湖南大学学报（自然科学版）2024，Vol.51Issue(5)：132-142,11.DOI:10.16339/j.cnki.hdxbzkb.2024055
∏型断面竖向涡振过程气动力不同分量的演变特性
Evolution Characteristics of Different Components of Aerodynamics During Vertical Vortex-induced Vibration of Π-shaped Girder
摘要
Abstract
Compared with the traditional streamlined box girder,the typical Π-shaped open section is prone to vortex-induced vibration(VIV)because of its high section bluff configuration.In this research,the simultaneous vibration and pressure vibration of wind tunnel tests and computational fluid dynamics(CFD)are used for studying the characteristics of the pressure distribution along the surface of the typical open section and the nonlinear phenomena such as different aerodynamic components and hysteresis characteristics.First,the initial characteristics of the local pressure in different periods in the VIV lock-on region are analyzed.Secondly,the CFD dynamic grid method is used to realize the fluid-solid coupling analysis of the section.On this basis,the different frequency components of the aerodynamic forces in the VIV process are decomposed by the Hilbert vibration decomposition(HVD)method.The research results show that the average surface pressure on the leading edge of the opening section is in the negative pressure zone,where the airflow is separated.At the extreme point of the VIV,the pulsating pressure changes most violently in the area of 0.1<X/B<0.3,indicating that the vortex shedding intensity is the largest in this region,and the analysis shows that the aerodynamic forces on the opening section have obvious high-order components.Due to the existence of high-order harmonic components,the degree of nonlinearity of aerodynamic force is continuously deepened,and the work done by each order component of aerodynamic force has different characteristics in one whole vibration period.Among them,the first-order component F1 of the aerodynamic force exhibits a curvilinear increase in work during the vibration period,showing an overall increasing trend.The hysteresis curve of the second-order component F2 of the aerodynamic force presents a complex"8"ring shape.The influence of the third-order and above components on the VIV system can be ignored.关键词
桥梁工程/风洞试验/开口断面/计算流体动力学/希尔伯特振动分解Key words
bridge engineering/wind tunnel test/open-section/computational fluid dynamics/Hilbert vibration decomposition分类
交通工程引用本文复制引用
马振兴,李加武,赵国辉,王峰,郝键铭..∏型断面竖向涡振过程气动力不同分量的演变特性[J].湖南大学学报（自然科学版）,2024,51(5):132-142,11.基金项目
国家自然科学基金资助项目(51978077),National Natural Science Foundation of China(51978077) （51978077）
