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Zenodo
2026
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| Accesso online: | https://doi.org/10.5281/zenodo.20004511 |
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| _version_ | 1866902162768920576 |
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| author | Rodrıguez-Blanco, Salvador Gonzalez-Monge, Javier Martel, Carlos |
| author_facet | Rodrıguez-Blanco, Salvador Gonzalez-Monge, Javier Martel, Carlos |
| contents | <p>The energy method is widely used for flutter stability<br>analysis of turbomachinery due to its simplicity and low<br>computational cost, relying on the evaluation of aerodynamic<br>work and structural dissipation over a vibration cycle. However,<br>in some cases, when applied to systems with nonlinear contact<br>forces, such as those at blade roots, interlocked shrouds, or<br>underplatform dampers, the method can underestimate frictional<br>energy dissipation, leading to inaccurate predictions of limit<br>cycle oscillation amplitudes. This work investigates the use of<br>the energy method to predict the flutter-saturated response of<br>low-pressure turbine rotors with nonlinear friction interfaces.<br>To assess these limitations, two structural representations<br>are considered: a reduced-order mass–spring model and a<br>detailed finite element model of a realistic LPT rotor. In both<br>cases, the results are compared with reference solutions obtained<br>from direct time-integration simulations. For configurations<br>where the standard formulation fails, a corrected approach that<br>accounts for nonlinear structural effects in the contact regions<br>is proposed. This correction significantly improves agreement<br>with reference solutions for the detailed realistic model while<br>preserving the computational efficiency. The equations of the<br>standard and the corrected energy methods are consistently<br>derived using asymptotic techniques from both bladed-disk<br>models.</p> |
| format | Recurso digital |
| id | zenodo_https___doi_org_10_5281_zenodo_20004511 |
| institution | Zenodo |
| language | |
| publishDate | 2026 |
| publisher | Zenodo |
| record_format | zenodo |
| spellingShingle | ON THE FORMULATION OF THE ENERGY METHOD TO COMPUTE FLUTTER SATURATED SOLUTIONS Rodrıguez-Blanco, Salvador Gonzalez-Monge, Javier Martel, Carlos Turbomachinery Propulsion Aeromechanics <p>The energy method is widely used for flutter stability<br>analysis of turbomachinery due to its simplicity and low<br>computational cost, relying on the evaluation of aerodynamic<br>work and structural dissipation over a vibration cycle. However,<br>in some cases, when applied to systems with nonlinear contact<br>forces, such as those at blade roots, interlocked shrouds, or<br>underplatform dampers, the method can underestimate frictional<br>energy dissipation, leading to inaccurate predictions of limit<br>cycle oscillation amplitudes. This work investigates the use of<br>the energy method to predict the flutter-saturated response of<br>low-pressure turbine rotors with nonlinear friction interfaces.<br>To assess these limitations, two structural representations<br>are considered: a reduced-order mass–spring model and a<br>detailed finite element model of a realistic LPT rotor. In both<br>cases, the results are compared with reference solutions obtained<br>from direct time-integration simulations. For configurations<br>where the standard formulation fails, a corrected approach that<br>accounts for nonlinear structural effects in the contact regions<br>is proposed. This correction significantly improves agreement<br>with reference solutions for the detailed realistic model while<br>preserving the computational efficiency. The equations of the<br>standard and the corrected energy methods are consistently<br>derived using asymptotic techniques from both bladed-disk<br>models.</p> |
| title | ON THE FORMULATION OF THE ENERGY METHOD TO COMPUTE FLUTTER SATURATED SOLUTIONS |
| topic | Turbomachinery Propulsion Aeromechanics |
| url | https://doi.org/10.5281/zenodo.20004511 |