不耦合装药爆炸波时频能分离及能量分布

为了对爆炸特征进行研究,选择了Cohen类分布中的Margenau-Hill分布函数就实测爆炸波信号开展了时频能分析,实现了爆炸波信号的识别定位和爆炸冲击波、应力波和爆生气体膨胀作用下的时频域动应变能密度区分离,通过计算得到了总动应变能和各分区的动应变能。就不耦合系数K和到炮孔中心不同距离R下的各分区动应变能与爆炸后损伤之间的关系进行了对比,提出了与损伤阈值Dcri有关的动应变能阈值Ecri为岩体是否破裂的能量判据。结果表明,动应变能大于Ecri时,岩体才损伤。

Energy separation and distribution of blast wave by nonlinear time frequency transform under air decoupling charge

To study the characteristics of blast wave,margenau-Hill distribution of Cohen classes distribution was selected to analyze the multi-component nonstationary signals tested in middle cavity of structure under the condition of radial air decoupling charge.Energy density zones of the explosion shock wave and stress wave and detonation gas action were identified and separated by MHD.The dynamic strain energy of every zone and the total energy were calculated and the relation between energy and rock damage afte...