表面缺陷对圆柱体涡激振动和驰振模态影响机制实验研究

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振动与冲击 ›› 2025, Vol. 44 ›› Issue (10) : 76-83.

振动理论与交叉研究

表面缺陷对圆柱体涡激振动和驰振模态影响机制实验研究

张伟国1，饶志华1,2，苏峰1，姜俊川3，刘坤翔1，倪问池*3

作者信息 +

Experimental study on the influence mechanism of surface defects on vortex induced vibration and galloping modes of a cylinder

ZHANG Weiguo1，RAO Zhihua1,2，SU Feng1，JIANG Junchuan3，LIU Kunxiang1，NI Wenchi*3

Author information +

文章历史 +

摘要

涡激振动（VIV）是细长海洋结构（如隔水管和井口）疲劳损伤的一个重要因素，必须在设计中予以考虑。目前，预测此类结构涡激振动的工程方法通常依赖于圆柱体的VIV数据库，但未能考虑因腐蚀等因素导致的表面缺陷。因此，预测结果可能忽略由表面缺陷引起的振动放大效应，导致低估结构振动幅度和疲劳损伤。针对这一问题，通过模型试验，分析了具有不同缺陷深度和来流角度的缺陷圆柱体的流致振动响应特性。结果表明，缺陷圆柱体的模态特性复杂，表现出多种模式，如驰振、涡振和共振模式。表面缺陷会激发驰振模态，并显著增加圆柱体的振动幅度，最大可达7.5倍。在攻角为0°时，缺陷圆柱体表现出最高的振动幅度和最大的共振范围，然而，在攻角接近90°时，缺陷圆柱体的振幅急剧降低且低于完整圆柱体。表面缺陷也会抑制涡振模态，进而抑制驰振，圆柱在7.5%的缺陷深度下有最大驰振振幅。此外，表面缺陷还会导致共振的流速区间范围增大。

Abstract

Vortex-induced vibration (VIV) is a crucial contributor to the fatigue damage of slender marine structures such as offshore risers and wellhead and must be accounted for during design. Currently, engineering methods that predict VIV for such structures commonly rely on VIV databases for cylinders but fail to account for surface defects resulting from factors such as corrosion. Therefore, resulting predictions may overlook the magnification effect of vibration caused by surface defects, leading to an underestimation of structural vibration amplitude and fatigue damage. To address this issue, a model experiment was conducted to analyze the flow-induced vibration response characteristics of defective cylinders with varying defect depths and incoming flow angles. The results showed that the modal properties of the defective cylinder were complex, exhibiting several modes such as galloping, VIV, and resonance modes. Surface defects can induce galloping vibration mode and significantly increase the cylinder's vibration amplitude, up to a maximum of 7.5 times. Furthermore, at an attack angle of 0°, the defective cylinder demonstrated the highest amplitude and largest resonance range, while at an attack angle approaching α=90°, the amplitude of the defective cylinder sharply decreased and was lower than that of the intact cylinder. Surface defects can also suppress vortex vibration modes, thereby suppressing galloping. The cylinder had the maximum galloping amplitude at a defect depth of 7.5%. In addition, surface defects can also lead to an increase in the range of resonance flow velocity.

导出引用

张伟国1, 饶志华1, 2, 苏峰1, 姜俊川3, 刘坤翔1, 倪问池3. 表面缺陷对圆柱体涡激振动和驰振模态影响机制实验研究[J]. 振动与冲击, 2025, 44(10): 76-83

ZHANG Weiguo1, RAO Zhihua1, 2, SU Feng1, JIANG Junchuan3, LIU Kunxiang1, NI Wenchi3. Experimental study on the influence mechanism of surface defects on vortex induced vibration and galloping modes of a cylinder[J]. Journal of Vibration and Shock, 2025, 44(10): 76-83

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