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 parame-ters. 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 iden-tification of OWTs with high-pile foundations. The developed strategy can be divided into the following three parts: zero-order correc-tion of measured acceleration, high-pass filtering by the Butterworth polynomial, and modal parameter identification using the calcu-lated 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 pa-rameter identification is advantageous to the identification of modal parameters, and the results have high accuracy.

LI Ying;WANG Bin;LIU Qiang;GAO Shan;LU Sujie

Chinese-German Institute of Engineering,Zhejiang University of Science and Technology,Hangzhou 310023,China;Key Laboratory of Far-Shore Wind Power Technology of Zhejiang Province,Hangzhou 311122,China;PowerChina Huadong Engineering Corporation Limited,Hangzhou 311122,China;Zhejiang Huadong Mapping and Engineering Safety Technology Co.,Ltd.,Hangzhou 310014,China

中国海洋大学学报（自然科学英文版）

[1]LI Ying;WANG Bin;LIU Qiang;GAO Shan;LU Sujie-.Application of Converted Displacement for Modal Parameter Identification of Offshore Wind Turbines with High-Pile Foundation)[J].中国海洋大学学报（自然科学英文版）,2022(06):1467-1478

Converted,OWTs

Application,Displacement,Modal,Parameter,Identification,Offshore,Wind,Turbines,High,Pile,Foundation,In,actual,measurement,offshore,wind,turbines,measured,accelerations,usually,contain,large,amount,noise,due,complex,harsh,marine,environment,which,not,conducive,identification,structural,modal,For,remarkably,frequencies,displacements,can,effectively,suppress,high,frequency,vibration,amplify,structure,However,finding,reference,point,sea,difficult,Therefore,only,few,studies,use,dynamic,identify,parameters,pile,foundations,are,available,Hence,this,paper,develops,conversion,strategy,study,developed,be,divided,into,following,three,parts,zero,order,correc,pass,filtering,by,Butterworth,polynomial,using,calcu,lated,superiority,proposed,verified,analyzing,numerical,from,results,show,that,dominated,converting,then,performing,advantageous,have,accuracy

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