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Advances in Mechanical Engineering
Volume 2013 (2013), Article ID 978418, 9 pages
Research Article

Teaching Planetary Gear Trains with the Aid of Nomographs

College of Engineering, University of Al-Qadisiyah, Al Diwaniyah, Iraq

Received 28 April 2012; Accepted 22 November 2012

Academic Editor: Seung Bok Choi

Copyright © 2013 Essam Lauibi Esmail. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Planetary gear trains (PGTs) are introduced to undergraduate mechanical engineering students in the course of Theory of Machines. The complexity of the traditional methods for analyzing PGTs has kept many from becoming familiar with the capability of PGTs in mechanisms and machine design. In this paper a unified general formulation for simultaneously visualizing velocities, torques, and power flow through a train is presented on a single nomograph. Therefore, the increasing complex mechanical systems, such as automotive transmissions, are much easier to understand. Nomographs of Fundamental Gear Entities (FGEs) are constructed based on the nomographs of their fundamental circuits, without specifying the exact gear dimensions. They are then unified in one system nomograph. Nomographs are promising to provide designers with an efficient tool for the design of geared mechanisms.