Opportunistic Maintenance Strategy Research On Multi-component System Under Multiple Dependencies

The complex electromechanical system,such as motor vehicles,aircraft,offshore wind turbines,submarines,nuclear power plants,etc.,will cause significant loss of personnel and property if they fail;at the same time,the maintenance requirements of these systems require high standards and strict requirements.This paper takes the multi-component system as the research object,and they have the features of complex structure,fluctuation of downtime loss over time,and high requirements on safety.Firstly,the opportunistic maintenance strategy of the series system under three factors is proposed;secondly,for the hybrid system,consider the one-way fault transfer relationship,and establish a two-layer maintenance optimization model of the system;finally,considering the two-way fault transfer relationship in the hybrid system and the system security requirements,expand the two-layer maintenance model,and construct the three-layer optimization model under the effects of multiple dependencies.This paper has done the following three creative work:(1)In view of the impact of the complex structure on the fixed maintenance plan of the motor vehicle,a structural coefficient matrix is established,and a maintenance strategy for a multi-component series system is proposed.The system is under the influence of the three factors: preventive maintenance duration,minor repair duration,and economic dependence.Make short-term maintenance plan for the system,and apply rolling plans to implement dynamic updates to maintenance plans.A genetic algorithm was used to solve the examples,and the necessity and effectiveness of the proposed maintenance strategy were verified.(2)For a hybrid system with one-way fault transfer relationship,opportunistic maintenance strategy is proposed.The system is under the influence of three factors: preventive maintenance duration,one-way transmission of faults,and economic dependence.A numerical example is used to verify the necessity and effectiveness of considering maintenance time and one-way fault transfer relationship.(3)Consider the two-way transmission of faults,and improve the system maintenance cost model by the establishment of a dynamic flow factor.Combining the system security requirements and the effects of multiple dependencies,a three-level model for the opportunistic maintenance of a hybrid system was proposed.Compared with the two-layer model,the necessity of considering system security in the three-layer optimization model is verified.