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Research Papers: Gas Turbines: Structures and Dynamics

Method for Sensitivity Analysis of Resonance Forced Response of Bladed Disks With Nonlinear Contact Interfaces

[+] Author and Article Information
E. P. Petrov

Mechanical Engineering Department, Centre of Vibration Engineering, Imperial College London, South Kensington Campus, London SW7 2AZ, UKy.petrov@imperial.ac.uk

J. Eng. Gas Turbines Power 131(2), 022510 (Dec 30, 2008) (9 pages) doi:10.1115/1.2969094 History: Received April 10, 2008; Revised April 14, 2008; Published December 30, 2008

An effective method has been developed to calculate the sensitivity of the resonance peak frequency and forced response level to variation of parameters of nonlinear friction contact interfaces and excitation. The method allows determination of the sensitivity characteristics simultaneously with the resonance peak frequency and response level calculated as a function of any parameter of interest and without significant computational expense. Capabilities of the method are demonstrated on examples of analysis of large-scale finite element models of realistic bladed disks with major types of the nonlinear contact interfaces: (i) a blisk with underplatform dampers, (ii) a bladed disk with friction damping at blade fir-tree roots, and (iii) a high-pressure bladed disk with shroud contacts. The numerical investigations show high efficiency of the method proposed.

Copyright © 2009 by American Society of Mechanical Engineers
Topics: Resonance , Friction , Disks
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References

Figures

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Figure 1

A FE model of the test-rig blisk with underplatform dampers: (a) the whole blisk; (b) a sector FE model

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Figure 2

Forced response calculated for different normal load values and results of the direct parametric analysis

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Figure 3

Dependencies of the resonance frequency and response level on the normal load calculated

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Figure 4

Sensitivities of the resonance frequency: (a) for lower values of the normal load; (b) for higher values of the normal load

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Figure 5

Sensitivities of the resonance peak response level: (a) for lower values of the normal load; (b) for higher values of the normal load

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Figure 6

A model of the bladed turbine disk with friction interfaces at blade-disk root joints: (a) a sector bladed disk FE model; (b) area friction contact elements applied contact interfaces

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Figure 7

Forced response calculated for different gap values and results of the direct parametric analysis

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Figure 8

Dependencies of the resonance frequency and response level on the normal load calculated

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Figure 9

Sensitivities of the resonance frequency to blade root joint parameters

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Figure 10

Sensitivities of the resonance peak response level to blade root joint parameters

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Figure 11

A model of the high-pressure turbine disk with friction contacts of shroud: (a) a sector FE model; (b) the bladed disk shrouds; (c) friction contact element distributed over the contact interface

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Figure 12

Forced response calculated for different interference values and results of the direct parametric analysis

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Figure 13

Dependencies of the resonance frequency and response level on the normal load: a case of interferences

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Figure 14

Sensitivities of the resonance frequency to shroud friction contact parameters: a case of interferences

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Figure 15

Sensitivities of the resonance peak response level to shroud friction contact parameters: a case of interferences

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Figure 16

Forced response calculated for different clearance values and results of the direct parametric analysis

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Figure 17

Dependencies of the resonance frequency and response level on the normal load: a case of clearances

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Figure 18

Sensitivities of the resonance frequency to shroud friction contact parameters: a case of clearances

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Figure 19

Sensitivities of the resonance peak response level to shroud friction contact parameters: a case of clearances

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