| With the development in technology, stealth military weapons in modern warfare are playing an important role. Stealth submarines are a kind of stealth weapons. The key of stealth technology is coated sound-absorbing material in the submarine's hull. The study found that the submarine coated with sound-absorbing materials can very well absorb the sonar sound waves whose bandwidth is 3kHz-5kHz, but sound wave on the range of 1kHz-3kHz still have a very strong reflection effect. In order to detect such stealth submarine, safe and reliable 1kHz-3kHz sound source becomes the primary task of anti-stealth submarines. Conventional methods is casting explosives to the waters in which submarines may have hidden and low-frequency sound waves generated by explosions (1kHz-3kHz) can be. used to test and analyze whether the existence of stealth submarines. This method has many shortcomings and uncertainties. High-current pulsed discharge will be applied to the military field in this article and a high-power low frequency underwater sound source is developed. The sound source has the following advantages:safe operation, low-cost, no pollution, no harm to marine life, automatic control, a wide spectrum of acoustic signals, and high efficiency. Related theories have been discussed in detail. The main work includes the following sections:Stealth target detection status and the development of sound source are introduced. The possibility of detecting stealth submarines using high-current discharge in water has been analyzed and has been tested. Test results show that this kind of sound source can replace the traditional methods of stealth submarine detection. The advantages and disadvantages of this new sound source are analyzed.Three-phase LC resonant constant-current charge circuit has been analyzed and discussed base on single LC resonant constant-current charge theory. In order to test the correctness of theory, the experiment of three-phase constant-current charge is completed. Experimental results further validate the three-phase resonant constant current charging method is feasible. Three-phase constant-current charging system is finally completed. Capacitors can be charged from 0 kV to 45kV in two seconds with this system.The discharge circuit is designed. Taking into capacitor discharge current is close to 240kA, so capacitors are paralleled in group. This design not only reduces the requirements on the discharge circuit components, but also can improve the stability and security of the device. Three-electrode spark gap switch filled with nitrogen and long life underwater electrodes are designed.Underwater electrode gap is the discharge load and is a decisive part of the electrical energy into sound energy. Therefore, the discharge effect is determined by the resistance of the water gap. The constant resistance discharge model and the time-varying resistance discharge model of underwater gap resistance are established. All the parameters that calculated using two models are compared with experimental measurements. The results indicate that this approach provide a reasonable agreement with experimental measurements and can be used for the estimation of the characteristic of underwater pulse discharge.The relationship between electrical parameters and acoustic parameters is studied by experimental methods.Finally, the experimental result of acoustic source at sea is given in this paper. Acoustic source fully meet the requirements of technical indicators (Discharge time interval:≤2 seconds; Sound wave frequency bandwidth (1-3) kHz; The main pressure pulse peak PM≥1MPa)...
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