Daniel Drewiacki, Flavio J. Silvestre, Antonio Bernardo Guimaraes Neto

DOI number: N/A

Conference number: IFASD-2019-061

Biodynamic feedthrough is a phenomenon in which structural vibrations on the cockpit are fedback to the pilot, who transmits those vibrations on the aircraft through involuntary inceptor displacements. In the case these commands lead to instabilities, the phenomenon is then called Pilot-Assisted (or Augmented) Oscillations (PAO). This is a complex phenomenon that depends on three basic elements. First element is the aeroelastic modes of the aircraft, especially their modal shapes (since only specific modal shapes interfere in this phenomenon) and frequencies. Second one is the inceptor’s system characteristics, such as natural frequency and damping. The last element is the human pilot dynamics, which may be modelled as a passive spring-mass-damper system. This paper aims to explore how these three elements affect the development of the PAO phenomenon for more flexible aircraft. The investigations herein are accomplished for a virtual, flexible aircraft by the analysis of pilot-in-the-loop simulations of a high gain maneuver, varying airframe elasticity levels, inceptor system parameters and pilot model characteristics.

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In Categories: Aeroservoelasticity, IFASD 2019
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