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首页> 外文期刊>Journal of offshore mechanics and arctic engineering >Two Tandem Cylinders With Passive Turbulence Control in Flow-Induced Vibration: Relation of Oscillation Patterns to Frequency Response
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Two Tandem Cylinders With Passive Turbulence Control in Flow-Induced Vibration: Relation of Oscillation Patterns to Frequency Response

机译：在流动引起的振动中具有被动湍流控制的两个串联汽缸：振荡模式与频率响应的关系

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Flow-induced vibrations (FIV) are conventionally destructive and should be suppressed. Since 2006, the Marine Renewable Energy Laboratory (MRELab) of the University of Michigan has been studying FIV of multiple cylinders to enhance their response for har-nessing hydrokinetic power from ocean, river, and tidal currents. Interactions between multiple cylinders in FIV enable high power-to-volume ratio in a converter consisting of multiple oscillators. This paper investigates experimentally the relation between oscillation patterns and frequency response of two cylinders in tandem. All experiments are conducted in the recirculating channel of the MRELab for 30,000 Re 120,000. Phase analysis reveals three dominant patterns of oscillation of two tandem cylinders by calcu-lating the instantaneous phase difference between the two cylinders. This phase differ-ence characterizes each major pattern. Pattern A is characterized by small lead or lag of one cylinder over the other. In pattern B, there is nearly 180 deg out of phase oscillations between the cylinders. In pattern C, the instantaneous phase difference changes continuously from -180 deg to +180 deg. Using frequency spectra and amplitude response, oscillation characteristics of each cylinder are revealed in vortex-induced vibration (VIV) and galloping. Pattern A occurs mostly in galloping when the first cylinder has higher stiffness. Pattern B occurs seldom and typically in the initial VIV branch and tran-sition from VIV to galloping. Pattern C occurs in the upper and lower VIV branches; and in galloping when the lead cylinder has lower stiffness.
机译：流动引起的振动（FIV）通常具有破坏性，应予以抑制。自2006年以来，密歇根大学的海洋可再生能源实验室（MRELab）一直在研究多气瓶的FIV，以增强其对利用海洋，河流和潮流产生的水动力的反应。 FIV中多个气缸之间的相互作用使由多个振荡器组成的转换器具有很高的功率体积比。本文以串联方式研究了两个气缸的振动模式与频率响应之间的关系。所有实验都是在MRELab的再循环通道中进行的30,000

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