NDLI: Excitation of Nodal Diameter Mode-Shapes of a Stator Ring of a Turbojet Engine Using a Limited Number of Excitation Sources

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Nyssen, Florence Golinval, Jean-Claude Viguié, Régis Simon, Daniel
Copyright Year	2013
Abstract	When considering engine tests, the sensors used to monitor the rotor parts mainly consist in strain gauges whose information is very sensitive to the gauge positioning, especially in high stress gradient regions. Therefore, to reduce the risk of misinterpreting the response given by the gauges, their calibration is required. Because strain gauges are positioned so that specific modes will be monitored, their calibration must be carried out for these modes. For cyclic symmetric structures, their high spectral density imposes the use of dedicated calibration techniques. In the present paper, the concept of modal appropriation is investigated as the first step of the calibration procedure. This paper aims at presenting the development of an experimental approach enabling the isolation/appropriation of specific nodal diameter modes of a stator stage of an axial compressor using a limited number of excitation sources. A special emphasis has been brought to the minimum number and the optimized location of the excitation sources (shakers) required in laboratory conditions to appropriate specific nodal diameter modes and thereby retrieve the related modal features needed for the gauges calibration and mechanical design.
Sponsorship	International Gas Turbine Institute
File Format	PDF
ISBN	9780791855270
DOI	10.1115/GT2013-94779
Volume Number	Volume 7B: Structures and Dynamics
Conference Proceedings	ASME Turbo Expo 2013: Turbine Technical Conference and Exposition
Language	English
Publisher Date	2013-06-03
Publisher Place	San Antonio, Texas, USA
Access Restriction	Subscribed
Subject Keyword	Rotors Spectral energy distribution Strain gages Risk Compressors Calibration Gages Engines Stress Mode shapes Design engineering Turbojets Stators Excitation Sensors
Content Type	Text
Resource Type	Article

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