Mechanical Engineering

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Mechanical Engineering

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Author: search.filters.author.C. K. AjaniHas files: Yes

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    Problem of calculating time delay between pulse arrivals
    (American Journal of Engineering Research (AJER), 2015) O. A. Olugboji; J. Y. Jiya; C. K. Ajani
    This 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.
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    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. Ajani
    A 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.