TY - GEN
T1 - Characterization of a strongly nonlinear laboratory benchmark system
AU - McFarland, D. Michael
AU - Vakakis, Alexander F
AU - Bergman, Lawrence
AU - Copeland, Timothy J.
PY - 2011/7/19
Y1 - 2011/7/19
N2 - A two-degree-of-freedom test structure originally developed to exhibit essentially nonlinear (nonlinearizable) stiffness in one of its connections has been modified to display a variable linear term in parallel with the existing nonlinear spring. This structure will be used in generating data for input to new algorithms for nonlinear system identification. In this paper, we report results from experiments in controlling the linear term introduced by applying an initial tension (preload) to the nonlinear spring, including the estimation of the parameters of a nonlinear force-displacement relation. It is shown that a sufficiently large initial tension results in predominantly linear behavior, meaning the same test setup can be used to produce dynamic behavior ranging from nearly linear to essentially nonlinear.
AB - A two-degree-of-freedom test structure originally developed to exhibit essentially nonlinear (nonlinearizable) stiffness in one of its connections has been modified to display a variable linear term in parallel with the existing nonlinear spring. This structure will be used in generating data for input to new algorithms for nonlinear system identification. In this paper, we report results from experiments in controlling the linear term introduced by applying an initial tension (preload) to the nonlinear spring, including the estimation of the parameters of a nonlinear force-displacement relation. It is shown that a sufficiently large initial tension results in predominantly linear behavior, meaning the same test setup can be used to produce dynamic behavior ranging from nearly linear to essentially nonlinear.
UR - http://www.scopus.com/inward/record.url?scp=79960289528&partnerID=8YFLogxK
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M3 - Conference contribution
AN - SCOPUS:79960289528
SN - 9781441998309
T3 - Conference Proceedings of the Society for Experimental Mechanics Series
SP - 1
EP - 6
BT - Dynamics of Civil Structures - Proceedings of the 28th IMAC, A Conference on Structural Dynamics, 2010
T2 - 28th IMAC, A Conference on Structural Dynamics, 2010
Y2 - 1 February 2010 through 4 February 2010
ER -