Volume 31 Issue 9
Sep.  2016
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WANG Xiao-long, XUN Hao-jun, XUE Yuan, ZHU He-quan, PEI Bin-bin. Envelope protection method for pitch attitude holding mode under flight icing conditions[J]. Journal of Aerospace Power, 2016, 31(9): 2087-2094. doi: 10.13224/j.cnki.jasp.2016.09.006
Citation: WANG Xiao-long, XUN Hao-jun, XUE Yuan, ZHU He-quan, PEI Bin-bin. Envelope protection method for pitch attitude holding mode under flight icing conditions[J]. Journal of Aerospace Power, 2016, 31(9): 2087-2094. doi: 10.13224/j.cnki.jasp.2016.09.006

Envelope protection method for pitch attitude holding mode under flight icing conditions

doi: 10.13224/j.cnki.jasp.2016.09.006
  • Received Date: 2015-01-02
  • Publish Date: 2016-09-28
  • An envelope protection method with autopilot systems was proposed based on the research of wing stall and tailplane stall under icing conditions. The angle of attack was identified as a critical parameter, and the pitch angle was identified as a command parameter. The detection of hinge moment coefficient could early warn aircraft stall and increase the margin of envelope protection. The flight longitudinal dynamics equation in pitch attitude holding (PAH) mode was built. Results show that, the envelope protection system works at the 2 degrees before the stall angle of attack through the detection of hinge moment under icing conditions, increasing the flight safety margin. With the control command limitation, the angle of attack of the automatic flight under icing conditions could be limited to the stall angle of attack.

     

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