摘要目的 观察一套安装在载人离心机上的蹬力测量系统使用效果. 方法 蹬力测量系统包括蹬力的传导及信号处理两个部分.蹬力传导部分包括左、右两套带气囊的踏板和1个充气组件.蹬力信号处理部分由5502型压力传感器、5B系列隔离信号调理模块、DaqBoard/2005TMA/D板及DASYLab 5.6 软件等组成.将该系统安装在AMST-HC-4E型载人离心机上,进行了以9名歼击机飞行员为受试者的3组+Gz暴露试验. 结果 不同载荷时的气囊内压力差异显著(F=11.63,P=0.000).气囊内压力与载荷呈正相关,其线性回归方程为:气囊内压力P=4.5×载荷+4.2(r=0.915,P<0.01).根据气囊内压力曲线形态,可判断飞行员在作抗荷动作时的下肢用力方式. 结论 该测量系统能够实时监测加速度作用时受试者的蹬力变化.在加速度耐力检查及离心机训练时可利用该系统监测受试者的下肢用力情况.

abstractsObjective To evaluate the system for continuously measuring forces exerted on pedals on human centrifuge. Methods The measurement system consisted of force transmitting and signal processing units. The force transmitting unit included two pedals with air bladders and an inflating assembly. The signal processing unit was composed of Model 5502 pressure transducer, 5B series isolated signal regulation modules, DaqBoard/2005TM AID board and DASYLab 5. 6 data acquisition and analysis software. The system was evaluated on AMST-HC-4E human centrifuge by nine pilots. Results There was significant difference in the air bladder pressure (ACP) that reflected the force exerted on pedals between different +Gz levels and the ACP was also significantly correlated to + Gz (r=0.915, P< 0. 01), The relation between ACP and +Gz value could be concluded by a linear regression equation: ACP= 4.5 × Gz +4.2. The measured pressure patterns in bladder could be useful for judging how subject distribute his leg strength in performing anti-G maneuver (AGSM). Conclusions The system can measure subject's leg strength during his +Gz exposure. It could be useful in pilot' s + Gz tolerance evaluation and centrifuge training.