齿面点蚀是一种典型的行星齿轮系统故障.为识别点蚀状态,本文开展动力学特性研究并提出了一种新型的评估指标.首先,虑及过渡曲线和齿间结构耦合效应,利用改进Weber法建立了精确的含点蚀故障齿轮副啮合刚度模型,并研究了故障程度对啮合刚度的影响规律.然后,综合考虑时变啮合刚度、静态传动误差、齿侧间隙和时变振动传递路径等多种因素构建了行星齿轮系统平移-扭转动力学模型,揭示了点蚀程度对系统动态特性的影响规律,并基于振动信号频谱特点提出了边带能量因子(Sideband Energy Factor,SEF)用于损伤评估.最后,利用实验验证了仿真模型的正确性及所提指标的有效性.
Research on Dynamic Characteristics and Damage Assessment of Planetary Gear System with Pitting
Tooth surface pitting is a typical fault of planetary gear system.In order to identify the pitting state,the dynamic characteristics are studied and a new evaluation index is proposed in this paper.Firstly,considering transition curve and the structural coupling effect between teeth,an accurate meshing stiffness model of gear pair with pitting fault is established by the improved Weber method,and the influence of fault degree on meshing stiffness is studied.Then,the transverse-torsional coupling dynamic model of planetary gear system is established by comprehensively considering many factors such as time-varying meshing stiffness,static transmission error,backlash and time-varying vibration transmission path,and the influence of pitting degree on the dynamic characteristics of the system is revealed.Based on the spectrum characteristics of vibration signal,the sideband energy factor(SEF)is proposed for damage assessment.Finally,experiments are used to verify the correctness of the simulation model and the effectiveness of the proposed indicator.
fault diagnosisplanetary gear systemtooth surface pittingdynamic characteristicssideband energy factordamage assessment
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