摘要
海上风机系统一阶横向自振频率的精确求解是风机振动分析的关键之一。基于Timoshenko梁理论,采用多段等效的方式模拟风机塔筒的连续变截面特性,并考虑土体的分层特点,建立风机系统横向振动方程,通过相邻连接段的位移、转角、弯矩和剪力之间的连续关系,推导出风机系统横向自振频率的半解析解,并与风机实测频率进行对比,验证了本方法的精确性与有效性。同时考虑风机前期设计及运营期间由于风机尺寸、土体参数可能出现的参数变化,对风机尺寸及土层要素进行了参数分析。分析表明:风机系统的横向振动频率受塔筒高度及变截面特性、土体模量、海床平面高度变化、桩径与桩长影响较大,受连接段高度的影响较小。
Accurate fundamental frequency solutions on transverse vibration analysis have the most significance for offshore wind turbines(OWTs).Taking into account the characteristic of tapered tower and layered soil,the structure was modeled as a combination of connected segments with varied cross sections.Based on Timoshenko beam theory,the transverse vibration equations were established.With the comprehensive model considering soil-structure interaction(SSI),the proposed method was then validated by the measured frequencies of four wind turbines respectively.The parametric studies show that the frequency of OWTs is sensitive to the height of tower,soil modulus,sea bed level,pile diameter as well as pile length and less sensitive to the height of transition piece.
作者
黄永健
余云燕
付艳艳
HUANG Yongjian;YU Yunyan;FU Yanyan(College of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China)
出处
《地震工程与工程振动》
CSCD
北大核心
2022年第4期210-218,共9页
Earthquake Engineering and Engineering Dynamics
基金
甘肃省科技计划项目(21YF5GA050)
甘肃省教育厅产业支撑计划项目(2021CYZC-28)
甘肃省交通运输厅科技研发项目(2021-12)
甘肃省基础研究创新群体(145RJIA332,21JR7RA347)。