Dynamic accuracy uncertainty analysis of harmonic reducer based on PCE

The dynamic accuracy of the harmonic reducer is related to the parts' tolerance and assembly clearance as well as the flexibility and friction of the harmonic reducer. Most of the published literatures consider only a single factor and do not take into account the influence of model parameter uncertainty. In this paper, the dynamic accuracy is researched considering static factors (machining and assembly) and dynamic characteristics (flexibility and friction). The nonlinear dynamic model is established, which contains static error and flexibility term. Polynomial chaos expansion (PCE) is used to handle the parameter sensitivity and uncertainty. By comparison, PCE is more efficient than Monte Carlo. Dynamic accuracy reliability is finally obtained through reliability analysis based on dynamic accuracy PCE.