Analysis of natural characteristics of multi-source driving short cutting transmission system of coal shearer

In terms of the long transmission chain,poor reliability and poor speed adjusting performance in the sudden change of working conditions in the traditional shearer cutting transmission system,the coupling dynamic model of translational-torsional-axial is established by using the centralized parameter method based on a multi-source driving cutting system. Compared with the original system,the results on the natural characteristics of the system show that the frequency of the single root changes slightly and the multiple root is the same when the coupling wheel train and the planetary gear train are coupled. However,the vibration mode of the multiple root frequency is the same as that in the original system. The distribution of modal energy is in accordance with the state of deformation and vibration. The stiff-ness of the coupling train has a great influence on the high-order natural frequency of the system,and so does the stiff-ness of the planetary gear train on the natural frequency of the system. The mesh stiffness and the mass have great in-fluence on the high-order natural frequency and little influence on the low-order natural frequency. Also,it is found that the system may resonate at low speed. The results of this study can provide a theoretical basis for avoiding system resonance and dynamic characteristic optimization.