基于舱段数据的整船冲击环境组合预报方法

Combined Method for Forecasting the Impact Environment of Whole Ship based on Cabin Data

随着舰载设备抗冲击研究的不断发展,能否准确预报水下圆柱壳的整体冲击环境对于设备的布置与安装具有重大意义。对圆柱壳进行水下爆炸试验是一种具有较高可信度的研究手段,但成本巨大,相对而言,舱段试验较为容易方便。对比舱段与整体水下圆柱壳的冲击环境差异,发现水下圆柱壳与舱段的冲击环境差异主要集中于低频段,水下圆柱壳的低频响应以低阶振动模态为主,而舱段的低频响应以刚体运动为主。根据上述差异,结合经验模态分解法、船体梁理论,提出以舱段冲击环境数据来预报整个圆柱壳冲击环境的组合方法,得到较高的拟合精度。

With the development of anti-shock research of equipment on navy ships,accurate prediction of the impact environment of the underwater cylindrical shells is of great significance for equipment distribution and installation.Underwater explosion experimental research on cylindrical shell is a high reliability measure,but it is very costly.While the cabin test is relatively simple and convenient.In this paper,the impact environments of the cabin and whole underwater cylindrical shell are compared mutually.It is found that the difference mainly exists in the low frequency range.The low frequency response of the underwater cylindrical shell is dominated by low order vibration modes,while the low frequency response of the cabin is mainly rigid body motion.According to the difference,a combination method of ship hull girder whipping motion theory with empirical mode decomposition method is put forward to forecast the impact environment of whole cylindrical shell.Results show that this method has a high simulation precision.