Dynamic analysis and optimization of a wind turbine tower subject to wind and earthquake loads

• Published in: The structural design of tall and special buildings Vol. 31; no. 15
• Main Authors: Zhu, Hao, Li, Deyu, Xu, Jun
• Format: Journal Article
• Language: English
• Published: Oxford Wiley Subscription Services, Inc 25.10.2022
• Subjects: Algorithms; Body weight; Constraints; Design optimization; dynamic model; Dynamic models; dynamic response; earthquake; Earthquake loads; Earthquakes; Ground motion; Modal analysis; Mutation; Particle swarm optimization; Penalty function; Seismic activity; Shear stress; stochastic wind loads; Turbines; Vibration; Vibration control; Wind effects; Wind loads; Wind power; Wind stress; wind turbine tower; Wind turbines
• ISSN: 1541-7794; 1541-7808
• DOI: 10.1002/tal.1971

Summary A dynamic model of a wind turbine tower is established to investigate its dynamic responses under wind and earthquake loads. Then a generalized global spatial discretization method is used to solve the problem. Modal analysis of the wind turbine tower is conducted using the dynamic model and the results are verified by shell models and beam models established in the commercial FE software ANSYS and LS‐DYNA. Transient vibration displacements, as well as normal and shear stress distributions of the wind turbine tower subject to different levels of pulsing wind loads, are calculated based on the dynamic model. Quasi‐static motion and transient motion assumptions are applied to evaluate the strengths of the tower, respectively. Influences of different earthquake ground motions on vibration amplitudes of the tower top are examined. Then, a hybrid mutation particle swarm optimization algorithm is used to perform design optimization on the tower body thickness for vibration reduction with its weights and strength being constrained. The penalty function strategy is used to deal with the constraints on body weight and stress level. Results demonstrate that the comprehensive performances of the wind turbine tower especially the tower top vibration have been greatly reduced after optimization.