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Improvement of the Calculation of Hydrodynamic Systems by Considering the Dynamic Deformation Caused by Vibration

[+] Author Affiliations
Sebastian Kukla, Tim Sadek

Ruhr-University Bochum, Bochum, Germany

Paper No. DETC2011-47302, pp. 1263-1267; 5 pages
doi:10.1115/DETC2011-47302
From:
  • ASME 2011 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference
  • Volume 1: 23rd Biennial Conference on Mechanical Vibration and Noise, Parts A and B
  • Washington, DC, USA, August 28–31, 2011
  • Conference Sponsors: Design Engineering Division and Computers and Information in Engineering Division
  • ISBN: 978-0-7918-5478-5
  • Copyright © 2011 by ASME

abstract

In order to improve the calculation of stiffness and damping coefficients (SDC) for hydrodynamic systems, this paper proposes the consideration of both static and dynamic deformations of the running surface. Dynamic deformations are caused by rotor vibration and corresponding unbalanced forces. A lubrication wedge was used to exemplify the significant influence of these dynamic deformations in SDC calculations. This basic hydrodynamic system was calculated considering material elasticity. First of all, an influence coefficient matrix, which describes the correlation of pressure and deformation, was calculated with the finite element program ANSYS. Using this matrix, small dynamic deformations of the running surface were considered in solving the Reynolds equation for the lubrication wedge. The analysis of the vibration response of this basic hydrodynamic system considering elastic material deformation demonstrated that both static and dynamic components of deflection significantly affect the SDC. These coefficients were also proved to be highly dependent on the stimulation frequency.

Copyright © 2011 by ASME

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