scholarly works
Permanent URI for this collectionhttps://repository.ui.edu.ng/handle/123456789/477
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Item 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.Item The effect of tribological processes on productivity: a case study of industries in Ibadan metropolis of Nigeria(2009-05) Simolowo, O. E.; Adeniji, O. O.This study analyzed the connection between tribological and other forms of processes in manufacturing industries to productivity in such outfits. Results from the study showed that 54% of the visited industries recorded the highest hours of downtime due to tribological processes, while,15% and 31% of the industries had the highest downtimes hours resulting from electrical and other processes respectively. Also 23% of the total industries were observed to have more electrical faults, 31% recorded highest tribological issues, while 46% had more of non-tribological non-electrical faults.Item Profile simulation software for trigonometric and polynomial cams design(2007) Simolowo, O. E.; Bamiro, O. A.This paper discusses the development of unique software for the design of various cam profiles for the plate cam operating a flat face follower. The method employed in this work is that of generating geometrical cam coordinates using standard cam motions, thereby avoiding the problem of undercutting resulting from graphical layout methds for similar cam and follower types. Determination of critical design output parameters were carried out by the developed software computational algorigthm. The software was validated by using it to simulate a number of standard cases. For the standard case having the follower profile Dwell(200o)-Rise (280o)-Dwell(300o)-Return(360o)and performing cycloid rise and return motion, the prime circle radius for the cam profile and face width of the follower were calculated as 55.72mm and 33.76mm while the maximum and minimum follower velocities were 13.70mm/rad and -10.27mm/rad respectively. These values, as well as those obtained for other standard cases simulated, were found to be in agreement with earlier works done in this area of researchItem Roller-cam systems design: development of a profile analysis software(2009-05) Simolowo, O. E.; Bamiro, O. E.The different options involved in cam systems design such as types of cams and followers, number of applicable standard cam functions, divisions of follower motion-segments, and possible combinations of follower displacement profiles, among others, were critically studied to determine the structure and capabilities of a software package suited for extensive design analyses. The software was applied in the design of cam profiles with selected follower and cam functions and the results obtained were found comparable with those obtained from numerical methods and existing software packages.Item The development of an analyses-intensive software for improved cams systems design(2008-04) Simolowo, O. E.; Bamiro, O. A.The computer-aided software developed in this research work is used in designing cam systems by generating various follower motions and cam profiles. It is highly suited for extensive dynamics, kinematics and geometric design analysis based on some inherent features that are unique. The plate cam with either flat-face or roller followers can be designed. Most of the standard and acceptable cam functions are included such as double harmonic, modified trapezoidal, cycloid, 4-5-6 polynomial and others. Various prime circle radii and follower face widths are calculated for flat-face follower design option for any user selected cam angle, follower profile and cam function. Other parameters such as minimum and maximum values of radii of curvature, pressure angle, are also calculated for roller follower design option. In every design the follower motion and cam profiles are calculated and coordinate files can be exported in Cartesian format and automatically imported into a spreadsheet package thereby using all its features for better analysis of results. All dynamic, kinematics and geometric parameters can be plotted and all data may be printed to the screen, to a printer, or to a file.Item 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. "Item Performance analysis of a modified pneumatic separator for cowpeas(2007-12) Simolowo, O. E.; Araromi, O. T.; Adesanya, O. O.In this work, modifications have been done on a prototype pneumatic separator to improve its efficiency. The effects of the modifications were studied by carrying out performance test analyses on the two blowers and reciprocating sieve mechanism which make up the critical components of the separating machine. The variations in the feed weights of the sieve were analyzed to determine the best and most effective screening process. Also, the best and least tilt angles of the blowers were considered to determine the best and least blowing processes to clean the beans. The results of analyses showed that for a feed weight of 3.0kg the sieving process attained its best efficiency of 50.2%. The maximum efficiency of 79.2% for the first pneumatic separator was obtained at a tilt angle of 30°, while a maximum of 77.7% was obtained for the second separator at 0° tilt angle. An overall efficiency of 77% was estimated for the modified pneumatic separator.Item 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/sItem 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.