Energy transfer ratio evaluation method of explosion and shock isolation efficiency.

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. [ABSTRACT FROM AUTHOR]