On the basis of Petri net analysis of contact network system reliability, the state maintenance theory is applied to contact network system operation analysis, the reliability of contact network in each maintenance cycle is quantitatively calculated, the optimization model of contact network maintenance plan based on "reliability-maintenance cost" is established, and the multi-objective particle swarm optimization algorithm (MMOPSO) with multi-search strategy is used to optimize it. The Pareto optimal solution set is obtained by model validation in MATLAB. By making the contact network system run reliably and safely while reducing maintenance costs, it can provide reference and reference for the actual maintenance work.
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