Research Of Pressure Core Subsampling And Transfer System

With the development of detection technology in deep sea, it is realized that there are huge resources to uncover under the water. Unlike normal microorganisms, the deep-sea microorganisms have unique characteristics as they live in an extremely high pressure environment. Their special living style and physiological character can be useful in life science, industrial production, gene research and so on. However, most of the deep-sea microorganisms equipment can hardly keep this kind of microbe alive because their inability in pressure maintenance. It is especially difficult when manipulation is needed in this situation at 40MPa. This thesis is aimed at providing with a solution from sediment sampling to microorganisms culturing at in-situ pressure. There have been many reports in sediment sampling or microorganisms culturing in China now. But there are rarely reports explaining how to transfer that sediment from a sampler to a culturing system without pressure loss. So this thesis designed a new type of pressure core subsampling and transfer system based on the lacking of existing solutions at home.This thesis includes six chapters as following.Chapter 1 introduced some background of the deep sea sampling and microorganisms’ research firstly. Then it explained the necessity of sediment transfer system at in-situ pressure by showing the gap between China and foreign countries. At the end of this chapter the research purpose, contents and meaning were put forward.The second chapter discussed rules and target of this study after giving some brief introduction of pressure core sampler and microorganism culturing system. Then it expounded the overall design of the subsampling and transfer system from three aspects:mechanics, hydraulic and electronics.The third chapter conducted some strength calculation of its structure based on mechanical design rules to ensure its safety and stability. And also it used Ansys to analyze some key components of the subsampling and transfer system and optimized the mechanical structure to improve the safety and economy.The forth chapter used ADAMS to analyze the mechanical system after the preceding discusses. It also discussed the necessity of virtual prototyping in design and introduced how to build an appropriate model. With the result of kinematics and dynamic analysis, it was easier to find out some law of this system and determine parameters.The fifth chapter described the hardware platform and electronic platform of a prototype based on the design before. Besides, experimental researches were conducted to check reliability and practically of the pressure core subsampling and transfer system.The sixth chapter gives a brief generalization about all the research work of this thesis and some innovations of the dissertation were summarized. Then it also gave a prospect about further research.