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 will give delegates an opportunity 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!
PO280: Absolute analysis of the Rear Frame of 2.0 MW Wind Turbines: Dynamic and Fatigue analysis of the component
Adrián López, Lead Life Extension Engineer, Nabla Wind Hub
Abstract
The rear frame of 2.0 MW wind turbines primarily serves to support various turbine components, including the electrical generator and transformer. However, this component was originally designed with static failure criteria and lacked a dynamic analysis. The rear frame is subjected to time-varying loads due to both the translations and rotations experienced by the nacelle during operation and potential eccentricities that may exist in the manufacturing and assembly of the electrical generator. As a result, in certain locations, the rear frame has exhibited cracks of considerable length and propagation speed in the welds that hold the structure together, representing a risk to the wind turbine integrity before the end of its operational life. This project involves a comprehensive structural analysis of the rear frame of 2.0 MW wind turbines. The analysis begins with a modal analysis to examine the component modes and natural frequencies. Subsequently, a frequency analysis of the excitation sources is conducted, determining the principal harmonics of the load signals. Furthermore, a frequency response analysis of the rear frame is performed to assess whether the primary harmonics induce resonance in the component. Real stresses in the component are then calculated, considering the dynamic phenomena that the component experiences. Following this, an extreme load analysis and fatigue analysis of the welds are conducted to estimate the component's expected lifespan in the desired location. Fatigue analysis is divided into basic fatigue analysis, based on von Mises stress, and advanced fatigue analysis based on critical plane methods. Finally, proposed reinforcements are suggested to address the issue of cracks in the component. This study provides a comprehensive understanding of the dynamic response of the rear frame, offering alternatives for its improved design and enhancing efficiency in renewable energy generation.
