Novel tuned mass dampers installed inside tower of spar offshore floating wind turbines

• Published in: Ocean engineering Vol. 301; p. 117412
• Main Authors: Lin, Jiahuan, Wang, Yangwei, Zhang, Guanchen, Liu, Yuanchang, Zhang, Jun
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.06.2024
• Subjects: Offshore floating wind turbine; Simplified dynamic model; Stroke limitation; Tuned mass damper; Vibration suppression; Offshore floating wind turbine; Simplified dynamic model; Vibration suppression; Tuned mass damper; Stroke limitation
• ISSN: 0029-8018; 1873-5258
• DOI: 10.1016/j.oceaneng.2024.117412

Compared to fixed-bottom wind turbines, offshore floating wind turbines (OFWTs) are subject to more prominent forced vibrations that require control measures. Considering the limited space within the nacelle, this paper proposed a novel methodology for designing a tuned mass dampers (TMD) installed inside the tower. To achieve an optimal design, a 4-degree-of-freedom simplify dynamic model is established to predict the vibration characteristics of spar OFWTs quickly and accurately. A new TMD configuration installed inside the tower is proposed to reduce the effect of space limitation and to determine the stroke limitation Based on the proposed methodology, the stiffness and damping of the TMD are designed and optimized, and then the detailed structural parameters are calculated. The comparison results show that, the proposed TMD achieves a maximum peak suppression rate of 90.67% in tower top fore-aft deformation power spectral density, which is 19.92% higher than that of the TMD designed by the formula method. The proposed TMD can effectively address the problem caused by the space limitation within nacelle, and provide superior vibration suppression for spar OFWTs. •A novel tuned mass damper configuration installed inside the OFWT tower is proposed.•An accurate 4-DOF model is proposed to predict the dynamic characteristics of OFWTs.•A design methodology of tuned mass dampers is proposed for the stroke limitation.•The effects of the novel tuned mass damper is fully validated by the simulation.