水下跨接管作为水下生产设施的核心组成构件，易在海流作用下发生涡激振动（vortex-induced vibration，VIV）现象，导致结构疲劳损伤。目前国内外针对跨接管的涡激振动试验研究甚少，对其涡激振动响应特征的认识仍为空白。为此，本文开展了面外均匀流中π型水下跨接管涡激振动机理性试验，通过模态分析法、小波变换等数据处理方法对不同流速下的应变数据进行分析，得到结论如下：在面外均匀流中，π型跨接管顺流向（IL方向）与横流向（CF方向）主导频率呈现出与单根立管所不同的3倍、4倍频率比；π型跨接管CF和IL方向应变随流速的增加呈现出一个主导模态下类似一个倒二次函数的变化规律，且两个方向上的应变峰值均出现在同一流速下。

As the core component of underwater production facilities, subsea jumpers are likely to encounter vortex-induced vibration (VIV) in the ocean currents, which may lead to fatigue damage to the structure. However, the lack of experimental investigation of the VIV of jumpers resulted in a gap in exploring their VIV response characteristics. To address this gap, an experiment of a π-shaped jumper on VIV is carried out in uniform flow outside the plane with the aim of mechanistic research, and the strain data under different flow velocities are analyzed with common methods such as modal analysis and wavelet transform. It is found that the π-shaped jumper shows the dominant frequency ratios between the in-line (IL) and cross-flow (CF) directions of 3 and 4, differing from that of a single riser in the uniform flow outside the plane. The amplitude of strain in both CF and IL directions follows a variation pattern resembling an inverted quadratic curve under the dominant mode as the flow velocity increases, with peak values in both directions occurring at the same flow velocity.