Nonlinear model parameter identification for ice-induced vibrations

Journal Article (2017)
Author(s)

Leo Dostal (Hamburg University of Technology)

Eliz-Mari Lourens (TU Delft - Offshore Engineering)

Andrei Metrikin (TU Delft - Offshore Engineering, TU Delft - Applied Mechanics)

Research Group
Offshore Engineering
Copyright
© 2017 Leo Dostal, E. Lourens, A. Metrikine
DOI related publication
https://doi.org/10.1016/j.proeng.2017.09.100
More Info
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Publication Year
2017
Language
English
Copyright
© 2017 Leo Dostal, E. Lourens, A. Metrikine
Research Group
Offshore Engineering
Volume number
199
Pages (from-to)
583-588
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Abstract

The problem of level ice interacting with compliant structures is addressed, where the ice loads can depend on the dynamical behavior of the structures. We are interested in a special type of ice-induced vibration, known as frequency lock-in, and characterized by having the dominant frequency of the ice forces near a natural frequency of the structure. It is shown that accurate estimates of the model parameters for the well-known Määttänen's model for ice-induced vibrations can be obtained from measurements of the structural vibrations and the ice velocity. Määttänen's model uses a state-dependent piecewise nonlinear function for the ice crushing strength, which leads to nonlinear negative damping in the equations of motion of the considered structure. The identification is achieved by means of an Unscented Kalman Filter using simulated noisy measurements of the structural behavior.