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Research Papers: Gas Turbines: Structures and Dynamics

Accurate Characterization of Torsional Stiffness of Flexible Disk Couplings

[+] Author and Article Information
Alex Francis

Mem. ASME
Department of Mechanical Engineering,
University of Wisconsin Milwaukee,
3200 N Cramer Street,
Milwaukee, WI 53211
e-mail: francis@uwm.edu

Ilya Avdeev

Mem. ASME
Department of Mechanical Engineering,
University of Wisconsin Milwaukee,
3200 N Cramer Street,
Milwaukee, WI 53211
e-mail: avdeev@uwm.edu

Joseph Hamann

Rexnord Innovation Center,
5101 West Beloit Road,
Milwaukee, WI 53214
e-mail: Joseph.Hamann@Rexnord.com

Sundar Ananthasivan

Rexnord—Global Couplings Engineering,
5555 S. Moorland Road,
New Berlin, WI 53151
e-mail: Sundar.Ananthasivan@rexnord.com

1Corresponding author.

Contributed by the Structures and Dynamics Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received October 28, 2014; final manuscript received November 26, 2014; published online January 28, 2015. Editor: David Wisler.

J. Eng. Gas Turbines Power 137(8), 082504 (Aug 01, 2015) (8 pages) Paper No: GTP-14-1606; doi: 10.1115/1.4029392 History: Received October 28, 2014; Revised November 26, 2014; Online January 28, 2015

Flexible torsional couplings are used primarily to transmit power between rotating components in industrial power systems, including turbomachinery, while allowing for small amounts of misalignment that may otherwise lead to equipment failure. The torsional coupling lumped characteristics, such as torsional- and flexural stiffness, as well as natural frequencies of vibration are important for design of the entire power system and, therefore, must be calculated or computed with a high degree of accuracy. In this paper, we compare theoretical-, computational-, and experimental methods of characterizing torsional stiffness of a family of metallic disk type flexible couplings. We demonstrate the sensitivity of torsional stiffness to various design parameters and characterization assumptions, including boundary conditions, level of model detail, and material properties of the coupling's components. We also develop a full 3D parametric finite element model of the coupling and report on its experimental validation.

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Figures

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Fig. 1

3D CAD model of the Rexnord's CMR-1100 flexible disk coupling

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Fig. 2

Simplified analytical model [3,6]. (a) Axisymmetric geometry and (b) spring model.

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Fig. 3

Cross section of a rigid coupling axisymmetric model [3]

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Fig. 4

Axisymmetric representation of the CMR coupling assembly

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Fig. 5

Automated workflow (from input parameters to FEA results)

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Fig. 6

Torsional stiffness FEM characterization using method #1. (a) Model geometry/mesh and (b) loads and constraints.

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Fig. 7

Torsional stiffness FEM characterization using method #2. (a) Model geometry/mesh and (b) loads and constraints.

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Fig. 8

Simplified FEM representation of the coupling assembly (axisymmetric representation of each component)

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Fig. 9

ansys simulation results (method #1). (a) von Mises stress and (b) total displacement.

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Fig. 10

ansys simulation results (method #2). (a) von Mises stress and (b) total displacement.

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Fig. 11

Sensitivity of the absolute change in material property value of each component on torsional stiffness

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Fig. 12

Influence of number of disks (overall pack thickness) on KT

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Fig. 13

Experimental setup and indicator placements

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