本文關(guān)鍵詞： 超磁致伸縮 水壓傳動(dòng) 伺服閥 CFD 有限元法　出處：《北京工業(yè)大學(xué)》2011年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：超磁致伸縮材料(GMM)是一種具有應(yīng)變大、響應(yīng)速度快、能量傳輸密度高、輸出力大等優(yōu)異性能的新型功能材料�；诔胖律炜s驅(qū)動(dòng)器(GMA),提出了一種新型的雙相對(duì)置超磁致伸縮自傳感驅(qū)動(dòng)水壓伺服控制閥,并以此為研究對(duì)象,采用了計(jì)算流體力學(xué)(CFD)、有限元法(FEM)以及自動(dòng)控制系統(tǒng)MATLAB動(dòng)態(tài)仿真等方法,對(duì)所設(shè)計(jì)的雙相對(duì)置超磁致伸縮自傳感驅(qū)動(dòng)水壓伺服閥進(jìn)行了系統(tǒng)、深入的分析和研究。 基于流體力學(xué)中管道流動(dòng)和各種典型節(jié)流口流動(dòng)理論,對(duì)超磁致伸縮水壓伺服閥的液壓橋路進(jìn)行了理論分析,建立了液壓橋路簡(jiǎn)化模型和閥芯兩端壓差與擋板位移之間的關(guān)系式,驗(yàn)證了后續(xù)仿真分析結(jié)果的正確性。利用CFD穩(wěn)態(tài)流技術(shù)研究了擋板和噴嘴前端面的壓力分布,以及閥芯兩端壓差隨著擋板位置的變化情況。 利用CFD動(dòng)網(wǎng)格技術(shù)建立了滑閥啟閉過(guò)程的動(dòng)態(tài)計(jì)算模型,節(jié)流口的大小變化通過(guò)FLUENT軟件中的UDF函數(shù)來(lái)定義,研究了開(kāi)口量逐步減小過(guò)程中流場(chǎng)的分布情況。對(duì)兩種不同結(jié)構(gòu)型式的滑閥進(jìn)行了CFD動(dòng)網(wǎng)格分析,結(jié)果表明帶有環(huán)形槽的滑閥產(chǎn)生了較小的穩(wěn)態(tài)液動(dòng)力。利用CFD穩(wěn)態(tài)流技術(shù)計(jì)算得到滑閥閥芯的徑向不平衡力。結(jié)果表明,徑向不平衡力遠(yuǎn)遠(yuǎn)小于靜壓支撐力,閥芯可很好的懸浮于閥套內(nèi)。 利用ABAQUS軟件的ABAQUS/Standard模塊對(duì)噴嘴頭和噴嘴塊的過(guò)盈配合進(jìn)行了仿真分析,比較了不同溫度下接觸力的變化情況。仿真表明,由于溫度的升高和材料的線(xiàn)膨脹效應(yīng),接觸應(yīng)力會(huì)發(fā)生變化,但是總體來(lái)說(shuō)接觸應(yīng)力變化不大,噴嘴頭和噴嘴塊能保持很好的接觸。 對(duì)水壓伺服閥的反饋桿-滑閥組件的穩(wěn)定狀態(tài)進(jìn)行了力學(xué)分析,提出了伺服閥穩(wěn)態(tài)分析的有限元計(jì)算模型。計(jì)算得到了不同反饋桿配置下水壓伺服閥滑閥的位移輸出,可用于指導(dǎo)設(shè)計(jì)出合適粗細(xì)的反饋桿。 提出了雙相對(duì)置超磁致伸縮驅(qū)動(dòng)器的等效動(dòng)力學(xué)模型,并由此得到了磁致伸縮水壓伺服閥的物理傳遞模型。利用自動(dòng)控制系統(tǒng)MATLAB動(dòng)態(tài)仿真方法對(duì)該伺服閥的物理模型進(jìn)行了仿真。結(jié)果表明,該閥的響應(yīng)時(shí)間為0.016s,幅頻寬為60Hz,相頻寬為50Hz,能夠滿(mǎn)足快速響應(yīng)的要求。
[Abstract]:Giant Magnetostrictive material (GMMM) is a kind of material with large strain, high response speed and high energy transfer density. Based on giant magnetostrictive actuator (GMA), a new type of double relative giant magnetostrictive self-sensing drive hydraulic servo control valve is proposed. By using the methods of computational fluid dynamics (CFD), finite element method (FEM) and dynamic simulation of automatic control system (MATLAB), the design of double relative giant magnetostrictive self-sensing driven hydraulic servo valve is systematically analyzed and studied. Based on the theory of pipe flow and various typical throttle flow in hydrodynamics, the hydraulic bridge of giant magnetostrictive hydraulic servo valve is analyzed theoretically. The simplified model of hydraulic bridge and the relationship between the pressure difference between the two ends of the valve core and the displacement of the baffle are established to verify the correctness of the subsequent simulation results. The pressure distribution of the baffle and the front end of the nozzle is studied by using the CFD steady flow technique. And the pressure difference between the two ends of the valve core with the change of baffle position. The dynamic calculation model of sliding valve opening and closing process is established by using CFD dynamic grid technology. The change of throttle port is defined by UDF function in FLUENT software. The distribution of the flow field in the process of gradual decrease of the opening is studied. The CFD dynamic grid analysis of two kinds of sliding valves with different structures is carried out. The results show that the sliding valve with annular grooves produces small steady fluid power. The radial unbalance force of the valve core is calculated by using CFD steady state flow technique. The results show that the radial unbalance force is much smaller than the static pressure supporting force. The valve core is well suspended in the valve sleeve. The interference fit between nozzle head and nozzle block is simulated and analyzed by using ABAQUS/Standard module of ABAQUS software, and the change of contact force at different temperature is compared. The simulation results show that due to the increase of temperature and the linear expansion effect of material, The contact stress will change, but the contact stress will not change, and the nozzle head and nozzle block can keep in good contact. In this paper, the stable state of feedback rod and slide valve assembly of hydraulic servo valve is analyzed, and the finite element calculation model of steady state analysis of servo valve is put forward. The displacement output of slide valve of hydraulic servo valve with different feedback rod configuration is calculated. Can be used to guide the design of the appropriate thickness of the feedback rod. An equivalent dynamic model of double relative giant magnetostrictive actuator is presented. The physical transfer model of the magnetostrictive hydraulic servo valve is obtained. The physical model of the servo valve is simulated by using the automatic control system MATLAB dynamic simulation method. The response time of the valve is 0.016 s, the amplitude width is 60 Hz, and the phase width is 50 Hz, which can meet the requirement of rapid response.
【學(xué)位授予單位】：北京工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2011
【分類(lèi)號(hào)】：TH137.52

【引證文獻(xiàn)】

相關(guān)碩士學(xué)位論文 前1條

1 王麗梅;埋地長(zhǎng)輸管道泄漏事故應(yīng)急關(guān)鍵技術(shù)研究[D];北京工業(yè)大學(xué);2012年

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本文編號(hào)：1511344