Urban rail transit vehicle base maintenance resource sharing optimization method

The invention provides an urban rail transit vehicle base maintenance resource sharing optimization method, which comprises the following steps of S1, analyzing an urban rail transit vehicle base maintenance resource sharing problem, and summarizing the urban rail transit vehicle base maintenance resource sharing problem as a multi-facility site selection-allocation problem; s2, on the basis of a line network topological structure, searching an optimal transfer path by taking the minimum transfer distance as a target under a feasible condition; s3, on the basis of the p-media model, establishing a universal constraint model for all the maintenance resources by taking the minimum value of weighted summation of the round-trip transit mileages of all the maintenance resources as a target function; s4, specific constraint models of the four vehicle base maintenance resources are established according to the respective operation characteristics of the four vehicle base maintenance resources; and S5, solving the es