爆炸载荷作用下舰船板架的变形与断裂研究综述

  目的  对于被动式抗冲隔离器而言，库仑阻尼可以主动应用或被动存在于隔冲系统中，因此有必要分析库仑阻尼在隔冲系统中的作用规律。  方法  建立库仑阻尼的抗冲隔离模型，利用其分段特性对系统模型进行表达，分析单位脉冲信号、半正弦波信号、梯形波信号、正/负双波信号下的库仑阻尼系统冲击响应，以及不同输入脉宽下的系统冲击放大特性。
  结果  仿真结果表明：在半正弦波信号作用下，系统的绝对加速度响应峰值在1.75倍脉宽附近，当输入脉宽大于0.265倍系统周期时，系统将失去隔冲性能，且系统响应进入放大区；在系统峰值、输入脉宽相同的条件下，梯形波信号作用下的系统响应大于半正弦波信号，且库仑阻尼隔冲系统对梯形波信号脉宽的变化更为敏感。  结论  研究成果可为库仑阻尼在抗冲隔离器中的应用提供参考。

Review for deformation and fracture behavior of ship stiffened plate subjected to blast loading

  Objective  For passive shock isolators, Coulomb damping can be actively applied or passively present in the shock-isolation system, so it is necessary to analyze the law of function of Coulomb damping in the shock-isolation system.  Methods  The shock isolation model with Coulomb damping was established to use the segmentation characteristic of Coulomb damping to express the system model, study the shock response of the Coulomb damping system under different input signals, and analyze the shock amplification characteristics of the system under different input pulse widths in this paper.  Results  The simulation results show that the absolute acceleration response peak of the system under the action of half sinusoidal signal generally occurs at 1.75 times pulse width.
When the input pulse width is greater than 0.265 times of the system period, the system loses the isolation performance and the system response enters the amplification area. Comparing the system response of half sine and trapezoidal waves under the condition of same peak and pulse width, the system response under the trapezoidal signal is larger and more sensitive to the change of trapezoidal wave signal pulse width.  Conclusions  The study in this paper has certain guiding significance for the application of Coulomb damping in shock isolators.