Study on multi-level progressive optimization of planetary roller screw mechanism

This paper establishes a multi-level progressive optimization model of planetary roller screw mechanism (PRSM) to achieve a more uniform load distribution, lower contact stress considering rolling-sliding friction and reduced axial clearance. By integrating the Halton sequence and Kriging model into the design of experiment (DOE), the sensitivity of various parameters to the optimization objectives is studied, thereby determining the optimization flow. Based on the proposed geometric constraints, a combination strategy employing the AMGA2 and Hooke-Jeeves algorithm is implemented to efficiently obtain optimization results, with the optimized parameters from previous levels serving as design constants for the subsequent level of optimization. Further comparisons demonstrate a notable enhancement in the comprehensive performance of the optimized PRSM, which is ultimately validated through FEM.