| With the increasing scarcity of land resources, exploration and exploitation of marine resources have gradually become a key point of development strategy worldwide. However, due to the restraints on the technical level of deep-sea equipment, the capability to explore and utilize the marine resources in China is still inadequate. Therefore, China has gradually begun to develop and improve the Deepwater Pressure Environmental Simulation Test Device, aiming at providing an important test environment and development platform for product design and scientific research of deep-sea equipment. The paper based on the external pressure test task for one type of product, developed the Deepwater Pressure Environmental Simulation Test Device composed of Vertical Autoclave and Pressure Control System with Numerical simulation optimization technique and Simulation experiment technique. The main work accomplished and results obtained are listed as follows:(1) With the aid of the finite element method, the integral structure of the Vertical Autoclave was designed and optimized. Based on the technical requirements, the overall structure of Vertical Autoclave was determined, and by preliminary design the main structural dimensions of the Autoclave was obtained and the components of materials was determined. Under the premise of satisfying the strength requirement, the stiffness constraint condition based on leakage failure was proposed, with which the lightweight design of of Vertical Autoclave was completed; Meanwhile, the optimization design variables related to the fatigue structure were selected by the sensitivity analysis, and through analyzing the calculation results of the sample space and the response curve of the variables, the optimization analysis of the fatigue structure of the Autoclave was completed.(2) Based on the research of the structure and material of the sealing ring, the sealing structure of the Vertical Autoclave was developed. According to the characteristics of rubber material, the suitable superelastic constitutive model was selected, and the performance of O type, square type, single labiate type, Y type sealing ring in the pre-tightening and self-tightening process was analyzed and compared from the strength, self-sealing effect, service life and so on; Meanwhile, based on the structure of single labiate type seal ring, the strength of materials, compression rate, weatherability of the nitrile rubber, fluorine rubber, silicone rubber were compared, and the sealing performance parameters of the sealing ring with different hardness conditions were analyzed, then determining the rubber material and the material hardness range of the sealing ring which is suitable for the Vertical Autoclave; In addition, the effects of sealing gap and sealing groove width on the sealing performance of single labiate type seal were analyzed, and the optimum size range of Vertical Autoclave sealing groove was obtained.(3) According to the fuzzy control theory, a High-accuracy Pressure Control System based on fuzzy adaptive PID control was developed by using the method of MATLAB-AMESim co-simulation experiment. In accordance with the technical index of the Pressure Control System of the Vertical Autoclave, the control principle and structure of the system were determined, and the design and selection of the system hardware were completed by engineering calculation; Meanwhile, the results of batch processing of Pressure Control System were obtained with MATLAB-AMESim co-simulation platform, combined with the general rules of PID regulation, thus establishing the fuzzy control rules for this system, and through the co-simulation experiment, the dynamic and static characteristics of conventional PID and fuzzy PID controller with different signal response were compared and analyzed, verifying the control effect of the fuzzy PID controller on the High-accuracy Pressure Control System, and then the research and development of the fuzzy PID controller was completed. |
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