TY - GEN
T1 - Parameter identification of a linear substitution model for nonlinear contact and damping inside lap joints using distributed optimization
T2 - 38th IMAC, A Conference and Exposition on Structural Dynamics, 2020
AU - Pöchacker, Stefan
AU - Lauß, Thomas
AU - Pichler, Florian
AU - Oberpeilsteiner, Stefan
AU - Witteveen, Wolfgang
N1 - Publisher Copyright:
© The Society for Experimental Mechanics, Inc 2021.
Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
Funding Information:
This research is part of the project Distributed Modelling and Simulation, DisMoSim, which is financed by the Forschungs und Förderungs Gesellschaft, FFG
Publisher Copyright:
© The Society for Experimental Mechanics, Inc 2021.
PY - 2021
Y1 - 2021
N2 - 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.
AB - 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.
KW - Distributed optimization
KW - Fourier coefficient
KW - Linear substitution model
KW - Multibody system
KW - Nonlinear joints
KW - Numeric simulation
KW - Parameter identification
UR - http://www.scopus.com/inward/record.url?scp=85091585845&partnerID=8YFLogxK
U2 - 10.1007/978-3-030-47626-7_3
DO - 10.1007/978-3-030-47626-7_3
M3 - Conference contribution
AN - SCOPUS:85091585845
SN - 9783030476250
T3 - Conference Proceedings of the Society for Experimental Mechanics Series
SP - 15
EP - 29
BT - Nonlinear Structures and Systems, Volume 1 - Proceedings of the 38th IMAC, A Conference and Exposition on Structural Dynamics, 2020
A2 - Kerschen, Gaetan
A2 - Brake, Matthew R.W.
A2 - Renson, Ludovic
PB - Springer
Y2 - 10 February 2020 through 13 February 2020
ER -