Gravity Effect on the First Natural Frequency of Offshore Wind Turbine Structures

作     者：Ma Hongwang Chen Longzhu 

作者机构：Department of Civil EngineeringShanghai Jiao Tong University 

出 版 物：《Transactions of Nanjing University of Aeronautics and Astronautics》 (南京航空航天大学学报（英文版）)

年 卷 期：2016年第33卷第1期

页      面：95-101页

核心收录：

学科分类：08[工学] 0807[工学-动力工程及工程热物理] 

基　　金：supported by the National Basic Research Program of China(″973″Program)(No.2014CB046200) 

主　　题：offshore wind turbine the first natural frequency gravity Euler-Bernoulli beam 

摘      要：The fatigue limit state is critical for most offshore wind *** minimize the development of fatigue damage,dynamic amplification of the response must be ***,it is important to ensure that the first natural frequency of the offshore wind turbine does not coincide with the excitation frequencies related to wind turbine and wave *** evaluating the self-gravity influence on the first natural frequency of wind turbine support structures,the offshore wind turbine system vibration is modeled using an Euler-Bernoulli beam with axial force and horizontal *** data from five wind turbines available in the market are *** sizes of wind turbines vary from 2.3MW to 6MW,and subsequently,the heights of tubular steel towers vary from 83 mto *** indicate that the average influence of gravity on the first natural frequency is nearly 1.8%.The first natural frequency is considered ranging from 1P(rototor frequency)to 3P(blade passing frequency).The design procedure requires an accurate evaluation of the first natural *** this perspective,the first natural frequency is reduced since gravity needs to be considered for the design of offshore wind turbine support structures,especially when the first natural frequency of the offshore wind turbine is close to the lower limit,rotor frequency1 P.