Research On Key Technology Of Shock Wave Overpressure Storage Test

The measurement of shock wave overpressure is not only the important content of explosive dynamics and impact dynamics, but also the basic approach of determining its lethality in the technology of weapon warhead. The storage test device of shock wave overpressure and its performance in harsh environment is currently a research hotspot. The paper carried out a design of the test and storage device of shock wave overpressure and the research of disturbance attenuation approach in explosive environment.The action time, overpressure amplitude, rise time and propagation characteristics in the ground of shock wave have been analyzed in the paper. Besides, the performance parameters of storage test device, like maximum recording time, range, bandwidth,and maximum sampling frequency, have been determined.The effect of length of a low-noise coaxial cable on shock wave overpressure testing has been researched. The output characteristics under thermal shock and response characteristics after vibration of two piezoelectric pressure sensors have been analyzed by experimental comparison. It can be obtained that the output of high resistance charge is than ICP sensor in disturbance attenuation on environmental factors. The effects of installation method and connection stiffness of the sensor on testing have been analyzed.The sensor 603B is chosen as the sensor used to test shock wave overpressure. N-channel MOS-type FET is used to design pre-voltage amplification circuit which realize impedance transformation. OP270 is used to design adopting amplifying and filtering circuit which realize amplification conversion and low-pass filter. The main control module based on EP2C5Q208C8N, the A/D acquisition module based on AD9223, the storage module based on HY57V641620FTP-7 and the USB data transmission interface based on FT245RL are designed. The program of PLL timer, A/D conversion, cache, trigger storage and data transmission is designed based on Verilog language. The program of host computer is designed based on labview which realized the read-back, processing and displaying of shock wave overpressure signal. The structure of the storage test device is designed. The size of top plate is simulated and it is determined that the size is 30cm.The performance of the storage test device is tested and analyzed by applying standard incentive source on each module. The device is carried out shock vibration experiment through hammering method. The effect of shock vibration is inhibited by imposing cushion on the connection. The experiment shows that this storage test device can acquire complete waveform data through trigger.