Preventive Maintenance Strategies that Consider Reversible Deterioration Grading

doi:10.3901/JME.2025.22.028

Abstract

Abstract: In order to prolong the service life of the system, based on the characteristic that the system deterioration can be reversed to varying degrees, it is proposed to decompose the deterioration into reversible deterioration and irreversible deterioration, and take the amount of reversible deterioration that can be eliminated by preventive maintenance（PM） as the basis for classification of PM grades. Combining the increasing factor of system failure rate and decreasing factor of service age, taking the total running time before replacement as the optimization objective, the lowest PM interval time and reliability threshold as the constraint conditions, the grade of each preventive maintenance is determined by economic analysis, and a multi-level preventive maintenance model based on reversible deterioration grading is established. Finally, taking the electrical control system of a CNC machine tool as an example, the effectiveness of the proposed strategy is verified by numerical analysis. The results show that, compared with PM without considering reversible deterioration, the multi-level PM strategy considering reversible deterioration can extend the total running time of machine tool electrical system to 19.21%, and for high-output equipment that pays attention to output value, the significant increase of running time is far more important than the small reduction of cost; At the same time, the change of irreversible deterioration has obvious influence on the reliability of machine tools:the lower the proportion of irreversible deterioration, the later the system reliability threshold arrives, and the maintenance interval increases.

Key words: reliability constraints, multi-level preventive maintenance, irreversible deterioration, reversible deterioration, total operating time

CLC Number:

TG659
TB114

WANG Zhiming, ZHANG Xinyong. Preventive Maintenance Strategies that Consider Reversible Deterioration Grading[J]. Journal of Mechanical Engineering, 2025, 61(22): 28-35.

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