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The effects of positive vertical acceleration on mental effort and performance during simulated aerobatics manoeuvres in a centerfuge
Published in Don Harris, Engineering Psychology and Cognitive Ergonomics, 2020
The latest generation of combat aircraft are technically capable of maintaining positive accelerations in the order of 12-14 G for periods up to 60 seconds or longer! These levels of acceleration are not easily tolerated, making human tolerance a limiting factor in aircraft performance and safety. Moreover, over the past two decades, it has become clear that a number of fatal fighter jet accidents could attributed to ‘+Gz - loss of consciousness’ (G-LOC) (Burton and Whinnery, 1988).
Acceleration
Published in David G. Newman, Flying Fast Jets, 2014
G-LOC has been formally defined as ‘a state of altered perception wherein (one’s) awareness of reality is absent as a result of sudden, critical reduction of cerebral blood circulation caused by increased G force’ (Burton, 1988b). G-LOC can be regarded as the most dire consequence of exposure to accelerations greater than +1 Gz.
Effective Monitoring for Early Detection of Hypoxia in Fighter Pilots
Published in The International Journal of Aerospace Psychology, 2023
Kosuke Kumagai, Satoshi Maruyama, Takahiro Imamura, Tetsuya Iwamoto, Yoshiki Kanamaru, Masaki Mine, Kunio Takada, Kojiro Wada
Measuring ΔO2Hb using NIRS had some following advantages for fighter pilots. First, acute hypoxia is known to cause decreases in O2Hb level earlier than SpO2 as this study demonstrated (Papadelis et al., 2007). The decrease in ΔO2Hb occurred approximately 20 seconds earlier than the decrease in %[SpO2] in this study. Second, NIRS can be used simply by sticking it on the forehead, and it does not interfere with fighter maneuvers. Third, gravity-induced loss of consciousness (G-LOC) is another major threat to fighter pilots and may result in fatal accidents. High +G force induces sudden reduction in cerebral blood flow and brain tissue O2 saturation (rapid hypoxia) and results in G-LOC. Measuring ΔO2Hb using NIRS associated with G-LOC is known to be useful (Kobayashi et al., 2012). NIRS had the potential to help to detect early signs for hypoxia or G-LOC.
Technical textiles for military applications
Published in The Journal of The Textile Institute, 2020
R. G Revaiah, T. M. Kotresh, Balasubramanian Kandasubramanian
Humans exist in gravity dependent environment. Therefore, gravity and the acceleration are most important things to be considered in military aviation. Anti-G-suit is an anti-gravity protection garment worn by the pilots of fighter aircrafts where positive G manoeuvring can lead to fatal conditions such as G-LOC (G induced loss of consciousness). G-suit is an inflatable fabric bladder placed at the abdomen, on sides of the calf areas and front of each thigh. The G-suit has a cut-design to allow the mobility of the pilot. There is an air hose connector that allows defined volume of air from pneumatic source of the aircraft to pressurise body parts in order to discourage pool of blood collecting at feet area. The inflation of the G-suit is effected by an anti-G valve, which senses G forces and allows the measured compression of the suit. The outer garment of the Anti-G suit is generally made of inherently flame retardant fabrics.