抗冲地砖对立姿舰员的冲击防护效能分析

Performance of an Elastic Polymer Foam Cushion in Attenuating Responses of Shipboard Standing-men to Vertical Ship Shock

利用八自由度集总参数模型描述立姿舰员的生物动力学响应并预测其受损趋势,应用非线性质量-弹簧及阻尼模型模拟多孔结构的微惯性、刚度及粘性效应。定义最大抛离速度比及最大甲板反力比评价抗冲地砖的防护效果,讨论了抗冲地砖的无量纲临界屈曲力水平、粘性效应对其人员防护效果的影响,给出了人员抗冲用抗冲地砖应遵循的一般设计原则。

Protection of shipboard personnel from shock events induced by underwater explosion is very interesting to ship de-signers.In this study,the potential attenuation performance of an elastic polymer foam cushion inserted between standing-man and ship deck is investigated theoretically.An 8-DOF nonlinear lumped-parameter model is used to predict the standing-man＇s biodynam-ic responses and injury potential.The cushion is modeled by a chain of masses separated by nonlinear springs and dampers in parallel to simulate the micro inertia,stiffness and rate-dependent effects exhibited by common polymer cellular materials.Two variables,kickoff speed（KS）ratio and deck reaction force（DRF）ratio corresponding to two types of typical injury potential of standing-men,are defined as evaluation parameters.The influence of critical buckling force level,material rate dependent effect as well as other de-sign factors on the attenuation performance of the foam cushion is discussed in detail.Some general design rules are also presented.