Measurement of loads acting on a hydropower unit during stationary and transient operations

Load measurements on hydropower turbines and generators are usually expensive and troublesome due to the need of sensor installation on the rotating parts. Often a longer stop of the unit is required when the sensors are to be installed or removed from the turbine in the waterway, which results in p...

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Autores principales:	Rolf Gustavsson, Erik Isaksson
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Vertical rotor Numerical Analysis Bearing Stiffness Measurement Rotor Load Engineering (General). Civil engineering (General) TA1-2040
Acceso en línea:	https://doaj.org/article/adf887ded810491494bf727f5d477e52
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spelling	oai:doaj.org-article:adf887ded810491494bf727f5d477e522021-12-01T05:06:21ZMeasurement of loads acting on a hydropower unit during stationary and transient operations2666-496810.1016/j.apples.2021.100063https://doaj.org/article/adf887ded810491494bf727f5d477e522021-09-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S2666496821000297https://doaj.org/toc/2666-4968Load measurements on hydropower turbines and generators are usually expensive and troublesome due to the need of sensor installation on the rotating parts. Often a longer stop of the unit is required when the sensors are to be installed or removed from the turbine in the waterway, which results in production disturbances.This article presents a methodology and results for estimation of loads acting on turbines and generators during operation without installation of sensors on the turbine or in the generator. The measured quantities are shaft displacement in the bearings and the bending moment on the shaft between the turbine guide bearing and the lower generator guide bearing.To enable calculation of the loads acting on the turbine and the generator, it is necessary to have as many measurement points as the number of unknown loads acting on the shaft train. By using the displacement in the three radial bearings, six of the eight unknown forces can be determined. The remaining two unknown loads can be calculated by measuring the bending moment in the shaft connecting the generator to the turbine. In journal bearings the stiffness is a non-linear function of eccentricity, which means that the obtained stiffness function must be integrated to achieve the force as a function of the shaft eccentricity.By applying the measured time history of displacement and moment on the numerical model, the time history for the unknown loads can be solved. The time history of the external loads is then converted into load spectra.Rolf GustavssonErik IsakssonElsevierarticleVertical rotorNumerical AnalysisBearing StiffnessMeasurementRotor LoadEngineering (General). Civil engineering (General)TA1-2040ENApplications in Engineering Science, Vol 7, Iss , Pp 100063- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Vertical rotor Numerical Analysis Bearing Stiffness Measurement Rotor Load Engineering (General). Civil engineering (General) TA1-2040
spellingShingle	Vertical rotor Numerical Analysis Bearing Stiffness Measurement Rotor Load Engineering (General). Civil engineering (General) TA1-2040 Rolf Gustavsson Erik Isaksson Measurement of loads acting on a hydropower unit during stationary and transient operations
description	Load measurements on hydropower turbines and generators are usually expensive and troublesome due to the need of sensor installation on the rotating parts. Often a longer stop of the unit is required when the sensors are to be installed or removed from the turbine in the waterway, which results in production disturbances.This article presents a methodology and results for estimation of loads acting on turbines and generators during operation without installation of sensors on the turbine or in the generator. The measured quantities are shaft displacement in the bearings and the bending moment on the shaft between the turbine guide bearing and the lower generator guide bearing.To enable calculation of the loads acting on the turbine and the generator, it is necessary to have as many measurement points as the number of unknown loads acting on the shaft train. By using the displacement in the three radial bearings, six of the eight unknown forces can be determined. The remaining two unknown loads can be calculated by measuring the bending moment in the shaft connecting the generator to the turbine. In journal bearings the stiffness is a non-linear function of eccentricity, which means that the obtained stiffness function must be integrated to achieve the force as a function of the shaft eccentricity.By applying the measured time history of displacement and moment on the numerical model, the time history for the unknown loads can be solved. The time history of the external loads is then converted into load spectra.
format	article
author	Rolf Gustavsson Erik Isaksson
author_facet	Rolf Gustavsson Erik Isaksson
author_sort	Rolf Gustavsson
title	Measurement of loads acting on a hydropower unit during stationary and transient operations
title_short	Measurement of loads acting on a hydropower unit during stationary and transient operations
title_full	Measurement of loads acting on a hydropower unit during stationary and transient operations
title_fullStr	Measurement of loads acting on a hydropower unit during stationary and transient operations
title_full_unstemmed	Measurement of loads acting on a hydropower unit during stationary and transient operations
title_sort	measurement of loads acting on a hydropower unit during stationary and transient operations
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/adf887ded810491494bf727f5d477e52
work_keys_str_mv	AT rolfgustavsson measurementofloadsactingonahydropowerunitduringstationaryandtransientoperations AT erikisaksson measurementofloadsactingonahydropowerunitduringstationaryandtransientoperations
_version_	1718405564551135232

Measurement of loads acting on a hydropower unit during stationary and transient operations

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