本文選題：水壓傳動(dòng) + 先導(dǎo)式水壓溢流閥�。� 參考：《昆明理工大學(xué)》2012年碩士論文

【摘要】：水壓傳動(dòng)以其無污染、阻燃性好、經(jīng)濟(jì)性好、來源廣泛等優(yōu)點(diǎn)成為流體傳動(dòng)與控制的重要研究方向之一。其中,水壓壓力控制閥是水壓傳動(dòng)系統(tǒng)的重要元件之一。傳統(tǒng)的壓力控制閥都是有差閥,定壓精度較低且水壓傳動(dòng)存在泄漏大、潤滑性差、易腐蝕等缺陷。因此,研究如何提高水壓壓力閥的性能具有重要的理論和實(shí)際工程價(jià)值。 論文首先介紹了水壓傳動(dòng)技術(shù)的發(fā)展歷程,優(yōu)缺點(diǎn)及國內(nèi)外的研究現(xiàn)狀。以先導(dǎo)式水壓溢流閥為研究對(duì)象,從理論上分析了此類閥產(chǎn)生靜差的原因,得出了主要是由于進(jìn)口的壓力值會(huì)隨流量的變化而變化所導(dǎo)致的結(jié)論；建立了溢流閥精確的數(shù)學(xué)模型,推導(dǎo)出流量—壓差公式,提出無靜差溢流閥的設(shè)計(jì)要求,即：靜差值δ≤0.2%。 依據(jù)水的特殊理化特性,在研究其氣蝕、噪聲問題的基礎(chǔ)上,設(shè)計(jì)了一種無靜差先導(dǎo)式水壓溢流閥的新結(jié)構(gòu),借助一種微型壓力傳感器直接檢測主閥進(jìn)口受控壓力,并采用閉環(huán)內(nèi)反饋控制及動(dòng)壓反饋控制來消除靜差。建立了先導(dǎo)閥及主閥流場的CFD模型,用Fluent軟件進(jìn)行了仿真分析,驗(yàn)證了主閥設(shè)計(jì)的合理性。介紹了超磁致伸縮材料(GMM)的優(yōu)缺點(diǎn)及工作原理,設(shè)計(jì)了一種適合驅(qū)動(dòng)先導(dǎo)閥的智能驅(qū)動(dòng)器—超磁致伸縮驅(qū)動(dòng)器(GMA),并建立了其數(shù)學(xué)模型,研究了其動(dòng)靜態(tài)特性。建立了新型先導(dǎo)式無靜差水壓溢流閥的動(dòng)靜態(tài)數(shù)學(xué)模型并研究其動(dòng)靜態(tài)特性及穩(wěn)定性。 通過計(jì)算及仿真分析可知,設(shè)計(jì)的無靜差先導(dǎo)式水壓溢流閥的靜差值δ=0.16%,已達(dá)到設(shè)計(jì)要求。流場CFD分析驗(yàn)證了設(shè)計(jì)的無靜差溢流閥結(jié)構(gòu)的合理性,有效的防止了閥口氣蝕、噪聲的產(chǎn)生。GMA響應(yīng)速度非�？�,為毫秒級(jí),最大輸出位移為0.6mm,滿足先導(dǎo)閥芯的最大輸出位移要求。無靜差溢流閥有很好的控制特性及穩(wěn)壓特性,頻寬較高,幅頻寬為86Hz、相頻寬為87.6Hz,穩(wěn)定性好,12ms達(dá)到穩(wěn)定。
[Abstract]:Water hydraulic transmission has become one of the important research directions of fluid transmission and control because of its advantages of no pollution, good flame retardancy, good economy and wide source. Among them, hydraulic pressure control valve is one of the important components of hydraulic transmission system. The traditional pressure control valves are all differential valves with low accuracy of fixed pressure and large leakage, poor lubricity and easy corrosion in hydraulic transmission. Therefore, it is of great theoretical and practical value to study how to improve the performance of hydraulic pressure valve. Firstly, the paper introduces the development course, advantages and disadvantages of hydraulic transmission technology and the research status at home and abroad. Taking the pilot hydraulic relief valve as the research object, this paper theoretically analyzes the causes of the static difference of this kind of valve, and draws the conclusion that the pressure value of the inlet will change with the flow rate. The accurate mathematical model of relief valve is established, the formula of flow-pressure difference is deduced, and the design requirement of relief valve without static difference is put forward, that is, the value of static difference 未 鈮，

本文編號(hào)：1803464