基于VP-MFC的采煤机摇臂系统齿轮性能退化可靠性分析

Analysis on reliability of performance degradation for gear in rocker system of shearer based on VP-MFC

齿轮作为采煤机摇臂系统的关键零件,其性能退化对采煤机的工作可靠性有着重要影响。建立了采煤机摇臂系统的刚柔耦合虚拟样机(VP)模型,基于仿真结果,计算得到温度载荷,应用ANSYS对摇臂系统的薄弱齿轮副进行多场耦合(MFC)分析,得到了齿轮的温度场及结构场云图。建立引入裂纹后的齿轮有限元模型,利用FRANC3D对其进行断裂裂纹扩展数值模拟,得到了齿轮的裂纹前缘应力强度因子、扩展轨迹与疲劳寿命。提出以齿轮的裂纹扩展疲劳寿命和可靠度为退化指标的定量评估方法,结果表明齿轮性能退化成指数分布。将虚拟样机、多场耦合与断裂力学相结合,为齿轮性能退化可靠性研究提供了新的方法。

As the key part of rocker system in shearer,the performance degradation of gear has important influence on the working reliability of shearer. An rigid-flexible coupling virtual prototype（ VP） model of rocker system in shearer was established,and the temperature load was obtained based on the simulation results. The multi-field coupling（ MFC） analysis was conducted on the weak gear pair of rocker system by using ANSYS,and the temperature field and structure field nephogram of gear were obtained. The finite element model of gear after introducing into crack was established,and the numerical simulation on fracture crack propagation was carried out by using FRANC3 D,then the stress intensity factor on crack front,the propagation track and the fatigue life of gear were obtained. A quantitative evaluation method taking the crack propagation fatigue life of gear and the reliability as the degradation indexes was proposed,and the results showed that the performance degenerate of gear presents an exponential distribution. It provides a new method for reliability research on performance degradation of gear by combining VP,MFC and fracture mechanics.