When two circular cylinders are closely arranged in parallel, the downstream cylinder frequently exhibits wake-induced vibrations (WIVs). This study investigates the classifications of WIVs in various arrangements of cylinders by considering the generation mechanisms of WIVs through a series of wind tunnel tests. The generation mechanisms are defined through flutter and time-history analyses using the quasi-steady theory. Finally, this study suggests a classification map of the arrangements with four types of generation mechanisms: vertical flutter, anti-phase coupled flutter, in-phase coupled flutter (quasi-steady applicable), and in-phase coupled flutter (quasi-steady inapplicable). Vertical flutter occurs in closely staggered cylinders and tandem cylinders with a horizontal center distance measuring 2.5–9.5 times the cylinder diameter. A key parameter for distinguishing coupled flutter is the contribution of the aerodynamic coupling terms. Furthermore, for closely staggered cylinders, two types of vibrations occur, depending on the reduced wind velocity. The arrangement of the two cylinders is slightly changed because of the static displacement of the downstream cylinder depending on the wind velocity, resulting in a change in the generation mechanism. The results pertaining to the generation mechanisms effectively explain the WIV responses of the two cylinders in various arrangements.

当两个圆柱体紧密平行排列时，下游圆柱体经常表现出尾流引起的振动 (WIV)。本研究通过一系列风洞试验考虑 WIVs 的产生机制，研究了在不同气缸排列下 WIVs 的分类。生成机制是通过使用准稳态理论的颤振和时程分析来定义的。最后，本研究提出了具有四种产生机制的排列分类图：垂直颤振、反相耦合颤振、同相耦合颤振（准稳态适用）和同相耦合颤振（准稳态不适用） ）。垂直颤振发生在紧密交错的气缸和串联气缸中，水平中心距为气缸直径的 2.5-9.5 倍。区分耦合颤振的一个关键参数是空气动力耦合项的贡献。此外，对于紧密交错的圆柱体，根据降低的风速，会发生两种类型的振动。由于下游圆柱体的静态位移取决于风速，因此两个圆柱体的布置略有变化，从而导致发电机制发生变化。与生成机制有关的结果有效地解释了两个气缸在各种布置中的 WIV 响应。由于下游圆柱体的静态位移取决于风速，因此两个圆柱体的布置略有变化，从而导致发电机制发生变化。与生成机制有关的结果有效地解释了两个气缸在各种布置中的 WIV 响应。由于下游圆柱体的静态位移取决于风速，因此两个圆柱体的布置略有变化，从而导致发电机制发生变化。与生成机制有关的结果有效地解释了两个气缸在各种布置中的 WIV 响应。