http://www.naoe.eng.osaka-u.ac.jp/naoe/naoe1/image/Reference03.pdf

Review of hydroelasticity theories for global response of marine structures

An overview of buckling and ultimate strength of spherical pressure hull under external pressure

Deep sea exploration and exploitation are of increasing interest to 21st century scientists, and both manned and unmanned deep submergence vehicles are necessary means for deep sea exploration. To fulfill the requirements of deep sea exploration for China Ocean Mineral Resources R&D Association (COMRA), a deep manned submersible was in the process of development in China from 2002 to 2012 and was named Jiaolong in 2010. The purpose of this paper is to introduce the development process from a historical point of view, including the design, realization of components, assembly, open-water tank test, and sea trials of the Jiaolong deep manned submersible. The technical difficulties encountered at each stage and, their solutions, are briefly described. The future development trends for deep manned submersibles are pointed out.

Development of the Jiaolong Deep Manned Submersible

Hydroelastic analysis of a flexible mat-shaped floating breakwater under oblique wave action

Investigation on egg-shaped pressure hulls

A brief description of current available design rules for spherical pressure hull of deep manned submersibles is provided,and the common foundation of these rules is found to be either the classical yielding load formula or critical elastic buckling load formulaThen these rules are used to calculate the shell thickness of the spherical pressure hulls of several existing submersiblesThe calculation results are compared after the unification of input parameters of all design rulesAccording to this comparison,it is found that there is significant difference among the calculation results of these rules and the design thickness calculated by most rules is much larger than the actual design thickness of existing pressure hullsThus it is appealed to be urgent and necessary to update and unify current design rulesFinally,the process of establishing the new design rule is proposed

A Comparison of Different Rules for the Spherical Pressure Hull of Deep Manned Submersibles

Most of present researches on the submersibles pressure hulls are based on thin shell theory,but pressure spherical shells of deep-sea manned submersibles are indeed thick shells.Currently there is no analytical solution about thick spherical hulls under uniform pressure,only American Navy Taylor Model Basin formula and Russian formula are available.In this paper,finite element (FE) method is used to study the ultimate strength of pressure spherical hulls in deep-sea manned submersibles.By comparing various FE parameters, a validated model was established.Using this model,the calculation result is found to be in agreement with the experiment result, while the two formulas' results are on the lower side. Then the ultimate strength of pressure spherical hulls under different thickness-radius ratio is studied,as well as the effect of the initial imperfection.As for the deep-sea manned submersibles,the ultimate strength of pressured spherical hulls is recommended to be obtained by FE method.The effect of the initial imperfection to the ultimate strength is not significant when the spherical hull is finely manufactured.For the convenience of application, the relationships between the ultimate strength of the perfect spherical hull and that with imperfection are provided.

Ultimate strength of pressure spherical hull in deep-sea manned submersibles

A procedure of Multidisciplinary Design Optimization (MDO) is applied to design of a submarine system which is large and complex enough to require that the design problem be decomposed to a set of tractable design problems carried out by disciplinary specialistsA multidisciplinary decomposition and Analyses were developed for this complex system that includes hydrodynamics, propulsion, weight, performance and cost The collaborative optimization (CO) architecture is selected to conduct the preliminary conceptual design of submarineThis approach was able to identify feasible designs with the basic construction cost reductions relative to baseline designThe results also demonstrate MDO approaches more suitable for design of the submarine and more flexible and advanced compared with the traditional design approach

Application of Multidisciplinary Design Optimization in the Conceptual Design of a Submarine

The plastic zone size of the crack tip is relative to three dimensional constraint which depends upon not only the plate thickness but also the load and the material property.That means it would have great limitation in applications when simply classifying a plate to planestress or planestrain according to its thickness.There is no acknowledged fomulae in precisely calculating the plastic zone size when three dimensional effect has to be considered.In this paper,three dimensional plastic zone size in the vicinity of a crack in a center through-cracked plate was investigated using the finite element tool,taking the influence of plate thickness and hardening exponent and yield strength and Poisson's ratio into account.An unique expression was given after comparing the FE results with the theoretical predictions under plane stress and plane strain conditions.

Three dimensional FE analysis of the plastic zone size near the crack tip

Development of the deep manned submersible,"JIAOLONG",is one of the key projects of the national "863" high technology program.Its target is to build a practical product to carry out the predefined missions.Sea trial is the last stage of the development program with higher risks.In the periods from August to October 2009,from May to July 2010 and from July to August 2011,the 1000m,3000m and 5000m depth class tests were successfully finished respectively.Main purpose of this paper is to introduce the results of 7000m depth class test which was just carried out from June 3 to July 16,2012 and successfully completed.The contents include a description of basic information on the sea trials,technological and scientific achievements made in the tests,main faults in operation and dispose measure and their implications to future application.Finally,some conclusions are drawn from this sea trial.

7000m sea trials test of the deep manned submersible “JIAOLONG”

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