All the equations for calculating the pitting resistance geometry factor I, and the bending strength geometry factor J, are valid for external spur gears that are generated by rack-type tools (rack cutters or hobs). In this thesis, using Visual Basic 6.0, an interactive program is developed for designing multistep involute standard and nonstandard spur gearbox according to the American Gear Manufacturers Association (AGMA) Standards 218.B88. Design applications are generally made by trial-and-error methods depending on the experience and the intuition of the designer. This design application includes more complicated problems that are not taken into account while designing single stage gear drives. Optimum design of multistep gearbox, since many high-performance power transmission applications (e.g., automotive, space industry) require compact volume, has become an important interest area. A series of studies have been conducted to reflect different aspects of gear dynamics. This project aims to advance the current understanding of gear dynamics by introducing more accurate and realistic gear dynamic modelling strategies for cylindrical gear (spur gear and helical gear) transmission systems with and without localized tooth defects (tooth fillet crack and spalling defect). Many researchers use dynamic modelling of gear vibration to increase knowledge about the vibration generating mechanisms in gear transmission systems and the dynamic behavior of gear transmission systems in the presence of some kinds of localized tooth defects. Increased demand for higher speed, improved performance and longer-lived machinery, makes the prediction and control of gear vibration and noise, as well as the early detection and diagnosis of gear defects important considerations. Gear transmission systems are widely used in many industry applications.
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