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Isola in a linear one-degree-of-freedom feedback system with actuator rate saturation

International Journal of Mechanical System Dynamics 2023年第3期3卷 186-191页

作者： Duc H.Nguyen Thomas L.Hill Mark H.Lowenberg Faculty of Engineering University of BristolBristolUK

This short communication uses numerical continuation to highlight the existence of an isola in a simple one-degree-of-freedom harmonically forced feedback system with actuator rate limiting as its only nonlinear *** was found that the isola(1)contains only rate-limited responses,(2)merges with the main branch when the forcing amplitude is sufficiently large,and(3)includes stable solutions that create a second attractor in regions where rate limiting is not ***,the isola is composed of two solutions for a given forcing *** solutions have the same amplitudes in the state(pitch rate)projection;however,they have distinct phases,and their amplitudes are also distinct when projected onto the integrator state in the *** rich dynamics observed in such a simple example underlines the impact of rate limiting on feedback ***,the combination of feedback and rate limiting can create detrimental dynamics that is hard to predict and requires careful analysis.

关键词： frequency response harmonic forcing rate saturation isola dynamical system

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Circular cylinder wakes and their control under the influence of oscillatory flows: A numerical study

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Journal of Ocean Engineering and Science 2021年第4期6卷 389-399页

作者： Sridhar Muddada K.Hariharan V.S.Sanapala B.S.V.Patnaik Ocean Structures National Institute of Ocean TechnologyPallikaraniChennai 600100India Vikram Sarabhai Space Centre ThiruvananthapuramKerala 695022India Indira Gandhi Centre for Atomic Research Homi Bhabha National InstituteKalpakkam 603102India Department of Applied Mechanics Indian Institute of Technology MadrasChennai 600036India

Understanding and control of wake vortices past a circular cylinder is a cardinal problem of interest to ocean *** wake formation and vortex shedding behind a variety of ocean structures such as spars,are subjected to fatigue failure limiting their life *** additional influences due to ocean waves and currents further exacerbate these *** the present study,flow past an isolated circu-lar cylindrical structure subjected to an oscillatory upstream are numerically *** studies involve high resolution simulations over the low Reynolds number range(100-200).Although the prac-tical range of interest is in high Reynolds number range of 103-105,the flow physics and a number of qualitative and quantitative aspects are similar to the low Reynolds number *** the high Reynolds number range,statistical averaging tools in conjunction with suitable closure models would be *** control of wake vortices is achieved with the aid of two small rotors located in the aft of the main cylinder.A control algorithm was coupled to determine the quantum of actuation to the rotating *** control of wake vortices was observed for harmonic in-let forcing,residual vortical structures were found to persist at higher amplitudes of *** study the efficacy of this control,numerical simulations were further extended,when the circular cylinder was flexibly *** con-trol of flow induced vibrations was observed to be reasonably effective in controlling the wake generated behind the main cylinder due to oscillatory upstream.

关键词： Active flow control Vortex shedding Flow-induced vibrations harmonic forcing Fluid-structure interaction Computational fluid dynamics

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