Destruction of the hydraulic unit shaft: Why it is possible?

Hydraulic units produce around 20% from the total world energy and almost 75% from total renewable energy as well as play a vital role in providing energy system stability. The shaft is one of the key lifetime-determining elements for hydraulic units. Its durability, lifetime, fatigue and fracture r...

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Autor principal:	Evgeniia Georgievskaia
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Hydraulic unit Shaft Fatigue Fracture Crack Lifetime Mechanics of engineering. Applied mechanics TA349-359 Technology T
Acceso en línea:	https://doaj.org/article/c963819c11dc4b479902a7d50089f2aa
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spelling	oai:doaj.org-article:c963819c11dc4b479902a7d50089f2aa2021-11-18T04:51:54ZDestruction of the hydraulic unit shaft: Why it is possible?2666-359710.1016/j.finmec.2021.100026https://doaj.org/article/c963819c11dc4b479902a7d50089f2aa2021-10-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S2666359721000172https://doaj.org/toc/2666-3597Hydraulic units produce around 20% from the total world energy and almost 75% from total renewable energy as well as play a vital role in providing energy system stability. The shaft is one of the key lifetime-determining elements for hydraulic units. Its durability, lifetime, fatigue and fracture resistance define reliability and safety of a hydraulic unit in general. Despite the presence of functioning continuous and periodic hydraulic unit technical condition control systems, there are several known cases of shaft destruction leading to their replacement, long downtimes and significant financial losses for energy industries.The goal of this research is determining main reasons for shaft destruction in hydraulic power plant operating conditions. Using computational modeling for a large vertical high-head hydraulic unit as an example shows that a growing crack doesn't significantly influence shaft dynamic properties. As a result, even a long through crack may escape detection by present vibration diagnostics systems. At the same time, non-destructive metal state control methods are also not always effective due to structural design features and large size of hydraulic unit shafts.To prevent serious incidents in the future there is a suggestion to improve vibration diagnostics data-processing algorithms, introducing an additional diagnostic sign – a ratio of registered double rotation frequency runout values to runouts at rotation frequency, which allows to identify a hydraulic unit with a growing shaft circumferential crack even with vibration state meeting compliance norms and requirements. Additionally, it is necessary to estimate residual HU shaft lifetime through calculation taking into account possible initial cracks not revealed previously by non-destructive control.Evgeniia GeorgievskaiaElsevierarticleHydraulic unitShaftFatigueFractureCrackLifetimeMechanics of engineering. Applied mechanicsTA349-359TechnologyTENForces in Mechanics, Vol 4, Iss , Pp 100026- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Hydraulic unit Shaft Fatigue Fracture Crack Lifetime Mechanics of engineering. Applied mechanics TA349-359 Technology T
spellingShingle	Hydraulic unit Shaft Fatigue Fracture Crack Lifetime Mechanics of engineering. Applied mechanics TA349-359 Technology T Evgeniia Georgievskaia Destruction of the hydraulic unit shaft: Why it is possible?
description	Hydraulic units produce around 20% from the total world energy and almost 75% from total renewable energy as well as play a vital role in providing energy system stability. The shaft is one of the key lifetime-determining elements for hydraulic units. Its durability, lifetime, fatigue and fracture resistance define reliability and safety of a hydraulic unit in general. Despite the presence of functioning continuous and periodic hydraulic unit technical condition control systems, there are several known cases of shaft destruction leading to their replacement, long downtimes and significant financial losses for energy industries.The goal of this research is determining main reasons for shaft destruction in hydraulic power plant operating conditions. Using computational modeling for a large vertical high-head hydraulic unit as an example shows that a growing crack doesn't significantly influence shaft dynamic properties. As a result, even a long through crack may escape detection by present vibration diagnostics systems. At the same time, non-destructive metal state control methods are also not always effective due to structural design features and large size of hydraulic unit shafts.To prevent serious incidents in the future there is a suggestion to improve vibration diagnostics data-processing algorithms, introducing an additional diagnostic sign – a ratio of registered double rotation frequency runout values to runouts at rotation frequency, which allows to identify a hydraulic unit with a growing shaft circumferential crack even with vibration state meeting compliance norms and requirements. Additionally, it is necessary to estimate residual HU shaft lifetime through calculation taking into account possible initial cracks not revealed previously by non-destructive control.
format	article
author	Evgeniia Georgievskaia
author_facet	Evgeniia Georgievskaia
author_sort	Evgeniia Georgievskaia
title	Destruction of the hydraulic unit shaft: Why it is possible?
title_short	Destruction of the hydraulic unit shaft: Why it is possible?
title_full	Destruction of the hydraulic unit shaft: Why it is possible?
title_fullStr	Destruction of the hydraulic unit shaft: Why it is possible?
title_full_unstemmed	Destruction of the hydraulic unit shaft: Why it is possible?
title_sort	destruction of the hydraulic unit shaft: why it is possible?
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/c963819c11dc4b479902a7d50089f2aa
work_keys_str_mv	AT evgeniiageorgievskaia destructionofthehydraulicunitshaftwhyitispossible
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Destruction of the hydraulic unit shaft: Why it is possible?

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