CAJ | 학술논문

船舶轴系校中是轴系可靠性的重要保障。文章在传统校中计算方法的基础上，针对双桨系统提出了一套基于流动分析的改进三弯矩算法。该方法不仅通过流场分析求得螺旋桨伴流场引起的额外载荷，而且同步考虑了轴系在垂向和水平向的二维位移模式。论文将该算法应用到一艘新建LNG船的轴系校中上。从计算结果与传统三弯矩法结果的比较可见，对于双桨系统，两螺旋桨产生的流场会相互影响，在双轴的横向和纵向引起额外的载荷，进而影响轴承在垂向和纵向的实际位移和应力，从而导致传统方法失效。该算例验证了改进算法的有效性，可以进一步防止双桨系统校中的失效问题。
선박축계교중시축계가고성적중요보장。문장재전통교중계산방법적기출상，침대쌍장계통제출료일투기우류동분석적개진삼만구산법。해방법불부통과류장분석구득라선장반류장인기적액외재하，이차동보고필료축계재수향화수평향적이유위이모식。논문장해산법응용도일소신건LNG선적축계교중상。종계산결과여전통삼만구법결과적비교가견，대우쌍장계통，량라선장산생적류장회상호영향，재쌍축적횡향화종향인기액외적재하，진이영향축승재수향화종향적실제위이화응력，종이도치전통방법실효。해산례험증료개진산법적유효성，가이진일보방지쌍장계통교중적실효문제。
Shafting alignment is important to ensure the reliability of shafting system on board. An improved three-moment method based on hydrodynamic simulation is put out. Two-dimensional dis-placements as well as hydrodynamic loads of propellers are taken into consideration to provide bet-ter alignment results for the twin-propulsion systems. The improved method is applied to a newly built LNG ship. The comparison of the results from the tradition and improved methods shows that hydro field generated by both propellers of a twin-propulsion system will interact with each other and provide extra loads besides the gravity of the propeller, which causes extra vertical and hori-zontal displacements on the shafting rather than those from tradition methods. This validates the im-proved methods and helps to prevent reoccurrence of alignment’s failure especially for twin-propul-sion systems.