升船机承船厢中水-船简化动力模型研究

Study on simplified dynamic model of water-ship system in shiplift

升船机承船厢内水体对承船厢壁的动水压力明显受船舶影响,但目前工程分析中尚无较完善的水-船体系简化模型。考虑船舶对晃动水体的影响,以Housner模型为基础,提出了有效水深和有效水宽概念并给出表达式,考察了有效水深和有效水宽对动水脉冲压力合力、对流压力合力及其作用高度的影响,以势流体模型计算的动水压力合力为参照得到有效水深和有效水宽表达式中的参数,进而得到了修正的Housner模型。通过与势流体模型得到的力矩进行比较及在不同吨位承船厢和船舶的应用,验证了本文模型的正确性和通用性。本文模型精度较高,使用方便,可适用于承船厢的动力特性分析,以及动力荷载作用下承船厢的受力分析。

The dynamic water pressure on the wall of the ship-chamber of the shiplift is obviously affected by the ship,but there is no good simplified model of the water-ship system in the engineering analysis at present.Considering the influence of ship on water body,based on the Housner model,the concept of effective depth and effective width of the water are presented and the expressions of them are given.The influences of effective depth and effective width on resultant forces of pulse pressure and convection pressure and their locations are investigated.The parameters in the expressions are got in the reference of the resultant force of the dynamic water pressure calculated with the potential fluid model,and then the modified Housner model is obtained.The correctness and the generality of the modified model are verified by the comparison with the resultant moment from potential fluid model and the application in shiplift and ship with different tonnage.The model is of high precision,convenient for application,and appropriate for the analysis of the dynamic characteristics of the ship-chamber,as well as the stress analysis of the ship-chamber under seismic load.