Browsing by Author "Yahaya, S. A."
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Item Design of Low-Cost Vehicle for Nigerian Rural Farmers for Transportation of Farm Produce(USEP: Journal of Research Information in Civil Engineering, 2016) Abdulrahman, K. O.; Yahaya, S. A.The paper highlights various problems associated with the transportation of agricultural farm products by Nigerian rural farmers and discussed the classification of intermediate means of transportations (IMTs) and the common types of low-cost vehicles available. The research led to the design of an improved low-cost vehicle that is designed to be affordable, efficient and easy to maintain using locally sourced materials. The improvement in the design of the low-cost vehicle is seen in it compatibility, provision of roof cover, engine location at the rear, tilting of the trailer container, provision of more comfortable seats and the use of locally sourced materials for it construction.Item Development of obstacle and pit detecting ultrasonic walking stick for the blind.(Faculty of Engineering, Federal University Oye-Ekiti, Nigeria., 2019) Yahaya, S. A.; Jilantikiri, L. J.; Oyinloye, G. S.; Zaccheus, E. J.; Ajiboye, J.O; Akande, K.A.This project focused on improving mobility for a blind person by creating an obstacle and pit detecting walking stick using ultrasonic sensors. The project comprised of both hardware and software. The hardware consists of ultrasonic sensors, buzzers and a microcontroller, while the software consists of Arduino Integrated Development Environment (Arduino IDE), which was used to program the microcontroller. A Polyvinyl Chloride (PVC) casing was used to house the hardware components. The ultrasonic sensor that detects obstacles was programmed to detect obstacles at a distance of 100 cm or below and causes the buzzer to sound so as to alert the blind person. Another ultrasonic sensor was programmed to identify pit at a depression of 18 cm and above. This stick was tested to detect obstacles by 80 different blindfolded individuals within a room with different objects placed at different positions. Results showed that the percentage reduction of collision rate when comparing the developed ultrasonic walking stick to a normal white cane is 90.1%. This shows that the ultrasonic walking stick is reliable for domestic use by a blind person.Item Effect of set-up height on the performance of pot-in-pot cooling device for storing food and drugs at ambient temperature(FUOYE Journal of Engineering and Technology, 2019) Yahaya, S. A.; Akande, K. A.; Raji, A. O.; Abdulrahman, K. O.; Enagi, I. I.The research aimed at evaluating the effect of set-up height on the performance of earthenware pot-in-pot cooling system. The pots were set up at different heights; H1 (0 m), H2 (0.5 m) and H3 (1 m) and observed for 59 days from 8:00am to 6:00pm daily. The inner temperatures obtained from the three different arrangements were determined using standard methods. The result showed that increasing the height from ground level (0 m) to 1 m increases the mean cooling effect by 8 %. Generally, it was observed that only the set-up height at 1m proved to have maximum efficiency of the pot-in-pot system performance.Item Microstructural and Mechanical Properties of Failed Coupling with an Airlock in a Flour Mill(IJMET: International Journal of Mechanical Engineering and Technology, 2018) Abdulrahman, K. O.; Adediran, A. A.; Abraham, A.; Abdulkareem, S.; Olawale, I. M.; Yahaya, S. A.In the present work, we report the microstructural and mechanical properties of failed coupling with an airlock in a flour mill. The coupling which was made of aluminium alloy is used to transmit torque from the electric motor to an airlock used on a flour mill production line. The fracture that occurred at the root of the teeth of the coupling was investigated using various tests and analysis. The tests includes: macro examination, micro-structural examination, composition analysis, hardness and tensile test were employed for this investigation. From the tests carried out, it was observed from the macro examination that the coupling undergoes a brittle failure. However, composition analysis revealed a relatively high weight composition of aluminium (87.5 wt. %) suggesting that the coupling was made of aluminium based alloy. The significant presence of Cu and Zn at 2.77 wt. % and 1.03 wt. % respectively indicates that the alloying elements were mainly of copper and zinc. The tensile test result revealed that the material has an ultimate tensile strength of 178 N/mm2 which is comparatively lower than most aluminium alloys. This might be as a result of the high Si composition of 7.24 wt. % observed from the chemical compositional analysis. The hardness result showed the Brinell hardness of the fractured samples as 76.53 BHN. The microstructure of the coupling at three different sections gave three different micrographs, further proving uneven distribution of the aluminium alloy element. Thus, the presence of Si at relatively high percentage, often intended to increase the strength, wear resistance and weldability may be detrimental to the coupling ductility and tensile strength and may have contributed to the early fracture of the coupling.Item Static fatigue analysis on the load container of a low-cost vehicle for Nigerian rural farmers(NIJOTECH: Nigerian Journal of Technology, 2018) Yahaya, S. A.; Abdulrahman, K. O.Static fatigue analysis was done on the container of a model of low cost vehicle for Nigerian rural farmers to determine how well the container has been designed and its resistance to notable deformation or damage, based on the load it was subjected to. The s tatic analysis performed involved the fixing of the container in areas where it is made to rest on the chassis. Finite element analysis of the vehicle container was conducted in two loading conditions. The result from the analysis gave a factor of safety o f 4 . 3 6 f o r t h e l o a d c o n t a i n e r a t a m a x i m u m displacement of 0.131 mm and a factor of safety of 4.65 for the load container and a maximum displacement of 0.136 respectively for the two loading conditions. These maximum displacements, which can be negligible shows that the load container is well designed as the maximum stresses are above the hand calculated maximum stresses.Item Test systems for the biomechanical evaluation of hip protectors: a systematic review(Springer, 2019) Yahaya, S. A.; Ripin, Z.; Ridzwan, M.Various mechanical and biomechanical test systems to evaluate the effectiveness of hip protectors designed to prevent hip fracture as a result of falls were examined in this review. The articles considered were selected systematically. The effect of differences in design criteria was demonstrated, and it was observed that the impact energy employed during testing dramatically affects the performance of the hip protector. Over the past three decades, researchers have continuously experimented with various systems to determine the efficacy of various hip protectors. The primary aim has been to make informed decisions in optimizing hip protector design. This article provides a systematic review of various test systems employed in the determination of the biome- chanical efficacy of hip protectors. A systematic literature search was carried out, and 28 relevant articles were included to demonstrate the effect of test systems in the evaluation of the biomechanical effectiveness of hip protectors. Methodological studies illustrated the appropriate use of impact testing systems for the simulation of hip anatomy and fall dynamics in evaluating the effectiveness of hip protectors in preventing a hip fracture. This systematic review has demonstrated the effect of the variability of test systems on the evaluation of impact attenuation by various hip protectors. The lack of standardized test systems accounts for the inconsistencies in the test results of the efficacy of hip protectors. This has been a major challenge in the efforts of researchers to optimize the interventions. The standardization of test systems may require needed improvements immediately as opposed to the development of new interventions in order to ensure that only hip protectors with adequately proven efficacies are deployed for clinical trials or for the protection of the hips of vulnerable individuals from sideways impact.