LNG船运动响应数值计算与试验研究

随着能源需求的增加和人们环保意识的增强，天然气作为一种清洁能源越来越受到青睐。对于液化天然气的海上长距离运输， LNG船无疑是最有效、最经济的选择。耐波性作为船舶安全性能的一个重要指标，在船舶的设计和运营过程中必须考虑。本文采用挪威船级社 SESAM软件计算了 LNG船在规则波中的六自由度运动响应，研究航速和浪向对其运动的影响。根据相关要求制作船模进行其在规则波中的耐波性试验，并将计算结果跟试验结果进行对比。结果表明：浪向对其运动响应影响较大，横浪时升沉、横摇响应最大，迎浪时纵摇响应最大；计算结果与试验结果的变化规律吻合较好。

Numerical and experimental study of LNG ship motion response

With increasing demand for energy and the enhancement of environment consciousness, the natural gas as a clean energy has drawn more and more attention. For long-distance offshore transportation of liquefied natural gas, undoubtedly, LNG vessel is the most effective and economical choice. Seakeeping performance as an important indicator of the safety performance of the ship, it should be taken into account during the progress of designing and operating. In present paper, the soft SESAM of DNV is used to calculate the six degree motion response of LNG ship in regular waves, studying the influence of forward speed and wave direction. According to relevant requirement, ship model is made and its seakeeping experiment is conducted, and then compared the calculated result with the experiment result. The results showed that: the wave direction has great influence on its motion response, heave and roll is the largest when encountering transverse wave, while pitch is the largest at the case of head sea; the variation trend of calculated result and experiment result has a good agreement.