船桥碰撞简化动力分析方法:简化动力模型

为促进碰撞有限元分析技术在桥梁设计工程中的应用,提出2种可用于船桥碰撞动力分析和进行船桥碰撞动力设计的简化力学模型,即简化强迫振动模型和简化碰撞模型.基于碰撞数值模拟技术获得这2种模型中简化冲击力和简化船首非线性接触刚度.建议3种简化冲击力的数学模型,即简化的半波正弦载荷、修正半波正弦载荷及多段线载荷.建立3 000 ...

Simplified dynamic analysis method of ship bridge collision: simplified models

To promote the application of finite element analysis into bridge design engineering,two simplified mechanical models which are applied to dynamic analysis and design of ship-bridge collision,i.e.simplified forced oscillation model and simplified collision model,are proposed.Based on the numerical simulation of collision,the simplified impact force and simplified no-linear contact rigidity of ship bow in the two models are obtained.Three kinds of simplified mathematical models for impact are proposed,which are half-wave sine function,modified half-wave sine function and multi-line function.The numerical models of collision are established for the bulk carrier of 3 000 DWT,5 000 DWT,10 000 DWT and 50 000 DWT,then the collisions on rigid wall are calculated under different initial velocity,and the parameters in simplified impact load model and simplified non-linear contact rigidity model are obtained according to equality of impulse and energy.