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  • Open Daily: 10am - 10pm
    Alley-side Pickup: 10am - 7pm

    3038 Hennepin Ave Minneapolis, MN
    612-822-4611

Open Daily: 10am - 10pm | Alley-side Pickup: 10am - 7pm
3038 Hennepin Ave Minneapolis, MN
612-822-4611
A Nonlinear Pre-Filter to Prevent Departure And/or Pilot-Induced Oscillations Due to Actuator Rate Limiting

A Nonlinear Pre-Filter to Prevent Departure And/or Pilot-Induced Oscillations Due to Actuator Rate Limiting

Chapa, Michael J.

Paperback

Technology & EngineeringAviation Instruction

ISBN10: 1025097262
ISBN13: 9781025097268
Publisher: Hutson Street Press
Published: May 22 2025
Pages: 170
Weight: 0.54
Height: 0.36 Width: 6.14 Depth: 9.21
Language: English

Closed loop instability caused by excess phase lag induced by actuator rate limiting has been suspected in many aircraft departures from controlled flight and pilot-induced oscillations (PIO). As part of the joint Air Force Institute of Technology/Test Pilot School (AFIT/TPS) program, a nonlinear rate limiter pre-filter (RLPF) was developed to minimize the phase lag induced by rate limiting. RLPF performance was evaluated inside the feedback path, but primary emphasis was on the pilot command path. Closed loop computer and motion-based flight simulations were conducted to prepare for the flight test. The HAVE FILTER flight test project was flown using the NF-16D Variable Stability In-flight Simulator Test Aircraft (VISTA) aircraft and evaluated using a software rate limit (SWRL) with and without an RLPF on the pilot command path. A programmable heads-up-display (HUD) was used to generate a fighter tracking task. Flight test results showed the SWRL was useful in preventing departure and/or PIO.

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