Comparison of Empty and Oil-Filled Transformer Tank Mode Shapes Using Experimental and FEM Modal Analysis
In this paper, the mode shapes of an empty and oil-filled transformer experimental model tank are obtained using 3D finite element method (FEM) modal analysis. For verification of the FEM analysis results, experimental modal analysis (EMA) is carried out in both cases using appropriate impact hammer...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2024-01-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/17/3/589 |
| _version_ | 1797318887689158656 |
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| author | Karlo Petrović Danilo Dobrić Ivan Gotić Tomislav Župan |
| author_facet | Karlo Petrović Danilo Dobrić Ivan Gotić Tomislav Župan |
| author_sort | Karlo Petrović |
| collection | DOAJ |
| description | In this paper, the mode shapes of an empty and oil-filled transformer experimental model tank are obtained using 3D finite element method (FEM) modal analysis. For verification of the FEM analysis results, experimental modal analysis (EMA) is carried out in both cases using appropriate impact hammers and accelerometers. Simulated and measured results are visualized and compared for mode shapes in a frequency range of interest for both empty and oil-filled tanks. In order to avoid overly stiff FEM models of transformer tanks, the welded joint modeling technique is presented and analyzed in detail. For an oil-filled tank, the most accurate results are calculated in the model where the welded joint is modeled as half the tank wall’s thickness. In that case, the mean absolute error for the given ten-mode shapes is 1.7 Hz. Also, mesh sensitivity analysis is performed. It is concluded that a 10 mm maximum element size is an optimal solid (3D) mesh. However, shell mesh can be used to reduce computing requirements. |
| first_indexed | 2024-03-08T03:57:59Z |
| format | Article |
| id | doaj.art-bb222625e0494e2aaea345d1a36adc2b |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-08T03:57:59Z |
| publishDate | 2024-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-bb222625e0494e2aaea345d1a36adc2b2024-02-09T15:11:12ZengMDPI AGEnergies1996-10732024-01-0117358910.3390/en17030589Comparison of Empty and Oil-Filled Transformer Tank Mode Shapes Using Experimental and FEM Modal AnalysisKarlo Petrović0Danilo Dobrić1Ivan Gotić2Tomislav Župan3Končar—Electrical Engineering Institute Ltd., 10000 Zagreb, CroatiaStudent at Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb, 10000 Zagreb, CroatiaKončar—Electrical Engineering Institute Ltd., 10000 Zagreb, CroatiaKončar—Electrical Engineering Institute Ltd., 10000 Zagreb, CroatiaIn this paper, the mode shapes of an empty and oil-filled transformer experimental model tank are obtained using 3D finite element method (FEM) modal analysis. For verification of the FEM analysis results, experimental modal analysis (EMA) is carried out in both cases using appropriate impact hammers and accelerometers. Simulated and measured results are visualized and compared for mode shapes in a frequency range of interest for both empty and oil-filled tanks. In order to avoid overly stiff FEM models of transformer tanks, the welded joint modeling technique is presented and analyzed in detail. For an oil-filled tank, the most accurate results are calculated in the model where the welded joint is modeled as half the tank wall’s thickness. In that case, the mean absolute error for the given ten-mode shapes is 1.7 Hz. Also, mesh sensitivity analysis is performed. It is concluded that a 10 mm maximum element size is an optimal solid (3D) mesh. However, shell mesh can be used to reduce computing requirements.https://www.mdpi.com/1996-1073/17/3/589mode shapesFEM modal analysistransformer tankexperimental modal analysis |
| spellingShingle | Karlo Petrović Danilo Dobrić Ivan Gotić Tomislav Župan Comparison of Empty and Oil-Filled Transformer Tank Mode Shapes Using Experimental and FEM Modal Analysis Energies mode shapes FEM modal analysis transformer tank experimental modal analysis |
| title | Comparison of Empty and Oil-Filled Transformer Tank Mode Shapes Using Experimental and FEM Modal Analysis |
| title_full | Comparison of Empty and Oil-Filled Transformer Tank Mode Shapes Using Experimental and FEM Modal Analysis |
| title_fullStr | Comparison of Empty and Oil-Filled Transformer Tank Mode Shapes Using Experimental and FEM Modal Analysis |
| title_full_unstemmed | Comparison of Empty and Oil-Filled Transformer Tank Mode Shapes Using Experimental and FEM Modal Analysis |
| title_short | Comparison of Empty and Oil-Filled Transformer Tank Mode Shapes Using Experimental and FEM Modal Analysis |
| title_sort | comparison of empty and oil filled transformer tank mode shapes using experimental and fem modal analysis |
| topic | mode shapes FEM modal analysis transformer tank experimental modal analysis |
| url | https://www.mdpi.com/1996-1073/17/3/589 |
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