论文标题
垂直，悬臂的重新配置和振荡，可进行涡旋脱落
Reconfiguration and oscillations of a vertical, cantilevered-sheet subject to vortex-shedding
论文作者
论文摘要
这里研究了在长狭窄的水通道中因bénard-kàrmàn涡流引起的周期性强迫而导致的薄密度聚乙烯表的动力学。特别是，考虑了时间平均的板偏转及其振荡振幅。首先说明了前者是通过浮力，弹性恢复力和基于深度平均水速的曲线阻力之间的静态平衡来良好的。我们的观察结果还表明，上游涡流的存在阻碍了整体重新配置效应，这在原本稳定的流动中众所周知。对于板尖端振荡，基于扭转 - 弹簧安装的平板的简单模型正确捕获了在各种薄板物理性能和流动条件上的测量尖端振幅。此外，据报道，据报道，据报道，由于板唤醒，多频率和模态响应，包括涡旋式振动，锁定式振动，流动诱导的振动，包括涡旋式振动，锁定振动的富裕现象学。
The dynamics of a thin low-density polyethylene sheet subject to periodic forcing due to Bénard-Kàrmàn vortices in a long narrow water channel is investigated here. In particular, the time-averaged sheet deflection and its oscillation amplitude are considered. The former is first illustrated to be well-approximated by the static equilibrium between the buoyancy force, the elastic restoring force, and the profile drag based on the depth-averaged water speed. Our observations also indicate that the presence of upstream vortices hinder the overall reconfiguration effect, well-known in an otherwise steady flow. For the sheet tip oscillations, a simple model based on torsional-spring-mounted flat plate correctly captures the measured tip amplitude over a wide range of sheet physical properties and flow conditions. Furthermore, a rich phenomenology of structural dynamics including vortex-forced-vibration, lock-in with the sheet natural frequency, flow-induced vibration due to the sheet wake, multiple-frequency and modal response is reported.
