Damping Measurements Using Operational Data

[+] Author and Article Information
G. H. James, T. G. Carne, P. S. Veers

Experimental Structural Dynamics Testing, Sandia National Laboratories, Albuquerque, NM 87185-0557

J. Sol. Energy Eng 118(3), 190-193 (Aug 01, 1996) (4 pages) doi:10.1115/1.2870943 History: Received June 01, 1992; Revised December 01, 1993; Online February 14, 2008


We have measured modal damping using strain-gauge data from an operating wind turbine. This new technique for measuring modal damping is easier and less expensive than previously used methods. Auto-correlation and cross-correlation functions of the strain-gauge data have been shown to consist of decaying sinusoids which correspond to the modal frequencies and damping ratios of the wind turbine. We have verified the method by extracting damping values from an analytically generated data set. Actual operating response data from the DOE/Sandia 34-m Test Bed has been used to calculate modal damping ratios as a function of rotor rotation rate. This capability will allow more accurate fatigue life prediction and control.

Copyright © 1996 by The American Society of Mechanical Engineers
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