Title: Cost-effectiveness oriented maintenance and inspection policy optimisation strategy for high-speed overhead contact lines

Authors: Dongkai Zhang; Kai Li; Xiaojie Sun; Jian Wang; Huiyuan Nie; Lei Kou; Meng Wang; Fei Yu

Addresses: School of Information Engineering, Henan University of Science and Technology, Luoyang 471023, China ' Wuhan Marine Machinery Plant Co., Ltd., Wuhan 430084, China ' School of Information Engineering, Henan University of Science and Technology, Luoyang 471023, China ' School of Electric Power Engineering, Kunming University of Science and Technology, Kunming 650500, China ' Yalong River Hydropower Development Company Ltd., Chengdu 610051, China ' Institute of Oceanographic Instrumentation, Qilu University of Technology (Shandong Academy of Sciences), Qingdao 266061, China ' State Grid Zhejiang Electric Power Co., Ltd., Kaihua Power Supply Company, Quzhou 330801, China ' Inner Mongolia Ultra High Voltage Power Supply Company, Hohhot 010080, China

Abstract: The safety and stability of overhead contact lines (OCLs) are playing promising role in guaranteeing the economic and efficient operation of high-speed railway trains. In this paper, a cost-effectiveness oriented maintenance and inspection policy optimisation strategy is proposed, from a trade-off between the cost and OCLs performance. One integrates the delay time model and age reduction factor into maintenance cost modelling of OCLs under imperfect maintenance. Under the premise of system reliability, the optimal preventive maintenance policy is optimised by minimising the maintenance cost during life cycle of OCLs and solved by enumeration method. Another incorporates the imperfect inspection into inspection schedule modelling within a single preventive maintenance (PM) cycle, taking into account various inspection methods for different equipment defects. The optimal inspection time and methods are solved using a branch-and-cut global optimisation approach. The actual railway line is used to demonstrate the effectiveness of the proposed PM and inspection policy optimisation model.

Keywords: preventive maintenance; delay time; reliability; imperfect inspection; multiple defect types; multiple inspection methods; overhead contact lines; OCLs.

DOI: 10.1504/IJBIC.2025.149078

International Journal of Bio-Inspired Computation, 2025 Vol.26 No.2, pp.89 - 101

Received: 16 Dec 2024
Accepted: 09 Jun 2025
Published online: 13 Oct 2025 *

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