With a purpose of the minimum gear tooth width and the smallest planetary gear train volume

a fuzzy reliability of system-level optimization method is proposed to solve problems of the short life and insufficient flexibility of electric wheel planetary gear train of the mining dump truck.Considering the uncertainty and ambiguity of an optimization process affect the reliability of the electric wheel planetary gear train

a system-level optimization model is established for the target coupling variable

system design variable and global shared variable.According to load level

degree of environmental

technologic level and operation cycle of the electric wheel planetary gear train of the mining dump truck

the weight set of fuzzy set theory is established.Before drawing a conclusion of fuzzy weight vector

an integrated evaluation of factors that affect the reliability of the planetary gear train and constructs fuzzy evaluation matrix is presented.A fuzzy reliability system-level optimization method is used for the narrowest gear tooth width and the smallest planetary gear train.The result shows that

with the optimal solution for the fuzzy reliability system-level optimization method

the reliability of the system is raised

the volume of the mining dump truck planetary gear train is reduced and the planetary gear train is more compact.An example of electric wheel planetary gear train of a mine car is taken to prove that the method is available.