Abstract
A summary of a computer program and sample results are presented that predict the dynamic gear tooth load response for single-stage epicyclic gearing systems. The model used is an extension of the Richardson model developed in 1958 and the high-contact-ratio enhancements made by Cornell and Westervelt in 1978. The program has a preprocessor that will generate all the necessary geometric data for solving the system dynamics with a minimum of user input data. The program has the capability of modeling symmetric and buttressed, external and internal spur gear teeth, as well as the helical tooth form. Tooth profile modifications, planet gear phasing, gear tooth runout, and spacing errors can be modeled and evaluated. Summary tables are generated along with plotted data for dynamic tooth loads, flash temperatures, tooth bending stresses, hertz stresses, etc. The program also includes options for evaluating a floating input pinion, a flexible planet carrier, or a flexible ring gear, and the system natural frequencies. A speed survey option is also available to find peak dynamic loads.
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