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Volume 42 Issue 7
Jul.  2016
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Journal of Beijing University of Aeronautics and Astronautics  > 2016  >  42(7): 1550-1556.
ZHU Xiaoyu, CAO Yihua, CAO Longet al. Heavy helicopter-slung-load coupling system flying qualities in closed-loop state[J]. Journal of Beijing University of Aeronautics and Astronautics, 2016, 42(7): 1550-1556. doi: 10.13700/j.bh.1001-5965.2015.0442(in Chinese)
Citation: ZHU Xiaoyu, CAO Yihua, CAO Longet al. Heavy helicopter-slung-load coupling system flying qualities in closed-loop state[J]. Journal of Beijing University of Aeronautics and Astronautics, 2016, 42(7): 1550-1556. doi: 10.13700/j.bh.1001-5965.2015.0442(in Chinese)
shu

Heavy helicopter-slung-load coupling system flying qualities in closed-loop state

doi: 10.13700/j.bh.1001-5965.2015.0442

  • School of Aeronautic Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

  • Received Date: 01 Jul 2015
  • Publish Date: 20 Jul 2016
    Abstract
  • Flying qualities of a heavy helicopter augmented with an automatic flight control system (AFCS) and flying with externally slung loads are investigated using the mathematical model of the CH-53A/D helicopter. A nonlinear dynamical model of helicopter-slung-load in closed-loop state was built based on single mass-point hypothesis and a control system model. Under this hypothesis, extra degrees of freedom and constraints were brought in by the consideration of the slung-load, which made the set of equations of motion increased to a 13-order one. The coupling system in closed-loop state was linearized under small-perturbed conditions. After this, the slung-load flight control response characteristics in both time and frequency domain were analyzed. The effect of slung-load mass, slung-load rope length and helicopter velocity on coupling system's flight quality was analyzed according to the handling qualities requirements for military rotorcraft indicated by ADS-33E. The final results show that the slung-load mass, slung-load rope length and helicopter velocity have varying degrees of impact on the time domain features and handling qualities of the coupling system.

     

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