谐波柔轮力学分析与疲劳寿命研究

为了完善谐波齿轮刚-柔轮系统装配与啮合过程中的力学响应及柔轮疲劳寿命研究,提出了一种基于刚柔耦合与瞬态动力学分析理论的刚-柔轮系统装配与啮合分析方法,得到了更加准确与合理的谐波柔轮装配及啮合过程中柔轮的应力分布和疲劳失效位置;柔轮结构和材料参数变化对其疲劳寿命的灵敏度研究,指出了柔轮疲劳设计的关键参数,并进一步指出了柔轮的疲劳寿命尺寸效应具有敏感区间,据此建立了柔轮的疲劳寿命模型.结果表明,谐波齿轮刚-柔轮系统的力学与疲劳寿命分析不能忽略装配与啮合过程的影响;柔轮的设计应该规避疲劳寿命尺寸效应的敏感区间,以提高谐波齿轮的使用寿命.

Study on Mechanical Analysis and Fatigue Life of Harmonic Flexspline

In order to improve the mechanical response and fatigue life of the flexible spline (FS) during the assembly and meshing of the rigid-flexible wheel gear of the harmonic drive, an assembly and meshing analysis method of rigid-flexible gear system based on rigid-flexible coupling and transient dynamic analysis theory was proposed. Stress distribution and fatigue failure position of FS were obtained more accurately and reasonably. The sensitivity of the structure parameters of FS and material property to its fatigue life indicates that the key parameters of the fatigue design of FS, and the fatigue life size effect of FS which has sensitive range, are also noted. In addition, the fatigue life model of FS was established. The results show that the mechanical and fatigue life analysis of the rigid-flexible gear system of the harmonic drive cannot ignore the influence of the assembly and meshing process. The design of flexible wheel should avoid the sensitive range of fatigue life size effect to improve the service life of harmonic drive.