Research For The Buoyancy And Gravity In The Dynamic Finite Element Numerical Simulation

In recent years, the research for ship-bridge collision has been paid more and more attention.At the same time,the designs of collision facilities for bridges also significantly increased.To make the bridge to be well protected,it’s important to ensure the reliability and the applicability of the facilities when designing them.In reality,it nearly impossible to have the original scale model test.Therefore,The numerical simulation method became very important to help the design of the facilities.But the most important thing is the result of the numerical simulation must be right and applicable.The paper introduced the numerical simulation result of the new collision facility for Wanzhou Changjiang Bridge in LS-DYNA,found a distortion of the result,analyzed the universality of the distortion and tried to solution it.The thesis summarized the relevance theory of numerical simulation in LS-DYNA,used different finite element ship model crashing the new collision facility. The paper introduced the collision facility,found the insufficient of general numerical simulation through the distortion.The thesis focused on the method to supply the gravity and the buoyancy in numerical simulation..The spring replace the gravity,the force on node replace the buoyancy.The result proved the method is applicability.finally,found a new energy-time curve.