Abstract A dynamic analysis of a 2240-kW (3000-hp) helicopter planetary system is presented. Results from both analytical and experimental studies show good correlation in gear-tooth loads. A parametric study indicates that the mesh damping ratio has a significant effect on maximum gear-tooth load, stress and vibration. Correlation with experimental results indicates that the sun–planet mesh damping ratio can significantly differ from the planet–ring mesh damping ratio. A numerical fast Fourier transform (FFT) procedure is applied to examine the mesh load components in the frequency domain and the magnitudes of multiple tooth-pass frequencies excited by nonsynchronous meshing of the planets. Effects of tooth-spacing errors and tooth-profile modifications with tip relief are examined. A general discussion of results and a correlation with experimental study are also presented.
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