CNCS Center for Nonlinear and Complex Systems
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Publications [#282515] of Lawrence N. Virgin

Papers Published

  1. Nichols, JM; Nichols, CJ; Todd, MD; Seaver, M; Trickey, ST; Virgin, LN, Use of data-driven phase space models in assessing the strength of a bolted connection in a composite beam, Smart Materials and Structures, vol. 13 no. 2 (April, 2004), pp. 241-250, IOP Publishing [001], [doi]
    (last updated on 2019/09/19)

    Abstract:
    This work explores the role of empirical dynamical models in deducing the level of preload loss in a bolted connection. Specifically, we examine the functional relationship between data gleaned from locations on either side of the connection using nonlinear predictive models. This relationship, as quantified by a measure of prediction error, changes as a function of bolt loosening, thus allowing both the presence and magnitude of the axial load to be identified. The models are based on a phase space portrayal of the system dynamics and require only that the structure's response be low dimensional. The technique is demonstrated experimentally on a composite beam fastened to steel plates with four instrumented bolts. Results are compared to a similar approach using an auto-regressive (AR) modeling technique.

    Keywords:
    Composite beams and girders;Robustness (control systems);Nonlinear systems;Monitoring;Natural frequencies;Vectors;Regression analysis;X ray radiography;Mathematical models;Algorithms;