Browsing by Author "Tsegay, Hagos"

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    Measurements of Energy of Gamma Radiation
    (Addis Ababa University, 2011-06) Tsegay, Hagos
    Gamma rays are electromagnetic radiation like x-rays and are the most energetic form of electromagnetic radiation with a very short wave length. theoretically i have measured the energy of interacted gamma rays using the NaI(Tl) and semiconductor detectors. The interaction and detection mechanism ,resolution of detector, detector e ciency for gamma measurement play greate role in increasing and decreasing the magnitude of the radiation energy .Gamma energy is proportional to the deposited energy by the photo electric ,compton and pair production interactions
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    Static Structural and Life Prediction Analysis of Feeder Table Head Shaft for Wonji-Shoa Sugar Factory Using ANSYS
    (Addis Ababa University, 2018-12) Tsegay, Hagos; Daniel, Tilahun (PhD)
    This paper deals with the problem occurred in the feeder table head shaft in wonji-shoa sugar factory. The total length of the feeder table head shaft is 11.877 meter. And the total capacity of the cane to feed is 6250 tone cane per day. The feeder table head shaft is subjected to repetitive load condition (bending and twisting). From the result of static structural analysis, the existing and hollow feeder table shaft is failed due to fatigue. To avoid the failure of the feeder table head shaft, the stress induced on the shaft is studied and reduce the maximum stresses occurs on the shaft. By modifying a new feeder table head shaft the stress is reduced comparing with the existing and hollow feeder table head shaft. The composition of the material is known by using the Spectro test in the Akaki basic metals industry. The models of the feeder table head shafts are prepared by CATIA software and import to ANSYS workbench. The finite element analysis has been performed on the feeder table head shaft in order to model and analyses static structural and life prediction analysis of the feeder table head shaft models. The result of the modified feeder table head shaft is compared with the existing and hollow feeder table head shaft based on different criteria’s which are maximum shear stress, maximum von-misses stress, fatigue life, fatigue factor of safety and deflection of the shafts. Finally, based on the comparison of the models result the modified feeder table head shaft is selected. The modified feeder table head shaft has better results of fatigue factor of safety, von-misses stress, maximum shear stress, deflection and fatigue life cycle with the same applied loads to the existing and hollow feeder table head shafts by increasing the diameter and changing its material.