State estimation system and state estimation method for marine liquefied gas tank

A system (1) for estimating the state of a liquefied gas tank (7) provided in a ship (3) is provided with: a measurement means (31) having a measurer (39) for measuring the state related to the strength of the liquefied gas tank (7); a calculation unit (33) that calculates a state related to the strength of the liquefied gas tank (7) using a prior analysis model; a data assimilation unit (35) that updates the prior analysis model by data assimilation using a measurement result acquired by the measurement unit (31); and an evaluation means (37) that evaluates the state of the liquefied gas tank (7) on the basis of the calculation result output from the calculation means (33). 在推断设置于船舶(3)的液化气罐(7)的状态的系统(1)中设置有：测量单元(31)，其具有测量与所述液化气罐(7)的强度相关的状态的测量器(39)；计算单元(33)，其利用事前分析模型来计算与所述液化气罐(7)的强度相关的状态；数据同化单元(35)，其通过使用了所述测量单元(31)所取得的测量结果的数据同化来更新所述事前分析模型；以及评价单元(37)，其根据从所述计算单元(33)输出的计算结果来评价所述液化气罐(7)的状态。