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A study on the pressure vessel design, structural analysis and pressure test of a 6000 m depth-rated unmanned underwater vehicle

机译：某6000 m深度无人水下航行器压力容器设计，结构分析及压力试验研究

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摘要

MOERI-KORDI (Maritime and Ocean Engineering Research Institute-Korea Ocean Research and Development Institute) has conducted the development of an unmanned underwater vehicle (UUV) for 6000 m deep-sea exploration, which was completed in 2006. Several pressure vessels were mounted on the UUV frame for loading electric and electronic equipment. The pressure vessels were constructed with titanium alloy 1V6A1-4V for two main cylindrical canisters and with aluminium alloy A16061-T6 for several hemispherical housings of electric motor drivers, respectively. This article presents the design process of the pressure vessels and experimental results acquired by high-pressure tests, which were conducted with the cooperation between MOERI-KRISO and Japan Agency for Marine-Earth Science and Technology (JAMSTEC). The pressure vessels were designed on the basis of the buckling analysis as well as structural yielding analysis, and checked the safety by the finite-element analysis (FEA) and analytical (empirical) formula. Moreover, by structural reliability analysis, the cylindrical part and the end plates of the main pressure vessels made of Ti-6A1-4V were designed with a safety of 99.98% under circumstance of 75 MPa. The pressure housings made of A16061-T6 were also designed by the same procedure. Pressure test was performed with the large high-pressure environment simulation unit of JAMSTEC. The pressure vessels made of the titanium-aluminium alloy were safe even when they were under pressure of 75.46 MPa. Test results show that there are less than 5% difference between the FEA and the high-pressure tests. In this research, the pressure test was conducted up to 75 MPa, which corresponds with a safety factor of 1.25. Even though this is lower than the usual safety factor of 1.5-2.5, this study shows that the pressure vessels are safe if we consider the reliability analysis.
机译：MOERI-KORDI（海事与海洋工程研究所-韩国海洋研究与开发研究所）已进行了用于6000 m深海勘探的无人水下航行器（UUV）的开发，该水下航行器于2006年完成。用于装载电气和电子设备的UUV框架。压力容器分别由用于两个主圆柱罐的钛合金1V6A1-4V和由铝合金A16061-T6制造的电动马达驱动器的几个半球形外壳构成。本文介绍了压力容器的设计过程和通过高压测试获得的实验结果，这些实验是在MOERI-KRISO和日本海洋地球科学技术局（JAMSTEC）的合作下进行的。在屈曲分析和结构屈服分析的基础上设计压力容器，并通过有限元分析（FEA）和分析（经验）公式检查安全性。此外，通过结构可靠性分析，设计了由Ti-6A1-4V制成的主压力容器的圆柱形部分和端板，在75 MPa的情况下安全性为99.98％。由A16061-T6制成的压力外壳也通过相同的程序设计。使用JAMSTEC的大型高压环境模拟单元进行了压力测试。由钛铝合金制成的压力容器即使在75.46 MPa的压力下也很安全。测试结果表明，FEA和高压测试之间的差异小于5％。在这项研究中，进行了高达75 MPa的压力测试，相当于1.25的安全系数。尽管这低于通常的1.5-2.5安全系数，但这项研究表明，如果考虑可靠性分析，压力容器是安全的。

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