十字交叉梁模型的塑性动力响应计算方法

摘要

The hull grillage beam’s plastic dynamic response in underwater explosion is one of the most important work in the study of anti-explosion performance. The precision of the finite element method used to solve the problem cannot be guaranteed, and the analytic method has technical difficulties. In view of that, a kind of deflection deformation calculation method that hull grillage beam was simplified into a rigid-plastic cross beam, and there is force acted on the correlation place of in the transverse and longitudinal member is put forward, through the theorem of momentum and the moment of momentum constant motion e-quation. Finally, by using this method to calculate the data, the results agree well with the test ’s and this proves that the selection of the mechanical model is rational, and illustrates that the calculation method, used for the hull grillage beam’s deflection of non-contact underwater explosion, which guarantees the cal-culation efficiency and precision, has engineering practicability.%船体板架在水下爆炸载荷作用下的塑性动力响应计算是舰船抗爆性能研究中的一项重要工作，鉴于有限元法对其求解的计算效率无法保证，同时解析法对其求解有技术上的困难等研究现状，提出了一种将船体板架结构简化成刚塑性十字交叉梁，并通过动量定理和动量矩定理由运动方程推导出十字交叉梁结构中横向和纵向构件二者在关联处有力的相互作用时的变形挠度的计算方法。利用此方法计算所得的结果，与实船舱段的有限元模型结果，以及实船舱段的水下爆炸试验的数据进行对比后，吻合较好。结果表明，力学模型选取是合理的，用于水下非接触爆炸的舰船板架挠度变形计算方法不仅保证了计算效率，也保证了计算精度，具有工程实用性。