NDLI: On the Influence of Strain Gauge Instrumentation on Blade Vibrations of Integral Blisk Compressor Rotors Applying a Discrete Model

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Beirow, Bernd Ku¨hhorn, Arnold Nipkau, Jens
Copyright Year	2009
Abstract	The effect of blade frequency mistuning on the forced response of HPC-blisks is studied by means of experimental and numerical investigations applying discrete mechanical low degree of freedom models. Besides the mistuning resulting from manufacturing and inhomogeneous material also strain gauge (S/G) induced mistuning is considered. Blade by blade measurements supported by numerical calculations are used to determine mistuning distributions within an iterative approach. Due to the stiffness contribution of high temperature S/G, a significant increase of blade alone frequencies can be proved. It is shown within laser scanning measurements that this S/G induced mistuning can cause strongly localized mode shapes. Since S/G signals are used to monitor also non-instrumented blade resonances in engine-tests, it is reasonable to consider the S/G contribution within model-updates. The numerical models introduced in this paper are adjusted to experimentally determined blade alone frequency distributions. Within simulations of the forced response it is shown in principle, that the S/G-instrumentation also affects the response of non-instrumented blades which is important with regard to the S/G calibration process. Additional investigations are addressed to the consequences of small variations in measured mistuning distributions on the maximum forced response, i. e. resulting from a changing ambient temperature while measurement or a limited frequency resolution. In this context, a strong dependence on the engine order excited, the damping level and thus the flow conditions could be proved. As an example all investigations presented in this paper are carried out for two stages of a research compressor.
Sponsorship	International Gas Turbine Institute
Starting Page	245
Ending Page	253
Page Count	9
File Format	PDF
ISBN	9780791848876
DOI	10.1115/GT2009-59207
e-ISBN	9780791838495
Volume Number	Volume 6: Structures and Dynamics, Parts A and B
Conference Proceedings	ASME Turbo Expo 2009: Power for Land, Sea, and Air
Language	English
Publisher Date	2009-06-08
Publisher Place	Orlando, Florida, USA
Access Restriction	Subscribed
Subject Keyword	Damping Degrees of freedom Temperature Vibration Blades Computer simulation Rotors Instrumentation Strain gages Compressors Calibration High temperature Flow (dynamics) Engines Mode shapes Simulation Lasers Resonance Stiffness Engineering simulation Manufacturing Resolution (optics) Signals
Content Type	Text
Resource Type	Article

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