由于这一系列的特殊性，采取规范的总强度计算方法难以合理地评估船体强度，且采用舱段模型进行直接计算也存在困难。
Just because of this, it's very hard for us to evaluate the ship structural strength, which based on whole strength calculation method.
作为船体中比较特殊的双曲结构，舰船首部的球鼻首相关的结构试验规范很少。
Three structure tests on bulbous bow of naval ships were conducted:static compressive test, heavy drop test and explosion test.
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