动圈式伺服阀流场的分析与仿真研究

发布时间：2018-05-06 17:16

本文选题：动圈式电液伺服阀 + U型4孔全桥　；参考：《武汉科技大学》2011年硕士论文

【摘要】：电液伺服阀是电液伺服控制系统中的主要元件,在诸多领域中都有着广泛的应用。国内外许多学者对动圈式电液伺服阀都有着不少研究,但是大多局限在定常或者简单阀门的研究上。本文采用FLUENT软件,对动圈式电液伺服阀的某些局部流场进行仿真与研究。流体的仿真,其理论基础是诸如牛顿内摩擦定律等流体力学理论。我们根据伺服阀的结构对其桥路结构提出了改进方案,并进行仿真加以验证。然后我们对主阀芯和先导阀芯分别进行了静态和动态仿真。结果表明,使用串联节流孔的4孔U型全桥形式不仅能够更好的完成阻尼作用,而且还明显增强了阀的抗污染能力。仿真能够良好地表现出阀体内部流场的变化情况。我们不仅能够通过仿真数据提出优化方案,也能够运用仿真来验证优化方案的效果。尤其是先导阀芯的动态仿真,为以后的仿真提出了新的思维方法。尤其是在阀口大小不断变化等类似情况流场的分析中,动态仿真的结果更加接近实际情况。
[Abstract]:The electro-hydraulic servo valve is the main component in the electro-hydraulic servo control system and has been widely used in many fields. Many scholars at home and abroad have a lot of research on moving coil electro-hydraulic servo valve, but most of them are confined to the study of steady or simple valve. In this paper, FLUENT software is used to simulate and study some local flow fields of moving coil electro-hydraulic servo valve. Fluid simulation is based on fluid theory such as Newton's law of internal friction. According to the structure of servo valve, we propose an improved scheme of bridge structure, and carry out simulation to verify it. Then we simulated the main spool and pilot spool in static and dynamic state respectively. The results show that the four-hole U-shaped full-bridge with series throttle can not only achieve better damping effect, but also obviously enhance the anti-pollution ability of the valve. The simulation can well show the variation of the flow field inside the valve body. We can not only put forward the optimization scheme through the simulation data, but also use the simulation to verify the effect of the optimization scheme. Especially the dynamic simulation of pilot spool provides a new way of thinking for future simulation. In particular, the dynamic simulation results are closer to the actual situation in the analysis of the flow field in the similar situations, such as the constant change of the valve opening size.
【学位授予单位】：武汉科技大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH137.52

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