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Passive suppression of helicopter ground resonance instability by means of a strongly nonlinear absorber
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 Title & Authors
Passive suppression of helicopter ground resonance instability by means of a strongly nonlinear absorber
Bergeot, Baptiste; Bellizzi, Sergio; Cochelin, Bruno;
In this paper, we study a problem of passive suppression of helicopter Ground Resonance (GR) using a single degree freedom Nonlinear Energy Sink (NES), GR is a dynamic instability involving the coupling of the blades motion in the rotational plane (i.e. the lag motion) and the helicopter fuselage motion. A reduced linear system reproducing GR instability is used. It is obtained using successively Coleman transformation and binormal transformation. The analysis of the steadystate responses of this model is performed when a NES is attached on the helicopter fuselage. The NES involves an essential cubic restoring force and a linear damping force. The analysis is achieved applying complexification-averaging method. The resulting slow-flow model is finally analyzed using multiple scale approach. Four steady-state responses corresponding to complete suppression, partial suppression through strongly modulated response, partial suppression through periodic response and no suppression of the GR are highlighted. An algorithm based on simple criterions is developed to predict these steady-state response regimes. Numerical simulations of the complete system confirm this analysis of the slow-flow dynamics. A parametric analysis of the influence of the NES damping coefficient and the rotor speed on the response regime is finally proposed.
helicopter ground resonance;passive control;nonlinear energy sink;relaxation oscillations;strongly modulated response;
 Cited by
Mode coupling instability mitigation in friction systems by means of nonlinear energy sinks: Numerical highlighting and local stability analysis, Journal of Vibration and Control, 2017, 107754631770710  crossref(new windwow)
Passive suppression of helicopter ground resonance using nonlinear energy sinks attached on the helicopter blades, Journal of Sound and Vibration, 2017, 392, 41  crossref(new windwow)
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