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Simulated Gas Turbine Casing Response to Rotor Blade Pressure Excitation

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Authors
Forbes, Gareth
Randall, R.
Date
2007
Type
Conference Paper

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Citation
Forbes, G. and Randall, R. 2007. Simulated Gas Turbine Casing Response to Rotor Blade Pressure Excitation, in Martin Veidt (ed), 5th Australasian Congress on Applied Mechanics (ACAM 2007), Dec 10 2007. Brisbane, Australia: Engineers Australia.
Source Title
Proceedings of the 5th Australasian Congress on Applied Mechanics (ACAM 2007)
Source Conference
5th Australasian Congress on Applied Mechanics (ACAM 2007)
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Abstract

Non-intrusive measurement of blade condition within gas turbines is of major interest within all areas of their use. It is proposed that the measurement of the casing vibration, due to the aerodynamic-structural interaction within the turbine, could provide a means of blade condition monitoring and modal parameter estimation. In order to understand the complex relationship between blade vibrations and casing response, an analytical model of the casing and simulated pressure signal associated with the rotor blades is presented. A mathematical formulation is undertaken of the internal pressure signal due to both the rotating bladed disk as well as individual blade vibrations and the solution of the casing response is formulated. Excitation by the stator blades and their contribution to the casing response is also investigated. Some verification of the presented analytical model is provided by comparison with Finite Element Analysis results for various rotor rotational speeds.