文档介绍：,人学硕士学位论文
摘 要
睫黄经济zk平翅人们生潘矮塞黪提嵩,入{fj对船舷振动经能豹要求越来越裔,很多船舶在设计之初没有进行振动预报,或者总振动圃寅频率预报不太琅确,导致交船藏运謦孵出现有害据渤,影赡船黯燕常靛行稻舰船隐蔽牲。黻前人们怒再近似公式或一维梁模型计算船舶围有频率,辩四节点以下派动的预报还是比较臻确的,毽是对四萤点以上掇魂黪计簿准确发裁下降缀大,这是由于离阶对船体骛坜变形的影晌交大。丽嗣三维空间有限元方法计算总振动嘲有频率是比较准确的,但是耗费肘阃和糖力郝比较多。
本文首先建立了110000t灞轮静三维有鞭元模翟,蹋膏蔽元分析软件ANSYS中的 SHELL63、BEAM24、PIPEl6和MASS21毂耪类型共13988个擎元对鼹体结格进嚣蠢黢元离散,月三维有限元技术对其在,℃种不躅状态下进行了纛商粕永平六节点以下豳商频率的计算。又用一缎粱有限元方法计算了船舶在腰载和均匀装载两静状态下的霾翔謦程水平六节点娃下蠲裔频率。
然后通过嗣一维梁有限元方法瓣四条实船进行计算,嚣已有的三维有隈嚣方法嗣露频率计箨结果邀芎亍统计分孝厅,掇出了怼一维梁宥黻元计弊方法中葑切影响的修延,并爝 110000t油轮进行了验证。结果证明本文方法能毒效提藏一维梁肖眼元计算方法鳇壤臻躞,对于快速准确懿颧旅船舶总强动萄有频率很有意义。
疆后对均匀愿载、均匀装载、不鼹鞲韪压载鄹隔熬装载砖趁态下1t0000t滚轮三维寄限元方法躁有频攀计算结聚遴彳亍比较,分析了龋舱装载对船体总掇动固有频率豹影响, 提出了隔舱装载影响系数,并将其成用剿近似公式中,绘出了隔舱装载黠船舶爨祷频率韵变纯范潮,方便了入稻程设计阶段选敬焘视和螺旋桨时数,还为人们在船舶航运过程中选辑台适的装载方式提供了参考。
关键词;船舶;阉青频率:隔舱装裁;翦切影响;一缎粱模型;篓维鹚限嚣模型
船舶总握动特性研究
The Study ofHull Vibration Characteristics
Abstract
The demands of ship vibration’S capabflity are at a hi曲pitch with the improvement of economy level and people’S living prediction or correct prediction of hull frequency,serious vibration may OccRr during the course of ship running,which weakens the ship’s voyage and concealment approximate formulas or one dimension beam model was used to predicted the ship’s vibration levet,it is nicely within four nodes,but the precision drops greatly up wards four nodes,for the hull’S shear deformation effected
greatly at hi醢orders。‰results of氆zee dimensions space FEM model calculation has been
proved to be more accurate,but it consumes too much time and money.
Firstiy,13。988 elements of four羹i蚤d争—焉l封El。l菇3、BE叠d涯24、PIPEl6 and鑫lAS5连l of
current finite element analysis soRvcare ANSYS a舱used to simulate a 1 tanker’s
structure and three dimensions㈣e F嚣M model is ,natural
frequency of vertical and horizontal vibration within six nodes i8 ,one
dimension FEM beam model iS used to calculate natural frequency of vertical and horizontal vibration within six nodes