摘要
针对钢悬链式立管的特点,采用了简化后的振动模型,在ANSYS的CAE模块中根据悬链线方程建立了立管的有限元模型,并对立管进行了模态分析。通过对前若干阶模态进行后处理,得到包括归一化振型、斜率以及曲率的模态输入文件,将此模态文件输入SHEAR7中,进行涡激振动分析,计算出立管年疲劳损伤率。计算结果表明:立管的疲劳损伤沿着立管轴线方向呈振荡性质,且最大疲劳损伤出现在边界区域,随着水流速度的增大,立管的疲劳损伤的峰值呈上升趋势。
To analyze the yearly fatigue damage rate,a simplified vibration model was adopted taking into account the characteristics of steel catenary riser.A FE-model was established in CAE module of ANSYS software on the basis of the catenary equation,and modal analysis was performed,the modal inputs regarding normalized mode shapes,slopes and curvatures obtained by post-processing.Vortex induced vibration analysis was carried out to calculate the yearly fatigue damage rate of the riser by entering the processed modal inputs into SHEAR7 software.The results show that the fatigue damage of the riser oscillates in the axes direction and the max fatigue damage occurs on the riser＇s boundary area,the peak of fatigue damage upsurges as the current speed increase.
出处
《中国舰船研究》
2010年第5期54-58,63,共6页
Chinese Journal of Ship Research
基金
国家自然科学基金资助(50921001)
国家重点基础研究发展计划资助项目(2010CB832700)
关键词
钢悬链式立管
涡激振动
疲劳损伤
模态分析
steel catenary riser
vortex induced vibration
fatigue damage
modal analysis
