Development of the Phase-Aggression Criterion for Rotorcraft—Pilot Coupling Detection

The involuntary interaction of a pilot with an aircraft can be described as pilot-assisted oscillations. Such phenomena are usually only addressed late in the design process when they manifest themselves during ground/flight testing. Methods to be able to predict such phenomena as early as possible are therefore useful. This work describes a technique to predict the adverse aeroservoelastic rotorcraft-pilot couplings, specifically between a rotorcraft's roll motion and the resultant involuntary pilot lateral cyclic motion. By coupling linear vehicle aeroservoelastic models and experimentally identified pilot biodynamic models, pilot-assisted oscillations and no-pilot-assisted oscillation conditions have been numerically predicted for a soft-in-plane hingeless helicopter with a lightly damped regressive lead-lag mode that strongly interacts with the roll mode at a frequency within the biodynamic band of the pilots. These predictions have then been verified using real-time flight-simulation experiments. The absence of any similar adverse couplings experienced while using only rigid-body models in the flight simulator verified that the observed phenomena were indeed aeroelastic in nature. The excellent agreement between the numerical predictions and the observed experimental results indicates that the techniques developed in this paper can be used to highlight the proneness of new or existing designs to pilot-assisted oscillations.

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“…according to the PIOR scale [40]. These considerations substantiate the notion that PIOs can be caused by high workload.…”

Section: Influence Of Pilot/lateral Stick Control Feedback In Forwsupporting

confidence: 59%

Prediction and Simulator Verification of Roll/Lateral Adverse Aeroservoelastic Rotorcraft–Pilot Couplings

Muscarello¹,

Quaranta²,

Masarati³

et al. 2016

Journal of Guidance, Control, and Dynamics

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“…Fig. 3 shows the research simulators used in the European project ARISTOTEL -Aircraft and Rotorcraft Pilot Couplings-Tools and Techniques for Alleviation and Detection-(2010-2013) [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33]. The results from this project form the bulk of the remainder of this 1 The full flight simulators (FFS) can be divided in four levels of fidelity: (1) Level A -A motion system is required with at least three degrees of freedom.…”

Section: Flight Simulators: Ideal Devices For Training and Researchmentioning

confidence: 99%

“…The ARISTOTEL project -Aircraft and Rotorcraft Pilot Couplings -Tools and Techniques for Alleviation and Detection (2010)(2011)(2012)(2013) in Europe performed a series of simulator test campaigns to understand and advance the state-of-the-art in the prediction of A/ RPC phenomena using flight simulators (in relation to both biodynamic and active pilot in the loop testing) [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33]. The goal of the present paper is to review the findings of the ARISTOTEL project, specifically in relation to ground-based simulator testing to unmask A/RPCs.…”

Section: And Pilot Assistedmentioning

confidence: 99%

Practises to identify and prevent adverse aircraft-and-rotorcraft-pilot couplings—A ground simulator perspective

Pavel

Jump

Masarati

et al. 2015

Progress in Aerospace Sciences

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“…This task will be discussed in the next paragraph. The results from the simulator test campaigns have been reported in [21,26]. The Precision Hover (PH) manoeuvre contained within ADS-33 is a multi-axis re-position stabilization task to assess low-speed performance.…”

Section: Selection Of Flight Tasks For Exposing Rpc In the Simulatormentioning

confidence: 99%

“…The new "Real-time Phase Aggression Criterion" (PAC) method [21,30,33] is based upon ROVER and the Pilot-Inceptor Workload (PIW) method proposed by Gray [91,92]. PIW was developed to identify A/RPC susceptibility in Boundary Avoidance Tracking (BAT) tasks, i.e.…”

Section: Selection Of Flight Tasks For Exposing Rpc In the Simulatormentioning

confidence: 99%

Practices to identify and preclude adverse Aircraft-and-Rotorcraft-Pilot Couplings – A design perspective

Pavel

Masarati

Gennaretti

et al. 2015

Progress in Aerospace Sciences

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Abstract:The aviation community relies heavily on flight simulators as a fundamental tool for research, pilot training and development of any new aircraft design. The goal of the present 1 Corresponding author Tel. +31 15-2785374, E-mail Address m.d.pavel@tudelft.nl 2 paper is to provide a review on how effective ground simulation is as an assessment tool for unmasking adverse Aircraft-and-Rotorcraft Pilot Couplings (APC/RPC). Although it is generally believed that simulators are not reliable in revealing the existence of A/RPC tendencies, the paper demonstrates that a proper selection of high-gain tasks combined with appropriate motion and visual cueing can reveal negative features of a particular aircraft that may lead to A/RPC. The paper discusses new methods for real-time A/RPC detection that can be used as a tool for unmasking adverse A/RPC. Although flight simulators will not achieve the level of reality of in-flight testing, exposing A/RPC tendencies in the simulator may be the only convenient safe place to evaluate the wide range of conditions that could produce hazardous A/RPC events.

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Development of the Phase-Aggression Criterion for Rotorcraft—Pilot Coupling Detection

Cited by 14 publications

References 2 publications

Prediction and Simulator Verification of Roll/Lateral Adverse Aeroservoelastic Rotorcraft–Pilot Couplings

Prediction and Simulator Verification of Roll/Lateral Adverse Aeroservoelastic Rotorcraft–Pilot Couplings

Practises to identify and prevent adverse aircraft-and-rotorcraft-pilot couplings—A ground simulator perspective

Practices to identify and preclude adverse Aircraft-and-Rotorcraft-Pilot Couplings – A design perspective

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