| The sea covers 71% of the earth’s surface, and a lot of the earth’s resources are stored under the sea. With the decrease of land resources, people began to march to the sea, the development and utilization of marine resources, can be very good to ease the growing population and the lack of resources arising from the growing contradiction,and guarantee the healthy development of national economy.More advanced marine detection equipment can be dived deeper and complete a variety of difficult job at sea to exploit the marine resources.Therefore, it is necessary to design a more advanced deep-sea manned submersible, which requires a lot of advanced materials, advanced technology and advanced technology.However, That the whole equipment has to be a very high safety and reliability is the very important prerequisite for the submarine to successfully complete the task.The opening structure is divided into two types: one is for the research staff and the watertight doors,the other is for the observation of the observation window. Bathyscaphs observation window is made of organic glass called PMMA and window seat is made of titanium alloy. The main research object of this thesis is mechanical property of Deep-sea Manned Submersible under the action of pressure circumstance.Not only the stress and axial displacement of observation window, deformation of organic glass are focused,but also the contact stress,friction stress and creep between the observation window and organic glass are cared.To ensure observation window structure safe and reliable in working process, modal experiment was carried out.In order to study the deformation characteristics of organic glass under the static load,observation window is studied as main research subject, which is one of the important open structures of the deep sea manned submersible. With simulation of the observation window under different pressures in finite element software, the friction coefficient and axial displacement are discussed which occur on the contact surface and symmetry axis.So the deformation law of the organic glass in the observation window is found. Compared different coefficient setting of friction on the contact surface, the appropriate modeling method is selected.Then, different friction coefficient is set up to study the influence of different friction coefficient on the mechanical properties.Submersible observation window materials are organic glass.The performance oforganic glass is different from metal, and will produce creep deformation under the action of high pressure in the water. This kind of deformation is related to the size of the external load, the time of compression, the characteristics of the material itself and so on.This paper discussed influence of creep on the observation window with finite element simulation.Compared with the results obtained and the literature experimental data, the results are in perfect agreement.The software of finite element method is also used to the analysis of the feasibility of the creep of organic glass.At the bottom of the seabed for scientific research work,the engine produces vibration.The engine operating frequency may cause the resonance of the submersible, deformation caused by the pressure hull and the observation window may destroy the seal, there is a serious safety hazard.By using the finite element software, the modal analysis is carried out, and the natural frequency is obtained, so that the engine operating frequency is avoided and the safety and reliability of the deep-sea submersible is improved.Based on the analysis of deep-sea manned submersible part, the conclusion and the use of finite element method of submersible design has certain reference significance. |
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