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该文以轻质金字塔点阵夹层平板结构为对象,对其在不同撞水速度下(1m/s~6m/s)的流-固耦合动力学行为进行数值和理论计算分析。首先建立了气-液-固三相数值模型,通过详细计算获得了砰击压力的分布特征与结构砰击变形特征,分析表明当砰击压力脉宽和结构自振周期(湿模态)之比大于4时流-固耦合效应不显著。与同等质量实体板相比,轻质金字塔点阵夹层平板平均流-固砰击压力与结构最大变形均显著降低,而且存在“局部气垫”现象(在实体平板撞水的过程中未发现该效应)。提出一种将砰击变形位移场分解为总体变形和局部变形,然后进行叠加的计算模型,该种工程近似计算方法获得的变形估算值与数值计算结果吻合较好。
In this paper, the light-pyramid lattice sandwich plate structure is taken as the object, the numerical and theoretical calculation of the fluid-solid coupling dynamics under different water impact velocity (1m / s ~ 6m / s) is carried out. Firstly, the gas-liquid-solid three-phase numerical model was established. The distribution characteristics of slamming pressure and the slamming deformation characteristics of the structure were obtained by detailed calculation. The results show that when the slamming pressure pulse width and the natural period of the structure (wet mode) The ratio of flow-solid coupling is not significant when the ratio is greater than 4. Compared with the same quality solid plate, the average flow-solid slamming pressure and the maximum structure deformation of the lightweight pyramid lattice sandwich slab are significantly reduced, and there is a phenomenon of “local air cushion ” (not found in the real slab bumped water This effect). This paper presents a calculation model which decomposes the slamming deformation and displacement field into the overall deformation and the local deformation and then superposes them. The estimated deformation obtained by the approximate calculation method of this kind of engineering is in good agreement with the numerical calculation.