastes. The objectives of this study were to develop process flow diagrams for the large scale production of activated carbon from three agricultural wastes namely: coconut shells, oil-palm shells, and sugarcane bagasse as well as carrying out an economic evaluation to estimate th...
ABSTRACT This study explores the potentiality of decimal digits distribution to differentiate between chaotic and random numbers. Ten thousand (10000) random and chaotic numbers each were generated using computer inbuilt random number generator and Logistic equation respectively. The random and chaotic numbers were obtained using FORTRAN codes. Logistic equation was solved for only parameters (Ks7) known to exhibit chaotic behaviour with initial value of 0.3 for all cases. Graphs of decimal d...
ABSTRACT Modeled grain structures of normalized carbon steels using voronoi tessellation is reported in this work. Three stages of programming were used in modeling the microstructures. The first stage was iteration of the voronoi cells in order to obtain equivalent grain size with experimental specimens. In the second stage, the pearlite phase was introduced using the lever rule represented by a plot of random points. The third layer was modeled to reveal the grain boundaries of the carbon s...