DEPARTMENT OF MECHANICAL ENGINEERING

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Effects of temper annealing temperatures and times on the mechanical properties of cold-worked aluminium 1200
(1989-04) Aderibigbe, D. A.; Sowole, O.O.
Experiments have been conducted to develop temper- annealing schedule for continusly cast and cold-worked aluminium 1200. By using the method of graphical combination of the results of tensile and deep- drawn test, it is shown that a cost-effective temper-annealing schedule that would impart improved mechanical properties( compared with full annealing at 460° C for 6 hours) can be developed for Al-1200. For optimum combination of desired properties during deep- drawing, the 75% cold-worked material should be temper-annealed at 380 °C for 3 hours; the 85% cold-worked material should be temper-annealed at 400 C for 2 hours while the 90% cold-worked Al-1200 should be temper-annealed at 460 °C for 3 hours
Prospects for software development for indigenous designs
(NEC Publication, 1998) Simolowo, O. E.
The importance of software development in the world today cannot be over-emphasized, moreso as applied in the field of engineering. Software development for indigenous engineering design needs to be given peculiar considerations as it entails developing software from the basics (high level language) for it to handle target indigenous design specifications. This paper therefore in its focus starts from the central point of all computed aided engineering activities called the “ database”. The database discussed entails (i)Documentation(ii)synthesis and analysis. Tools for software development such as computer languages and hardware configurations available within the country for indigenous software development have also been considered. Common computer language modes and their functions as well as practical techniques of packaging developed software have also been outlined. The design chart of the software for generation of Cam profiles developed in a research work (CAD of CAM profiles) based on the application of procedures discussed in this paper is shown as reference figure. Majority, research work in this area will alleviate the problem of much dependence on imported software whose applications are limited as regards local design and also not fully utilized due to the understanding of the software flexibility and capabilities by unskilled users.
Ceramic engines: material properties for higher performance
(1998) Simolowo, O. E.
The four-stroke reciprocating internal combustion engine has been used as a case study, being that commonly utilized in most automobiles. General properties of ceramics were discussed while exposure was given to some high-performance ceramics. Theoretical deduction and analysis were then carried out to show improved engine performance using ceramic component. the engine performance parameter considered are:(i)power output (ii) mean effective pressure(iii) speed of engine rotation and (iv) mechanical efficiency. analysis based on ceramic properties showed that ceramics such as silicon carbide (SiC), silicon nitride(Si3N4), zirconia (ZrO2) and , titanium oxide (TiO2) proved to have more favourable properties for most engine parts when subjected to engine conditions where they are located as compared to their metallic, steel and alloy counterparts. Though much work has been done in the production of ceramic engines, predictions as to developing (i) adiabatic ceremic engines and (ii) turbo compounded engine show the extent to work that still needs to be done in this area of developing ceramic engines.
Design and construction of a plastic melting pot for low density polyethylene (LDPE)
(1999) Odesola, I. F.; Bomide, A. K.
In this project a melting pot was designed and constructed using available local materials. This pot was used to melt plastic resin without the resin-changing colour (turning brown). The project was divided into two parts: the design and construction aspect and the control aspect. A good temperature control was incorporated to achieve high quality output. The construction was carried out using galvanized mild steel. In this project a melting pot was designed and constructed using available local materials. This pot was used to melt plastic resin without the resin-changing colour (turning brown). The project was divided into two parts: the design and construction aspect and the control aspect. A good temperature control was incorporated to achieve high quality output. The construction was carried out using galvanized mild steel. It consists of a cylindrical enclosure that is divided into two chambers: the upper and larger one house the melting unit, the lower chamber houses sensing element of the temperature control equipment. The instrument used for the temperature control is a thermostat which has a temperature range of 0-200°. The dimension of the material used for the fabrication was based on the least thermal difference so that equilibrium can be achieved in a short time .Tests carried out after the construction of the prototype confirmed the relevancy of the project. The pot melted the plastic resin and flowed without change of colour.
Organic fertilizer use in Nigeria: our experience
(Department of Agronomy, Univeristy of Ibadan, 2000) Omueti, J. A. I.; Sridhar, M. K. C.||Adeoye, G. O.||Bamiro, O.||Fadare, D. A.; Adeoye, G. O.; Bamiro, O.; Fadare, D. A.
Impact of technology (engineering) on business operations in Nigeria (1960-1998)
(2000) Odesola, I. F.
Despite the low-level of Technological inputs and assimilation in Nigeria in general, Business operations have benefited considerably from Technology. Technology input have been in form of vastly improved communications, power availability, distribution, new tools of machinery for production, and health facilities. In this paper, the situation of Transportation and Food industries are focused on in respect of great changes that have taken place therein. Suggestion on the practical way of having greater progress are listed to serve as guides for policy makers in the country.
Effect of heat treatment on the damage ratio of corroded ST 60 MN steel
(2001) Oluwole, O. O.
In this work, the effect of various heat treatments on ST 60Mn steel on its fatigue strength prior to use and after use studied. It was observed that by nomalising for service conditions not exceeding 106 stress cycles, the fatigue stregnth was raised by a factor of 1.2
Computer simulation of air-conditioning system design and ducting analysis for professionals and engineering students
(2001-11) Odesola, I. F.; Ogunfolu, O.
Air-conditioning system design and ducting analysis has over the years been an aspect of Engineering, which even though has developed greatly, yet it brings about very tedious tasks of analysis, low level of accuracy, and a lot of time input in carrying out its analysis manually. This work makes provision for the use of a software package, designed for ducting analysis. It has the capability of handling analysis for buildings having as much as nine (9) floors, with each floor having up to twenty (20) rooms. The report gives an account of the method used and the programming aspect of the package for ducting analysis. The thermal analysis of a building forms the basis for the equipment selection in terms of capacity of the cooling equipment, quantity of dehumidified air required and the type of system to be recommended. The estimated air quantity is then used in carrying out the analysis of the system. The package has been designed in such a way that results of analysis made could be printed out for use. Also, it can be easily used on any computer that has a floppy drive for its installation, and has been produced using Visual Basic 6.0. it would be very useful for professionals, as it can carry out analysis which might take hours to develop in few seconds, and also, can be used in higher institutions as teaching aid to INSTRUCT Engineering students.
Performance evaluation of a gas (butane) fired oven
(2001-11) Odesola, I. F.; Akinlade, D. O.; Fayemi, B. O.
A gas-fired oven for commercial production of bread was designed and constructed using locally available material and was subjected to various tests to come out with its performance characteristics. Its performance was evaluated arid then compared with respect to the total time required to bake a specified mass of white flour dough using the gas oven with that used by clay wood fired oven for the same mass of white flour dough. The outcome of the test result indicated that the maximum temperature attained by the oven was 400°C with the gas control valves at close to the maximum point (without load). This temperature was attained seven minutes after firing the oven. The clay wood fired oven tested attained a peak temperature of 280°C one hour after it was fired. White flour dough of mass 0.2kg was baked in the gas fired oven in thirty nine minutes (first load), this corresponds to the total baking time. The same unit mass of dough was baked in the wood fired oven in a total baking time of eight-five minutes. A test carried out on the insulating machine, sawdust, showed that it minimized the heat loss from the oven by maintaining a high temperature gradient between the inside wall and the outer wall of the oven. The preliminary economic analysis of the cost of production of the oven and the cost of fuel showed that is cost effective and viable.
A technical and economic evaluation of the electricity generation and distribution system in Nigeria
(2002) Diji, C. J.
Electricity is one form of energy . It occupies a special place in our civilization, because it is easier to use than many other types. It is clean, versatile and can be transported over long distances almost instantly. These factors account for why electricity has grown faster than other forms of energy and why this growth is' expected to continue. Electricity generation and distribution in Nigeria is a business of government and government vested that sole responsibility to the National Electric Power Authority (NEPA). Almost 30yrs of its existence, NEPA has not been able to meet the electricity needs for residential, commercial and industrial use. This paper is an exploratory appraisal of the economic and technical factors that has been responsible for the inability of NEPA to fulfil its statutory responsibility. The paper ,asserts that if the issues of electricity demand' and supply, electricity tariffs, choice of technology for power generation and the efficiency of the electricity distribution networks are not addressed, the adequate supply of electricity in Nigeria will continue to be a mirage.
Performance evaluation of a locally fabricated crusher (hammer mill)
(2002) Odesola, I. F.; Olamide, O. O.; Sanni, W. A.
A bone-crusher (Hammer Mill) was designed, constructed and tested. The machine was designed to crush 1000kg of bones in one hour. The motor operating speed employed is 2920rpm, the sieve hole diameters are 7mm and 5mm while the numbers of hammers are 12 and 18 pieces. The performance tests show that the mill is capable of crushing between 860 to 1170kg within an hour.
The design of Ogi sieving machine.
(2002) Simolowo, O. E.; Ndukwe, C. C.
In an attempt to ease the processing of Ogi (ground soaked corn in slurry form) a major staple food in Nigeria, especially among infants and thereby increase the rate of its consumption the manual process of sieving. Ogi has been studied and a new technological method has been developed to improve the sieving process of ogi. The mechanization of the ogi sieving process involves the design of a simple machine which operates based on theprinciple of suction pressure to achieve solid-iiquid separation of the Ogi mixture. The Ogi sieving machine has been designed and assembled in three stages to improve performance of the equipment Performance tests carried out on the machine designed show that the machine has a sieving flow rate of 11.1*10-5m3/s as compared with manual sieving flow rate of 3.02 *10 -5 m3/s
Modelling of sintering behaviour of Al-49.6wt%Zn powder compacts
(2002) Oluwole, O. O; Obafemi, O. K.
Al-Zn alloys find commercial use in aircrafts and cars. During multiphase sintering of powders, dimentional changes take place. It is necessary to accurately predict what dimentional changes will occur so that post sintering operatings will take care of this change. The sintering behaviour of Al-49.6wt% Zn powder compacts has been studied. Mathematical models for the effect of pressure and temperature on dimensional changes during sintering were obtained. Sintering temperature was kept constant at 435oC.Powder compact size was also kept constant.It was observed that, at a compacting pressure of 288Mpa there was zero shrinkage after 6 minutes of sintering at 435oC. With compacting pressure less than 288MPa and sintering for 150minutes, there was no single pressure where both diametric and longitudinal shrinkage was zero. It was only possible to keep the longitudinal and diametric shrinkage as low as possible(0.35%) at a compacting pressure of 205MPa. This shows that it is possible to have no shrinkage in the sintering operation of AL-49.6wt%Zn powder compacts which implies that no post sintering operation is neccessary if dimensional accuracies are required.
Texture and structure of cold-rolled and temper annealed sheet of aluminium 1200
(2002) Oluwole, O.O; Ajayi, J. A.; Olorunniwo, O. E; |Sofoluwe, O.
Aluminium 1200 is the grade of aluminium used for hollowares. It is the good corrosion resistance and ductility of Aluminium 1200 that made it particularly suitable for hollowares. However, there is a need to control the texture of aluminium sheet to be cold rolled in order to obtained optimal condition favourable for metal drawing. This is the rationale for this work. The effect of annealing and cold rolling on texture and struture of Aluminium 1200 sheets has been established. Working on cold rolled reductions of 80%, 84%, 86, 88%, and 92% and annealing temperature of 350C, 400C and 480 C, for 1hrs and 3hrs, Planar and normal anisotropy (that is, measure of crystallographic texture) were calculated from a known relationship. Samples of 80% cold-rolled reduction and heated to temperature 35C for three (3) hours showed the most favourable texture for metal drawing. Thus, crystallographic texture has been found to be determined by the average normal and planar anisotropy of Aluminium 1200 sheet metal which can be controlled by the annealing temperature and degree of previous cold- working. Texture with very low value of average anisotropy (about unity) has been found suitable for aluminium 1200 metal sheet drawing. Although annealing is observed to enhance the preferred orientation for metal drawing, there is the need to control the grain growth associated with it, which can impair the mechanical properties of the sheet.
Finite element analysis of a transient 2-dimensional heat conduction problem
(2002) Odesola, I. F.; Adeogun, S. A.
The analysis of a transient 2-Dimensional heat conduction problem by the Finite Element Method is hereby presented. The solution approach was that of partial discretisation : 4-node isoparametric elements were used in the discretisation of the problem domain in the spatial coordinate, while linear temporal elements are used in the discretisation of the time domain. The Galerkin's Weighted Residual Method was used in the development of the system equation in the space domain, and their transformation into the time domain. The resulting system of equation, which is a two-point recursive relation,was solved using the Gauss - Cholesky Method. The developed algorithm was used on a linear, transient 2-Dimensional problem, and the results obtained were an improvement on those obtained by Bruch, J. C . and Zyvoloski , G.
Duct design and performance: a case study of a University senate chamber
(2002) Odesola, I. F.; Ndubuisi, C. U.; Ogbolu, N. D.
This paper present the design of a central air-conditioning /ducting system for a case study of a University Senate Chamber in Nigeria. The design aims at maintaining conditions that are conducive to human comfort within the senate chamber of the University. (24°C - 25.5°C, 50% - 55% RH). The design month was March (6) and using the expert assistance found in the carrier system design ducting analysis manual the refrigeration tonnage obtained was 40 and the total air quantity required to remove the heat load was 9908cfm. Low velocity with equal friction method was used in the ducting analysis. Equipment selection was carried out for the proposed system. A simulation was carried on the proposed system to estimate the relative humidity and temperature at various times. Another test was carried out on the actual (existing unit) to estimate relative humidity and temperature at various times and positions within the chamber. A comparison of the simulated and tested values with standard comfort conditions reveals that the new design will certainly give more comfort.
Electricity demand and consumption in a manufacturing industry
(2002-02) Diji, C. J.; Okiwelu, A. A.
Industrialization the world over owes its growth to the discovery of electricity. Most machines and plants are driven by electric motors; residential and industrial lighting is predominantly electrical; and the communication and entertainment industry are largely dependent 011 electricity. This paper is an analysis of the demand and consumption pattern of electricity in a manufacturing industry in Ibadan. Based on the supply pattern of the electricity to meet the needs of the organization; the paper concludes that there is a need to improve electricity supply to tile manufacturing industry to cut down its production cost which has been on the increase due to energy as one of its prime causes.
Effect of desing parameters on CAM profiles
(2003) Simolowo, O. E.; Udoh, E. A.
"In the process of generating a cam profile, input parameters such as lift maximum allowable pressure angle, eccentricity and roller radius are subjected to variations. These variations are done in order to arrive at optimum output design parameters, cam profiles and ultimately optimum cam design. A computer aided analysis of cam profiles with eight - order - polynomial motion using a roller follower and having a Dwell- Rise - Return. displacement profile has therefore being carried out in this work. The analysis, in a similar procedure, is also applicable to cam profiles with different standard cam motions, followers, displacement profiles and cam angles. The followers lift, maximum allowable pressure angle, eccentricity and roller radius were varied within and outside design limits and their effects ana lysed on the generated cam profiles and other design parameters. Optimum values for the parameters considered were obtained from the result of the variation analysis, while characteristic changes were also observed from the generated cam profiles. "
Rehabilitation of pumps: case study of universal pump set
(2003-04) Odesola, I. F.; Ehinmowo, A. A.
Laboratory equipment is meant to impart some modules of knowledge unto students of engineering and applied sciences. In other words they are to bridge the gap between theory in the classroom and practical on the field. When there is no sufficient fund to keep this equipment in good condition other avenues must be looked into to avert the dangers of training Engineers and Technicians without the necessary exposure to Laboratory practicals. Equipment worth millions of Naira are lying waste in many institutions of higher learning because nobody cared to take the bull by the horns. The purpose of this project is to rehabilitate laboratory equipment that had been abandoned for many years due to malfunctioning of one or two components. The approach adopted here was to find out the root cause of the problem and proffered a solution. This was done in the case of Universal Water Pump Set located in the fluid laboratory of Mechanical Engineering Department, University of Ibadan, Ibadan. The rig was tested after the repair and maintenance exercises were carried out. The results of performance characteristics carried out on the equipment confirmed that it has been brought back to life. Two laboratory exercises were prepared for each pump to be used by the students as from the next session. The total cost of rehabilitation excluding labour was N1700.00.
A PC- based simulation package for engineering students and professionals on compressible flow
(2003-04) Odesola, I. F.; Bamiro, D.
Both Engineering students and practicing Engineers are involved in the design and analysis associated with fluid mechanics and thermo-dynamics problems. For them to be very efficient and proficient in handling various problems there is need for scientific data and general information in forms of tables or graphs. These must be made available in a compact form. In this paper a successful attempt was made to make available this aforementioned data in respect of compressible flow. All the equations concerned are brought together in a simplified form and programmed to generate useful data for various gases of interest on compressible flows. Analysis of compressible fluid flow becomes very easy if one has access to information as presented in this paper.