In order to improve the measurement accuracy of sensors and better evaluate the damage ability of weapons, this paper uses fractal theory to analyze the relationship between preload force and contact stiffness,calculates the contact stiffness between various components,and establishes a sensor dynamic model to obtain the relationship between various influencing factors and sensor dynamic characteristics.The model results show that increasing preload force, reducing the area of PVDF film,and reducing the thickness of PVDF film,electrode,and cover plate PET film can effectively improve the dynamic characteristics of sensors.Finally,the accuracy of the model is verified using ANSYS finite element analysis software and shock tube calibration experiments.Under given parameters,the natural frequency simulated by ANSYS is 71.069 kHz,and the shock wave is generated.The experimental result of tube calibration is 91.073 kHz,which is consistent with the theoretical model calculation result of 65.277 kHz,proving the feasibility of the model.