Abstract: In order to solve the difficult problem of optimizing the ventilation system reform plan of Gaofeng mine,taking the optimization and transformation of ventilation system in Gaofeng mine as the research background,numerical simulation and mathematical analysis were used to optimize the ventilation system transformation scheme.Firstly,Ventsim software was used to solve the ventilation network of the three transformation schemes,and the characteristic parameter values of the ventilation system were obtained.On this basis,the evaluation index system of ventilation system transformation scheme optimization in Gaofeng mine was constructed,and the game theory is introduced to combine the subjective weight and objective weight of each index determined by DAHP method and entropy weight method,so as to obtain the comprehensive weight value of each index.Finally,the highest integral method in the multiobjective decision method is used to optimize the three schemes,and the third scheme is determined to be the optimal scheme,which provides guidance for the optimization and transformation of ventilation system in Gaofeng mine.

Key words: multiobjective decision,ventilation system,numerical simulation,scheme optimization