两种典型装载工况下阿芙拉型油船振动特性预报与分析

Prediction and Analysis of Vibration Characteristics of Aframax Oil Tanker under Two Typical Loading Conditions

船舶在海上航行时,会历经多种装载工况,其中又以压载工况和满载工况这两种装载工况最为典型。在这两种典型工况下,船舶的振动性能是不同的。利用有限元法分别对在压载装载工况和满载装载工况下的11.4万吨阿芙拉型油船进行全船振动特性预报和振动性能分析,计算得到在两种不同装载工况下的全船固有频率及其振型、在螺旋桨脉动压力和主机激振力作用下的强迫振动响应值。计算结果表明,在两种不同的典型装载工况下,11.4万吨阿芙拉型油船的振动性能良好,满足ISO 6954-2000的振动衡准。

When a ship sails in the sea,it will experience a variety of loading conditions,among which ballast condition and full load condition are the two typical loading conditions.Under these two typical working conditions,the ship's vibration performance is different.In this paper,the finite element method is used for vibration feature prediction and analysis of the 114000 tons Aframax oil tanker in the ballast condition and the full loading condition.The inherent frequencies and vibration modes of the whole oil tanker and the forced vibration response excited by the propeller fluctuating pressure and the main engine operation are obtained under the two loading conditions.The results show that the vibration performance of the 114000 tons Aframax tanker ship is good and meets the vibration criterion of ISO 6954–2000 under the two typical loading conditions.