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Modelling of a blade couple with contact in shrouding by means of Rayleigh beam finite elements

Citace:
BRŮHA, J., ZEMAN, V. Modelling of a blade couple with contact in shrouding by means of Rayleigh beam finite elements. In Computational mechanics - EXTENDED ABSTRACTS. Plzeň: Západočeská univerzita v Plzni, Univerzitní 8, 306 14 Plzeň, 2015. s. 15-16. ISBN: 978-80-261-0568-8
Druh: STAŤ VE SBORNÍKU
Jazyk publikace: eng
Anglický název: Modelling of a blade couple with contact in shrouding by means of Rayleigh beam finite elements
Rok vydání: 2015
Místo konání: Plzeň
Název zdroje: Západočeská univerzita v Plzni, Univerzitní 8, 306 14 Plzeň
Autoři: Ing. Jan Brůha , Prof. Ing. Vladimír Zeman DrSc. ,
Abstrakt EN: Presented work deals with modelling of a couple of twisted blades with rhombic shrouds (that are considered to be rigid). This blade couple is clamped into a rigid disk rotating with constant angular velocity. Either of the blades is divided into Rayleigh beam finite elements (blade finite elements) with varying cross-sectional parameters along each element and six degrees of freedom in each of the nodes. Since the finite element models based on the Rayleigh beam theory tend to slightly overrate natural frequencies and underrate deflections in comparison with finite element models including shear deformation effects, the Young?s modulus, the Poisson?s ratio and the torsion resistance of every blade finite element were being tuned. Then, a modal analysis of the rotating blade couple with smooth contact surfaces (without friction) is performed and comparison of calculated natural frequencies in dependence on rotational speed and contact stiffness between blade shrouds is shown.
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