Experimental study on the detection of vibrations of an operating turbine runner with sensors on the casing
Hydraulic turbine runners experience strong vibrations in operation, especially when resonances between runner natural frequencies and hydraulic excitations occur. Precise determination of prototype runner frequencies in operation is essential, but direct measurements are costly and technically chal...
| Autores: | , , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2025 |
| País: | España |
| Institución: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2117/427058 |
| Acceso en línea: | https://hdl.handle.net/2117/427058 https://dx.doi.org/10.1016/j.measurement.2025.116773 |
| Access Level: | acceso abierto |
| Palabra clave: | Francis turbine Modal behavior Natural frequencies Piezo patches Condition monitoring Stationary sensors Àrees temàtiques de la UPC::Enginyeria mecànica::Motors::Turbines Àrees temàtiques de la UPC::Energies::Energia hidràulica |
| Sumario: | Hydraulic turbine runners experience strong vibrations in operation, especially when resonances between runner natural frequencies and hydraulic excitations occur. Precise determination of prototype runner frequencies in operation is essential, but direct measurements are costly and technically challenging. This study presents an experimental investigation on a reduced-scale Francis model to evaluate the use of non-intrusive stationary sensors to measure runner vibrations. The runner was instrumented with accelerometers and piezoelectric patches, and an accelerometer was installed on the casing. The natural frequencies of the operating runner were excited with the patches and the vibration was measured simultaneously in the rotating and stationary structures. Results prove the feasibility of monitoring runner vibrations externally and demonstrate the correlation between rotating and stationary frames. Runner natural frequencies change and split due to confined rotation. The stationary sensor measures them with a frequency shift depending on rotating speed and nodal diameters of the excited mode shape. |
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