TY - JOUR

T1 - Hidden Oscillations In The Closed-Loop Aircraft-Pilot System And Their Prevention

AU - Andrievsky, Boris

AU - Kravchuk, Kirill

AU - Kuznetsov, Nikolay V.

AU - Kuznetsova, Olga A.

AU - Leonov, Gennady A.

PY - 2016/1/1

Y1 - 2016/1/1

N2 - The paper is devoted to studying and prevention of a special kind of oscillations-the Pilot Involved Oscillations (PIOs) which may appear in man-machine closed-loop dynamical systems. The PIO of categories II and III are defined as essentially non-linear unintended steady fluctuations of the piloted aircraft, generated due to pilot efforts to control the aircraft with a high precision. The main non-linear factor leading to the PIO is, generally, rate limitations of the aircraft control surfaces, resulting in a delay in the response of the aircraft to pilot commands. In many cases, these oscillations indicate presence of hidden, rather than self-excited attractors in the aircraft-pilot state space model. Detection of such a kind of attractors is a difficult problem since basin of attraction is not connected with unstable equilibrium. In the paper existence of the hidden attractor in pitch motion of the piloted aircraft is demonstrated and the nonlinear phase shift compensator is designed. The results obtained demonstrate that the proposed method in several times increases the admissible gain of the “airplane-pilot” loop as compared with non-corrected system.

AB - The paper is devoted to studying and prevention of a special kind of oscillations-the Pilot Involved Oscillations (PIOs) which may appear in man-machine closed-loop dynamical systems. The PIO of categories II and III are defined as essentially non-linear unintended steady fluctuations of the piloted aircraft, generated due to pilot efforts to control the aircraft with a high precision. The main non-linear factor leading to the PIO is, generally, rate limitations of the aircraft control surfaces, resulting in a delay in the response of the aircraft to pilot commands. In many cases, these oscillations indicate presence of hidden, rather than self-excited attractors in the aircraft-pilot state space model. Detection of such a kind of attractors is a difficult problem since basin of attraction is not connected with unstable equilibrium. In the paper existence of the hidden attractor in pitch motion of the piloted aircraft is demonstrated and the nonlinear phase shift compensator is designed. The results obtained demonstrate that the proposed method in several times increases the admissible gain of the “airplane-pilot” loop as compared with non-corrected system.

KW - compensator

KW - hidden attractor

KW - nonlinear

KW - phase shift

KW - pilot-aircraft model

KW - pilot-involved oscillations

KW - rate limitations

UR - http://www.scopus.com/inward/record.url?scp=84990032595&partnerID=8YFLogxK

U2 - 10.1016/j.ifacol.2016.07.970

DO - 10.1016/j.ifacol.2016.07.970

M3 - Article

AN - SCOPUS:84990032595

VL - 49

SP - 30

EP - 35

JO - IFAC-PapersOnLine

JF - IFAC-PapersOnLine

SN - 2405-8971

IS - 14

ER -