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System identification of the kinematics of an oscillating cylinder using wake velocities

机译:使用尾流速度的摆动缸运动学系统识别

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A classical problem in vortex-induced vibration is to know the flow field past an oscillating cylinder. In this paper we use system theory to identify the oscillatory behaviour of a circular cylinder from flow variables in the wake. We use numerical simulations (CFD) of the flow past a cylinder oscillating in the cross-flow direction at different oscillation frequencies and amplitudes to construct a transfer function that relates the displacement of the cylinder and the resulting flow field. This transfer function can then be inverted to 'predict' the displacement of the cylinder given the flow field (as determined by simulations or measurements). We investigate this technique in the so-called lock-in region, where the vortex shedding frequency is synchronised with the oscillation frequency of the cylinder.
机译:涡流引起的振动中的一个经典问题是知道流过振荡圆柱的流场。在本文中,我们使用系统理论从尾流中的流量变量识别圆柱体的振荡行为。我们使用数值模拟(CFD)来分析通过圆柱体的流体,该流体在不同的振荡频率和振幅下沿横向流动方向振荡,以构建传递函数,该函数将圆柱体的位移与所产生的流场相关联。然后,可以根据给定的流场(通过模拟或测量确定),将该传递函数取反以“预测”气缸的位移。我们在所谓的锁定区域研究这种技术,在该区域涡流脱落频率与圆柱体的振荡频率同步。

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