载荷内部子空间缩比方法在水面舰船水下爆炸鞭状响应试验上的应用(英文)

Application of the Loading Inherent Subspace Scaling Method on the Whipping Responses Test of a Surface Ship to Underwater Explosions

水下爆炸载荷作用下舰船结构的鞭状运动不仅受冲击波载荷的影响,而且与气泡脉动载荷密切相关。理想条件下,水面舰船鞭状响应的缩比模型试验预测必须在离心机或增压水池内进行,这样才能保证冲击与气泡载荷在整个力学空间上的一致性,这对于通常采用的大尺度模型鞭状试验来说,显然不切实际。之前,作者提出一个专门的称为载荷内部子空间的缩比模型方法(LIS Scaling Method),能够在与原型载荷条件紧密相连的特定子空间内模拟水下爆炸载荷与鞭状响应。文中将该方法用于水面舰船,通过精心设计的"原型"和"子模型"水下爆炸鞭状响应模型对比试验研究进行验证,结果表明,原型与子模型的鞭状响应通过 LIS 方法换算后,有非常好的一致性。此外,发现阻尼随模型鞭状响应的幅值而变化。

The whipping response of a ship structure to underwater explosion is relevant not only to the shock wave load but also to the bubble load. So the ideal subscale underwater explosion test for whipping responses of a surface ship must be executed on a centrifuge machine or in an air pressure modifiable pond that can insure the consistency of shock wave and bubble load in the whole mechanical space, and it is not practical for big model that is usually used for whipping responses test. Previously, a special scaling method called Loading Inherent Subspace （LIS） scaling method was proposed by authors, which can simulate the underwater explosion loadings and the whipping responses in a specific subspace that is concerned with load condition of prototype. In this paper, the LIS scaling method was applied to a surface ship, and two experiments including one prototype and one subscale model of whipping responses to underwater explosion were carried out and the responses were compared with each other. The results show that the responses are consistent between the prototype and the subscale model and the ratio of critical damping varies with the amplitude of responses.