【摘要】 基于能量方法评价隔震系统的隔震效率,建立了人体与隔震结构的二自由度隔震系统力学模型,通过分析隔震系统在爆炸冲击震动输入下的能量响应,参考传统的加速度传递率评价方法,提出了从人体承受冲击能量大小的角度评价爆炸冲击隔震系统隔震效率的方法,即能量传递率法。通过输入不同峰值和脉冲宽度的半正弦加速度脉冲信号,数值模拟了二自由度隔震系统在不同爆炸冲击震动输入工况下的能量响应,以及隔震系统的加速度传递率和能量传递率。通过对计算结果的分析,研究了隔震系统的输入与输出之间的关系,以及输入能量对隔震效率的影响规律。研究结果表明:与传统的加速度传递率相比,能量分析方法能够较好地反映爆炸冲击隔震系统的隔离效果。更多还原

【Abstract】 In order to evaluate the isolation efficiency of shock isolation system using energy method,two degrees of freedom mechanical model of shock isolation system consisting of human body and protective structure was introduced.The energy responses of the model due to the excitation of explosion and shock wave were solved.A new evaluation method of shock isolation efficiency was proposed based on the energy transferred to body,which was named the energy transfer ratio.By inputting the half-sine impulse acceleration composed of different peak values and duration time,the energy responses,acceleration transfer ratio and energy transfer ratio of the two degrees of freedom shock isolation system were simulated.According to the results of many numerical examples,the relationship of input and output was studied.The influence rules of the input total energy on the isolation efficiency were obtained.Numerical results illustrate that energy analysis method can reflect the inherent characteristic of the shock isolation system.更多还原