Design Of Intelligent Storage Measurement System For Dynamic Blast Wave Overpressure

In military measurement,weapon charges are often in motion when they explode,so the actual explosion measurement of dynamic explosive shock waves is of great significance for weapon damage assessment.At present,the research method of dynamic explosion shock wave is mainly through the combination of simulation and dynamic explosion measurement: the position of the explosion center is predicted through simulation,and then the dynamic explosion shock wave is measured according to the static explosion measurement method.However,since the position of the explosion center cannot be accurately predicted,there are some deficiencies in the conventional storage measurement system in the dynamic explosion shock wave measurement,such as: 1)the charge is in motion,which makes the conventional synchronization method difficult to apply;2)the position of the explosion center is uncertain which confirmed that the predicted pressure is very different from the actual explosion,resulting in the measurement node not triggering or clipping;3)The wireless transmission distance is limited,and it is difficult to achieve full coverage of the explosion field;4)The dynamic explosion measurement is usually a multi-shot measurement,and the conventional storage measurement system can only achieve the acquisition of single signal.At present there have been dual-sensor acquisition technology and multi-gain amplification single-gain technology to ensure the accuracy of the signal in dynamic explosion shock wave measurement,there are still shortcomings in synchronization,sensor network and multiple signal acquisition.This measurement system realizes the time synchronization of the measurement nodes by using the timing function of Beidou module;establishes a large-scale,long-distance and low-power distributed sensor network by using the linear spectrum technology of LoRa.realizes the automatic storage of multiple channels and multiple times by using the partition and management of memory、marker and extraction of effective signals realized by negative delay technology and signal trigger recognition technology,and the baseline adjustment function is designed to improve the applicability of the measurement system.The measurement system realizes microsecond-level synchronization accuracy,a largescale network coverage of 1.6km and intelligent storage of 32 shock waves in the experiment,which can be applied to dynamic explosion shock wave storage measurement.