Eventos Anais de eventos
DINAME 2023
XIX International Symposium on Dynamic Problems of Mechanics
Evaluation of Open Loop Onset Point Criterion to predict rate saturation PIO using flight simulator
Submission Author:
Juliano A. B. Gripp , SP
Co-Authors:
Juliano A. B. Gripp, Marco Aurélio Guimarães Moreira, Luis Gonzaga Trabasso, Cleverson Marinho
Presenter: Juliano A. B. Gripp
doi://10.26678/ABCM.DINAME2023.DIN2023-0109
Abstract
Actuator rate saturation has been a contributing factor for Pilot-Induced Oscillations (PIO) experienced on some aircraft incidents, indicating potential design problems of flight control laws. Some criteria to predict this kind of phenomenon during design has been proposed in last decades, such as the Open Loop Onset Point (OLOP) criterion. In order to explore the capacities of prediction and limitations of OLOP criterion applied to the design of representative flight control laws for a transport aircraft in full flight envelope, two methods of control laws to regulate roll rate and sideslip (“p-beta”) were evaluated, with different approaches for control allocation. OLOP criterion was applied in both methods with maneuvers varying pilot gain, frequency, and amplitude. These combinations were compared with pilot-in-the-loop simulations, using a flight simulator assisted by a robotic motion platform. It is possible to check that higher PIO ratings (worst cases) given by pilots are associated to cases with longer periods of rate-saturated actuator. However, OLOP criterion does not distinguish the duration of rate saturation, only its occurrence. Further recommendations to improve the process of clearance of control laws in the context of PIO due to rate limiting are proposed, adopting OLOP criterion as a first step.
Keywords
nonlinear dynamics, rate saturation, open loop onset point, fly-by-wire aircraft, robotic flight simulator
