Volume 31 Issue 11
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CHEN Yuan, CHEN Ren-liang, LI Pan. Couplings in helicopter hovering longitudinal motional modes[J]. Journal of Aerospace Power, 2016, 31(11): 2701-2709. doi: 10.13224/j.cnki.jasp.2016.11.018
Citation: CHEN Yuan, CHEN Ren-liang, LI Pan. Couplings in helicopter hovering longitudinal motional modes[J]. Journal of Aerospace Power, 2016, 31(11): 2701-2709. doi: 10.13224/j.cnki.jasp.2016.11.018
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Couplings in helicopter hovering longitudinal motional modes

doi: 10.13224/j.cnki.jasp.2016.11.018

  • National Key Laboratory of Rotorcraft Aeromechanics, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China

  • Received Date: 2015-02-03
  • Publish Date: 2016-11-28
    Abstract
  • A quantitative analysis method was put forward, concentrating on couplings among state variables in helicopter motional modes. In the method, based on motional modes resulting from a decoupling procedure, couplings among state variables in motional modes were quantitatively described in combination with the matrix of aerodynamic derivatives. And all couplings were distinguished quantitatively by instantaneous characteristics and integrated characteristics. With the application into helicopters, Lynx, Bo105, and Puma, coupling characteristics of hovering longitudinal motional modes were analyzed. It showed that the coupling on pitching rate from longitudinal velocity by speed stability played a vital role in the unsteady hovering longitudinal oscillatory mode. Based on the quantitative analysis of examples, simplified models were obtained with the selection of main couplings, and the resulted deviation of natural frequency and damping ratio of motional modes was less than 2%, superior to simplified models in references. So it is feasible to obtain simplified models on the basis of the quantitative analysis.

     

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