基于Fluent软件的伺服液压缸静压支承密封流场仿真
[Abstract]:As the executive component of the hydraulic servo system, the performance of the servo hydraulic cylinder directly affects the control precision and the dynamic and static quality of the system. It is quite different from the ordinary hydraulic cylinder, and it needs to have less friction and excellent guiding performance. In order to meet the high-frequency heavy load and bias requirements. Therefore, it is very important to adopt suitable sealing and guiding mode for servo hydraulic cylinder. In this paper, based on the dynamic response test hydraulic vibration system of track subgrade, a novel two-stage servo hydraulic cylinder with novel structure is designed in order to make it have less friction force and better guiding performance. The end of piston rod is sealed by hydrostatic bearing. Firstly, the static pressure bearing seal flow field is modeled and meshed by Pro/e and Gambit software. Then, the static pressure bearing seal flow field is simulated with Fluent software, and the pressure and velocity distribution, as well as the influence of piston rod velocity on the flow field velocity and outlet leakage amount are analyzed. At the same time, the relationship between friction force and running speed of piston rod in hydrostatic bearing seal is studied. Finally, the effects of piston rod velocity, input flow rate and eccentricity on the radial bearing capacity of hydrostatic bearing seal are studied. The simulation results show that the friction force of static pressure support is small. When the piston rod is subjected to radial bias load, the radial support force can be provided, and the vibration frequency and positioning accuracy of servo hydraulic cylinder can be improved.
【学位授予单位】:武汉科技大学
【学位级别】:硕士
【学位授予年份】:2012
【分类号】:TH137.51
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