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为了获得连续水下爆炸声源,文章设计了金属导爆索网栅结构,并开展了水下爆炸压力测试和气泡脉动实验,研究了金属导爆索网栅结构水下爆炸的声压级特性,水下爆炸的声持续时间,对应的混响效应,利用Hilbert-Huang变换对水下爆炸信号的频谱特性进行了分析。研究结果表明:金属导爆索网栅结构水下爆炸可根据设计连续产生多个脉冲冲击波信号,形成近似平稳的连续波,随后产生的气泡脉动和混响效应能够明显提高水下爆炸声的持续时间;金属导爆索网栅结构具有很强的声功率,水下爆炸声压级最高能够达到249 d B,爆炸60 ms后金属导爆索的爆炸声压级仍在200 d B以上;金属导爆索网栅结构水下爆炸声频率范围广,在100 kHz以下低频段能量最高。金属导爆索网栅结构水下爆炸脉冲信号频率成分丰富,具有低频和瞬时的特点,且大部分集中在100 kHz以下,尤以50 kHz以下的最为明显;脉冲信号具有多个能量峰值,能量值较集中,波动能量基本上都集中在频率为100 kHz范围以内,尤以50 kHz以下的低频能量最大,高于100 kHz以上频段的能量的分量很小。脉冲冲击波的个数和声持续时间可由金属导爆索网栅的排列方式和长度控制,脉冲冲击波间的时间间隔可调,发生装置稳定易控。
In order to obtain a continuous underwater explosion source, a metal detonating cable grid structure was designed, and underwater explosion pressure test and bubble pulsation test were carried out. The sound pressure level characteristics of underwater detonation of metal detonating cable grid structure , Duration of underwater explosion, corresponding reverberation effect, and the spectral characteristics of underwater explosion signal were analyzed by using Hilbert-Huang transform. The results show that the explosion of the metal detonating cable grid structure can produce several continuous pulse shock wave signals according to the design to form an approximately steady continuous wave. The subsequent bubble ripple and reverberation effects can significantly increase the underwater explosion sound Time; the metal detonating cable grid structure has a strong acoustic power, the maximum sound pressure level of underwater explosion can reach 249 d B, the explosion sound pressure level of the metal detonating cable is still above 200 d B after 60 ms of explosion; the metal Detonation grid structure underwater explosion sound a wide range of frequencies, the highest in the low frequency band below 100 kHz. Metal detonating cable grid structure underwater explosion pulse signal frequency rich in composition, with low frequency and instantaneous characteristics, and most of them concentrated below 100 kHz, especially below 50 kHz most obvious; pulse signal has multiple energy peaks, energy The values are more concentrated, and the fluctuation energy is basically concentrated in the frequency range of 100 kHz. Especially, the low-frequency energy below 50 kHz is the largest, and the energy components above 100 kHz are small in energy. The number and duration of the impulse shock wave can be controlled by the arrangement and length of the metal detonating cable grid. The time interval between the impulse shock waves is adjustable, and the device is stable and easy to control.