水下爆炸毁伤水下目标的能量分布特征

 针对某水下目标的抗水下爆炸实验数据，利用小波包良好的时频局部化性质，对被监测水下目标内部装置的冲击加速度信号进行了能量分析，得到了冲击信号的时频分布和不同频带上的能量分布。冲击信号的频带能量分布与目标毁伤的关系密切，选用冲击信号峰值、冲击信号主振频带能量、水下目标内部装置自振频率所在频带能量作为判别因子，建立距离判别模型，对水下目标毁伤情况进行了预测；利用回代估计法对模型的合理性进行了检验。研究结果表明，预测结果与实际结果相符，证明将频带能量作为水下爆炸毁伤水下目标的特征指标是合理的。

Features of Energy Distribution of Underwater Target by Underwater Explosion

Based on the experimental data of an underwater target bombed by underwater explosion, the energy was studied by means of monitoring interior acceleration signals and wavelet packet analysis with high resolvability and localization. By using the monitored signals, the time-frequency distributions and the energy distributions in blasting frequency bands were obtained. Considering the close relation between energy distribution for different frequency bands and the damaged target effect, the peak acceleration, the energy on dominant frequency bands and natural frequency bands of interior device were taken into account as discrimination factors. A discrimination model was proposed and the re-substitution method was used to verify the stability of model. The results show that the predicted results are consistent with actual values, and prove that the choice of bands energy as an damage index is reasonable.