Turbine wheel reduced modal model for self-excited vibration suppression by inter-blade dry-friction damping

• Autorzy: Pešek Luděk , Šnábl Pavel , Prasad Chandra Shekhar

Identyfikatory

DOI

10.24425/bpasts.2023.148250

• Języki publikacji: EN

Abstrakty

EN

A new approach to calculations based on the modal synthesis method is proposed for the evaluation of structural and dry-friction damping effects on self-excited vibrations due to aeroelastic instability in bladed turbine wheels. The method described herein is used to study dry-friction damping of self-excited vibration of an industrial turbine wheel with 66 blades. For evaluating damping effects, the blade couplings are applied to this particular turbine wheel. Therefore, neighbouring blades are interconnected by rigid arms that are fixed on one side to one blade and are in frictional contact on their free side with the other blade. Due to relatively normal motions in contacts, the prescribed contact forces vary over time. The aerodynamic excitation arises from the spatially periodical flow of steam through the stator blade cascade. In this paper, we attempt to model flow-induced instabilities with the Van der Pol model linked to relative motion between neighbouring blades. The proposed modal synthesis method as ROM is a computationally efficient solution allowing substantial parametrization. The effect of the angles of contact surfaces on the wheel dynamics and on the level of the self-excitation suppression will be discussed herein.

Słowa kluczowe

EN

blade dynamics; travelling waves; flutter; dry-friction damping; model reduction; Van der Pol

PL

dynamika ostrza; trzepotanie; tłumienie tarcia na sucho; redukcja modelu; Van der Pol; fala podróżna

• Wydawca: Polska Akademia Nauk, Wydział IV Nauk Technicznych
• Czasopismo: Bulletin of the Polish Academy of Sciences. Technical Sciences
• Rocznik: 2023
• Tom: Vol. 71, nr 6
• Strony: art. no. e148250
• Opis fizyczny: Bibliogr. 57 poz., rys., tab.

Twórcy

autor

Pešek Luděk

• Institute of Thermomechanics of the CAS, v. v. i., Dolejškova 1402/5, 182 00 Praha 8, Czech Republic

• https://orcid.org/0000-0003-0940-6771

autor

Šnábl Pavel

• Institute of Thermomechanics of the CAS, v. v. i., Dolejškova 1402/5, 182 00 Praha 8, Czech Republic

autor

Prasad Chandra Shekhar

• Institute of Thermomechanics of the CAS, v. v. i., Dolejškova 1402/5, 182 00 Praha 8, Czech Republic

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2024).