Modal Analysis of Three Rotating Blades of Large Wind Turbine

Abstract

Based on the Multi-body dynamics, the dynamics equation of the flexible blade in wind turbine is established by discretizing the rotating blade using finite element method. The simulation analysis of the single blade and the vibration modes of a 5MW wind turbine rotor are carried out by MATLAB. The first six natural frequencies and modes of the single blade and the rotor are figured out, and whose results are analyzed. The simulation results indicates that the coupling effect of the rotor can lead to dynamic stiffening. In comparison to the results in FAST, these simulation results show an outstanding agreement with the results calculated by FAST and hence approve the simulation method is valid and meanwhile give reference for large wind turbine design and running.

Fundamental natural frequencies investigation for a typical 5-MW wind turbine blade

“…The fundamental natural frequencies for a 5-MW wind turbine blade were extracted and the results compared by a numerical solver FAST showing good agreement. 2 A novel computational tool was developed for the aeroelastic analysis of a National Renewable Energy Laboratory (NREL) 5-MW wind turbine blades with an alternative blade configurations to mitigate vibration and improve fatigue performance. 3 The influence of vibrations on the aerodynamic loading on the blade of a 5-MW wind turbine was investigated using the blade element-momentum and the Beddoes-Leishman (B-L) dynamic stall model.…”