Underwater explosion pressure measurement device based on improved Hopkinson rod

Abstract

The invention provides a subaqueous explosion pressure measurement device based on an improved Hopkinson bar, and is used for measuring shock wave pressure and bubble jet pressure of subaqueous shortest field explosion. The subaqueous explosion pressure measurement device comprises an energy absorption and recovery device which absorbs all the subaqueous explosion shock wave pressure pulse kinetic energy falling into flying sheets; a shock wave load separation device which is used for transferring all the subaqueous explosion shock wave pressure pulse in the improved Hopkinson bar to the flying sheets so as to realize shock wave load separation; and an improved Hopkinson bar measurement element which is used for amplifying subaqueous explosion shock wave pressure and bubble jet pressure signals and realizing shock wave load separation with the help of the shock wave load separation device so as to finally realize time-space separated measurement of the shock wave pressure and the bubble jet pressure of subaqueous shortest field explosion.

Description

technical field [0001] The invention relates to an underwater explosion pressure measuring device based on an improved Hopkinson rod, which belongs to the field of underwater explosion pressure sensor design. Background technique [0002] Accurate underwater explosion pressure measurement results can provide input load conditions for studying the dynamic response and damage of structures under underwater explosion. However, the demand for pressure sensors under the action of near-field and contact explosions is becoming more and more urgent. Although thanks to the continuous progress and innovation of measurement technology, the current free-field pressure measurement technology is relatively mature, but there is still no effective measurement method for underwater explosion wall pressure measurement at home and abroad. [0003] The current measurement method has the following problems: the current wall pressure measurement is only for the explosion situation in the middle ...

AI Technical Summary

Problems solved by technology

Although thanks to the continuous progress and innovation of measurement technology, the current free-field pressure measurement technology is relatively mature, but for the measurement of underwater explosion wall pressure, there is still no effective measurement method at home and abroad.

[0003] The current measurement method has the following problems: the current wall pressure measurement is only for the explosion situation in the middle and far field, and the principle of the bubble jet measurement part has not been solved; the wall pressure sensors in foreign countries are based on the piezoresistive and piezoelectric materials. developed with features

This type of sensor has a small range, poor thermal stability, and severe nonlinearity, so it cannot be used in high temperature situations. At the same time, problems such as easy failure, premature failure, and short recording time have been exposed in the test, and it needs to be improved.

In underwater explosion pressure measurement, on the one hand, the sensor is easily damaged by detonator fragments and explosive detonation products; on the other hand, the pressure measurement range of sensitive components such as tourmaline is limited, making it difficult to achieve close-range pressure measurement of explosive underwater explosion

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