Posters
Come meet the poster presenters to ask them questions and discuss their work
We would like to invite you to come and see the posters at our upcoming conference. The posters will showcase a diverse range of research topics and provide an opportunity for delegates to engage with the authors and learn more about their work. Whether you are a seasoned researcher or simply curious about the latest developments in your field, we believe that the posters will offer something of interest to everyone. So please, join us at the conference and take advantage of this opportunity to learn and engage with your peers in the academic community. We look forward to seeing you there!
PO013: Rotor Imbalance using 1p / 3p frequencies
Xavier Tolron, Head of Analysis and Drone R&D, Ventus Engineering GmbH
Abstract
The wind turbines have 3 blades that have identical loads to ensure a maximal power production and to prevent damage. The symmetrical disposition of the blades, at 120° from each other, also cancel out the resultant of the lateral forces on the wind turbine. A non-symmetrical load on a blade will create vibrations and lead to fatigue. So it is critical to ensure that the blades are perfectly balanced. The Critical Components Condition Monitoring, fault detection and instant Alarm System (TripleCMAS) technology provides information based on data collected by a 3-axis accelerometer sensor located inside the tower. This accelerometer measures the acceleration of the tower on 3 axes: in the fore-aft, side-side and vertical directions. An additional 3-axis accelerometer is placed inside a blade to compute the rotational speed of the blade. It measures the edgewise, flapwise and spanwise accelerations. The acceleration data is used to monitor the tower movements and detect rotor imbalances. Several studies show that the rotor imbalance can be detected by studying the Power Spectrum of the tower acceleration. The power spectrum of the tower oscillations shows peaks corresponding to the blade rotation (1p) and its harmonics. The 3p peak, corresponding to the rotation of the 3 blades is the predominant peak when the rotor is balanced. If the peak related to the rotational speed of 1 blade (1p) is higher than the peak corresponding to the 3 blades (3p), it is a proof of an imbalance. A rotor imbalance can be detected on the power spectrum of the fore-aft oscillations, whereas a mass imbalance can be detected on the side-side oscillations.
Follow the event on: