金属导爆索的爆炸水声特性  

Underwater sound characteristics of metal-clad detonating cords

作　　者：贾虎[1,2] 沈兆武[1] 

机构地区：[1]中国科学技术大学近代力学系,安徽合肥230027 [2]南阳师范学院土木建筑工程学院,河南南阳473061

出　　处：《爆炸与冲击》2011年第4期428-432,共5页Explosion and Shock Waves

基　　金：中国博士后科学基金特别资助项目(201003799);河南省教育厅自然科学研究计划项目(2011B130002);安徽高校省级自然科学研究重大项目(KJ2010ZD003)

摘　　要：为了研究金属导爆索的水声特性,进行了水下爆炸压力测试和气泡脉动实验,获得了金属导爆索水下爆炸冲击波传播和衰减特性及气泡脉动特性。研究了金属导爆索水下爆炸的声压级、声持续时间、混响效应和功率谱特性,结果表明:(1)金属导爆索水下爆炸声压级较高,具有很强的声功率;(2)金属导爆索水下爆炸后产生的气泡脉动和随后产生的大量小气泡持续时间长,能够显著提高水下爆炸的混响效应和持续时间;(3)金属导爆索水下爆炸声的频率范围非常广,在各频率范围内都有很强的能量,尤以低频段能量最高。可见,金属导爆索具有声压级高、频率范围广、混响效应强和声持续时间长的特点。Underwater explosion pressure test and gas bubble pulsation experiment were conducted to obtain the transmission and attenuation properties as well as the gas bubble pulsation properties for the underwater explosion shockwaves of the metal-clad detonating cords.And some underwater explosion performances for the metal-clad detonating cords were explored such as the sound pressure level,sound duration,reverberation effect,and power spectrum.Results show that the metal-clad detonating cords display a high level of sound pressure and sound power;that the gas bubble pulsations following the underwater explosion of the metal-clad detonating cords and the ensuing huge amount of small bubbles will persist for a long time,which can observably increase the reverberation effect and sound duration of the underwater explosion;and that the underwater explosion sound of the metal-clad detonating cords covers a wide range of frequencies,the energy in each of which is powerful,and the energy in the low frequency range is the highest.

关 键 词：爆炸力学 水声特性 水下爆炸 金属导爆索 声压级 功率谱 气泡脉动 

分 类 号：O389[理学—流体力学]