Application of viscous and Iwan modal damping models to experimental measurements from bolted structures

Deaner, Brandon J.; Allen, Matthew S.; Starr, Michael James; Segalman, Daniel J.; Sumali, Hartono

doi:10.1115/1.4029074

Application of viscous and Iwan modal damping models to experimental measurements from bolted structures

Journal Article · Mon Jan 19 23:00:00 EST 2015 · Journal of Vibration, Acoustics, Stress, and Reliability in Design

DOI:https://doi.org/10.1115/1.4029074· OSTI ID:1235315

Deaner, Brandon J. ^[1]; Allen, Matthew S. ^[2]; Starr, Michael James ^[3]; Segalman, Daniel J. ^[2]; Sumali, Hartono ^[3]

Mercury Marine, Fond du Lac, WI (United States)
Univ. of Wisconsin-Madison, Madison, WI (United States)
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

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. As a result, 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.

Research Organization:: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA), Office of Defense Science (NA-113)

Grant/Contract Number:: AC04-94AL85000

OSTI ID:: 1235315

Report Number(s):: SAND--2015-2643J; 581981

Journal Information:: Journal of Vibration, Acoustics, Stress, and Reliability in Design, Journal Name: Journal of Vibration, Acoustics, Stress, and Reliability in Design Journal Issue: 2 Vol. 137; ISSN 0739-3717

Country of Publication:: United States

Language:: English

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Cited By (5)

A Reduced Iwan Model that Includes Pinning for Bolted Joint Mechanics Brake, M. R. W. Dynamics of Coupled Structures, Volume 4 https://doi.org/10.1007/978-3-319-29763-7_22	book	May 2016
Substructuring of a Nonlinear Beam Using a Modal Iwan Framework, Part I: Nonlinear Modal Model Identification Roettgen, Daniel; Allen, Matthew S.; Kammer, Daniel Dynamics of Coupled Structures, Volume 4 https://doi.org/10.1007/978-3-319-54930-9_15	book	April 2017
A reduced Iwan model that includes pinning for bolted joint mechanics Brake, M. R. W. Nonlinear Dynamics, Vol. 87, Issue 2 https://doi.org/10.1007/s11071-016-3117-2	journal	October 2016
Frictional Damping of Flutter: Microslip Versus Macroslip Hudson, Robert; Sinha, Alok Journal of Vibration and Acoustics, Vol. 138, Issue 6 https://doi.org/10.1115/1.4034078	journal	August 2016
Frictional Damping of Flutter: Microslip Versus Macroslip Hudson, Robert B.; Sinha, Alok ASME 2016 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference, Volume 8: 28th Conference on Mechanical Vibration and Noise https://doi.org/10.1115/detc2016-60423	conference	December 2016

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