Nonlinear Dynamics

, Volume 92, Issue 3, pp 1225–1241 | Cite as

Intermittency in pitch-plunge aeroelastic systems explained through stochastic bifurcations

  • J. Venkatramani
  • Sunetra Sarkar
  • Sayan Gupta
Original Paper


Aeroelastic systems with hardening nonlinearity exhibit supercritical Hopf bifurcation when the flow velocity exceeds a critical velocity leading to self-sustaining large amplitude limit cycle oscillations known as flutter. This study investigates the effects of irregular fluctuations in the flow on the dynamical stability characteristics of a two-degree-of-freedom pitch-plunge aeroelastic system with hardening nonlinearity. Dynamical or D-bifurcations are investigated through the computation of the largest Lyapunov exponent, while phenomenological or P-bifurcation analysis is carried out by examining the structure of the joint probability density function of the response quantities and their instantaneous time derivatives. The qualitative nature of P-bifurcation analysis makes it difficult to pinpoint the regimes of different response dynamics. In the light of this difficulty, a quantitative analysis using the Shannon entropy measure has been undertaken to quantify the P-bifurcation regime. This regime is shown to be coincident with the intermittency regime observed in the response time histories prior to flutter oscillations in fluctuating flows.


Aeroelastic flutter Random flows Hopf bifurcation Intermittency D-bifurcation P-bifurcation 


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Authors and Affiliations

  1. 1.Department of Applied MechanicsIndian Institute of Technology MadrasChennaiIndia
  2. 2.Department of Aerospace EngineeringIndian Institute of Technology MadrasChennaiIndia

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