摘要
针对尾部空腔结构的落水冲击问题,在考虑水的可压缩性的非线性双渐近法(NDAA)基础上,经推导建立尾部带空腔的复杂结构落水的数学模型。在与实验值对比验证程序有效性的基础上,对结构落水过程中表面水动力载荷及其结构响应进行计算。分析了结构落水过程中的局部薄弱环节。研究了不同落水角度下结构表面水动力载荷变化规律。研究结果表明:空腔结构落水过程中,在俯仰角45°～90°范围内结构所受水动力载荷与俯仰角并非线性相关,落水的危险工况为75°左右。
Using the nonlinear doubly asymptotic approximation （NDAA） and considering the compressibility of water, a mathematical model for a water entry of a complex cylindrical cavitary structure was deduced and built. By comparing the results of numerical calculation with those of tests, the reasonability of the simulation procedure was validated. The hydrodynamic loads and response of the structure falling into water were computed and the local weak parts of the structure were analyzed. The structural surface hydrodynamic loads varying were studied. The results indicated that there is a non-linear relationship between and the pitching angle range of 45° to 90° , and the dangerous working condition laws under different water falling angles the hydrodynamic loads of the structure is at about 75°.
出处
《振动与冲击》
EI
CSCD
北大核心
2013年第20期113-118,共6页
Journal of Vibration and Shock
基金
国防基础科研(B2420110011)
中央高校基本科研业务费(HEUCF130107)
