Papers by Abiola O. Ajayeoba
Springer eBooks, Nov 22, 2023
LAUTECH Journal of Civil and Environmental Studies, Sep 1, 2021
Increased rate of noise-associated risk factors such as speech interference and reduction in prod... more Increased rate of noise-associated risk factors such as speech interference and reduction in productivity, necessitated that control and regulation measures be put in place, to contain anthropogenic noise pollution in the students' hostels. Therefore, this study assessed the various anthropogenic sources of noise pollution in students' hostels and developed a Sound Level Monitor and Control (SLMC) device. 1250 undergraduate students across 5 students' residential zones were sampled for demographics and investigations were conducted into respondents' perceived medical history, identification of noise sources, and evaluation of hearing loss. Effects of noise levels were evaluated using 100 respondents' rooms per zone following standard procedures, considering Sound-System-Only (SSO), Generators-Only (GO), and combination of Sound-System-and-Generator (SSG), loud-conversations, etc., as sources of noise. However, a noise control device incorporated with a circuit breaker was developed. The respondents were 51.2% male and 48.8% female, with 58% in the age range 18-27 years. The medical history showed that 1.2 and 6.4% had a hearing problem in short and long times, respectively, while 43.6% affirmed that SSO was a major noise pollution causal factor. SSO, GO, loud conversations, traffic, and grinding machines were identified as the prominent sources of anthropogenic induced noise. The minimum average SL result gave a value of 62.8400dB for both ventilated and unventilated rooms, which is 14% above 55dB threshold value recommended by the National Environmental Standards and Regulations Enforcement Agency. The developed SLMC device gave notification at the SL above 55dB for 15 seconds before disconnecting the sound system if not regulated.
World Journal of Advanced Engineering Technology and Sciences
Failure Mode and Effect Analysis (FMEA) is an approach used for maintenance system reliability an... more Failure Mode and Effect Analysis (FMEA) is an approach used for maintenance system reliability analysis. FMEA is applied to the Taurus 60 Gas Turbine Power Plant System (GTPPS). The unexpected failures with the associated maintenance costs are major problems in most power plants. In this study, critical components of the Taurus 60 gas turbine power plant were identified. Twenty-five sub-assemblies were identified and the probable failure modes of the main sub-assemblies. Failure analysis and the Risk Priority Numbers (RPN) of the critical sub-assemblies were determined using failure modes and effect analysis method. Failure analysis and the Risk Priority Numbers (RPN) of the critical sub-assemblies were determined using failure modes and effect analysis method. Based on criticality analysis, six (6) critical sub-assemblies were identified. These are fuel gas supply, air filter package, air trap package, gearbox, compressor rotor assembly and fuel injector with criticality numbers 12...
Lautech Journal of Engineering and Technology, 2017
The manufacturing industry is one of the most dangerous branches in light of the frequency of occ... more The manufacturing industry is one of the most dangerous branches in light of the frequency of occupational accident. Direct and indirect losses generated by major manufacturing accidents reduce profit and cause management crises. Such losses significantly impact manufacturing business owners, workers, clients and the public. This research evaluated the effect of safety practices on operational performance of some selected manufacturing companies in Nigeria. Ten-year data were collected on yearly basis from four (4) manufacturing industries in Nigeria which are chemical, oil/gas, food/beverages, and metal/fabrication industries on annual record of accidents and annual expenditure on safety intervention programmes. The data were analyzed using existing mathematical models. The probability of each class of accidents has highest values estimated as: 0.19, 0.52, and 0.68 for fatal, serious and minor accidents, respectively while the lowest was estimated as: 0.03, 0.2, and 0.32 for fatal, serious and minor accidents, respectively. The highest accidents cost of potential consequences of accidents were estimated as N94,701,700, N13,339,567and N2,969,210 for fatal, serious and minor accidents, respectively while the least accidents cost was estimated as N541,072, N1,834,120 and N341,562 for fatal, serious and minor accidents, respectively. However, minor and fatal accidents in metal/fabrication industry has the highest (0.68) and the least (0.03) values of probabilities of occurrence of accident, respectively, while fatal accident in oil and gas industry has the highest cost of accident estimated as N94,701,700 (fatal accident) which is 93.21% of the total cost of accidents in the industry.
Industrial Engineering Letters, 2017
Electric power generator is an essential household facility particularly in developing countries.... more Electric power generator is an essential household facility particularly in developing countries. It exists in various capacities and makes in shops, offices, workshops and factories. The attendant environmental risks of this source of power supply are major challenges to users both at household and industrial level. Efforts through research and development are still on-going to mitigate the prevailing health hazards. This study investigates noise level of typical portable generator (2 kW/220 V) and the sound absorbance capacity of an acoustic enclosure developed from a multilayer panel made of locally sourced galvanized metal sheet (0.90 mm), Polyurethane acoustic foam (7.50 mm), Particle board (35.0 mm) and plywood (10.0 mm). The noise produced by the generator when on load and no load were considered for cases of it being placed inside and outside the enclosure and compared with acceptable OSHA safe thresholds noise level for the school environment where the study was carried out...
In this study, manufacturing accident cost model is proposed. The cost of each class of accidents... more In this study, manufacturing accident cost model is proposed. The cost of each class of accidents (C i) was developed in terms of probability of accident occurrence (ρ ai), degree of fatality (f i), establishment average annual salary (γ), establishment maximum allowable service year (z), human severity for the class i (H i), equipment damages (E qi), service life of the equipment (L), usage life of equipment (T), interest rate (t), acquisition cost of machine (N), machine hour rate (MHR), machine down time (θ i), economic implication cost (E ci), value of goods (Q i), total hour lost (β i) and establishment's overall hourly cost of production (α). Data were collected from eleven textile industries in Nigeria on accidents occurrence and cost of consequences of accidents. Three classes of accidents were identified as: fatal, serious and minor. The collected were used to estimate the model parameters. The unit cost of each class of accidents was estimated to be fatal: N2,665,360.0...
Procedia Computer Science, 2023
The Ethiopian journal of science and technology, Nov 7, 2022
Appraisal of body height (Bh) from leg length (LL) and other anthropometric parts of an individua... more Appraisal of body height (Bh) from leg length (LL) and other anthropometric parts of an individual is very important in the identification of human skeletal remains. The objective of this study was to develop a model for the estimation of Bh male , Bh female and Bh combined. The study was conducted in three selected tertiary institutions in Southwest Nigeria with a total of 324 students (162 male and 162 female) using the snowball techniques where the Bh and LL of the students were measured using stadiometer and sliding caliper. The data were analysed statistically using statistical package for social sciences v 21 software. The result showed mean values of 168.49 ± 9.19 cm of Bh male , 168.15 ± 8.66 cm Bh female and 168.32±8.91 cm Bh combined. Similarly, the mean values of 96.40±7.29 cm LL male , 96.27±6.96 cm LL female and 96.33 ± 7.12 cm LL combined were found. Furthermore, the coefficient of determination, R 2 was determined as 76.0%, 19.1% and 44.3%, respectively. Three regression models were formulated to determine the Bh male , Bh female and Bh combined with LL male , LL female and LL combined as the predictors. It was concluded that this formulated model could be a veritable tool for the development of forensic anthropological studies for Nigerian student population.
Scientific Reports
Charcoal is a popular form of biofuel embraced for domestic and industrial purposes. However, the... more Charcoal is a popular form of biofuel embraced for domestic and industrial purposes. However, the use of Charcoal has some associated challenges, such as the required charcoal pot and setting it into the fire at first by using Charcoal-Ignition-Aiders (CIA) (e.g. discarded paper, nylon, rubber, plastics, petrol, the residue of processed palm oil, maise cob, wood, and kerosene). Coupled with the chemical properties of Charcoal, the resulting gases from CIA are capable of polluting the environment with perceived Adverse-Health-Implications (AHI) on the ecosystem. Therefore, this study conducted a safety assessment of charcoal biofuel usage and the effects of common CIA on combustion indices. This study followed standard methods and the use of peculiar equipment. This study established that Charcoal is commonly used in the studied area because it is cheap, readily available and requires less technical know-how. Considering the combustion indices, using paper as a CIA generated the lowe...
Nigerian Journal of Technology, Nov 1, 2021
Bakers are exposed to flour dust; thence, they face various tremendous health problems such as as... more Bakers are exposed to flour dust; thence, they face various tremendous health problems such as asthma and some other respiratory illnesses, which may be aggravated when combined with improper awareness of ways of protection and ignorance by bakery employers and employees. This study focused on bakers' speed of expiration in the selected geographical locations by assessing the Peak Expiratory Flow Rate (PEFR) of the bakers and also establishing equations involving their anthropometric parameters. A total of 435 subjects were considered for each group, classified as a test group and a control group. The PEFR and anthropometric data which includes age, height, weight, and length of chest of bakers and non-bakers were collected using a Mini-Wright peak flow meter and Detecto PD300MDHR column scale. A self-reporting questionnaire was administered to each of the bakers. SPSS (version 21) and MS Excel (version 2016) were used to analyze the data. Descriptive and inferential statistics, as well as T-test analysis, were used to compare the data of the two groups. The study showed that bakers in
Innovative Systems Design and Engineering, 2021
Accidents happen and they upset the normal functioning of any organization causing real damage to... more Accidents happen and they upset the normal functioning of any organization causing real damage to persons, equipment, and loss of revenue. To mitigate these problems, safety performance metrics, and system dynamics have been implemented widely to solve the challenges of delays, feedback, and nonlinearity. A mathematical description of the relationships among the identified variables coupled with computer modeling was used to develop the Computer Programme Simulator (CPS) using MATLAB to code the dynamic relationship of the manufacturing safety system to determine accident prevention strategies. The safety dynamic equations were subsequently computed and this was followed by the processes of model application and experimentation. The results of the study showed that parameters such as "the constants", "initial state variables", "graphs to plot", "export graph" and "export table" allows the user to plug the desired variables into the CPS and provide data on the number of accidents to be reduced after the selection of the appropriate strategy. The first successful simulation of the CPS also produced a P = 60% and T = 10% reduction in the number of factory accidents. This study concluded that the CPS interactive interface which was developed serves as a useful tool for predicting, preventing, and even reducing factory accidents and makes safety management systems easy. The outputs of all the simulations also revealed that the reduction of accidents and the cost of accidents in all the values of the proportion of available budget and desired accident reduction target computed are practicable.
INTERNATIONAL JOURNAL OF MECHANICAL ENGINEERING AND TECHNOLOGY (IJMET), 2021
Sawmills are workshops where woods are turned into finished products through the use of industria... more Sawmills are workshops where woods are turned into finished products through the use of industrial machines and sophisticated implements. However, sawmills workers become exposed to awkward working postures and vibration from the machines they work with every day, leading to Raynaud's disease and muscle damage. Therefore, this study investigated the effects of the sawmill-machine-generated vibrations on the musculoskeletal disorders of sawmill workers in the Southwestern part of Nigeria using hand-arm-vibration analysis. Sawmills that were fully functional in Osun, Oyo, Ondo, Ekiti, Lagos, and the Ogun States of the Southwestern part of Nigeria were used for this study. After reconnaissance visits, four sawmills operating at full capacities in two cities of each State (i.e. 2 sawmills per city) were eventually chosen and used for data collection, thereby making a total of 24 selected sawmills. Circular Machines (CMs), Planer Machines (PMs), and Band-saw Machines (BMs) which are the commonly used machines by sawmills were considered for analysis, Vibration Exposure Assessment of Sawmilling Operations using Hand-ARM-Vibration Exposure Analysis
Advanced Engineering Forum, 2019
Sawmill activities are characterized with different degrees of injuries and accidents due to inde... more Sawmill activities are characterized with different degrees of injuries and accidents due to indecorous handling of sawmill machineries, lack of necessary accident prevention facilities, skill, poor safety culture and practices. However, to guarantee safety in this kind of environment, it is highly imperative that the industry adopt and implement a range of effective occupational health and safety management measures in an efficient way that will lead to more favorable and safe environment for all stakeholders. The safety of stakeholders and facilities however necessitated this work. Two major sawmills were considered in two main towns or cities in each of the six southwestern states of Nigeria, namely: Ekiti, Lagos, Ogun, Ondo, Osun and Oyo States, which formed part of the major wood producing rain forest areas in Nigeria. Some of the accidents causing activities identified were: human, deficiency in maintenance, environmental and Lack of Personal Protective Equipment (PPE) among o...
International Journal of Engineering Research in Africa, 2018
This study aimed at the development of a mathematical model for the evaluation of profitability o... more This study aimed at the development of a mathematical model for the evaluation of profitability of safety and health programme in Tobacco industry in Nigeria. A cost function monetary savings/loss in terms of accidents and heath incidences preventions, was developed. Accidents and health incidences for both pre – safety period and safety programme period data were collected. Four classes of accidents were identified as fatal, serious, minor and trivial wounds with their costs determined as N2,455,750, N221,275,N26,780, and N2,000, respectively. Also, seven health incidences were identified as hearing issues, back pain/ache, leg pain/ache, chest pain/ache, neck pain/ache, eye issue and headache with their costs determined as N18,176, N22,987,N8,354, N17,296,N33,305,N14,432 andN12,842, respectively. Accident prevention programme had monetary savings of N40.1 million while about N9.7 million were lost on health incidences annually. The results showed that the safety programme performan...
International Journal of Engineering Research in Africa, 2018
The study presents a mathematical approach of safety policy in terms of safety target and budget ... more The study presents a mathematical approach of safety policy in terms of safety target and budget implementation factor. System dynamics were used to develop a hybrid model of accident occurrence and preventions in terms of pre-safety programme accidents, budgeting factor, proportion of budget to be implemented, strategy effectiveness index, workforce, accident proneness factor, prevented accidents, accident reduction target, probability parameter and estimated cost of accident. Hence, a cost savings/loss model was derived in terms of the identified parameters. Proportion of budget to be implemented (P) and accident reduction target (T) are the input policy parameters. At proportion of planned budget below P = 0.6 showed that the budget would not be enough to reduce any accident nor save any cost. Thus, throughout the simulation period, a minimum monetary savings of N10.775 millions was achieved at P=1 and T=10% and highest monetary savings of N36.955millions was achieved at and T=25%.
Brazilian Journal of Operations & Production Management, 2015
Cement industry is responsible for approximately 5% of global anthropogenic carbon dioxide emissi... more Cement industry is responsible for approximately 5% of global anthropogenic carbon dioxide emissions emitting nearly 900 kg of CO2 for every 1000 kg of cement produced. Effective control strategies to mitigate these emissions were discussed and a mathematical programming model able to suggest the best cost effective strategy was formulated. Control costs consisting of operating and retrofit costs along with the efficiency of control options are taken into account in the model. A representative case study from the cement industry was considered in order to illustrate the use of the model in giving optimal control strategies. The hazard control model was solved using commercial software called LP_SOLVE (Version 5.5) configured to apply the branch and bound algorithm. Efficiency improvement measures were the considered mitigation option and it was found to be effective options for reduction targets up to 18 %. Four efficiency improvement technologies were considered and a reduction of ...
Nigerian Journal of Technology
Bakers are exposed to flour dust; thence, they face various tremendous health problems such as as... more Bakers are exposed to flour dust; thence, they face various tremendous health problems such as asthma and some other respiratory illnesses, which may be aggravated when combined with improper awareness of ways of protection and ignorance by bakery employers and employees. This study focused on bakers' speed of expiration in the selected geographical locations by assessing the Peak Expiratory Flow Rate (PEFR) of the bakers and also establishing equations involving their anthropometric parameters. A total of 435 subjects were considered for each group, classified as a test group and a control group. The PEFR and anthropometric data which includes age, height, weight, and length of chest of bakers and non-bakers were collected using a Mini-Wright peak flow meter and Detecto PD300MDHR column scale. A self-reporting questionnaire was administered to each of the bakers. SPSS (version 21) and MS Excel (version 2016) were used to analyze the data. Descriptive and inferential statistics,...
Journal of Applied Engineering and Technological Science (JAETS), 2021
Development of a prototype inverter powered baking oven was carried out and performance was evalu... more Development of a prototype inverter powered baking oven was carried out and performance was evaluated to determine its efficiency. The oven was designed and fabricated with an outer dimension (506 mm length x 506 mm width x 506 mm height) made up of mild steel and inner dimension (436 mm length x 436 mm width x 436 mm height) made up of stainless steel and used fiber glass as an insulator. The materials for fabrications were locally sourced and served as alternative for baking, roasting or boiling using electrical recharged power in case of power failure. The prototype inverter baking oven operates on the principle of electrical resistance and 0.147?/W was obtained as the resistance of the heating element. The performance evaluation revealed the baking efficiency of the oven to be 94.29 %, 75 % and 66.7 % for bread, plantain and fish respectively, the maximum temperature of 160?C, 180?C and 200?C were recorded. Capacity of the baking oven was determined to be 6 loaves of bread per t...
International Journal of Engineering Research in Africa, 2019
Work-related Musculoskeletal Disorders (WMSDs) have been seen as major health problems that have ... more Work-related Musculoskeletal Disorders (WMSDs) have been seen as major health problems that have direct impacts on workers’ physical/psychosocial well beings, health, and productivity. Thus, the assessment of Musculoskeletal Disorders (MSDs) in sawmills will lead to a suitable platform for development and execution of proper ergonomic intervention programmes to achieve desirable workplaces. This research focused on determining the prevailing factors associated with MSDs and establishment of exposure’s level of sawmill workers to MSDs, based on risk and postural analyses using Quick Exposure Check (QEC), Rapid Entire Body Assessment (REBA) and Rapid Upper Limb Assessment Method (RULA); and physical strain assessment using relative Cardiovascular Load (% CVL), Cardiovascular Strain (% CVS) and Relative Heart Rate (%RHR) equations. Six hundred and sixty – three (663) male and thirty – three (33) female workers participated in the research survey and the participants were classified int...
Department of Mechanical Engineering, Adeleke, Nigeria. Department of Mathematical Sciences, Adel... more Department of Mechanical Engineering, Adeleke, Nigeria. Department of Mathematical Sciences, Adeleke University, Nigeria. Department of Mechanical Engineering, Ladoke Akintola University of Technology, Nigeria. Department of Industrial and Production Engineering, Federal University of Technology Akure, Nigeria. Department of Agricultural Engineering, Federal University of Technology Akure, Nigeria.
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Papers by Abiola O. Ajayeoba