Stochastic Dynamic Analysis of an Offshore Wind Turbine Structure by the Path Integration Method

Energies

Haijun Wang¹  Pengwen Wang¹  Chong Lian¹  Xiaofeng Dong¹  Yue Zhao¹  Jijian Lian¹  Qi Jiang¹  Chunxi Liu¹ 

[1] State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, No. 135 Yaguan Road, Jinnan District, Tianjin 300350, China;

关键词: stochastic dynamic;    offshore wind turbine;    path integration;    FFT convolution;    probability distribution function;   

DOI  :  10.3390/en12163051

来源: DOAJ

【 摘 要 】

Stochastic dynamic analysis of an offshore wind turbine (OWT) structure plays an important role in the structural safety evaluation and reliability assessment of the structure. In this paper, the OWT structure is simplified as a linear single-degree-of-freedom (SDOF) system and the corresponding joint probability density function (PDF) of the dynamic response is calculated by the implementation of the path integration (PI) method. Filtered Gaussian white noise, which is obtained from the utilization of a second-order filter, is considered as horizontal wind excitation and used to excite the SDOF system. Thus, the SDOF model and the second-order linear filter model constitute a four-dimensional dynamic system. Further, a detailed three-dimensional finite element model is applied to obtain the natural frequency of the OWT and the efficient PI method, which is modified based on the fast Fourier transform (FFT) convolution method, is also utilized to reduce the execution time to obtain the PDF of the response. Two important parameters of wind conditions, i.e., horizontal mean wind speed and turbulence standard deviation, are investigated to highlight the influences on the PDF of the dynamic response and the reliability of the OWT.

【 授权许可】

Unknown