Abstract
Underwater discharge sound sources are widely utilized. The acoustic signals generated by underwater discharge consist of shock waves and bubble pulsations. The shock wave is a major component of underwater discharge sound sources and is worthy of further study. The minimum-phase cepstrum method is selected to separate the shock wave, and a customized experiment is designed to determine the optimal parameters of this method. The mixed shock wave bubble signal and single shock wave signal are simulated and fitted and are transmitted and received in the anechoic pool, respectively. Different parameters are used to process the signals, and the optimal parameters are selected by comparing the separation results. To verify the validity of the method, the shock waves generated with the same electrode and circuit parameters in the anechoic pool and non-anechoic pool are separated and compared. Experimental results show that this shock wave separation method exhibits significant performance. This method of shock wave separation is of service to the research of underwater discharge acoustic sources.
Highlights
Underwater discharge based on the electrohydraulic effect1 is widely utilized as an effective explosive sound source in many areas, such as ocean exploration,2 water sterilization,3 lithotripsy,4 and wideband acoustic interference.5 Extensive research has been carried out to discover the mechanism and characteristics of underwater plasma discharge shock waves
The signal was processed using the minimum-phase cepstrum method with different parameters of the cepstrum low time window function. The purpose of this method is to separate the shock wave component from the original signal mixed with bubble pulsations and reverberations—the reconstructed waveforms corresponding to the shockwave components
The present study was conducted to design a method to separate the shock wave components from the underwater discharge acoustic signals collected in different water environments
Summary
Underwater discharge based on the electrohydraulic effect is widely utilized as an effective explosive sound source in many areas, such as ocean exploration, water sterilization, lithotripsy, and wideband acoustic interference. Extensive research has been carried out to discover the mechanism and characteristics of underwater plasma discharge shock waves. When the gas switch S is switched on under the action of an external trigger pulse, the high voltage U on the capacitor C is suddenly added to the water gap G, causing G to break down, forming a high temperature, high density, high conductivity discharge channel. This is followed by a rapid discharge of the capacitor C through S and G (with a discharge time of a few nanoseconds to a few milliseconds), generating an extremely strong discharge current (which can reach several thousand A to hundreds of kA magnitude).
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