This is an open access article published by the IET under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/)
Planetary gear train (PGT) is widely used in a variety of fields such as helicopters and aircraft engines. The failure of meshing gear often happens in the PGT due to the working condition of high speed, variable load, highfrequency excitation, assembly error etc. However, the causes of gear failure are still insufficiency, especially in the condition of high speed and highfrequency excitation. In this work, the engaging force between gear meshing pair of the PGT under highfrequency excitation is studied using the proposed positioncorrelated modal properties calculation method, which is established by incorporating the effect of meshing position and meshing phase difference of each contact pair into the free vibration model to study the modal properties of the PGT at different meshing positions. The corresponding engaging force responses based on the positioncorrelated modal properties are investigated. The simulation results show that the higherorder natural frequencies of the system are greatly affected by the meshing position. The peaks of engaging force occur at meshing positions where the natural frequencies are equal to the excitation frequency, which can be the potential cause of the gear damage.
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