To improve the problem that the conventional design results of planetary gear transmission could not guarantee all of objectives were the optimal. aiming at the shortcomings that adaptive particle swarm optimization algorithm easily produced infeasible solution and fell into local optimum. an adaptive particle swarm optimization algorithm based on multi-level penalty function with dyn... https://www.spidertattooz.com/NYX-Total-Control-Drop-Foundation-Brush-PROB22-p11165/