Application of Converted Displacement for Modal Parameter Identification of Offshore Wind Turbines with High-Pile Foundation

作     者：LI Ying WANG Bin LIU Qiang GAO Shan LU Sujie LI Ying;WANG Bin;LIU Qiang;GAO Shan;LU Sujie

作者机构：Chinese-German Institute of EngineeringZhejiang University of Science and TechnologyHangzhou 310023China Key Laboratory of Far-Shore Wind Power Technology of Zhejiang ProvinceHangzhou 311122China PowerChina Huadong Engineering Corporation LimitedHangzhou 311122China Zhejiang Huadong Mapping and Engineering Safety Technology Co.Ltd.Hangzhou 310014China 

出 版 物：《Journal of Ocean University of China》 (中国海洋大学学报（英文版）)

年 卷 期：2022年第21卷第6期

页      面：1467-1478页

核心收录：

学科分类：08[工学] 081401[工学-岩土工程] 0707[理学-海洋科学] 0807[工学-动力工程及工程热物理] 0814[工学-土木工程] 

基　　金：financial support of the National Natural Science Foundation of China(Nos.52071301,51909238 and 52101333) the Zhejiang Provincial Natural Science Foundation of China(No.LHY21E090001) the Zhejiang Provincial Natural Science Foundation of China(No.LQ21E090009)。 

主　　题：offshore wind turbine high-pile foundation modal parameter identification baseline drift low-frequency noise 

摘      要：In the actual measurement of offshore wind turbines(OWTs),the measured accelerations usually contain a large amount of noise due to the complex and harsh marine environment,which is not conducive to the identification of structural modal parameters.For OWTs with remarkably low structural modal frequencies,displacements can effectively suppress the high-frequency vibration noise and amplify the low-frequency vibration of the structure.However,finding a reference point to measure structural displacements at sea is difficult.Therefore,only a few studies on the use of dynamic displacements to identify the modal parameters of OWTs with high-pile foundations are available.Hence,this paper develops a displacement conversion strategy to study the modal parameter identification of OWTs with high-pile foundations.The developed strategy can be divided into the following three parts:zero-order correction of measured acceleration,high-pass filtering by the Butterworth polynomial,and modal parameter identification using the calculated displacement.The superiority of the proposed strategy is verified by analyzing a numerical OWT with a high-pile foundation and the measured accelerations from an OWT with a high-pile foundation.The results show that for OWTs with high-pile foundations dominated by low frequencies,the developed strategy of converting accelerations into displacements and then performing modal parameter identification is advantageous to the identification of modal parameters,and the results have high accuracy.