Du Cheng-Fei, Liu Xiao-Yu, Wang Li-Zhen, Liu Song-Yang, Fan Yu-Bo
Aerosp Med Hum Perform. 2015 May;86(5):466-71. doi: 10.3357/AMHP.4126.2015.
Modern super agile fighter aircraft are capable of producing an increasing multiaxial acceleration environment which can adversely affect the pilot. An evaluation of the performance of the restraint system during flight maneuvers will benefit restraint designs and, thus, the safety of pilots.
A finite element model of a mannequin with PCU-15/P harness restraint was used in this study to investigate how the factors, such as strap material stiffness, friction, and belt tension, affect the performance of restraint systems during impact along the -Gx, -Gy, and -Gz directions. The corresponding maximum displacement of the mannequin's torso was computed.
The mannequin moved beyond 74 mm sideways. The change in friction coefficient (FC) from 0.1 to 0.4 decreased the displacement of the lower torso by less than 6.7%. The displacement of the torso decreased as the stiffness of the strap or tension increased. Displacement decreased by 9.3%, 6.0%, and 2.7% for the lower torso under the Gx impact, as the tightening force increased from 20 N to 80 N gradually. However, this changed slightly when the stiffness arrived at 1 E or the tension increased to 60 N.
PCU-15/P harness has the poorest performance during side impact and friction plays an unimportant role in affecting its performance. The stiffness of the webbing used in the PCU-15/P harness is sufficiently high. The lap belt has more effect on limiting the movement of the pilot than the shoulder straps, and a tension of 60 N during the adjustment may be enough for conventional flight maneuvers.
现代超级敏捷战斗机能够产生不断增加的多轴加速度环境，这可能会对飞行员产生不利影响。评估飞行机动过程中约束系统的性能将有利于约束设计，从而提高飞行员的安全性。
本研究使用带有PCU-15/P安全带约束装置的人体模型有限元模型，来研究诸如安全带材料刚度、摩擦力和安全带张力等因素如何在沿-Gx、-Gy和-Gz方向的撞击过程中影响约束系统的性能。计算了人体模型躯干相应的最大位移。
人体模型向侧面移动超过74毫米。摩擦系数（FC）从0.1变为0.4时，下躯干的位移减少不到6.7%。随着安全带刚度或张力的增加，躯干的位移减小。在Gx方向撞击下，当下躯干的收紧力从20牛逐渐增加到80牛时，位移分别减少了9.3%、6.0%和2.7%。然而，当刚度达到1E或张力增加到60牛时，这种情况变化不大。
PCU-15/P安全带在侧面撞击时性能最差，摩擦力在影响其性能方面作用不大。PCU-15/P安全带中使用的织带刚度足够高。腰部安全带对限制飞行员的移动比肩部安全带更有效，调整过程中60牛的张力可能足以应对常规飞行机动。
