CAJ | 학술논문

尽管 LNG 船波浪总体载荷的研究在数值方法和模型试验研究方面均有文献可考,但是大型化后的 LNG船其波激振动特性的研究仍不多见,考虑液舱晃荡作用对整体波浪载荷尤其是对波激振动影响的试验研究更为缺乏.在中国船舶科学研究中心耐波性水池和拖曳水池对一艘大型 LNG 船分别进行了两种缩比的模型试验,研究了液舱中液体晃荡和船体刚度变化对总体载荷的影响.试验研究发现了波浪载荷中倍频成分引起的非线性波激振动现象,并且在斜浪中存在类似于垂向波激振动的横向和扭转波激振动.液舱中液体的晃荡总体上减弱了船体的波激振动响应.船体刚度的减小引起船体结构的水弹性效应被急剧放大,从而导致了严重的波激振动现象.最后对本文所述的模型试验进行了不确定度因素分析,并给出了相关结论.
진관 LNG 선파랑총체재하적연구재수치방법화모형시험연구방면균유문헌가고,단시대형화후적 LNG선기파격진동특성적연구잉불다견,고필액창황탕작용대정체파랑재하우기시대파격진동영향적시험연구경위결핍.재중국선박과학연구중심내파성수지화타예수지대일소대형 LNG 선분별진행료량충축비적모형시험,연구료액창중액체황탕화선체강도변화대총체재하적영향.시험연구발현료파랑재하중배빈성분인기적비선성파격진동현상,병차재사랑중존재유사우수향파격진동적횡향화뉴전파격진동.액창중액체적황탕총체상감약료선체적파격진동향응.선체강도적감소인기선체결구적수탄성효응피급극방대,종이도치료엄중적파격진동현상.최후대본문소술적모형시험진행료불학정도인소분석,병급출료상관결론.
Although the investigation of wave loads of LNG carriers by numerical and experimental methods can be found from some references, the available experimental data of springing responses of large LNG carriers seems rare. Up to now, the experimental investigation of sloshing effects to global wave loads, especially the springing responses, is still blank. Experiments for four models of a large LNG carrier with two scales have been conducted in seakeeping and towing tank of china ship scientific research center (CSSRC). The sloshing effects and that from the variation of hull girder stiffness have been studied by these model tests. It can be found from the experimental investigation that the harmonic components in wave loads had induced the springing responses. The similar resonant vibrations such as horizontal and torsional springing responses have also been found in oblique waves. As a whole, sloshing in liquid tank has taken some decreasing influence to springing responses. The hydroelastic effect is drastically enlarged because of the reduction of hull girder stiffness. And consequently, severe springing responses appeared. The uncertain factors in model tests are discussed and some conclusions are recommended in the end of this paper.