June 14, 2015
June 14, 2015
June 17, 2015
26.470.1 - 26.470.25
Design of Shaft and Bearing system in Eccentric and Nonaligned Gears Mounted on Rotating ShaftsAbstractIn Machine Design courses, students usually learn how to design a system consisting of ashaft and its bearings under rotating, bending, transverse, axial, and torsional loads. Althoughmost machine-design textbooks available today cover Rayleigh's and Holzer's methods,which are used in the classroom to find fundamental natural frequencies of the system inquestion, other important dynamic effects in shaft and bearing system designs, however, arenot treated or discussed by them. Typically, considering fatigue loading effects, the diameterof the shaft is calculated, and then the deflection of the shaft is evaluated by using staticdeflection formulas. The static deflection assumption might be reasonable to make in idealmanufacturing situation; however, it will cause serious errors in shafts' deflection resultingfrom eccentric and nonaligned gears mounted on the shaft. This manufacturing defectinduces loads that depend on the rotating speed of the shaft, which, in turn, causes dynamicdeflections that are speed-sensitive and could fall beyond the allowable limits of deflection atthe shaft's operating speed. The authors addressed this potential manufacturing defect issue ina Machine Design class as a term project, which also required students to transfer and applycontent knowledge from their dynamics and vibrations’ courses to come up with a viabledesign for the system in question. The authors and the students together believe that thisproject rendered important engineering education objectives in this design-oriented course.In this paper, we present all aspects of this pedagogically successful experience ofimplementing ABET strategies in the engineering classroom to maximize its reach andpotential impact.
Mohammadzadeh, A. R., & Haidar, S. M. (2015, June), Design of Shaft and Bearing System in Eccentric and Nonaligned Gears Mounted on Rotating Shafts Paper presented at 2015 ASEE Annual Conference & Exposition, Seattle, Washington. 10.18260/p.23808
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