Research Papers: Gas Turbines: Structures and Dynamics

Modeling of Flange Joints for the Nonlinear Dynamic Analysis of Gas Turbine Engine Casings

[+] Author and Article Information
C. W. Schwingshackl

Imperial College London,
London, United Kingdom
e-mail: c.schwingshackl@imperial.ac.uk

E. P. Petrov

University of Sussex,
Brighton, United Kingdom
e-mail: y.petrov@sussex.ac.uk

Contributed by the International Gas Turbine Institute (IGTI) of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received June 26, 2012; final manuscript received July 2, 2012; published online October 11, 2012. Editor: Dilip R. Ballal.

J. Eng. Gas Turbines Power 134(12), 122504 (Oct 11, 2012) (9 pages) doi:10.1115/1.4007342 History: Received June 26, 2012; Revised July 02, 2012

The finite element analysis of individual components of aircraft engine casings provides high accuracy and a good agreement with the measured response data. However, when these components are assembled, the accuracy of such predictions can significantly deteriorate since models describing stiffness and friction properties of joints are linearized. A full nonlinear analysis of the casing flanges is required to fully include the influence of the bolted joints, model the flexibility in the contact interface, and consider the nonlinear behavior of the contact due to partial slip and separation. In this paper different nonlinear models of casings are investigated with an available nonlinear analysis tool: A parametric study of the contact interface meshes is conducted to identify a satisfying analysis approach. The dynamic flange behavior is analyzed in detail, including effects of the bolt and normal load distribution. A comparison of the introduced nonlinear modeling with more traditional rigid or linear-elastic flange joint models is carried out to evaluate the effect of the nonlinear approach. The study demonstrates the nonlinear nature of a casing flange joint and highlights the need to include them in the analysis. The detailed modeling of the contact interaction of joints gives an insight in the nonlinear contact behavior of flanges of aircraft engine casings, and the predictive capabilities for the nonlinear analysis of gas turbine engines.

Copyright © 2012 by ASME
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Fig. 1

Scheme of the forced response analysis

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Fig. 2

Finite element sector mode (a) flange sector with detail, (b) cyclic view of sector, and (c) bolt model

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Fig. 3

Application of bolt load with joint boundary and uniform pressure distribution

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Fig. 4

Different nonlinear node locations for 46–171 elements

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Fig. 5

Nonlinear model for the sector with bolt

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Fig. 6

Different static normal stress distributions, (a) across the flange, (b) coarse mesh with joint boundary, and (c) fine mesh with joint boundary

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Fig. 7

2ND and 4ND modes for the rigidly connected sector model

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Fig. 8

Flange FRF for different excitation levels and 2 and 4 ND

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Fig. 9

Flange behavior for 4ND at 10 N excitation: (a) energy dissipation and (b) contact condition

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Fig. 10

Resonance response for different normal load distributions and at different excitation loads

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Fig. 11

Resonance response for different element numbers and nodal diameters

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Fig. 12

Resonance response for different element numbers and nodal diameters (2ND and 4ND)

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Fig. 13

Sector model with bolt; frequency response at different excitation levels

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Fig. 14

Flange behavior with bolt for 2ND at (a) 30 N and (b) 100 N excitation

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Fig. 15

Comparison between rigid, spring, nonlinear, and bolt model for 2ND at 1 N excitation




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