本文選題：動圈式電液伺服閥 + U型4孔全橋�。� 參考：《武漢科技大學》2011年碩士論文

【摘要】：電液伺服閥是電液伺服控制系統(tǒng)中的主要元件,在諸多領(lǐng)域中都有著廣泛的應用。國內(nèi)外許多學者對動圈式電液伺服閥都有著不少研究,但是大多局限在定常或者簡單閥門的研究上。本文采用FLUENT軟件,對動圈式電液伺服閥的某些局部流場進行仿真與研究。 流體的仿真,其理論基礎(chǔ)是諸如牛頓內(nèi)摩擦定律等流體力學理論。我們根據(jù)伺服閥的結(jié)構(gòu)對其橋路結(jié)構(gòu)提出了改進方案,并進行仿真加以驗證。然后我們對主閥芯和先導閥芯分別進行了靜態(tài)和動態(tài)仿真。 結(jié)果表明,使用串聯(lián)節(jié)流孔的4孔U型全橋形式不僅能夠更好的完成阻尼作用,而且還明顯增強了閥的抗污染能力。仿真能夠良好地表現(xiàn)出閥體內(nèi)部流場的變化情況。我們不僅能夠通過仿真數(shù)據(jù)提出優(yōu)化方案,也能夠運用仿真來驗證優(yōu)化方案的效果。尤其是先導閥芯的動態(tài)仿真,為以后的仿真提出了新的思維方法。尤其是在閥口大小不斷變化等類似情況流場的分析中,動態(tài)仿真的結(jié)果更加接近實際情況。
[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.
【學位授予單位】：武漢科技大學
【學位級別】：碩士
【學位授予年份】：2011
【分類號】：TH137.52

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