方形棱柱涡激压力空间相关性研究  

Spatial correlation of vortex-induced pressure of a square prism section model

作　　者：朱乐东[1,2,3] 陈修煜 ZHU Ledong;CHEN Xiuyu(State Key Laboratory of Disaster Reduction in Civil Engineering,Tongji University,Shanghai 200092,China;College of Civil Engineering,Tongji University,Shanghai 200092,China;Key Laboratory of Wind Resistance Technology of Bridges of Ministry of Transport,Tongji University,Shanghai 200092,China)

机构地区：[1]同济大学土木工程防灾国家重点实验室,上海200092 [2]同济大学土木工程学院,上海200092 [3]同济大学桥梁结构抗风技术交通行业重点实验室,上海200092

出　　处：《振动与冲击》2019年第8期42-47,60,共7页Journal of Vibration and Shock

基　　金：国家自然科学基金面上项目(51478360);国家自然科学基金优秀国家重点实验室项目(51323013)

摘　　要：涡激共振是一种具有强迫和自激双重特性的非线性自限幅风致振动现象,目前对涡激共振的研究大多局限于二维涡激力非线性特性和数学模型,对涡激力的跨向相关性研究相对较少。采用方形棱柱节段模型,进行固定与弹簧悬挂两种状态下测压测振风洞试验,分析了固定与涡激共振两种情况时,作用于方形棱柱截面上的涡激压力沿跨向与截面的相关性规律。研究发现:涡激共振时棱柱断面涡激压力的跨向相关性好,并随跨向间距增加而衰减,同时振幅增大明显提高涡激压力跨向相关性;静止模型的涡激压力跨向相关性要差得多,随着跨向间距的增加相关系数下降至接近于0;截面不同测点涡激压力相关性不同,差异较大。Vortex-induced vibration is a kind of wind-induced nonlinear self-limiting vibration with both forced and self-excited characteristics. Current research on vortex-induced vibration is mostly confined to the two-dimensional nonlinear mathematical model of vortex-induced force, and the span-wise correlation research is relatively less. In this paper, the square prismatic section model was used in the fixed and spring suspended wind tunnel test to analyze the span-wise correlation and chord-wise correlation of vortex-induced pressure in the static condition and vortex-induced resonance two cases. It was found that the span-wise correlation of the vortex-induced pressure is good when in resonance, it decays along the bridge span and is significantly increased with the amplitude. The correlation is much worse in static condition, the correlation coefficient decreases close to 0 with the increase of the span-wise distance. The correlation rule of vortex-induced pressure varies a lot in different points.

关 键 词：方形棱柱节段模型 沿截面相关性 跨向相关性 涡激压力 

分 类 号：TH212[机械工程—机械制造及自动化] TH213.3