Volume 27 Issue 3
Mar.  2012
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NIE Zi, CHEN Ming, XU Guan-feng. Dynamic response analysis of a small-scale coaxial helicopter to a rapid collective pitch increase[J]. Journal of Aerospace Power, 2012, 27(3): 521-527.
Citation: NIE Zi, CHEN Ming, XU Guan-feng. Dynamic response analysis of a small-scale coaxial helicopter to a rapid collective pitch increase[J]. Journal of Aerospace Power, 2012, 27(3): 521-527.

Dynamic response analysis of a small-scale coaxial helicopter to a rapid collective pitch increase

  • Received Date: 2011-08-05
  • Rev Recd Date: 2011-12-26
  • Publish Date: 2012-03-28
  • Based on the engineering reality,a calculation model of the rotor unsteady aerodynamics of the small-scale coaxial helicopter had been set up.An airfoil unsteady aerodynamic model was established by introducing a set of Leishman-Beddoes semi-empirical indicial response formula.The induced velocity of the aerodynamic interaction between upper and lower rotors of a coaxial helicopter was set up based on the rigid wake model,free wake model and the dynamic inflow model with interference factors.Considering the teetering rotor’s particular flapping dynamic formula,the Runge-Kutta method was used to obtain the numerical solution of the rigid blade flapping angle.According to the calculation and analysis,the thrust response to a rapid collective pitch increase in both the hovering and forward flight states were obtained,and the blade’s hinge moment of the upper and lower rotors were compared.

     

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