Galloping and VIV control of square-section cylinder utilizing direct opposing smart control force

Document Type: Full Length Article

Author

School of Mechanical Engineering, Arak University of Technology, Arak, Iran.

10.22064/tava.2019.113251.1144

Abstract

An adaptive fuzzy sliding mode controller (AFSMC) is adopted to reduce the 2D flow-induced vibration of an elastically supported square-section cylinder, free to oscillate in stream-wise and
transverse directions in both lock-in and galloping regions. The AFSMC strategy consists of a fuzzy logic inference system intended to follow a sliding-mode controller (SMC), and a robust control system designed to retrieve the variance between the sliding mode and fuzzy controllers.  The sprung square cylinder first experiences vortex-induced vibrations with increasing Reynolds number, and then, after passing the critical flow velocity, it confronts high-amplitude and low-frequency
vibrations of galloping owning to its sharp corners. A co-simulation platform is considered by linking the AFSMC system modeled in Matlab/Simulink to the plant model implemented in Fluent, aiming at the calculation of opposite control force needed for comprehensive annihilation of the cylinder motions. Based on the performed numerical simulations, it becomes clear that the utilized active control system has successfully mitigated the two-degree-of-freedom vibrations of a square cylinder in both the lock-in region and galloping zone. Here, the vibration amplitudes in the transverse and
streamwise directions have decreased by 93% and 94%, for the lock-in region and 93% and 99%, for the galloping zone, respectively.

Highlights

  • The AFSM control strategy is adopted to reduce the 2D FIV of a sprung square-section cylinder.
  • The cylinder is free to vibrate in streamwise and transverse directions in lock-in and galloping regions.
  • The AFSMC strategy consists of a fuzzy logic inference system and a robust controller.
  •  A co-simulation platform is considered by linking the AFSMC system to the plant CFD model.
  •  The controller has effectively reduced the vibrations of cylinder in the lock-in and galloping regions.

Keywords


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