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Identification of a nonlinear joint in an elastic structure using optimum equivalent linear frequency response function

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Abstract

As the main source of local nonlinearities, joints can lead to drastic changes in dynamic behavior of structures in a global scale. Finite element (FE) models often lack these nonlinearities and are incapable of representing nonlinear behavior. Therefore, the identification of nonlinear dynamic mechanical properties of the joint is necessary, in order to develop a faithful FE model of the structure. In the present work, dynamic parameters of a nonlinear joint are identified using an optimum equivalent linear frequency response function of the structure. A test rig, which includes a beam that can produce cubic stiffness spring characteristic as a nonlinear joint, is built, and nonlinear dynamic characteristics of the beam are identified. In addition to hardening behavior related to cubic stiffness, softening effects were also observed in some measured modes in which further investigation attributed that behavior to the presence of a bolt in the test rig.

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Authors and Affiliations

  1. Vibration Lab., Aerospace Department, Amirkabir University of Technology, Hafez Av., Tehran, Iran

    S. M. Sajed Sadati

  2. Aerospace Department, Centre of Excellence in Computational Aerospace Engineering, Amirkabir University of Technology, Hafez Av., Tehran, Iran

    A. S. Nobari

  3. Aerospace Department, Amirkabir University of Technology, Hafez Av., Tehran, Iran

    Tahereh Naraghi

Authors
  1. S. M. Sajed Sadati
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  2. A. S. Nobari
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  3. Tahereh Naraghi
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Correspondence to A. S. Nobari.

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Sadati, S.M.S., Nobari, A.S. & Naraghi, T. Identification of a nonlinear joint in an elastic structure using optimum equivalent linear frequency response function. Acta Mech 223, 1507–1516 (2012). https://doi.org/10.1007/s00707-012-0656-6

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  • DOI: https://doi.org/10.1007/s00707-012-0656-6

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