NDLI: Experimental Methodology for Determining Turbomachinery Blade Damping Using Magnetic Bearing Excitation and Non-Contacting Optical Measurements

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Andrew, J. Provenza Kirsten, P. Duffy
Copyright Year	2010
Abstract	Experiments to determine the effects of turbomachinery fan blade damping concepts such as passively shunted piezoelectric materials on blade response are ongoing at the NASA Glenn Research Center. A vertical rotor is suspended and excited with active magnetic bearings (AMBs) usually in a vacuum chamber to eliminate aerodynamic forces. Electromagnetic rotor excitation is superimposed onto rotor PD-controlled support and can be fixed to either a stationary or rotating frame of reference. The rotor speed is controlled with an air turbine system. Blade vibrations are measured using optical probes as part of a Non-Contacting Stress Measurement System (NSMS). Damping is calculated from these measurements. It can be difficult to get accurate damping measurements using this experimental setup and some of the details of how to obtain quality results are seemingly nontrivial. The intent of this paper is to present those details.
Sponsorship	International Gas Turbine Institute
Starting Page	739
Ending Page	747
Page Count	9
File Format	PDF
ISBN	9780791844014
DOI	10.1115/GT2010-22093
e-ISBN	9780791838723
Volume Number	Volume 6: Structures and Dynamics, Parts A and B
Conference Proceedings	ASME Turbo Expo 2010: Power for Land, Sea, and Air
Language	English
Publisher Date	2010-06-14
Publisher Place	Glasgow, UK
Access Restriction	Subscribed
Subject Keyword	Damping Vibration Blades Nasa Rotors Turbomachinery Aerodynamics Fluid-dynamic forces Magnetic bearings Stress Optical measurement Vacuum Measurement systems Piezoelectric materials Excitation Probes Turbines
Content Type	Text
Resource Type	Article

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