Extracting energy from a flow: An asymptotic approach using vortex-induced vibrations and feedback control
Extracting energy from a flow: An asymptotic approach using vortex-induced vibrations and feedback control
复制标题
DOI：
10.1016/j.jfluidstructs.2011.03.005
复制
发表时间：
2011-07-01
影响因子：
3.6
通讯作者：
Gallaire, Francois
中科院分区：
文献类型：
--
作者：
Meliga, Philippe;Chomaz, Jean-Marc;Gallaire, Francois
本文研究了用于可再生能源生产的水流中圆柱的涡激振动。我们使用作者最近从流体-圆柱体耦合系统的渐近分析中获得的分析模型，并评估了施加在圆柱壁上的控制速度来优化待收集的耗散能量的大小的能力。保留的方法是比例反馈控制方法。当系统在其极限环上演化时，我们证明了该控制产生的平均耗散能量增加了3.5%，并且对结构参数的微小误差有显著的鲁棒性改善。然而，我们也证明了当受到外部扰动时，由于同时存在多个稳定循环，系统容易收敛到较低能量的循环。因此，我们提出了一种暂态控制算法，旨在迫使系统返回到其最优周期。根据不同类型的测量，对两种反馈方法的效率进行了评估：我们发现，达到最佳循环收敛所需的时间存在显著差异，这最终导致在根据气缸测量设计反馈时消耗能量，以及在根据流量测量设计反馈时利用能量。(C)2011爱思唯尔有限公司。保留所有权利。
This paper considers vortex-induced vibrations of a cylinder in water streams for renewable energy production. We use an analytical model recently obtained by the authors from the asymptotic analysis of a coupled flow-cylinder system, and assess the ability of a control velocity applied at the cylinder wall to optimize the magnitude of dissipated energy at disposal to be harvested. The retained approach is that of proportional feedback control. When the system evolves on its limit cycle, we show that the control yields an increase in the mean dissipated energy by 3.5%, as well as a significant improvement of the robustness with respect to small inaccuracies of the structural parameters. However, we also show that the system is susceptible to converge to cycles of lower energy when subjected to external disturbances, as a result of the simultaneous existence of multiple stable cycles. Consequently, we propose a transient control algorithm meant to force the return of the system to its optimal cycle. Its efficiency is assessed for two feedback approaches relying on distinct types of measurements: we find significant differences in the time needed to reach convergence to the optimal cycle, which ultimately results in energy being spent when feedback is designed from cylinder measurements, and in energy being harnessed when feedback is designed from flow measurements. (C) 2011 Elsevier Ltd. All rights reserved.