行星滚柱丝杠具有高功率密度的特点，在高端装备中已逐步取代滚珠丝杠，成为直线伺服系统的首选零部件。与相同丝杆直径的滚珠丝杠相比承载能力提高6倍，螺母直线速度可达2m/s、加速度达3g。在高速、重载和高加速循环启停苛刻工况下，行星滚柱丝杠螺纹接触界面难以保持全膜流体润滑状态，极易发生磨损，影响其动态性能的稳定性和精度寿命。本项目建立考虑螺纹接触界面蠕滑效应的动力学模型，获得螺纹滑滚界面接触摩擦行为与摩擦力矩、传动效率和刚度的关联规律；研究高加速换向启停过程中行星滚柱丝杠动力学特性与界面润滑状态耦合作用机理，揭示螺纹接触界面磨损发展和动态性能退化的演变规律；提出基于均载优化、硬度匹配和螺纹副间隙控制的行星滚柱丝杠综合优化设计方法，抑制螺纹接触界面磨损对其动态性能退化的影响。为发展高刚度、低摩擦和高可靠性的行星滚柱丝杠和性能评价体系提供技术支持，具有重要的理论意义和应用价值。

Because of the high power density, the planetary roller screw mechanism (PRSM) becomes the first choice of linear servo system instead of the ball screw. Compared with the same size of ball screw, the PRSM’s carrying capacity is six times larger. The straight-line velocity of nut could reach to 2m/s, and the acceleration could reach to 3g. In extremely demanding conditions that high speed, large load, high acceleration and loop start-stop, the PRSM would difficult to hold on the full film fluid lubrication state at the contact interface that it would easy to wear, which would influence its dynamic property as stability and lifetime. In this program, a dynamical model of PRSM in view of creep effect at the thread contact interface would be established, to get the mapping relation of friction moment, transmission efficiency and the stiffness. This program would study the dynamic characteristic and interface lubrication state coupling mechanism of PRSM in the loop start-stop working condition, and further on, uncover the transformation law of the wear development and performance degradation. The optimum design method of PRSM would be put forward base on the uniform loading optimization, hardness matching, and thread backlash control, which could be used to restrain the influence that thread wearing on the performance degradation. The results of this program would provide the technical support to the development and evaluation of PRSM with high-stiffness, low friction and high reliability, and the results of this program would be with important theoretical significance and application value.