The present work contributes to the analysis of dynamic behavior of long wall coal shearer traction unit through dynamic model of geared drives. In contrast to the majority of the models in the literature, complete machine dynamic model of coal shearer is introduced for obtaining dynamic gear loads for traction unit. A new stochastic coal cutting loads model is presented. Predicted vibration accelerations were compared with coal cutting experiments. It is demonstrated that the predictions match very well with experimental data. Forced vibrations of traction unit gear system are studied to investigate the influence of some of the key design parameters. Frequency coupling phenomenon and cutting rock interlayer process are also investigated in this paper.
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