Reliability Assessment of Aircraft Commutators

The article describes the method of predicting the reliability and durability of an aircraft commutator, which is a primary source of electric energy in helicopters. Tests were conducted for 10 starter-generators. From this research it follows that the technical condition of brushes and bearings has...

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Autores principales:	Wojciech Wawrzyński, Mariusz Zieja, Justyna Tomaszewska, Mariusz Michalski
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	aircraft starter-generator commutator device differential equations Fokker–Planck equation Technology T
Acceso en línea:	https://doaj.org/article/62482dce5e8f4e5190a1fa8b401e7a83
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id	oai:doaj.org-article:62482dce5e8f4e5190a1fa8b401e7a83
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spelling	oai:doaj.org-article:62482dce5e8f4e5190a1fa8b401e7a832021-11-11T16:07:11ZReliability Assessment of Aircraft Commutators10.3390/en142174041996-1073https://doaj.org/article/62482dce5e8f4e5190a1fa8b401e7a832021-11-01T00:00:00Zhttps://www.mdpi.com/1996-1073/14/21/7404https://doaj.org/toc/1996-1073The article describes the method of predicting the reliability and durability of an aircraft commutator, which is a primary source of electric energy in helicopters. Tests were conducted for 10 starter-generators. From this research it follows that the technical condition of brushes and bearings has a significant impact on the reliability of starter-generators. The reliability of starter-generators was determined based on the method consisting of two stages that was adopted: the first stage involved determining the density function of changes in diagnostic parameter depending on the operating time, but the second stage included the assessment of the reliability of bearings of the starter-generator taking into account the real flight profile. The first stage of the adopted method consisted of defining the dynamic model of changing the length of the starter-generator’s brush, which became the probabilistic model. Subsequently, based on differential equations, Fokker–Planck partial differential equation was derived, which describes the process of increasing the brush wear in a probabilistic way. This method enables the prediction of the residual durability of the helicopter’s starter-generator due to the change in a diagnostic parameter which is the wear of brushes during starter-generator operation. The second stage of this method allows determining the durability of starter-generator’s bearings building upon the average helicopter’s flight profile. Owing to the difficulty in measuring the wear of bearings, the relation between the durability of bearings and the temperature of surroundings can be applied by replacing the flight altitude with temperature. The reliability of the helicopter’s starter-generator was determined based on the serial-type reliability structure.Wojciech WawrzyńskiMariusz ZiejaJustyna TomaszewskaMariusz MichalskiMDPI AGarticleaircraftstarter-generatorcommutator devicedifferential equationsFokker–Planck equationTechnologyTENEnergies, Vol 14, Iss 7404, p 7404 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	aircraft starter-generator commutator device differential equations Fokker–Planck equation Technology T
spellingShingle	aircraft starter-generator commutator device differential equations Fokker–Planck equation Technology T Wojciech Wawrzyński Mariusz Zieja Justyna Tomaszewska Mariusz Michalski Reliability Assessment of Aircraft Commutators
description	The article describes the method of predicting the reliability and durability of an aircraft commutator, which is a primary source of electric energy in helicopters. Tests were conducted for 10 starter-generators. From this research it follows that the technical condition of brushes and bearings has a significant impact on the reliability of starter-generators. The reliability of starter-generators was determined based on the method consisting of two stages that was adopted: the first stage involved determining the density function of changes in diagnostic parameter depending on the operating time, but the second stage included the assessment of the reliability of bearings of the starter-generator taking into account the real flight profile. The first stage of the adopted method consisted of defining the dynamic model of changing the length of the starter-generator’s brush, which became the probabilistic model. Subsequently, based on differential equations, Fokker–Planck partial differential equation was derived, which describes the process of increasing the brush wear in a probabilistic way. This method enables the prediction of the residual durability of the helicopter’s starter-generator due to the change in a diagnostic parameter which is the wear of brushes during starter-generator operation. The second stage of this method allows determining the durability of starter-generator’s bearings building upon the average helicopter’s flight profile. Owing to the difficulty in measuring the wear of bearings, the relation between the durability of bearings and the temperature of surroundings can be applied by replacing the flight altitude with temperature. The reliability of the helicopter’s starter-generator was determined based on the serial-type reliability structure.
format	article
author	Wojciech Wawrzyński Mariusz Zieja Justyna Tomaszewska Mariusz Michalski
author_facet	Wojciech Wawrzyński Mariusz Zieja Justyna Tomaszewska Mariusz Michalski
author_sort	Wojciech Wawrzyński
title	Reliability Assessment of Aircraft Commutators
title_short	Reliability Assessment of Aircraft Commutators
title_full	Reliability Assessment of Aircraft Commutators
title_fullStr	Reliability Assessment of Aircraft Commutators
title_full_unstemmed	Reliability Assessment of Aircraft Commutators
title_sort	reliability assessment of aircraft commutators
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/62482dce5e8f4e5190a1fa8b401e7a83
work_keys_str_mv	AT wojciechwawrzynski reliabilityassessmentofaircraftcommutators AT mariuszzieja reliabilityassessmentofaircraftcommutators AT justynatomaszewska reliabilityassessmentofaircraftcommutators AT mariuszmichalski reliabilityassessmentofaircraftcommutators
_version_	1718432417543356416

Reliability Assessment of Aircraft Commutators

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