# Mathematical Approach for System Repair Rate Analysis Used in Maintenance Decision Making

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## Abstract

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## 1. Introduction

## 2. Mathematical Method for System Repair Rate Analysis

## 3. Numerical Results and Discussions

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- Each UAV is supposed to have 120 flight hour per month, which further means 1440 flight hours per year;
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- MTBF for UAV’s engine is 750 flight hours, while for avionics this is 1000 h and 500 h for propeller per year.
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- Thus, based on that in [21], the failure rate was calculated as 1.92 (failures per year) for the engine, 2.88 for the propeller and 1.44 for avionics.

## 4. Conclusions

## Author Contributions

## Funding

## Institutional Review Board Statement

## Informed Consent Statement

## Acknowledgments

## Conflicts of Interest

## References

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**Figure 4.**PDF of repair rate for $\mu =max\left(\right)open="("\; close=")">{\mu}_{1},{\mu}_{2},{\mu}_{3}$.

**Figure 5.**CDF of repair rate for $\mu =max\left(\right)open="("\; close=")">{\mu}_{1},{\mu}_{2},{\mu}_{3}$.

**Figure 6.**PDF of repair rate for ${\mu}_{min}=min\left(\right)open="("\; close=")">{\mu}_{1},{\mu}_{2},{\mu}_{3}$.

**Figure 7.**CDF of repair rate for ${\mu}_{min}=min\left(\right)open="("\; close=")">{\mu}_{1},{\mu}_{2},{\mu}_{3}$.

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**MDPI and ACS Style**

Kontrec, N.; Panić, S.; Panić, B.; Marković, A.; Stošović, D.
Mathematical Approach for System Repair Rate Analysis Used in Maintenance Decision Making. *Axioms* **2021**, *10*, 96.
https://doi.org/10.3390/axioms10020096

**AMA Style**

Kontrec N, Panić S, Panić B, Marković A, Stošović D.
Mathematical Approach for System Repair Rate Analysis Used in Maintenance Decision Making. *Axioms*. 2021; 10(2):96.
https://doi.org/10.3390/axioms10020096

**Chicago/Turabian Style**

Kontrec, Nataša, Stefan Panić, Biljana Panić, Aleksandar Marković, and Dejan Stošović.
2021. "Mathematical Approach for System Repair Rate Analysis Used in Maintenance Decision Making" *Axioms* 10, no. 2: 96.
https://doi.org/10.3390/axioms10020096