The max collision force of ship-bridge collision is one of the most importantreferences for bridge design. By mean linear digital simulation method, the collision forces ofthe collisions between rigid bridge pier and ...The max collision force of ship-bridge collision is one of the most importantreferences for bridge design. By mean linear digital simulation method, the collision forces ofthe collisions between rigid bridge pier and ship bow were calculated out for four different ships,whose tonnages are 5 000,10 000,50 000 and 60 000 DWT respectively. Curves of collisionforce-penetration and absorbed energy-penetration are obtained, and the data of the max loads arethen summarized. On the basis of these curves and data, a set of curves describing therelationships between max collision forces and tonnages of the ships are successfully presented, bywhich the max collision forces of the ships-bridge with different tonnages and in differentvelocities can be estimated easily and reliably.展开更多
A new type energy absorber was introduced,which is composed of thousands of thin ring plates with different diameters.Because it can switch the impact to thousands of shearing actions among thin ring plates inside the...A new type energy absorber was introduced,which is composed of thousands of thin ring plates with different diameters.Because it can switch the impact to thousands of shearing actions among thin ring plates inside the absorber,the impact energy is decentralized and dissipated gradually,the impact acting time is extended and the peak of acceleration is reduced obviously.Numerical simulations by finite element method (FEM) coupled with smoothed particle hydrodynamics (SPH) method were preformed to predict the energy absorption characteristics.Energy absorption ability with different impact velocities was studied and the effects of thickness and material of ring plates were discussed.The sled crash test was carried out to validate the result of simulations.The new type absorber is effective for collision that impact velocity is lower than 40 km/h.展开更多
文摘The max collision force of ship-bridge collision is one of the most importantreferences for bridge design. By mean linear digital simulation method, the collision forces ofthe collisions between rigid bridge pier and ship bow were calculated out for four different ships,whose tonnages are 5 000,10 000,50 000 and 60 000 DWT respectively. Curves of collisionforce-penetration and absorbed energy-penetration are obtained, and the data of the max loads arethen summarized. On the basis of these curves and data, a set of curves describing therelationships between max collision forces and tonnages of the ships are successfully presented, bywhich the max collision forces of the ships-bridge with different tonnages and in differentvelocities can be estimated easily and reliably.
文摘A new type energy absorber was introduced,which is composed of thousands of thin ring plates with different diameters.Because it can switch the impact to thousands of shearing actions among thin ring plates inside the absorber,the impact energy is decentralized and dissipated gradually,the impact acting time is extended and the peak of acceleration is reduced obviously.Numerical simulations by finite element method (FEM) coupled with smoothed particle hydrodynamics (SPH) method were preformed to predict the energy absorption characteristics.Energy absorption ability with different impact velocities was studied and the effects of thickness and material of ring plates were discussed.The sled crash test was carried out to validate the result of simulations.The new type absorber is effective for collision that impact velocity is lower than 40 km/h.
