Shaker-structure interaction modeling and analysis for nonlinear force appropriation testing

Pacini, Benjamin R.; Kuether, Robert J.; Roettgen, Daniel R.

doi:10.1016/j.ymssp.2021.108000

Shaker-structure interaction modeling and analysis for nonlinear force appropriation testing

Journal Article · Sat May 15 00:00:00 EDT 2021 · Mechanical Systems and Signal Processing

DOI:https://doi.org/10.1016/j.ymssp.2021.108000· OSTI ID:1783767

Pacini, Benjamin R. ^[1]; Kuether, Robert J. ^[1]; Roettgen, Daniel R. ^[1]

Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

Nonlinear force appropriation is an extension of its linear counterpart where sinusoidal excitation is applied to a structure with a modal shaker and phase quadrature is achieved between the excitation and response. While a standard practice in modal testing, modal shaker excitation has the potential to alter the dynamics of the structure under test. Previous studies have been conducted to address several concerns, but this work specifically focuses on a shaker-structure interaction phenomenon which arises during the force appropriation testing of a nonlinear structure. Under pure-tone sinusoidal forcing, a nonlinear structure may respond not only at the fundamental harmonic but also potentially at sub- or superharmonics, or it can even produce aperiodic and chaotic motion in certain cases. Shaker-structure interaction occurs when the response physically pushes back against the shaker attachment, producing non-fundamental harmonic content in the force measured by the load cell, even for pure tone voltage input to the shaker. This work develops a model to replicate these physics and investigates their influence on the response of a nonlinear normal mode of the structure. Experimental evidence is first provided that demonstrates the generation of harmonic content in the measured load cell force during a force appropriation test. This interaction is replicated by developing an electromechanical model of a modal shaker attached to a nonlinear, three-mass dynamical system. Several simulated experiments are conducted both with and without the shaker model in order to identify which effects are specifically due to the presence of the shaker. Finally, the results of these simulations are then compared to the undamped nonlinear normal modes of the structure under test to evaluate the influence of shaker-structure interaction on the identified system’s dynamics.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC04-94AL85000; NA0003525

OSTI ID:: 1783767

Alternate ID(s):: OSTI ID: 1815326

Report Number(s):: SAND--2021-5781J; 696159

Journal Information:: Mechanical Systems and Signal Processing, Journal Name: Mechanical Systems and Signal Processing Vol. 162; ISSN 0888-3270

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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42 ENGINEERING
nonlinear force appropriation
nonlinear normal modes
phase control
phase quadrature
shaker structure interaction
structural dynamics

Shaker-structure interaction modeling and analysis for nonlinear force appropriation testing

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References (15)

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