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Volume 41 Issue 7
Jul.  2015
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Journal of Beijing University of Aeronautics and Astronautics  > 2015  >  41(7): 1287-1293.
LU Yang, YU Liming, FU Yonglinget al. Performance comparison of four pre-filters used to prevent pitch categoryⅡPIO[J]. Journal of Beijing University of Aeronautics and Astronautics, 2015, 41(7): 1287-1293. doi: 10.13700/j.bh.1001-5965.2014.0507(in Chinese)
Citation: LU Yang, YU Liming, FU Yonglinget al. Performance comparison of four pre-filters used to prevent pitch categoryⅡPIO[J]. Journal of Beijing University of Aeronautics and Astronautics, 2015, 41(7): 1287-1293. doi: 10.13700/j.bh.1001-5965.2014.0507(in Chinese)
shu

Performance comparison of four pre-filters used to prevent pitch categoryⅡPIO

doi: 10.13700/j.bh.1001-5965.2014.0507
  • 1.

    School of Automation Science and Electrical Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

  • 2. School of Mechanical Engineering and Automation, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

  • Received Date: 11 Aug 2014
  • Rev Recd Date: 20 Nov 2014
  • Publish Date: 20 Jul 2015
    Abstract
  • Category Ⅱ PIO cases are mostly characterized by actuator saturation. FWB, DS, DASA, RLF are four nonlinear pre-filters that have already been used to compensate for the phase lag led by actuator saturation, thus to prevent pilot-induced oscillation (PIO). Different means were used to make comparison among four pre-filters. Dscribing function was used to analyze and compare the phase compensation in open loop analysis by linearizing the nonlinear components of the fourpre-filters. The study mainly focused on pitch attitude PIO, in a pilot-vehicle closed loop system with a neutrally stable pitch bare aircraft that could easily cause PIO, three typical pitch flight simulation tasks were used to make comparison in terms of actuator velocity saturation prevention, pitch output dynamic characters, degree of phase compensation and alleviation of pilot operation burden, measured by pilot input magnitude. DASA turns out to be a better design among the four pre-filters. The result can provide a useful reference for filter design and pitch attitude PIO prevention study.

     

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