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首页> 外文期刊>Journal of Fluids and Structures >Active vortex-induced vibration control of a circular cylinder at low Reynolds numbers using an adaptive fuzzy sliding mode controller
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Active vortex-induced vibration control of a circular cylinder at low Reynolds numbers using an adaptive fuzzy sliding mode controller

机译：使用自适应模糊滑模控制器的低雷诺数下的圆柱主动涡激振动控制

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An adaptive fuzzy sliding mode control (AFSMC) scheme is applied to actively suppress the two-dimensional vortex-induced vibrations (VIV) of an elastically mounted circular cylinder, free to move in in-line and cross-flow directions. Laminar flow regime at Re=90, low non-dimensional mass with equal natural frequencies in both directions, and zero structural damping coefficients, are considered. The natural oscillator frequency is matched with the vortex shedding frequency of a stationary cylinder at Re=100. The strongly coupled unsteady fluid/cylinder interactions are captured by implementing the moving mesh technology through integration of an in-house developed User Define Function (UDF) into the main code of the commercial CFD solver Fluent. The AFSMC approach comprises of a fuzzy system designed to mimic an ideal sliding-mode controller, and a robust controller intended to compensate for the difference between the fuzzy controller and the ideal one. The fuzzy system parameters as well as the uncertainty bound of the robust controller are adaptively tuned online. A collaborative simulation scheme is realized by coupling the control model implemented in Matlab/Simulink to the plant model constructed in Fluent, aiming at determination of the transverse control force required for complete suppression of the cylinder streamwise and cross-flow oscillations. The simulation results demonstrate the high performance and effectiveness of the adopted control algorithm in attenuating the 2D-VIV of the elastic cylinder over a certain flow velocity range. Also, the enhanced transient performance of the AFSM control strategy in comparison with a conventional PID control law is demonstrated. Furthermore, the effect of control action on the time evolution of vortex shedding from the cylinder is discussed. In particular, it is observed that the coalesced vortices in the far wake region of the uncontrolled cylinder, featuring the C(2S)-type vortex shedding characteristic mode, are ultimately forced to switch to the classical von Karman vortex street of 2S-type mode, displaying wake vortices of moderately weaker strengths very similar to those of the stationary cylinder. Lastly, robustness of AFSMC is verified against relatively large structural uncertainties as well as with respect to a moderate deviation in the uniform inlet flow velocity.
机译：应用自适应模糊滑模控制（AFSMC）方案来主动抑制弹性安装的圆柱的二维涡激振动（VIV），该自由在轴向和错流方向上移动。考虑到Re = 90时的层流状态，在两个方向上具有相同固有频率的低无量纲质量以及零结构阻尼系数。在Re = 100时，固有振荡器频率与固定圆柱体的涡旋脱落频率匹配。通过将内部开发的用户定义功能（UDF）集成到商用CFD求解器Fluent的主要代码中，通过实施移动网格技术，可以捕获高度耦合的非稳态流体/圆柱体相互作用。 AFSMC方法包括设计成模仿理想滑模控制器的模糊系统和旨在补偿模糊控制器与理想控制器之间的差异的鲁棒控制器。在线自适应地调整模糊系统参数以及鲁棒控制器的不确定性范围。通过将在Matlab / Simulink中实现的控制模型与在Fluent中构建的工厂模型耦合，可以实现协同仿真方案，其目的是确定完全抑制气缸的流向和横流振荡所需的横向控制力。仿真结果表明，所采用的控制算法在一定流速范围内衰减弹性圆柱体的2D-VIV的高性能和有效性。此外，与传统的PID控制定律相比，AFSM控制策略的瞬态性能得到了增强。此外，还讨论了控制动作对涡流从圆柱体脱落的时间演变的影响。特别是，观察到以C（2S）型涡流脱落特征模式为特征的不受控制圆柱体的远尾区域中的聚结涡流最终被迫切换为2S型模式的经典von Karman涡街，显示出强度稍弱的尾流涡流，与固定圆柱的涡流非常相似。最后，针对相对较大的结构不确定性以及均匀进口流速的适度偏差，验证了AFSMC的坚固性。

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