某大型货物滚装船上层建筑振动分析及控制

Vibration Analysis and Control of Superstructure of a Large Cargo RoRo Ship

针对某大型货物滚装船上层建筑局部区域在试航阶段出现的振动问题,采用有限元分析方法,建立全船模型计算该船的自由模态。以避开共振频率、提高频率储备为原则,对上层建筑局部区域提出几种减振方案,继而对该船螺旋桨和主机激励作用下的频率响应进行分析,得到响应速度定量分析结果,选取最优方案应用于实船中。经航行试验验证,该减振方案能有效降低实船振动水平,可供同类型船的设计和建造参考。

Aiming at the vibration problem of a large cargo RoRo ship’s superstructure during the trial period,the finite element analysis method is adopted to establish the whole ship model to calculate the free mode of the ship.Based on the principle of avoiding the resonance frequency and increasing the frequency reserve,several vibration reduction schemes are proposed for the local area of the superstructure,and then the frequency response under the excitation of the propeller and the main engine of the ship is analyzed,and the quantitative analysis result of the response speed is obtained.Select the best plan and apply it to the actual ship.It has been verified by sailing tests that the vibration reduction scheme can effectively reduce the vibration level of the actual ship,which can be used as a reference for the design and construction of the same type of ship.