Subjective Estimates of G-load in Centrifuge-Based Simulation and Applications for G-cueing in Desdemona

Grácio, B.J. Correia; Wentink, M.; Groen, Eric L.; Bles, W.

doi:10.2514/6.2009-5919

Cited by 5 publications

(4 citation statements)

References 7 publications

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“…A central question is to what degree feedback or training procedures will affect the accuracy of the force field estimates in hypergravity. Gracio et al (2009) repeatedly exposed participants without any previous high G experience to two different G loads (1.6 G and 1.8 G) in a centrifuge. The participants rapidly improved their capacity to actively adjust the G load, which might suggest a rapid perceptual learning (Gracio et al, 2009).…”

Section: Discussionmentioning

confidence: 99%

“…Gracio et al (2009) repeatedly exposed participants without any previous high G experience to two different G loads (1.6 G and 1.8 G) in a centrifuge. The participants rapidly improved their capacity to actively adjust the G load, which might suggest a rapid perceptual learning (Gracio et al, 2009). Still, the present group of pilots, all well accustomed to high G loads, verbally overestimated the force levels, and their magnitudes of overestimation were consistent in the two experimental sessions, occurring with a 6-month interval.…”

Section: Perception Of G Loadmentioning

confidence: 99%

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Factors of significance for the ability of fighter pilots to visually indicate the magnitude of roll tilt during simulated turns in a centrifuge

Brink,

Keramidas,

Tribukait

et al. 2023

Perception

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During coordinated flight and centrifugation, pilots show interindividual variability in perceived roll tilt. The study explored how this variability is related to perceptual and cognitive functions. Twelve pilots underwent three 6-min centrifugations on two occasions (G levels: 1.1G, 1.8G, and 2.5G; gondola tilts: 25°, 56°, and 66°). The subjective visual horizontal (SVH) was measured with an adjustable luminous line and the pilots gave estimates of experienced G level. Afterward, they were interrogated regarding the relationship between G level and roll tilt and adjusted the line to numerically mentioned angles. Generally, the roll tilt during centrifugation was underestimated, and there was a large interindividual variability. Both knowledge on the relationship between G level and bank angle, and ability to adjust the line according to given angles contributed to the prediction of SVH in a multiple regression model. However, in most cases, SVH was substantial smaller than predictions based on specific abilities.

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Section: Discussionmentioning

confidence: 99%

Section: Perception Of G Loadmentioning

confidence: 99%

Factors of significance for the ability of fighter pilots to visually indicate the magnitude of roll tilt during simulated turns in a centrifuge

Brink,

Keramidas,

Tribukait

et al. 2023

Perception

View full text Add to dashboard Cite

show abstract

“…But if the pilot would not notice small deviations from this G-vector, in its magnitude and alignment, this allows harmful Coriolis effects to be mitigated. Gracio et al [59] studied the just noticeable difference (JND) in the perception of G-load magnitude and found that this JND is related to the G-load intensity. In the alignment of the centrifuge's G-vector, it is likely that small deviations from the true alignment angle, 𝜃 𝑡𝑟 𝑢𝑒 , will also not be perceived by pilots.…”

Section: A Coherence Zone Conceptmentioning

confidence: 99%

Mitigating Coriolis Effects in Centrifuge Simulators Through Allowing Small, Unperceived G-Vector Misalignments

Mkhoyan¹,

Wentink²,

Graaf³

et al. 2022

Preprint

Self Cite

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When coupled with additional degrees of freedom, centrifuge-based motion platforms can combine the agility of hexapod-based platforms with the ability to sustain higher G-levels and an extended motion space, required for simulating extreme maneuvers. However, the false and often nauseating sensations of rotation, by Coriolis effects induced by the centrifuge rotation in combination with rotations of the centrifuge cabin or the pilot's head, are a major disadvantage. This paper discusses the development of a motion filter, the Coherent Alignment Method (COHAM), which aims at reducing Coriolis effects by allowing small mismatches in the G-vector alignment, reducing cabin rotations. Simulations show that as long as these mismatches remain within a region where humans perceive the G-vector as 'coherent', the Coherent Alignment Zone (CAZ), the cabin angular accelerations can indeed be reduced. COHAM was tested in a high G-maneuver task with a fixed CAZ threshold obtained in a previous study. It was experimentally compared to an existing motion filter, using metrics such as sickness, comfort and false cues. Results show that sickness, dizziness and discomfort are reduced, making the centrifuge sessions more bearable. It is recommended to further improve the filter design and tuning, and test it with more fighter pilots.

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“…In the context of the SUPRA project we are performing motion perception studies in DESDEMONA to develop G-cueing solutions for the purpose of upset recovery simulation. For example, in a previous study we investigated how sensitive pilots are for deviations in the magnitude of the simulated G-load 7 . In the current study we investigated how accurate pilots without previous G-training perceive and reproduce G-loads in the DESDEMONA flight simulator.…”

Section: Introductionmentioning

confidence: 99%

Pilot Performance in Centrifuge-Based Simulation of Unusual Attitude Recovery

Ledegang¹,

Groen²,

Wentink

2012

Journal of Aircraft

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The aim of the collaborative European research project 'Simulation of UPset Recovery in Aviation' (SUPRA) is to develop breakthrough simulator technologies for teaching pilots to detect and recover from adverse flight upsets that could lead to unusual attitudes and lossof-control. In the project, the high-performance research simulator DESDEMONA is utilized, which integrates a flight simulator having a six-degrees-of-freedom motion platform with a sustained acceleration capability up to 3.0g. These characteristics result in improved simulation of motions encountered in upset conditions, compared to conventional fixed base or hexapod simulators. This paper describes a study consisting of two experiments to determine how accurate pilots can judge and reproduce a specific G-level in the DESDEMONA simulator, and respectively, how their control behavior depends on G-forces during unusual attitude recovery. In total seventeen civil pilots, without previous G-maneuvering experience, participated in the study. The results show that pilots without previous G-exposure tend to overestimate G-levels based on their seat-of-the-pants, resulting in performance below the target G-level. With minimum training, their performance instantly improved up to adequate level. However, a retest after six months showed that this improvement did not endure. With respect to aircraft control during recovery from a noselow unusual attitude, the pilots showed significantly better performance with G-cueing simulation, in terms of deviation from the target G-load, compared to fixed-base simulation in which they tend to 'over-G'. It can be concluded that G-cueing simulation results in improved upset recovery performance of civil pilots compared to Fixed-base simulation. Hence, simulation of upset recovery with G-cueing may result in more realistic and adequate recovery training.

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Subjective Estimates of G-load in Centrifuge-Based Simulation and Applications for G-cueing in Desdemona

Cited by 5 publications

References 7 publications

Factors of significance for the ability of fighter pilots to visually indicate the magnitude of roll tilt during simulated turns in a centrifuge

Factors of significance for the ability of fighter pilots to visually indicate the magnitude of roll tilt during simulated turns in a centrifuge

Mitigating Coriolis Effects in Centrifuge Simulators Through Allowing Small, Unperceived G-Vector Misalignments

Pilot Performance in Centrifuge-Based Simulation of Unusual Attitude Recovery

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