Frequency characteristics and phase dynamics of a stochastic vortex induced vibration system

Aswathy, M; Sarkar, Saswati

doi:10.1016/j.jsv.2021.116230

Cited by 9 publications

(8 citation statements)

References 34 publications

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“…If the oscillators are perfectly synchronized, the RPV becomes constant, representative of 'phase locking'. However, it is often seen for the experimental data that the RPV is fluctuating but bounded in nature 13,15,16 (see Fig. 1(a)).…”

Section: A Cursory Glance Into Synchronization Theorymentioning

confidence: 98%

“…1(c)). Intermittent phase synchronization is accompanied by 'phase slips' 13,14,16 , having jumps of integer multiples of 2π. Such phase slips mark an imperfect or weak phase synchronization.…”

Section: A Cursory Glance Into Synchronization Theorymentioning

confidence: 99%

“…Addressing this end of the hitherto gap is the prime focus of this paper. Dynamic transitions in nonlinear systems (be it deterministic or stochastic) can be directly correlated with the transitions in relative phases and frequencies between the oscillators and their mutual synchronization [13][14][15][16] . Deriving impetus from the same, the present study focuses on experimental investigations on the nonlinear dynamics of stall flutter with and without the input noise, from the viewpoint of synchronization framework.…”

Section: Introductionmentioning

confidence: 99%

“…Synchronization is a well-known nonlinear phenomenon and has been widely reported in different nonlinear dynamical systems, such as cardiorespiratory systems 17 , electrochemical oscillators 18,19 , electronic circuits 20 , thermoacoustics 15,[21][22][23][24] , vortex-induced vibration systems 16,25 , and aeroelastic systems 13,26,27 . Synchronization phenomenon can be classified in a variety of forms, such as complete synchronization, lag synchronization, intermittent phase synchronization, imperfect phase synchronization, among others 13,14,[28][29][30] .…”

Section: Introductionmentioning

confidence: 99%

“…The response dynamics of such nonlinear dynamical systems show rich bifurcation behaviour with different phase relationships such as phase locking, phase drifting, phase slips 13,14,16,18,27,31 and a switch between in-phase to anti-phase synchronization, known as phase-flip bifurcation 19,20,32 ; see Section II for further details.…”

Section: Introductionmentioning

confidence: 99%

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Experimental investigation on the synchronization characteristics of a pitch-plunge aeroelastic system exhibiting stall flutter

Tripathi

Shreenivas

Bose

et al. 2022

Chaos: An Interdisciplinary Journal of Nonlinear Science

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This study focuses on characterizing the bifurcation scenario and the underlying synchrony behavior in a nonlinear aeroelastic system under deterministic as well as stochastic inflow conditions. Wind tunnel experiments are carried out for a canonical pitch-plunge aeroelastic system subjected to dynamic stall conditions. The system is observed to undergo a subcritical Hopf bifurcation, giving way to large-amplitude limit cycle oscillations (LCOs) in the stall flutter regime under the deterministic flow conditions. At this condition, we observe intermittent phase synchronization between pitch and plunge modes near the fold point, whereas synchronization via phase trapping is observed near the Hopf point. Repeating the experiments under stochastic inflow conditions, we observe two different aeroelastic responses: low amplitude noise-induced random oscillations (NIROs) and high-amplitude random LCOs (RLCOs) during stall flutter. The present study shows asynchrony between pitch and plunge modes in the NIRO regime. At the onset of RLCOs, asynchrony persists even though the relative phase distribution changes. With further increase in the flow velocity, we observe intermittent phase synchronization in the flutter regime. To the best of the authors’ knowledge, this is the first study reporting the experimental evidence of phase synchronization between pitch and plunge modes of an aeroelastic system, which is of great interest to the nonlinear dynamics community. Furthermore, given the ubiquitous presence of stall behavior and stochasticity in a variety of engineering systems, such as wind turbine blades, helicopter blades, and unmanned aerial vehicles, the present findings will be directly beneficial for the efficient design of futuristic aeroelastic systems.

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Section: A Cursory Glance Into Synchronization Theorymentioning

confidence: 98%

Section: A Cursory Glance Into Synchronization Theorymentioning

confidence: 99%