Abstract
The high contact stress of the first few teeth of the planetary roller screw mechanism can be effectively alleviated by convex–to–concave contact mode. The load distribution model is constructed based on the convex/concave tooth profile model, and the maximum contact stresses at the screw-roller and roller-nut interfaces are simultaneously considered to construct a multi-objective optimization model (MOOM). However, complicated arc contact will inevitably make the MOOM involves many nonlinear constraints (NCs). Therefore, a feasibility identification-based NSGA-II is used to locate and further search the complicated feasible regions brought by many NCs for searching the best structural parameters. The results show that the contact stresses over thread teeth are decreased based on the designed multi-objective modeling and optimization framework.
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