CAJ | 학술논문

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.
수하폭작재하작용하함선결구적편상운동불부수충격파재하적영향,이차여기포맥동재하밀절상관.이상조건하,수면함선편상향응적축비모형시험예측필수재리심궤혹증압수지내진행,저양재능보증충격여기포재하재정개역학공간상적일치성,저대우통상채용적대척도모형편상시험래설,현연불절실제.지전,작자제출일개전문적칭위재하내부자공간적축비모형방법(LIS Scaling Method),능구재여원형재하조건긴밀상련적특정자공간내모의수하폭작재하여편상향응.문중장해방법용우수면함선,통과정심설계적“원형”화“자모형”수하폭작편상향응모형대비시험연구진행험증,결과표명,원형여자모형적편상향응통과LIS방법환산후,유비상호적일치성.차외,발현조니수모형편상향응적폭치이변화.
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 me-chanical 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 pro-posed 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 scal-ing method was applied to a surface ship, and two experiments including one prototype and one sub-scale 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.