Abstract
With respect to the calibration of dynamic pressure measurement system under specific underwater explosion application environment, this paper has proposed an experimental calculation method for the dynamic characteristics of underwater shock water pressure sensor based on a preloaded water shock tube. This was done by analyzing the dynamic calibration principles of the preloaded water shock tube and studying the dynamic influencing factors pertaining to the sensor. Moreover, a dynamic calibration experiment for the sensor was also designed based on a comparative calibration method, through which a calculation method for the dynamic characteristics of underwater shock wave pressure sensor was acquired. The experimental results have proven that applying preloaded water shock tube can effectively acquire the dynamic characteristics of the pressure sensor, thereby providing a research framework for the dynamic calibration of underwater explosion shock wave pressure sensor.
Highlights
The underwater shock wave is one of the main forms of underwater explosion
Gong and Li [9] further proposed a dynamic calibration method for preloaded water shock tubes. This method uses the basis of the Quasi δ pulse calibration theory [10,12] to analyze the dynamic characteristics of pressure sensor, and processed shock wave signals in the water shock tube as δ signal, instead of applying the standard pressure sensor, to consider the signal measured by calibrated pressure sensor as impulse response and directly calculate dynamic characteristics of calibrated sensor, resulting in large error
When conducting the experimental calculation of dynamic characteristics for underwater shock wave pressure sensor, a static preload P shall firstly be applied to the pipes through a pressure pump of preloading device, and the explosion source shall be initiated at the special pressure and water proof detonator point in the pipeline center to generate an underwater explosion shock wave
Summary
The underwater shock wave is one of the main forms of underwater explosion. According to a large number of experimental data, shock wave energy in preliminary test of underwater explosion is about a half of the total energy of underwater explosion [1]. The scheme applies water shock tube with preload capacity, through detonating explosives by detonation control system, generates Quasi δ pulse pressure signal in water shock tube Such signal cannot be acquired accurately based on physical relationship, so the comparative calibration method needs to be applied to treat the underwater shock wave pressure signal as the pressure drive signal, which will be acted on the standard pressure sensor and the calibrated sensor respectively. When conducting the experimental calculation of dynamic characteristics for underwater shock wave pressure sensor, a static preload P shall firstly be applied to the pipes through a pressure pump of preloading device, and the explosion source shall be initiated at the special pressure and water proof detonator point in the pipeline center to generate an underwater explosion shock wave. Experimental analysis for the dynamic characteristics of underwater shock wave pressure sensor
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