The use of the Open-Loop Onset Point (OLOP) to predict rotorcraft pilot-induced oscillations

Jones, Michael

doi:10.1007/s13272-020-00448-9

Cited by 4 publications

(3 citation statements)

References 20 publications

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“…The evaluation of human-vehicle quality for Type II PIO mainly adopts the OLOP criterion [19][20] . This criterion defines the frequency at which the first occurrence of control surface rate limitation i n the human-vehicle closed-loop system as the closed-loop onset frequency ω and the open-loop f requency response at the closed-loop onset frequency is called the Open-Loop Onset Point (OLOP).…”

Section: Open-loop Onset-point (Olop) Criterionmentioning

confidence: 99%

Parameters design for feel system of aircraft active inceptor controller

Wei,

Liu,

Cui

et al. 2024

J. Phys.: Conf. Ser.

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To provide the pilot with feedback on flight states, aircraft active inceptor controllers deliver appropriate tactile feedback through the feel system. Current research on the feel system often relies on conventional models, with limited analysis of its unique characteristics. Investigating the dynamic properties of the feel system and their impact on flying quality can inform the parameters design of the feel system. In this paper, we designed various feel system parameters with different natural frequencies and damping ratios and selected three typical aircraft dynamic models. A human-vehicle closed-loop system model is established, including the pilot model, feel system model, and aircraft dynamic model. Combining different flying quality criteria, including bandwidth criterion, Neal-Smith criterion, and Open-Loop Onset-Point (OLOP) criterion, the flying qualities of Type I and Type II pilot-induced oscillations (PIO) are evaluated separately. The influence of aircraft configuration, feel system natural frequency and damping ratio on flying quality is explored. Finally, design recommendations for the feel system are proposed, aiming to reduce the adverse aircraft pilot coupling and improve flying quality.

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Section: Open-loop Onset-point (Olop) Criterionmentioning

confidence: 99%

Parameters design for feel system of aircraft active inceptor controller

Wei,

Liu,

Cui

et al. 2024

J. Phys.: Conf. Ser.

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“…The pilot inducted oscillations (PIOs) in modern flight control systems have deep roots in actuators' saturation (Bucolo et al, 2020). These oscillations are classified in type II of PIO, which is a quasi-linear oscillation with some nonlinear factors of the pilot-aircraft system (Jones, 2020).…”

Section: Introductionmentioning

confidence: 99%

Generalized predictive control of the aircraft system with actuator saturation to prevent Pilot-induced Oscillations

Rezaei

Khosravi

2022

JER is an international, peer-reviewed journal that publishes f

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Amplitude and rate saturations are one of the problems of flight control systems which puts the closed-loop system stability at risk. These nonlinear elements are mainly responsible for the type II pilot induces oscillations (PIOs). In this paper, a robust unconstrained generalized predictive controller (GPC) with a self-tuning regulator (STR) structure is designed in the frequency domain to prevent the type II PIOs. Furthermore, the sensitivity function is used for tuning the GPC parameters and investigating the stability and robustness of the system against the uncertainties of the controller parameters. To get better results, a constrained GPC is further designed considering the rate, amplitude, and both saturations. Rate and amplitude saturations are considered as input constraints in the design stage. Finally, the performances of the proposed controllers are compared to that of a PID controller.

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“…Examples of research efforts in the field regarding RPCs include high fidelity modelling of aeroelastic couplings ( [9,10]), identification of pilot biodynamics and models ( [11][12][13]), development of prediction and detection tools ( [14,15]) and development of design guidelines ( [16,17]). The research effort described in this paper concerns procedures and methods to ensure that PIO tendencies are exposed during test and evaluation efforts and not during operations.…”

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confidence: 99%

In-Flight Test Campaign to Validate PIO Detection and Assessment Tools

et al. 2020

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This paper describes a joint research campaign conducted by the German Aerospace Center (DLR) and the National Research Council Canada (NRC) to explore methods and techniques to expose rotorcraft pilot-induced oscillations (PIOs) during flight testing. A flight test campaign was conducted at NRC using the Bell 205 experimental aircraft. Results show that, particularly for the lateral axis, ADS-33 tasks can be successfully applied to expose PIO tendencies. Novel subjective and objective criteria were used during the test campaign. PIO prediction boundaries of the objective phase-aggression criteria (PAC) detection algorithm were validated through results obtained. This was the first use of PAC with data recorded in-flight. To collect subjective feedback, the aircraft–pilot coupling (APC) scale was used. This was the first use of the novel scale in-flight and received favourable feedback from the evaluation pilot. Modifications to ADS-33 mission tasks were found to successfully improve the ability to consistently expose PIOs.

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The use of the Open-Loop Onset Point (OLOP) to predict rotorcraft pilot-induced oscillations

Cited by 4 publications

References 20 publications

Parameters design for feel system of aircraft active inceptor controller

Parameters design for feel system of aircraft active inceptor controller

Generalized predictive control of the aircraft system with actuator saturation to prevent Pilot-induced Oscillations

In-Flight Test Campaign to Validate PIO Detection and Assessment Tools

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