Author(s)

J. Naprstek

Abstract

The paper investigates the stochastic stability of a cross-wind movement influenced by parametric noises generated by the interaction of a moving bluff body and an air flow. Conditions of the loss or resumption of movement stability by means of the stochastic version of Lyapunov function are derived. Subcritical and various types of the supercritical modes of system response combining the deterministic and the stochastic response components are investigated. These effects are verified by several mathematical models of non-linear damping. There has been shown a different response sensitivity to the mathematical model in the individual domains of stochastic instability which makes posiible to explain some paradoxes known from wind channel tests. 1 Introduction Slender civil engineering structures are subjected t

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