Posters

Abstract

The experimental investigations have demonstrated the usefulness of the particle damping technique. It has been found that all concepts developed to reduce the vibration amplitude of wind turbine stators are very efficient. The damping plate concept has shown that the location of the damping plate on the stator plays a crucial role in vibration attenuation. The investigation also shows that a vibration attenuation of up to 12 dB can be achieved by mounting a multi-unit damping plate on the outer wall of the stator ring. However, the additional mass and complex manufacturing and production process can be a drawback for this concept. Therefore, to tackle this concern, the existing cavity concept has been developed. This approach can reduce the vibration amplitude of the wind turbine stator test specimen up to 18 dB with a minimal increase in the additional mass. The material investigation has shown that materials, like rubber granulate, are efficient to reduce the low-frequency vibration amplitude. All concepts and design variables proposed in this contribution for wind turbine stator are combined and have been tested at a real-scale wind turbine stator, which shows a promising outcome. Moreover, all strategies developed for wind turbine blades can reduce the vibration amplitude significantly. However, the additional mass, tedious manufacturing, and production process can be drawbacks to this approach. The second approach is capable of reducing the vibration amplitude up to 22 dB. Nevertheless, modification of the original sandwich core can also modify the stiffness and vibration behavior of the primary structure as well as can weaken the laminates and cause durability issues. Hence, to resolve this issue a third strategy has been suggested, which shows similar vibration attenuation as the second approach with a marginal increase in additional mass. Therefore, this strategy has been successfully tested on real-scaled wind turbine blades.