Dynamic Analysis of Wind Turbine Tower-Foundation with Stiffeners

Abstract:

In the light of the geometric characteristics of wind turbine and the distribution of stiffeners, the finite element models for the megawatt horizontal axis wind turbine are established by ANSYS. A model analysis is made of the effect of the foundation stiffness, longitudinal stiffeners, ring stiffeners and orthogonal stiffeners on natural frequency and vibration mode of the tower. The results show that the foundation stiffness and stiffeners all have a certain influence on the natural frequency of the tower. There is a 7% difference in the first-order natural frequency between the models of the tower with and without foundation stiffness; there is an increase in natural frequency of the tower when longitudinal stiffeners or orthogonal stiffeners are considered, while natural frequency of the tower experiences an erratic change with the increase of ring stiffeners. The present study will provide some theoretical basis for the optimization design of wind turbines.

• Periodical: Applied Mechanics and Materials (Volume 431)
• Pages: 126-131
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.431.126
• Online since: October 2013
• Authors: Xi Song*, Jie Yu Li, Bo Wang
• Keywords: Finite Element Analysis (FEA), Foundation Stiffness, Natural Frequency, Stiffener, Wind Turbine Tower

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