论文成果
An improved model for VIV fatigue life prediction of slender marine structures in time-varying flows
摘要:The objective of this study is to propose an improved model to evaluate the fatigue life of slender marine structures with high efficiency and accuracy. We establish two Weibull functions to represent the probability density function (PDF) of time-varying flow velocities and fatigue stress. Next, a modified Latin hypercube sampling method is developed to improve the efficiency by reducing the sampling number based on the characteristics of vortex-induced vibrations. In addition, we employ the response surface method to predict the dominant mode and select the truncation order. This method could make the calculation time of each stress amplitude within 0.1-4s, which meets the requirement for efficiency. To further improve the calculation accuracy, the Strouhal number used in the wake oscillator model is considered to change with the reduced velocity by introducing a correction factor. Besides, the influence of the tension fluctuation from axial vibration on fatigue damage is taken into consideration. A good agreement is achieved in the comparison between the numerical and experimental results. Moreover, the improvement of the accuracy and the efficiency of the proposed model is validated. In the end, a parametric study is conducted to investigate the effect of flow PDF parameters on the fatigue life.
关键字:Latin hypercube sampling Vortex-induced vibration Fatigue life Response surface method Strouhal number
ISSN号:0948-4280
卷、期、页:卷: 24 期: 2 页: 490-499
发表日期:2018-06-13
影响因子:0.000000
收录情况:SCIE(科学引文索引网络版),ESI(基本科学指标数据库)
发表期刊名称:JOURNAL OF MARINE SCIENCE AND TECHNOLOGY
参与作者:贾旭
通讯作者:许京,余阳
第一作者:段梦兰,顾继俊,王莹莹
论文类型:期刊论文
论文概要:许京,贾旭,段梦兰,顾继俊,余阳,王莹莹,An improved model for VIV fatigue life prediction of slender marine structures in time-varying flows,JOURNAL OF MARINE SCIENCE AND TECHNOLOGY,2018,卷: 24 期: 2 页: 490-499
论文题目:An improved model for VIV fatigue life prediction of slender marine structures in time-varying flows