Mechanical Engineering
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Mechanical Engineering
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Item PERFORMANCE ASSESSMENT OF HYDROPOWER GENERATING PLANTS(International Engineering Conference (IEC), 2015) J. Y. Jiya; A. Nasir; H. U. Ogboo; A. SalihuThis paper studies the performance of ahydropower scheme in Nigeria which contributes to an acute electricity supplyand has effects on the country’s development. This does not only restrict the socioeconomic activities to basic human needs, but also adversely affecting the quality of life too.The expected full load installed capacity for the hydropower scheme is 522.74MW but the generated capacity for the period under review is 305.147MW. Only about 40% of the installed capacity was available. Average Capacity factor for this hydropower scheme is 47%, min. of 25% in 2014 and max. of 83% in 2013 as against the industrial best practice of 50 – 80%.Total generation reduction due to downtime of the hydropower scheme is 28165773MWh amounting to 53% of the total installed capacity. Based on Power generation reduction of 53% the loss of revenue in naira was about 186 Billion naira.To improve the annual power generation, a complete overhauling of all the generators and adequate water management practice must be in place so that the available water can sustain generation throughout the year.Item Tribological Properties of Canarium Schweinfurthii Shells as Frictional Materials for Automotive Brake System.(Journal of Science Technology and Education (JOSTE), 2020-12) C. S. Ibeh; J. Y. Jiya; O. Adedipe; F. J. Usman; K. T. Obanimomo; J. B. AmudaFriction material for automobile breaking system was developed using canarium schweinfurthii shell (CSS) otherwise known as African elemi. Tribological properties that direct or indirectly affect brake pad system such as thermal conductivity, water/oil absorption test, coefficient of friction, wear rate, hardness test, porosity, compressive, tensile strength, temperature, noise level generated and stopping time varying speed from 5.56 – 27.78 m/s was investigated. Experimentally developed produced brake pads using CSS were found to compete favourably with conventional brake pads and those from literature studies. The research finding using CSS indicates that CSS particle can effectively and efficiently replace asbestos in brake pad manufacturing.Item Development of a Solar Water Distiller and Laboratory Analysis of the Product(ABUAD Journal of Engineering Research and Development (AJERD), 2018) H. Adamu; O. A. Olugboji; O. Adedipe; J. Y. JiyaIn spite of the significance and availability of water, only an approximate value of about 1% is portable. Distillation processes which comprise evaporation and condensation in a box like machine called Solar Water Distiller was adopted for distilling unsafe to safe drinkable water in our homes. The design method adopted for the machine was energy method/balancing equation. The developed machine is a single stage distiller which is fabricated using local available materials. The heat energy required for powering the solar water distiller was 337.2 W/m2. This was the quantity of energy per unit time and area required for distilling the water based on average room temperature of 28.6 oC. The machine has capacity of average daily capacity of 28 litres as distillate water volume within 6.68 hours. It has design capacity of producing 4.2 litres per hour at minimum wind speed of 5.75m/s. The results show that produced machine has 75% efficiency with quality drinkable water that satisfied condition of Nigerian Standard for Drinking Water Quality NSDWQ (2007) rating.Item Prototyping of a Robotic Fire Vehicle Using Radio Frequency Technology(FUOYE Journal of Engineering and Technology,, 2019-03) O. A. Olugboji; J. Y. Jiya; I. D. OgwucheFighting a raging fire is one of the toughest uphill battles in the public – safety world. Fire fighters try to put off fires with very little information, having no idea of the size and scope of the fire nor how many potential victims may be cut off from rescue (Na Gabbert, 2012). Fire losses throughout the world remain too high and firefighting too hazardous. This work aims to mitigate these losses via the prototyping of a robotic fire vehicle using radio frequency technology. The primary research method for this study is the literature review of the various types of limitation in existing firefighting systems and models, from the review carried out an improved firefighting robotic system was designed and built. The vehicle is loaded with a water carrying bottle. Two DC motors alongside a castor wheel are used for the locomotion and drive system of the robot, a DC water pump is used to spray jets of water through its suction action. These motors are controlled from a distance over a wireless communication between the Bluetooth HC-06 and a motor control app installed on an android phone. The Robot is programmed to stop and release sprinkles of water before the robot hits the target. An Arduino microcontroller is used for the overall desired operation. The entire system is powered by a 12V Lead – acid rechargeable battery. The robot has a dimension of 0.37 m by 0.28 m by 0.12 m and navigates through a modeled floor plan with an average velocity of 0.05 m/s to extinguish a simulated fire in 5 to 10 seconds. Experimental work has been carried out carefully and successfully, the proposed technique is confirmed to be very useful for engineering, research and safety purposes.Item EVENT RECONSTRUCTION BY INVERSE METHODS(2014) O. A. Olugboji; J. Y. JiyaThis work deals with an inversion technique that was developed to reconstruct a pulse after it has propagated along a pipe; a complex pulse that is progressively distorted as explained. The technique developed makes use of the theory of inverse problemsItem Problem of calculating time delay between pulse arrivals(American Journal of Engineering Research (AJER), 2015) O. A. Olugboji; J. Y. Jiya; C. K. AjaniThis work compares the performance of four different methods of estimating the time delay between pulse arrivals at the sensors subjected to different levels of attenuation, distortion and noise. The accuracy of the calculated time between the pulse arrivals at the sensors is determined and analysed for each of the methods based on the ideal attenuation (no change in shape), ideal attenuation with added noise to the pulse signal and ideal attenuation but with distortion. Based on the analysis carried out, it is clear the cross correlation method gives the best estimate of the delay in pulse arrival times irrespective of the signal to noise ratio and so is the preferred technique used in the remainder of this research.Item Design and Construction of a Spring Stiffness Testing Machine(American Journal of Engineering Research (AJER), 2015) O. A. Olugboji; M. S. Abolarin; J. Y. Jiya; G. M. Alaya; C. K. AjaniA spring stiffness testing machine was produced which differentiates a good spring from bad one using hydraulic principle and locally sourced materials were used to produce at relative low cost and high efficiency. It also categories each spring by stiffness into one of several distinct categories based on its performance under test. This is to ensure that in the final assembly process, springs with similar performance characteristics are mated to ensure a better ride, more précised handling and improved overall vehicle or equipment performance. The construction of the machine involves basically the fabrication process which includes such operation as cutting, benching, welding, grinding, drilling, machining, casting and screw fastening. Taken into consideration under test, were types of compression springs with varying spring loading and their different displacement recorded at different pressures to compare their stiffness.Item Investigation of Mechanical Properties of Polypropylene Film as Vacuum Packaging Material for Dried Fish(Faculty of Engineering, University of Maiduguri, Maiduguri, Nigeria., 2023-09-01) I. A. Mohammed; O. Adedipe; J. Y. Jiya; A. B. Ayuba; K. T. Obanimomo; K. C. BalaThis study investigated the mechanical properties of three sets of polypropylene packaging films and existing dried fish packaging films and the quality of dried fish packaging in Nigeria... The polypropylene packaging films were produced in three batches A, B and C with thicknesses of 130μm, 150μm and 180μm respectively. The results showed that samples A, B and C had tensile strengths of 48N/mm2, 51.8N/mm2and 61N/mm2with Elongation at Break of 690.2%, 729.8% and 760% respectively. Also, the Dart Impact Strength of the samples were observed to be 191g/130μm, 208g/150μm and 231g/180μm respectively. Additionally, samples N and K (existing fish packaging films) had tensile strengths of 34.6N/mm2and 31.2N/mm2and Elongation at Break of 279.2% and 267.2% respectively. Furthermore, it was revealed that sample N exhibited better mechanical properties than sample K, while the produced polypropylene packaging films had the best mechanical properties among the samples tested. Using modern systems such as vacuum packaging and modified atmosphere packaging (MAP) techniques, fish packaging and storage was improved. This research is important in light of the significant increase in aquaculture activities in Nigeria due to increased fish production and government intervention in developing the sector, since it offers good moisture barrier properties, transparency and sealability with good cost efficiency and recyclability. It helps to preserve and protect the product’s quality, flavor and shelf life while providing a visually appealing package for consumers