0 Introduction

The importance of underwater explosion shock wave pressure testing system is emphasized, and the mainstream status and existing problems of lead testing method are introduced. At the same time, the advantages and disadvantages of wireless storage testing methods and several improvement schemes proposed in the literature were also discussed. Finally, a design of an underwater explosion shock wave pressure testing system based on Raspberry Pi was proposed, which has advantages such as portability, low cost, and real-time data collection and analysis.

1. Overall System Design

The underwater explosion shock wave pressure testing system adopts a combination of software and hardware design to achieve remote control and monitoring functions.

2. System hardware design

The Raspberry Pi serves as the core processor and key hardware platform, as well as the hardware design of the shock wave pressure acquisition module and 4G communication module. Among them, the shock wave pressure acquisition module consists of an IEPE sensor constant current source and an AD9226 analog-to-digital conversion circuit, and is externally connected to an IEPE type underwater free field pressure sensor to achieve the acquisition of shock wave pressure signals. The 4G communication module adopts SIM7600G-H-M2 4G HAT core board, supporting 4G/3G/2G communication in global frequency bands. It can be connected to Raspberry Pi through USB interface for hardware connection and related parameter configuration.

3 System software design

The system software part of the underwater explosion shock wave pressure testing system design includes sensor data acquisition, data transmission cloud platform, upper computer visualization, and VNC interface construction. The specific content includes:

4 Simulation testing experiments

Selection of experimental methods, testing of experimental results, and comparison of results. Firstly, the equipment and methods used in the experiment were introduced, including signal generators, sensor simulators, digital oscilloscopes, etc., as well as the simulation testing flowchart. Next, the performance of the testing system was tested with emphasis. By collecting sine wave signals at different sampling rates and comparing the sampling results, it was demonstrated that the testing system can collect and display sine wave signals in real time, with stable and clear signal waveforms, and no obvious spurious or noise. Finally, the statistical characteristics of sine wave signals collected by oscilloscopes and testing systems at two different sampling frequencies were compared, and the experimental results were summarized.

5 Conclusion

Design of an underwater explosion shock wave pressure testing system based on Raspberry Pi, which has remote monitoring and management functions, and has advantages over traditional wired testing systems and existing wireless storage testing systems. However, the system has issues such as signal acquisition bias and experimental verification only simulating characteristics, which require further testing and improvement in the future. To solve the above problems, we have started designing underwater protective sealed cabins and collaborating with relevant units to conduct underwater explosion tests.