斜齿轮齿面剥落故障动力学建模与动态特征研究

Dynamics Modelling and Dynamic Characteristic of Spalling Defect of Helical Gear

斜齿轮存在移动载荷及空间结构复杂等因素,导致斜齿轮齿面剥落故障振动特征的提取非常困难。为了分析斜齿轮齿面剥落故障引起的振动响应特征,提出了基于切片法和势能法的斜齿轮齿面剥落故障啮合刚度的计算方法,考虑斜齿轮齿面剥落故障接触线长度的变化,分析了齿面剥落在长度和宽度两个方向扩展对时变啮合刚度的影响。同时,建立了6自由度斜齿轮系统动力学模型,获得了不同长度齿面剥落的动态响应特征及不同转速和负载对其的影响。研究结果表明,新的计算方法能够准确计算斜齿轮齿面剥落故障对啮合刚度、动态响应等特性的影响,可为齿轮系统状态监测提供依据。

Due to the moving loads and complex spatial structure characteristics of helical gears,it is difficult to acquire and diagnose the vibration characteristics of the helical gear with spalling defect. To analyze the failure mechanism caused by tooth surface spalling,by considering the change of contact line length induced by the spalling defect,an analytical model is proposed to calculate the mesh stiffness of helical gear with spalling defect based on the microtomy and the potential energy method. The effects of spalling length and width on the time-varying mesh stiffness are analyzed. At the same time,a six degrees-of-freedom dynamics model of the helical gear is built,the dynamic response with different spalling length and the effects of rotational speed and load on the dynamic characteristics are obtained. The result of study shows that,the proposed new model is able to accurately calculate the mesh stiffness,dynamic response and other characteristics of the helical gears under the influence of spalling defect. The basis for the gear system status detection is provided.