Consideration is given to a very specific interaction phenomenon that may occur in turbomachines due to radial rub between a bladed disk and surrounding casing. These two structures, featuring rotational periodicity and axisymmetry, respectively, share the same type of eigenshapes, also termed nodal diameter traveling waves. Higher efficiency requirements leading to reduced clearance between blade-tips and casing together with the rotation of the bladed disk increase the possibility of interaction between these traveling waves through direct contact. By definition, large amplitudes as well as structural failure may be expected. A very simple two-dimensional model of outer casing and bladed disk is introduced in order to predict the occurrence of such phenomenon in terms of rotational velocity. In order to consider traveling wave motions, each structure is represented by its two -nodal diameter standing modes. Equations of motion are solved first using an explicit time integration scheme in conjunction with the Lagrange multiplier method, which accounts for the contact constraints, and then by the harmonic balance method (HBM). While both methods yield identical results that exhibit two distinct zones of completely different behaviors of the system, HBM is much less computationally expensive.
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e-mail: mathias.legrand@mcgill.ca
e-mail: christophe.pierre@mcgill.ca
e-mail: bernard.peseux@ec-nantes.fr
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October 2010
Research Papers
Structural modal interaction of a four degree-of-freedom bladed disk and casing model
Mathias Legrand,
Mathias Legrand
Institut de Recherche en Génie civil et Mécanique (GeM), UMR CNRS 6183,
e-mail: mathias.legrand@mcgill.ca
École Centrale de Nantes
, BP 92101 44321, Nantes Cedex 3, France
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Christophe Pierre,
e-mail: christophe.pierre@mcgill.ca
Christophe Pierre
McGill University
, McDonald Engineering Building, 817 Sherbrooke West, Montreal H3A 2K6, Canada
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Bernard Peseux
Bernard Peseux
Institut de Recherche en Génie civil et Mécanique (GeM), UMR CNRS 6183,
e-mail: bernard.peseux@ec-nantes.fr
École Centrale de Nantes
, BP 92101 44321, Nantes Cedex 3, France
Search for other works by this author on:
Mathias Legrand
Institut de Recherche en Génie civil et Mécanique (GeM), UMR CNRS 6183,
École Centrale de Nantes
, BP 92101 44321, Nantes Cedex 3, Francee-mail: mathias.legrand@mcgill.ca
Christophe Pierre
McGill University
, McDonald Engineering Building, 817 Sherbrooke West, Montreal H3A 2K6, Canadae-mail: christophe.pierre@mcgill.ca
Bernard Peseux
Institut de Recherche en Génie civil et Mécanique (GeM), UMR CNRS 6183,
École Centrale de Nantes
, BP 92101 44321, Nantes Cedex 3, Francee-mail: bernard.peseux@ec-nantes.fr
J. Comput. Nonlinear Dynam. Oct 2010, 5(4): 041013 (9 pages)
Published Online: August 17, 2010
Article history
Received:
March 20, 2007
Revised:
March 24, 2009
Online:
August 17, 2010
Published:
August 17, 2010
Citation
Legrand, M., Pierre, C., and Peseux, B. (August 17, 2010). "Structural modal interaction of a four degree-of-freedom bladed disk and casing model." ASME. J. Comput. Nonlinear Dynam. October 2010; 5(4): 041013. https://doi.org/10.1115/1.4001903
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