多源驱动的采煤机短程截割传动系统固有特性分析

针对传统采煤机截割传动系统存在传动链过长、可靠性差、突变工况调速性能差的特点，在提出的多源驱动的采煤机短程截割传动系统的基础上，采用集中参数法建立了系统平移-扭转-轴向耦合动力学模型，进行了系统固有特性分析。结果表明，耦合轮系和行星轮系耦合时重根频率不变，单根频率发生变化;单根振动模式变得更为复杂，重根振动模式与原来保持一致;模态能分布与构件形变振动状态一致;耦合轮系支撑刚度和构件质量对系统高阶固有频率影响较大，行星轮系支撑刚度对系统低阶固有频率影响较大;而啮合刚度均对高阶固有频率影响较大。对系统激励频率和固有频率对比分析，发现系统低速运行时可能发生共振。研究结果可为避免系统出现共振现象和实现动态特性优化提供理论依据。

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 stiffness of the coupling train has a great influence on the high order natural frequency of the system,and so does the stiffness of the planetary gear train on the natural frequency of the system.The mesh stiffness and the mass have great influence 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.