A study of nonlinear vibrations in a frictionally-damped turbine bladed disc with comprehensive modelling of aerodynamic effects

Petrov, E P, Zachariadis, Z- I, Beretta, A and Elliot, R (2012) A study of nonlinear vibrations in a frictionally-damped turbine bladed disc with comprehensive modelling of aerodynamic effects. In: ASME Turbo Expo 2012: Turbine Technical Conference and Exposition, Volume 7: Structures and Dynamics, Parts A and B, Copenhagen, Denmark, June 11–15, 2012. Proceedings of the ASME Turbo Expo . American Society of Mechanical Engineers (ASME), pp. 1239-1251.

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Abstract

A new effective method for comprehensive modelling of gas flow effects on vibration of nonlinear vibration of bladed discs has been developed for a case when effect of the gas flow on the mode shapes is significant. The method separates completely the structural dynamics calculations from the significantly more computationally expensive computational fluid dynamics (CFD) calculations while provides the high accuracy of modelling for aerodynamic effects. A comprehensive analysis of the forced response using the new method has been performed for a realistic turbine bladed disc with root-disc joints, tip and underplatform dampers. The full chain of aerodynamic and structural calculations are performed: (i) determination of boundary conditions for CFD; (ii) CFD analysis; (iii) calculation of the aerodynamic characteristics required by the new method; (iv) nonlinear forced response analysis using the MAIM. The efficiency of the friction damping devices has been studied and compared for several resonance frequencies and engine orders. Advantages of the method for aerodynamic effect modelling have been demonstrated. Copyright 2012 by ASME.

Item Type: Book Section
Additional Information: Paper No. GT2012-69052
Keywords: Aerodynamics Computational fluid dynamics Exhibitions Flow of gases Gas turbines Structural dynamics Turbine components
Schools and Departments: School of Engineering and Informatics > Engineering and Design
Subjects: T Technology > TJ Mechanical engineering and machinery > TJ0170 Mechanics applied to machinery. Dynamics
T Technology > TL Motor vehicles. Aeronautics. Astronautics > TL0500 Aeronautics. Aeronautical engineering
Depositing User: Yevgen Petrov
Date Deposited: 04 May 2015 07:33
Last Modified: 05 May 2015 07:27
URI: http://sro.sussex.ac.uk/id/eprint/53863
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