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Reliability assessment of electromechanical module with association among reliability indicators


Nikolay Petrov1

Ventsislav Dimitrov1

Veselina Dimitrova1
1Department MEMETE, FEP of Sliven, Technical University of Sofia, Sliven, 8806, Bulgaria

Received: 24 March 2024
Revised: 28 May 2024
Accepted: 10 June 2024
Published: 30 June 2024


This paper presents the reliability assessment results for electromechanical modules, including carbon fiber reinforced composite with thermoplastic matrix, aluminium alloy, and steel housing, through the analysis of competing risks, establishing an association among reliability indicators and non-stationary failure flow using the Weibull probability density function. It has been demonstrated that the estimated probabilities of reliability operations and failure are merely approximations and may deviate from the actual values. This analysis correlates with the estimation of mutual competing risks in the operation of planetary gearbox housing constructed from composite materials. It has been confirmed that the estimated probability of failures is asymptotically effective. A comparative analysis illustrates reliance on simulation methods for planetary gearbox housing made of carbon fiber reinforced composite with a thermoplastic matrix, aluminium alloy, and steel, focusing on parameters such as von Mises stress and deformation (deflection). It has been proven that the electromechanical module, including carbon fiber reinforced composite with thermoplastic matrix, aluminium alloy, and steel planetary gearbox housing is the most reliable, with the lowest heat transfer coefficient, but with the lowest strength.


Carbon fiber reinforced composite, Composite materials, Electromechanical module, Planetary gearbox housing, Reliability, Risk in technical systems (RTS)


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© 2024 by the authors. This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License (CC BY-NC 4.0)

Volume 9
Number 1
March 2024

Last Edition

Volume 9
Number 1
March 2024

How to Cite

N. Petrov, V. Dimitrov, V. Dimitrova, Reliability Assessment of Electromechanical Module With Association Among Reliability Indicators. Applied Engineering Letters, 9(2), 2024: 85-93.

More Citation Formats

Petrov, N., Dimitrov, V., & Dimitrova, V. (2024). Reliability Assessment of Electromechanical Module With Association Among Reliability Indicators. Applied Engineering Letters, 9(2), 85-93.

Petrov, Nikolay, et al. “Reliability Assessment of Electromechanical Module With Association Among Reliability Indicators.“ Applied Engineering Letters, vol. 9, no. 2, 2024, pp. 85-93.

Petrov, Nikolay, Ventsislav Dimitrov, and Veselina Dimitrova. 2024. “Reliability Assessment of Electromechanical Module With Association Among Reliability Indicators.“ Applied Engineering Letters, 9 (2): 85-93.

Petrov, N., Dimitrov, V. and Dimitrova, V. (2024). Reliability Assessment of Electromechanical Module With Association Among Reliability Indicators. Applied Engineering Letters, 9(2), pp. 85-93.
doi: 10.46793/aeletters.2024.9.2.3.