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Extracting Damping Ratio from Dynamic Data and Numerical SolutionsThere are many ways to extract damping parameters from data or models. This Technical Memorandum provides a quick reference for some of the more common approaches used in dynamics analysis. Described are six methods of extracting damping from data: the half-power method, logarithmic decrement (decay rate) method, an autocorrelation/power spectral density fitting method, a frequency response fitting method, a random decrement fitting method, and a newly developed half-quadratic gain method. Additionally, state-space models and finite element method modeling tools, such as COMSOL Multiphysics (COMSOL), provide a theoretical damping via complex frequency. Each method has its advantages which are briefly noted. There are also likely many other advanced techniques in extracting damping within the operational modal analysis discipline, where an input excitation is unknown; however, these approaches discussed here are objective, direct, and can be implemented in a consistent manner.
Document ID
20170005173
Acquisition Source
Marshall Space Flight Center
Document Type
Technical Memorandum (TM)
Authors
Casiano, M. J. (NASA Marshall Space Flight Center Huntsville, AL, United States)
Date Acquired
June 5, 2017
Publication Date
September 1, 2016
Subject Category
Computer Programming And Software
Report/Patent Number
M-1418
NASA/TM-2016-218227
M16-5584
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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