非接触水下爆炸作用下舰船动态响应研究
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摘要
运用有限元软件ABAQUS对舰船水下爆炸进行数值模拟,运用HHT变换分析了冲击响应信号。为舰船动态响应的分析提供输入条件,得到爆炸载荷作用下舰船关键部位的冲击环境。分析结果表明:冲击波响应分布的频带较宽,具有瞬时性和衰减快的特点,水下爆炸作用下舰船动态响应包含丰富的频率成分,易造成舰船结构的局部破坏;气泡脉动响应频率低,易造成舰船的整体破坏,响应频率接近舰船结构的固有频率,衰减慢,持续时间长。研究结果对于舰船生命力评估具有一定参考价值。
Based on commercial finite element procedure ABAQUS to the structure numerical simulation of underwater explosion,we can obtain the essential part shock environment of structure under the shock function,which provides the input for the dynamic response analysis of warships.With HHT method a signal of typical part on a warship produced by non-contact underwater explosion is applied.The analysis result indicated that warship dynamic response contains a wealth of frequency components.Shock response to the distribution is of a wide-band,and it has a transient,fast and energy of high attenuation characteristics,which could easily lead to the partial destruction of structure.Pulsating bubble response is of low frequency,slow decay and long duration,and response frequency is close to warship natural frequency,which is easy to the overall damage to structure.Research results are valuable in evaluating the vulnerability of warships.
Based on commercial finite element procedure ABAQUS to the structure numerical simulation of underwater explosion,we can obtain the essential part shock environment of structure under the shock function,which provides the input for the dynamic response analysis of warships.With HHT method a signal of typical part on a warship produced by non-contact underwater explosion is applied.The analysis result indicated that warship dynamic response contains a wealth of frequency components.Shock response to the distribution is of a wide-band,and it has a transient,fast and energy of high attenuation characteristics,which could easily lead to the partial destruction of structure.Pulsating bubble response is of low frequency,slow decay and long duration,and response frequency is close to warship natural frequency,which is easy to the overall damage to structure.Research results are valuable in evaluating the vulnerability of warships.
引文
[1]姚熊亮,张阿漫,许维军,汪玉.基于ABAQUS软件的舰船水下爆炸研究[J].哈尔滨工程大学学报,2006,27(1):37-41.
[2]WOVAK D B.Modeling Submerged Structures Loaded byUnderwater Explosions with ABAQUS/Explicit[C].ABAQUS Users’Conference.2002.
[3]姚熊亮,徐小刚,张凤香.流场网格划分对水下爆炸结构响应的影响[J].哈尔滨工程大学学报,2003,6(3):238-244.
[4]温华兵,尹群,张健,等.水下爆炸船舱冲击响应时频特征的小波包分析[J].工程力学,2008,25(6):199-203.
[5]姚熊亮,张阿漫.经验模态分解方法在结构冲击信号分析中的应用[J].中国舰船研究,2008,1(4):11-15.
[6]陈子雄,吴琛,周瑞忠.希尔伯特—黄变换谱及其在地震信号分析中的应用[J].福州大学学报,2006,34(2):260-264.
[2]WOVAK D B.Modeling Submerged Structures Loaded byUnderwater Explosions with ABAQUS/Explicit[C].ABAQUS Users’Conference.2002.
[3]姚熊亮,徐小刚,张凤香.流场网格划分对水下爆炸结构响应的影响[J].哈尔滨工程大学学报,2003,6(3):238-244.
[4]温华兵,尹群,张健,等.水下爆炸船舱冲击响应时频特征的小波包分析[J].工程力学,2008,25(6):199-203.
[5]姚熊亮,张阿漫.经验模态分解方法在结构冲击信号分析中的应用[J].中国舰船研究,2008,1(4):11-15.
[6]陈子雄,吴琛,周瑞忠.希尔伯特—黄变换谱及其在地震信号分析中的应用[J].福州大学学报,2006,34(2):260-264.
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