This study examines the frequency characteristics of thin rotating disks subjected to axisymmetric nonflatness. The equations of motion used are based on Von Karman’s plate theory. First, the eigenfunctions of the stationary disk problem corresponding to the stress function and transverse displacement are found. These eigenfunctions produce an equation that can be used in Galerkin’s method. The initial nonflatness is assumed to be a linear combination of the eigenfunctions of the transverse displacement of the stationary disk problem. Since the initial nonflatness is assumed to be axisymmetric, only eigenfunctions with no nodal diameters are considered to approximate the initial runout. It is supposed that the disk bending deflection is small compared with disk thickness, so we can ignore the second-order terms in the governing equations corresponding to the transverse displacement and the stress function. After simplifying and discretizing the governing equations of motion, we can obtain a set of coupled equations of motion, which takes the effect of the initial axisymmetric runout into account. These equations are then used to study the effect of the initial runout on the frequency behavior of the stationary disk. It is found that the initial runout increases the frequencies of the oscillations of a stationary disk. In the next step, we study the effect of the initial nonflatness on the critical speed behavior of a spinning disk.
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October 2010
Research Papers
The Effect of Axisymmetric Nonflatness on the Oscillation Frequencies of a Rotating Disk
Ramin M. H. Khorasany,
Ramin M. H. Khorasany
Department of Mechanical Engineering,
e-mail: raminkh@mech.ubc.ca
The University of British Columbia
, Vancouver, BC, V6T 1Z4, Canada
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Stanley G. Hutton
Stanley G. Hutton
Department of Mechanical Engineering,
The University of British Columbia
, Vancouver, BC, V6T 1Z4, Canada
Search for other works by this author on:
Ramin M. H. Khorasany
Department of Mechanical Engineering,
The University of British Columbia
, Vancouver, BC, V6T 1Z4, Canadae-mail: raminkh@mech.ubc.ca
Stanley G. Hutton
Department of Mechanical Engineering,
The University of British Columbia
, Vancouver, BC, V6T 1Z4, CanadaJ. Vib. Acoust. Oct 2010, 132(5): 051012 (8 pages)
Published Online: September 1, 2010
Article history
Received:
November 7, 2009
Revised:
March 23, 2010
Online:
September 1, 2010
Published:
September 1, 2010
Citation
Khorasany, R. M. H., and Hutton, S. G. (September 1, 2010). "The Effect of Axisymmetric Nonflatness on the Oscillation Frequencies of a Rotating Disk." ASME. J. Vib. Acoust. October 2010; 132(5): 051012. https://doi.org/10.1115/1.4001516
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