Parameter identification of a linear substitution model for nonlinear contact and damping inside lap joints using distributed optimization: Study program “mechanical engineering”

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Abstract

The numerical simulation of flexible system dynamics considering nonlinear contact and friction forces inside joints is a very time-consuming process. In this work, a simple linear substitution model for the joint contact is proposed and the parameters are identified. Subsequently, it is numerically examined whether this model is predictive and transferable. The identified parameters are the tangential stiffness, normal stiffness, tangential damping and the contact area. All parameters are assumed to be a function of the bolt preload. The reference is a high fidelity Finite Element (FE) model of two strips of metal bolted together with three bolts. The solution of the reference model is calculated with distributed, nonlinear contact and friction forces. During the optimization, the Fourier coefficient of the first mode was fitted. To speed up the large number of time integrations a distributed optimization method is investigated. This decentralized method accelerates the optimization process almost by the factor of the used computers. The determined parameters are used in a modified setting and compared with a corresponding reference solution. The aim is to use the obtained substitute model for predictive and tendential investigations of jointed structures.

Original languageEnglish
Title of host publicationNonlinear Structures and Systems, Volume 1 - Proceedings of the 38th IMAC, A Conference and Exposition on Structural Dynamics, 2020
EditorsGaetan Kerschen, Matthew R.W. Brake, Ludovic Renson
PublisherSpringer
Pages15-29
Number of pages15
ISBN (Print)9783030476250
DOIs
Publication statusPublished - 2021
Event38th IMAC, A Conference and Exposition on Structural Dynamics, 2020 - Houston, United States
Duration: 10 Feb 202013 Feb 2020

Publication series

NameConference Proceedings of the Society for Experimental Mechanics Series
ISSN (Print)2191-5644
ISSN (Electronic)2191-5652

Conference

Conference38th IMAC, A Conference and Exposition on Structural Dynamics, 2020
CountryUnited States
CityHouston
Period10.02.202013.02.2020

Keywords

  • Distributed optimization
  • Fourier coefficient
  • Linear substitution model
  • Multibody system
  • Nonlinear joints
  • Numeric simulation
  • Parameter identification

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