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为构建电牵引采煤机摇臂故障诊断和状态监测的力学基础,研究摇臂齿轮传动系统在冲击载荷下的动态特性,建立了摇臂定轴减速器齿轮传动系统的动力学模型。基于摇臂高速区齿轮更容易发生故障的特点,以高速齿轮作为算例,分析了高速齿轮的动态特性。为了更准确地反映齿轮的动态特性,模型仿真时考虑到了齿轮啮合刚度的时变特性。研究结果表明,冲击载荷给齿轮系统的转速和动载荷带来突变,导致了齿轮故障的发生,同时冲击载荷影响齿轮的振动信号幅值,其傅里叶频谱复杂,给摇臂的故障诊断和状态监测增加了难度。
In order to build the mechanics foundation of rocker arm fault diagnosis and condition monitoring in electric traction shearer, the dynamic characteristics of rocker arm gear transmission system under impact load were studied, and the dynamic model of the gear transmission system of rocker arm fixed shaft reducer was established. Based on the fact that the gears in the high-speed range are more prone to failure, the high-speed gear is taken as an example to analyze the dynamic characteristics of the high-speed gear. In order to more accurately reflect the dynamic characteristics of gears, the time-varying characteristics of gear meshing stiffness are taken into account in the simulation. The results show that the impact load brings about sudden change of the rotating speed and dynamic load of the gear system, which leads to the occurrence of gear failure. At the same time, the impact load affects the amplitude of the vibration signal of the gear. The Fourier spectrum is complex, Condition monitoring increases the difficulty.