ntenance; the results are consistent with the actual situation, which reflects the validity and practicality of the model.

5. Conclusion

Firstly, this paper presents a mathematical description of the maintenance of elevator equipment, and then the system failure rate function is optimized by introducing the age-dependent decrement factor and failure rate increment factor. This paper introduces improvement factors in order to break the traditional

Figure 2. The relationship between average maintenance costs and system reliability.

Table 5. Optimal maintenance intervals under the optimal preventive maintenance intervals.

assumption of periodic maintenance strategy, which is expressed as “repair as new”. The equipment condition maintenance model is constructed on the basis of reconsidering the repair costs and downtime losses of the elevator equipment. Finally, the model combined with a numerical example is solved by genetic algorithm with the aim of minimizing the average maintenance cost. The optimal equipment maintenance strategy is found and the practicality and validity of the model are verified. However, the relationship between one equipment and another is not discussed in this article, which needs to be studied in the future.

Conflicts of Interest

The authors declare no conflicts of interest.

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