| Summary: | 碩士 === 國防大學理工學院 === 機械工程碩士班 === 102 === In the SCUBA diving equipments, the usage of the first-stage regulators is to reduce the air pressure in the tank from 200bar to 10bar. Divers can breath normally through the second-stage regulators which can supply air with a suitable pressure. From previous studies about SCUBA regulators, some papers simulated the air flow in the second-stage regulators. Some patents provided the improved designs about the regulators in order to have better performance.
This paper constructed a mathematical model for the piston-type first-stage regulator, and perform optimization analysis on this model. First, MATLAB/Simulink software is used on the model simulation. Some parameters in the model are determined by experiments. Finally, three parameters (the piston area, the spring constant, the chamber volume) are used for optimization analysis with “ Design Optimization” tool of MATLAB/Simulink. The objective is to reduce the pressure difference in the chamber.
From the results of the optimization analysis, a smaller piston area, a smaller spring constant, and a larger chamber volume can improve the performance of a regulator in order to make the divers breath more smoothly.
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