Browsing by Author "Ogunbiyi, Olalekan"
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Item AJ-Olu-1: An Innovative Path Loss Model for Typical Nigerian Urban Environments(Kampala International University, Uganda, 2023-04) Akanni, Jimoh; Isa, Abdurrhaman Ademola; Ogunbiyi, Olalekan; Olufeagba, Benjamin Jimmy; Sanni, Tunde AbdulrahamThe modeling of outdoor path loss propagation is critical in the planning and construction of the Global System for Mobile Communication (GSM) coverage area. For GSM signal prediction at any location inside its service region, a precise forecast based on critical characteristics and a mathematical model is required. Numerous research findings on path loss propagation model forecast for GSM mobile networks conducted in various cities in Nigeria revealed that the COST 231-Hata model gives closer prediction to most of the practical measure path loss values. Based on the existing COST-23-Hata path loss model and outdoor measurements at 1800 MHz frequency range within Ilorin metropolis, this paper proposed a suitable path loss model. The developed model was used and validated in various locations throughout Ilorin city with the measured and COST-231 Hata models. The analysis of the results revealed that the developed model performed satisfactorily in terms of the closest path loss prediction to the practical measure path loss values at all study locations. It also has the lowest Square Root Means Error and Standard Deviation (SD) of any Base Station (BTS) tested in Ilorin, Nigeria. As a result, it is concluded that the newly developed AJ-Olu-1 model is more suitable for GSM 1800 network design and installation in Ilorin City, Nigeria, as well as other cities in Nigeria and other cities outside Nigeria with similar environments.Item A control model of the operating head dynamics of Jebba hydropower system(Federal University of Technology, Minna, Niger Sate, Nigeria, 2019) Akanni, Jimoh; Ogunbiyi, Olalekan; Thomas, Cornelius; Omeiza, Issac; Olufeagba, BenjaminElectricity availability in Nigeria has been very poor over the years, underscoring the need for a better approach for managing generating resources. This paper presents the development of a dynamical model of the operating head of Jebba hydroelectric power plants for system studies and control system design. The mathematical model of the plant was developed from flow continuity conditions, some model parameters were obtained from the source while others were estimated from observations and analysis of the measured data. The developed dynamical equation was validated by comparing the response produced with values obtained by measurement. Upon integrating the model equation in Microsoft EXCEL VBA® environment, a deviation of 2% from measured values was observed. Operators can therefore use the model as a decision support system, while control engineers can find the model directly applicable for optimal and robust control system design for the station.Item Development and Implementation of a Prototype Automatic Rain-Sensor Car Wiper System(Department of Pure & Industrial Chemistry, University of Port Harcourt, Nigeria, 2022-11) Akanni, Jimoh; OJO, Ayodapo Oluwasegun; Abdulwahab, Abdurasaq; Isa, Abdurrhaman Ademola; Ogunbiyi, OlalekanVarious studies have been conducted over the years on how to reduce driver distractions while driving, but with little effort on the distraction that could be caused by manually operated wipers while driving whenever it rains. Drivers frequently take their hands off the steering to turn ON/OFF and adjust the wiper speed when driving during rain, which causes a loss of concentration and increases the risk of a car accident. This paper presents an automatic car wiper prototype system that adjusts the speed of the wiper based on the intensity of the rain. The system also includes an audio alert that warns the driver to stop driving during heavy rain. The rain sensor/intensity and servo motor; which regulates the wiper's speed, were interfaced by an ATMega328 (Arduino Uno A000066). It performed satisfactorily, with average response times of 0.78 seconds, 1.95 seconds, and 6 seconds for rainwater detection, increasing rain intensity, and no rain detection respectively. The wiper speed was 15 rpm at moderate rain intensity and 32 rpm at heavy rain intensity. The wiper average response time and speed shows that it is a system that eliminate delay as compared to manually operated car wiper system. The developed system will reduce driver distractions while driving thereby reduces the risk of a car accident. As a result, this system can be combined with new technologies seen in contemporary vehicles.Item Dynamical control model of the cascaded Kainji-Jebba hydropower operating head(Published by Faculty of Engineering, Federal University Oye-Ekiti, Ekiti state, Nigeria, 2019) Akanni, Jimoh; Ogunbiyi, Olalekan; Thomas, Cornelius; Omeiza, Issac; Olufeagba, BenjaminOperation and design of control system for the cascaded Kainji-Jebba hydropower system poses a great challenge to researchers and engineers. The difficulties arose from the fact that the system is affected by several nonlinear interacting factors such as variations in inflows, stochastic factors that are weather related, availability of the turbo-alternators, and numerous other constraints that are influenced by the system dynamics. All these makes the mathematical representation of the system difficult. This paper presents the development of a dynamical model for the operation and optimal control of the operating heads of the cascaded system. The mathematical models were developed from energy conversion equation and Bernoulli’s equation. The model was calibrated and tuned using measured data. Upon validation by comparing the response of the model with measured head, a deviation within ±2% was observed, making it a good prediction of the system response and appropriate for control system design.Item Fire and explosive risk assessment for combustible powder pneumatic conveyor system(Annals of the Faculty of Engineering Hunedoara, 2020-02-01) Otuoze, Abdulrahaman; Ibrahim, Oladimeji; Akorede, MF; Abdulkarim, A; Abdulateef, A.I.; Ogunbiyi, OlalekanFailure to properly define operating hazards associated with pneumatic conveying system for combustible powder transportation has led to several incidences of fires and explosions. These hazards are mostly preventable if adequate safety measures are provided for the pneumatic conveying systems for dust and combustible materials during the system design, installation and operating stages. This paper presents assessment on risk of fire and explosive hazards associated with pneumatic conveying system for a combustible powder transportation and prescribe the best practice to prevent possible accident that might result from improper practice. The safety practice and relevant regulations for zoning of the operating area and guide for proper selection of suitable class of measuring instrumentation for safe system operation are enumerated.Item FIRE AND EXPLOSIVE RISK ASSESSMENT FOR COMBUSTIBLE POWDER PNEUMATIC CONVEYOR SYSTEM(2020-02) OLADIMEJI, Ibrahim; Otuoze, Abdulrahaman Okino; Akorede, Mudathir Funsho; ABDULKARIM, Abubakr 3.A.I ABDULLATEEF, 4.Olalekan OGUNBIYI; Abdullateef, Ayodele Isqeel; Ogunbiyi, OlalekanFailure to properly define operating hazards associated with pneumatic conveying system for combustible powder transportation has led to several incidences of fires and explosions. These hazards are mostly preventable if adequate safety measures are provided for the pneumatic conveying systems for dust and combustible materials during the system design, installation and operating stages. This paper presents assessment on risk of fire and explosive hazards associated with pneumatic conveying system for a combustible powder transportation and prescribe the best practice to prevent possible accident that might result from improper practice. The safety practice and relevant regulations for zoning of the operating area and guide for proper selection of suitable class of measuring instrumentation for safe system operation are enumerated.Item Nonlinear control model and operational support system for the Kainji Hydroelectric Power System(Faculty of Engineering, University of Nigeria, Nsukka, Nigeria, 2019) Akanni, Jimoh; Ogunbiyi, Olalekan; Thomas, Cornelius; Omeiza, Issac; Olufeagba, BenjaminOver the past years, hydropower model and control were largely based on classical and linear transfer function, this was motivated by the available control system design techniques that were available and the desire to simplify the design procedure. Such a model is inadequate for dynamic study and design of hydropower station in the presence of uncertainties in the water head, discharge rate, elastic water effect, traveling wave effect, large variation power output and frequency. This research, therefore, focuses on developing a nonlinear model for the Kainji hydroelectric power station. The model relies on the energy conversion principles, inflows, discharge, evaporation rate and number of units on busbar. The parameters of the model were also estimated, and the model validated with an error within +1.4% to -3.6%. The model is expected to be used to determine the optimal control policies for the operation of the station and the release of water to the downstream.Item Propagation Loss Determination of GSM Signal Strength in Selected Buildings in Ilorin, Nigeria(University of Maiduguri, Nigeria, 2021) Akanni, Jimoh; Oraiye, Oluwatosin; Abdurrhaman, Isa; Ogunbiyi, OlalekanGSM signal building penetration loss is a problem often encountered by subscribers inside a building. As a result of building penetration loss, poor reception and signal outages often occur in many indoor locations and this accounts for increased attenuation of received signal strength of a cellular network signal when a subscriber with a mobile phone moves from outdoor to indoor. The study assessed the GSM signal penetration loss in thatched, wooden, block, mud and zinc buildings. Three network providers named A, B and C was used for the experiment. A low budget but very effective equipment (Two Tecno Pouvoir 3 plus Android phone) was used as the measurement tool. It was loaded with Network Signal Info application developed by KAIBITS Software GmbH installed software and positioned inside and outside the building to record indoor and outdoor GSM signal strength respectively for the three service providers in Ilorin, Nigeria. The results were then analyzed in order to determine and compare the path loss introduced by each of the selected buildings. This process was repeated for all the selected buildings, and the measurement was carried out for 6 months. The findings revealed that the outdoor signal strength was higher than the indoor signal strength for all the selected buildings; it also revealed that penetration loss is likely to be a function of the material used in the construction of the buildings. Zinc building has the highest penetration loss of 12.0 dBm and thatched building has the least penetration loss of 2.6 dBm. Information from this research will assist in selection of building materials for good indoor cellular network signal …Item A steepest descent algorithm for the optimal control of a cascaded hydropower system(Institute of Advanced Engineering and Science, 2020) Akanni, Jimoh; Ogunbiyi, Olalekan; Thomas, Cornelius; Omeiza, Issac; Olufeagba, Benjamin; Ogundepo, O.Y.Optimal power generation along the cascaded Kainji-Jebba hydroelectric power system had been very difficult to achieve. The reservoirs operating heads are being affected by possible variation in impoundments upstream, stochastic factors that are weather-related, availability of the turbo-alternators and power generated at any time. Proposed in this paper, is an algorithm for solving the optimal release of water on the cascaded hydropower system based on steepest descent method. The uniqueness of this work is the conversion of the infinite dimensional control problem to a finite one, the introduction of clever techniques for choosing the steepest descent step size in each iteration and the nonlinear penalty embedded in the procedure. The control algorithm was implemented in an Excel VBA® environment to solve the formulated Lagrange problem within an accuracy of 0.03%. It is recommended for use in system studies and control design for the optimal power generation in the cascaded hydropower system.