航空弧齿锥齿轮轮齿应力谱精确获取及分布估计

Precise Acquisition and Distribution Estimation of Tooth Random Stress Spectrum of Aviation Spiral Bevel Gear

航空弧齿锥齿轮在服役过程中,工况恶劣,振动冲击多,工作过程中的轮齿随机应力谱分布规律对弧齿锥齿轮的设计和寿命预测具有重要作用。根据弧齿锥齿轮动力学模型,计算各工况下的动载系数,建立综合考虑支持刚度变形和动载荷的弧齿锥齿轮加载接触分析有限元模型,通过计算和处理得到弧齿锥齿轮工作过程中的齿面接触应力谱和齿根弯曲应力谱样本,进而利用混合正态分布参数估计法对轮齿随机应力谱分布进行估计。

Aviation spiral bevel gear is working under severe conditions which are full of vibration and impact. Tooth random stress distribution is important for spiral bevel gear design and life prediction. The loaded contact analysis with finite element model of spiral bevel gear is established, considering deformation of support stiffness and dynamic load, which is calculated based on the dynamic model. Samples of tooth contact stress and tooth root bending stress spectrum are obtained. Then use the mixed normal distribution parameter method to estimate the distribution of tooth stress spectrum.