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http://dx.doi.org/10.7315/CADCAM.2015.084

A Study on the Method for Dynamic Response Analysis in Frequency Domain of an Offshore Wind Turbine by Linearization of Equations of Motion for Multibody  

Ku, Namkug (Department of Naval Architecture and Ocean Engineering, Dong-eui University)
Roh, Myung-Il (Department of Naval Architecture and Ocean Engineering, and Research Institute of Marine Systems Engineering, Seoul National University)
Ha, Sol (Engineering Research Institute, Seoul National University)
Shin, Hyun-Kyoung (School of Naval Architecture and Ocean Engineering, University of Ulsan)
Publication Information
Korean Journal of Computational Design and Engineering / v.20, no.1, 2015 , pp. 84-92 More about this Journal
Abstract
In this study, we describe a method to analysis dynamic behavior of an offshore wind turbine in the frequency domain and expected effects of the method. An offshore wind turbine, which is composed of platform, tower, nacelle, hubs, and blades, can be considered as multibody systems. In general, the dynamic analysis of multibody systems are carried out in the time domain, because the equations of motion derived based on the multibody dynamics are generally nonlinear differential equations. However, analyzing the dynamic behavior in time domain takes longer than in frequency domain. In this study, therefore, we describe how to analysis the system multibody systems in the frequency domain. For the frequency domain analysis, the non-linear differential equations are linearized using total derivative and Taylor series expansions, and then the linearized equations are solved in time domain. This method was applied to analysis of double pendulum system for the verification of its effectiveness, and the equations of motion for the offshore wind turbine was derived with assuming that the wind turbine is rigid multibody systems. Using this method, the dynamic behavior analysis of the offshore wind turbine can be expected to take less time.
Keywords
Dynamic response analysis; Linearization; Multibody systems; Offshore wind turbine;
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