Abstract
Curved reflection bunching technique of underwater plasma sound source (UPSS) uses the geometric characteristics of the curved reflector to reflect and bunching intense sound shock wave, so the center position error of the sound source is one of the important factors affecting the bunching performance of the shock wave. In this paper, the cause of the sound source position error is analyzed in detail, and nonlinear finite element software ANSYS/LS-DYNA (dynamic analysis software developed by LSTC) is used to establish the model of the shock wave bunching sound field. Through numerical simulations, the shock wave bunching sound field distribution characteristics under the influence of different position errors are comprehensively simulated, and the bunching performance of the shock wave and its influence law are deeply analyzed according to the simulation results. It provides guidance for reasonably controlling the machining error and installation error of the reflector and discharge electrode, estimating the effective discharge times of the discharge electrode, and formulating the design process.
Highlights
underwater plasma sound source (UPSS) technology can be used to realize narrow-pulse ultrawideband (UWB) sonar detection system, which breaks through the limitations of traditional sonar signal carrier modulation technology [1, 2]
This technology has been widely used in civil fields such as extracorporeal shock wave lithotripsy, water treatment, oil pipeline blockage removal, rock fragmentation, and marine resources exploration
E shock wave signal generated by UPSS arc discharge has weak directivity or no directivity, and the curved reflection bunching technology can be used to make the signal directional radiation and improve the radiation energy of the signal in the specified area
Summary
UPSS technology can be used to realize narrow-pulse ultrawideband (UWB) sonar detection system, which breaks through the limitations of traditional sonar signal carrier modulation technology [1, 2] It has the advantages of high emission sound source level (up to 260 dB), wide frequency bandwidth (bandwidth between tens of hertz and hundreds of kilohertz), high electroacoustic conversion efficiency, high distance resolution, strong penetration ability, and strong anti-interference ability [1,2,3,4,5]. E influence of different sound source position errors, such as the machining error of electrode installation hole at the bottom of reflector, the machining and installation error of discharge electrode, and the ablation of discharge electrode, on the distribution characteristics of shock wave bunching sound field is analyzed by numerical simulation method. The nonlinear finite element analysis method is used to establish the reflection bunching sound field model of shock wave. e influence of different sound source position errors, such as the machining error of electrode installation hole at the bottom of reflector, the machining and installation error of discharge electrode, and the ablation of discharge electrode, on the distribution characteristics of shock wave bunching sound field is analyzed by numerical simulation method. erefore, the research in this paper has important practical significance for understanding the influence of source center position error on the characteristics of curved reflection bunching
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