Nonlinear model parameter identification for ice-induced vibrations

Nonlinear model parameter identification for ice-induced vibrations

Dostal, Leo (Hamburg University of Technology)
Lourens, E. (TU Delft Offshore Engineering)
Metrikine, A. (TU Delft Offshore Engineering; TU Delft Applied Mechanics)

2017

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.

ice-induced vibrations
Parameter identification
Unscented Kalman Filter

http://resolver.tudelft.nl/uuid:f624da14-504f-4153-a6d1-913dc40a41a7

https://doi.org/10.1016/j.proeng.2017.09.100

1877-7058

Procedia Engineering, 199, 583-588

10th international conference on recent advances in structural dynamics, 2010-07-12 → 2010-07-14, Faculty of Civil and Industrial Engineering of Sapienza University of Rome, Roma, Italy

Institutional Repository

journal article

© 2017 Leo Dostal, E. Lourens, A. Metrikine