Berlin 2012 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 13: Nonlinear Stochastic Processes

DY 13.3: Vortrag

Dienstag, 27. März 2012, 14:45–15:00, MA 004

Stochastic data analysis for in-situ damage analysis — •Philip Rinn, Joachim Peinke, Hendrik Heißelmann, and Matthias Wächter — ForWind -- Center for Wind Energy Research, Institute of Physics, University of Oldenburg

A new method how to analyze the elastic features of a mechanical structure under turbulent excitation is presented. One limitation of common approaches is that noisy excitation of the structure makes it harder to detect changes reliably, because peaks in the frequency spectrum are broadened due to the noise and changes can not be detected precisely. We use an in-situ approach to look at the dynamical behavior of the system and to analyze damages due to its changing of the systems dynamics. With methods from stochastic data analysis we separate the stochastic part from the deterministic part of the system. In particular the Langevin equation from undamaged and damaged beam structures in turbulent air inflow is reconstructed. We show that the slope of the drift, that is the determinism of the system, changes with increasing damage and compare the results with changes in eigenfrequencies.