Analysis on vertical-pitch coupled dynamics characteristics of shearer with corrected load.
Analysis on vertical-pitch coupled dynamics characteristics of shearer with corrected load.
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修正载荷采煤机垂距耦合动力学特性分析
DOI：
10.1038/s41598-021-98221-3
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发表时间：
2021-09-20
影响因子：
4.6
通讯作者：
Wei Y
中科院分区：
文献类型：
--
作者：
Yang X;Chen H;Li P;Wang X;Wei Y
针对采煤机在实际工作条件下垂直和俯仰振动严重的特点，应用多体动力学理论，建立了采煤机13个自由度的垂直-俯仰耦合动力学模型。基于弹性理论、赫兹接触和碰撞动力学，分别建立了剪切体与牵引段、带间隙摇臂与牵引段的连接刚度模型、导靴和光滑靴的支撑刚度模型以及摇臂的刚度特性模型。考虑到求解过程的收敛和结果的可靠性，提出了一种改进的滚筒载荷作为系统的外激励，并分析了采煤机关键部件在不同工况下的动态特性。通过机械试验得到采煤机整机和关键部件在不同工况下的振动响应，对数值模型进行了验证。研究结果为采煤机结构优化和工艺参数优化提供了理论依据。
With regard to the severe vertical and pitching vibration of shearer in actual working conditions, the vertical–pitch coupled dynamics model of shearer with 13 degrees of freedom was established using multi-body dynamics theory. Based on the elasticity theory, Hertz contact and collision dynamics, the connection stiffness model of shear body and the traction section, the rocker arm with clearance and the traction section, the support stiffness models for the guide shoe and the smooth shoe, and the stiffness characteristics model of the rocker arm were constructed respectively. Taking into account the convergence of solution process and the reliability of results, a modified drum load was proposed as the external excitation of the system and the dynamic characteristics of key parts of shearer under different working conditions were analyzed. The numerical models were validated against the vibration responses of the whole machine and critical components of shearer obtained from mechanical test under different operating conditions. The research results provide theoretical basis for the structure optimization and process parameter optimization of shearer.
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