Measurements are presented from a two-beam structure with several bolted interfaces in order to characterize the nonlinear damping introduced by the joints. The measurements (all at force levels below macroslip) reveal that each underlying mode of the structure is well approximated by a single degree-of-freedom (SDOF) system with a nonlinear mechanical joint. At low enough force levels, the measurements show dissipation that scales as the second power of the applied force, agreeing with theory for a linear viscously damped system. This is attributed to linear viscous behavior of the material and/or damping provided by the support structure. At larger force levels, the damping is observed to behave nonlinearly, suggesting that damping from the mechanical joints is dominant. A model is presented that captures these effects, consisting of a spring and viscous damping element in parallel with a four-parameter Iwan model. The parameters of this model are identified for each mode of the structure and comparisons suggest that the model captures the stiffness and damping accurately over a range of forcing levels.
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P.O. Box 1939,
Fond du Lac, WI 54936-1939
e-mail: brandon.deaner@mercmarine.com
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April 2015
Research-Article
Application of Viscous and Iwan Modal Damping Models to Experimental Measurements From Bolted Structures
Brandon J. Deaner,
P.O. Box 1939,
Fond du Lac, WI 54936-1939
e-mail: brandon.deaner@mercmarine.com
Brandon J. Deaner
Mercury Marine
,W6250 Pioneer Road
,P.O. Box 1939,
Fond du Lac, WI 54936-1939
e-mail: brandon.deaner@mercmarine.com
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Matthew S. Allen,
Matthew S. Allen
Associate Professor
Department of Engineering Physics,
1500 Engineering Drive,
Madison, WI 53706
e-mail: msallen@engr.wisc.edu
Department of Engineering Physics,
University of Wisconsin-Madison
,535 Engineering Research Building
,1500 Engineering Drive,
Madison, WI 53706
e-mail: msallen@engr.wisc.edu
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Daniel J. Segalman,
Daniel J. Segalman
Department of Engineering Physics,
1500 Engineering Drive,
Madison, WI 53706
e-mail: segalman@wisc.edu
University of Wisconsin-Madison
,538 Engineering Research Building
,1500 Engineering Drive,
Madison, WI 53706
e-mail: segalman@wisc.edu
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Hartono Sumali
Hartono Sumali
Science, Technology and
Engineering Integration,
Albuquerque, NM 87185
e-mail: hsumali@sandia.gov
Engineering Integration,
Sandia National Laboratories
,P.O. Box 5800
,Albuquerque, NM 87185
e-mail: hsumali@sandia.gov
Search for other works by this author on:
Brandon J. Deaner
Mercury Marine
,W6250 Pioneer Road
,P.O. Box 1939,
Fond du Lac, WI 54936-1939
e-mail: brandon.deaner@mercmarine.com
Matthew S. Allen
Associate Professor
Department of Engineering Physics,
1500 Engineering Drive,
Madison, WI 53706
e-mail: msallen@engr.wisc.edu
Department of Engineering Physics,
University of Wisconsin-Madison
,535 Engineering Research Building
,1500 Engineering Drive,
Madison, WI 53706
e-mail: msallen@engr.wisc.edu
Michael J. Starr
Daniel J. Segalman
Department of Engineering Physics,
1500 Engineering Drive,
Madison, WI 53706
e-mail: segalman@wisc.edu
University of Wisconsin-Madison
,538 Engineering Research Building
,1500 Engineering Drive,
Madison, WI 53706
e-mail: segalman@wisc.edu
Hartono Sumali
Science, Technology and
Engineering Integration,
Albuquerque, NM 87185
e-mail: hsumali@sandia.gov
Engineering Integration,
Sandia National Laboratories
,P.O. Box 5800
,Albuquerque, NM 87185
e-mail: hsumali@sandia.gov
Contributed by the Technical Committee on Vibration and Sound of ASME for publication in the JOURNAL OF VIBRATION AND ACOUSTICS. Manuscript received June 1, 2013; final manuscript received November 8, 2014; published online January 20, 2015. Assoc. Editor: Weidong Zhu.
J. Vib. Acoust. Apr 2015, 137(2): 021012 (12 pages)
Published Online: April 1, 2015
Article history
Received:
June 1, 2013
Revision Received:
November 8, 2014
Online:
January 20, 2015
Citation
Deaner, B. J., Allen, M. S., Starr, M. J., Segalman, D. J., and Sumali, H. (April 1, 2015). "Application of Viscous and Iwan Modal Damping Models to Experimental Measurements From Bolted Structures." ASME. J. Vib. Acoust. April 2015; 137(2): 021012. https://doi.org/10.1115/1.4029074
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