Open AccessExperimental Analysis of a Scaled-Down Vestas Four-Rotor Wind Turbine
Author(s) -
Oliver Tierdad Filsoof,
Anders Yde,
Peter Bøttcher,
Xuping Zhang
Publication year - 2020
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1618/3/032005
Subject(s) - impulse (physics) , turbine , rotor (electric) , vibration , mechanism (biology) , froude number , control theory (sociology) , acoustics , physics , mechanics , computer science , mechanical engineering , engineering , classical mechanics , breakup , control (management) , quantum mechanics , artificial intelligence
In this work, a 1/30 scaled-down Vestas four-rotor demonstrator wind turbine is established as an experimental setup. The experimental setup is used to analyze how the structural natural frequencies are affected by the rotor speed for a multi-rotor wind turbine. To have comparable dynamic behavior between the Vestas turbine and the experimental setup, Froude scaling is used. For standstill tests, a metal brushing technique is employed to excite the setup, and when rotating an automated impulse mechanism provide impulses to the rotor blades. Modal testing experiments are conducted, and testing results show that standstill frequencies between the Vestas turbine and experimental setup coincided. The experiment demonstrates that by using the automated impulse mechanism from 40 rpm to 110 rpm, edgewise whirling modes are excited and proportional to the rotor speed. The setup experiences large vibrations if the rotor speed continues increasing beyond 110 rpm using the impulse mechanism. Switching to the metal brushing technique achieves better results, and makes it possible to see that both the flapwise and edgewise whirling modes are proportional to the rotor speed.