SEMG-based fighter pilot muscle fatigue analysis and operation performance research

Fatigue has a tremendously adverse impact on pilot performance.This study aims to explore the Biceps Brachii(BB),Rectus Femoris(RF),Flexor Carpi Radialis(FCR),and Tibialis Anterior(TA)activities of fighter pilots in the early and late combat stages,and the target hitting time.A total of 13 volunteers were recruited to conduct simulated combats inside a real fighter cockpit.The surface Electromyography(sEMG)was collected from all volunteers in the initial and final 20s of flight,and the target hitting time during three simulated combats was recorded.The root mean square(RMS)values of right BB and TA were significantly higher than the left side values(p<0.001),while insignificant differences were found in the RMS values between the bilateral RF and FCR.Compared to the early flight period,the median frequency(MF)values of BB and TA were significantly lower during the late flight period,and the RMS values were significantly higher(p<0.047).Contrastively,the RMS values of FCR and RF differed insignificantly during the late flight period.Regarding the target hitting time,a significant difference was noted between task 1 and rask3.Subjects exhibit varying levels of muscle fatigue for different muscle groups before and after the flight.The muscle fatigue levels are asymmetrical on the left and right sides.Muscle fatigue might reduce the pilots'operational ability.This study provides a reference for fighter pilot fatigue protection and treatment.

某型军用运输机机组氧气系统供氧防护性能的低压舱生理试验评价

目的评价某型军用运输机机组氧气系统供氧防护性能,为产品设计定型提供生理试验依据。方法4具假人和4名健康志愿者配戴个体防护装备,使用某型军用运输机机组氧气系统,先后在低压舱内完成4项试验,包括氧气系统供氧性能物理试验、氧气系统迅速减压物理试验、6 h巡航高度供氧生理试验和12.0 km高空迅速减压生理试验。测试面罩内的氧气浓度、呼吸阻力、安全余压、迅速减压峰值面罩压、作用时间和稳压值等物理参数;监测志愿者心电图和血氧饱和度等生理参数。结果假人肺通气量为20 L/min时,该型军用运输机机组氧气系统在12.0 km以下提供的供氧分压≥19.1 kPa,安全余压接通前系统呼气阻力≤441.3 Pa,吸气阻力≤490.3 Pa。假人肺容积为1.0 L时,系统的迅速减压峰值≤5.8 kPa。6 h巡航飞行时,氧气系统为志愿者提供的供氧氧分压均≥21.9 kPa。4名志愿者均完成12.0 km高空迅速减压生理试验,主客观反应良好。结论该型军用运输机机组氧气系统防护性能可以满足地面至12.0 km高度供氧防护要求。