Vibration analysis of a hydro generator for different operating regimes

Haţiegan, Cornel; Pădureanu, I; Jurcu, M; Nedeloni, Marian Dumitru; Hamat, Codruta Oana; Chioncel, Cristian Paul; Trocaru, S; Vasile, Ovidiu; Bădescu, O; Micliuc, D; Nedeloni, L; Băra, A; Haţiegan, L

doi:10.1088/1757-899x/163/1/012030

Cited by 7 publications

(6 citation statements)

References 2 publications

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“…Coupled dynamic mathematical models are developed, which consist of mutually coupled foundation vibrations, external random excitation of foundation, besides classical dynamics of nonlinear hydrogenerator shaft system. Mathematical models have been developed for malfunctions that may occur due to vibration [19][20][21][22]. The vibration-related problems observed in a Karkamış hydroelectric power plant with a river-type bulb turbine in Turkey, and the studies carried out to solve them are presented in this article.…”

Section: Introductionmentioning

confidence: 99%

Prediction of Vibration in the Discharge Ring of a River Type Hydroelectric Power Plant with Bulb Turbine Using Artificial Neural Networks and Support Vector Machine

2022

Teh. vjesn.

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Cracks are formed around the manhole covers located in the discharge ring areas of the turbine units of a hydroelectric power plant with a river-type bulb turbine due to the vibration of the units. Determining the operating parameters for the low vibration zone of the units to reduce or eliminate these cracks is an important issue in terms of reducing plant operating efficiency and maintenance costs. To solve this problem and to determine the central operating parameters in the safe vibration zone, a vibration prediction model was created with artificial neural networks and support vector machine. Operating parameters of the hydroelectric power plant; artificial neural networks and support vector machine were created to predict vibrations for each turbine unit using the water inlet-outlet height, network pollution level, power of each unit, total unit power, and vibration data from the discharge rings of the units. Vibration estimates were made based on operating parameters and compared with actual vibration values. The results obtained showed that the operating parameters for reducing the vibration values of the turbine units of the hydroelectric power plant could be determined practically with the help of artificial neural networks and support vector machine.

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Section: Introductionmentioning

confidence: 99%

Prediction of Vibration in the Discharge Ring of a River Type Hydroelectric Power Plant with Bulb Turbine Using Artificial Neural Networks and Support Vector Machine

2022

Teh. vjesn.

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“…Considering frequent malfunctioning issues at a hydraulic turbine are bearing related we made in the present paper a vibration analysis of different case studies consisting in tests were sliding bearings having different characteristics were used [1][2][3][4][5][6][7]. When building experimental stand we took into account main conditions the subassembly components should satisfy, as: high wear, corrosion and fatigue resistance, bearing must have two to four times less resistance than shaft, high stiffness, friction coefficient as low as possible, good lubricating conditions and thermal conductivity, simple and low cost maintenance, small differences between dilatations of bearing elements in order to remain close to the initial clearance [8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

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confidence: 99%

Vibration Study for a Subassembly – Part of Hydraulic Turbines

Haţiegan

Stroia

Raduca

2019

International Conference KNOWLEDGE-BASED ORGANIZATION

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A common problem with hydraulic turbines is the rupture of turbine horizontal shaft in the area between the rotor and its bearing, caused by different stresses [1], as well as problems caused by excessive bearing wear, vibration caused by instability of lubricant film from bearings, lubrication supply interruption of hydrodynamic bearings, gripping, decrease of bearing stiffness due to fatigue of supporting structures. In addition, during operation, vibration appear depending on exciter forces or bearing type. In present paper we present an analysis of vibrations measured on a subassembly found at hydraulic turbines. For the experimental subassembly was used a straight-lined shaft, having variable cross-section, and a sliding type bearing. The tests were made for bearings of different dimensions and materials. Vibrations were measured on two axes for established case studies and results were compared.

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“…A factor that determines how high a generator vibrates is its loading condition. Vibration on no-load condition differs to that on load condition [11], [12], [13]. Considering two loading conditions have been mentioned above, vibration of a generator on linear loading condition will be different to that on non-linear loading condition.…”

Section: Introductionmentioning

confidence: 99%

Effect of load current harmonics on vibration of three-phase generator

Kastawan

2018

MATEC Web Conf.

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Almost all today electrical loads are considered non-linear such as switch mode power supply (SMPS) for powering computer and mobile phone or variable speed drive (VSD) for driving home and industrial electric motors. These loads generate ac non-sinusoidal current containing a lot of harmonics as indicated by its high total harmonics distortion (THD) figure. Current harmonics bring negative effects into all electrical power system components, including three-phase generator. This paper provides analysis of load current harmonics effects on vibration of three-phase generator. Three different laboratory experiments have been conducted i.e. three-phase linear resistive loading, non-linear loading with a three-phase ac/dc converter and non-linear loading with three single-phase capacitor filtered ac/dc converters. Results show that the higher load current harmonics content the higher is vibration of the three-phase generator. Non-linear loading with a three-phase ac/dc converter that generate about 24.7% THD gives an increase of 4.3% and 5.5% in average of vertical and horizontal vibrations of the three-phase generator respectively. Further, non-linear loading with three single-phase capacitor filtered ac/dc converters that generate THD as high as 74.9% gives significant increase of 28.1% and 23.6% in average of vertical and horizontal vibrations respectively.

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Vibration analysis of a hydro generator for different operating regimes

Cited by 7 publications

References 2 publications

Prediction of Vibration in the Discharge Ring of a River Type Hydroelectric Power Plant with Bulb Turbine Using Artificial Neural Networks and Support Vector Machine

Prediction of Vibration in the Discharge Ring of a River Type Hydroelectric Power Plant with Bulb Turbine Using Artificial Neural Networks and Support Vector Machine

Vibration Study for a Subassembly – Part of Hydraulic Turbines

Effect of load current harmonics on vibration of three-phase generator

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