Being satisfied with the conditions of load-bearing capacity
the optimization mathematical model is set up which is to minimize the volume sum of pitch circle cylinder of gearsets.Considering the problem of low efficiency and local optimum caused by traditional optimal methods
this paper adopts Genetic Algorithm and Direct Search Toolbox of Matlab software to solve the optimization model
and applies neural networks method to fit coefficient.So that the optimization process is simplified and global optimum is acquired reliably.