方形棱柱涡激压力空间相关性研究

朱乐东1,2,3,陈修煜1,2

振动与冲击 ›› 2019, Vol. 38 ›› Issue (8) : 42-47.

PDF(2274 KB)
PDF(2274 KB)
振动与冲击 ›› 2019, Vol. 38 ›› Issue (8) : 42-47.
论文

方形棱柱涡激压力空间相关性研究

  • 朱乐东1,2,3,陈修煜1,2
作者信息 +

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

  • ZHU Ledong 1,2,3   CHEN Xiuyu 1,2
Author information +
文章历史 +

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。本文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。

Abstract

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

Key words

square prism section model / span-wise correlation / chord-wise correlation / vortex-induced pressure

引用本文

导出引用
朱乐东1,2,3,陈修煜1,2. 方形棱柱涡激压力空间相关性研究[J]. 振动与冲击, 2019, 38(8): 42-47
ZHU Ledong 1,2,3 CHEN Xiuyu 1,2 . Spatial correlation of vortex-induced pressure of a square prism section model[J]. Journal of Vibration and Shock, 2019, 38(8): 42-47

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