雙噴嘴擋板伺服閥流場分析及其動靜態(tài)特性研究
發(fā)布時間：2019-02-12 11:02
【摘要】：液壓元件、系統(tǒng)及其控制,是世界上工業(yè)發(fā)達(dá)國家爭相競爭發(fā)展的產(chǎn)業(yè),并且被認(rèn)為是衡量一個國家工業(yè)化水平高低的重要標(biāo)志。我國液壓工業(yè)在借鑒外國技術(shù)的基礎(chǔ)上發(fā)展起來,得到了較大成就。然而我國液壓工業(yè)發(fā)展存在著一定的問題,例如內(nèi)部流道能量損失大、噪聲大、壽命較短、對于液壓閥及管路的設(shè)計較少應(yīng)用有限元分析,通常是根據(jù)經(jīng)驗設(shè)計,因此,根據(jù)CFD這一現(xiàn)代化的數(shù)值計算工具分析液壓元件和管路內(nèi)的流場,并根據(jù)結(jié)果分析流場結(jié)構(gòu)和液壓閥的噪聲、能量損失之間的關(guān)系是非常必要的。 對雙噴嘴擋板伺服閥的噴嘴擋板級和主閥芯流場進(jìn)行模擬分析、試驗檢驗擋板閥的靜態(tài)、動態(tài)特性是本文的主要工作。論文首先介紹了計算流體力學(xué)的相關(guān)內(nèi)容,包括了計算流體力學(xué)的求解步驟和主要的計算方法、流體運(yùn)動模型和紊流模型和FLUENT的簡單介紹,對于計算流體力學(xué)有了初步認(rèn)識。然后用INVENTER軟件建立了雙噴嘴擋板伺服閥的噴嘴擋板級和主閥的流場模型,用GAMBIT軟件對其進(jìn)行了網(wǎng)格的劃分。論文建立分析了擋板不同位移和主閥閥芯在不同位置流場形狀時候的流場形狀,分析了對液壓閥可能產(chǎn)生的影響。得到了在噴嘴擋板的位置能量耗散較大,并且速度有較大變化,同時溫度在此處有較大提升的結(jié)論,在主閥極流場分析中得到在閥口開啟的時候,液流速度會產(chǎn)生較大變化,壓力在此處變化也較大,能量耗散集中在此處,同時針對主閥芯做出一些改進(jìn),分析了改進(jìn)后主閥級流場形狀,并且與未改進(jìn)之前的流場進(jìn)行了比較,得出改進(jìn)后的閥芯在流體進(jìn)入閥腔的時候,速度及壓力變化顯著減小。 論文介紹了伺服閥的分類、工作原理和動靜態(tài)性能指標(biāo)參數(shù)。并且建立了伺服閥的數(shù)學(xué)模型,通過MATLAB對其動靜態(tài)性能進(jìn)行了仿真分析,通過實驗得到了噴嘴擋板閥的內(nèi)泄漏、空載流量曲線、壓力特性曲線、分辨率等一系列的靜態(tài)特性曲線,最后進(jìn)行了雙噴嘴擋板伺服閥的動態(tài)性能測試,通過時域和頻域的響應(yīng)曲線得到了伺服閥的幅頻寬和相頻寬,并且得到了其頻率范圍。
[Abstract]:Hydraulic components, systems and their control are the competitive industries of the developed countries in the world, and are regarded as an important symbol to measure the industrialization level of a country. The hydraulic industry of our country has developed on the basis of foreign technology, and has made great achievements. However, there are some problems in the development of hydraulic industry in China, such as large energy loss of internal runner, large noise, short life, less application of finite element analysis to the design of hydraulic valves and pipes, usually based on experience, so, It is necessary to analyze the flow field in hydraulic components and pipes according to CFD, a modern numerical calculation tool, and to analyze the relationship between the flow field structure and the noise and energy loss of hydraulic valves according to the results. The flow field of the nozzle baffle and the main valve core of the double nozzle baffle servo valve is simulated and analyzed. The static and dynamic characteristics of the baffle valve are tested and the main work of this paper is to test the static and dynamic characteristics of the baffle valve. This paper first introduces the relevant contents of computational fluid dynamics, including the solving steps and main calculation methods of computational fluid dynamics, the simple introduction of fluid motion model, turbulence model and FLUENT, and has a preliminary understanding of computational fluid mechanics. Then the flow field model of the double nozzle baffle servo valve and the main valve is established by using INVENTER software, and the mesh is divided by GAMBIT software. In this paper, the flow field shape of different displacement of baffle and main valve core in different position flow field shape is analyzed, and the possible influence on hydraulic valve is analyzed. The results show that the energy dissipation at the nozzle baffle is larger, and the velocity varies greatly, and the temperature is greatly raised here. In the analysis of the flow field of the main valve pole, the liquid flow velocity will change greatly when the valve is opened. The pressure changes greatly here, and the energy dissipation is concentrated here. At the same time, some improvements are made for the main valve core, and the shape of the improved main valve stage flow field is analyzed and compared with the flow field before the improvement. It is concluded that when the fluid enters the valve chamber, the change of velocity and pressure decreases significantly. This paper introduces the classification, working principle and dynamic and static performance parameters of servo valve. The mathematical model of the servo valve is established, and the dynamic and static performance of the valve is simulated by MATLAB. The internal leakage, the empty load flow curve and the pressure characteristic curve of the nozzle baffle valve are obtained by experiments. Finally, the dynamic performance of the double nozzle baffle servo valve is tested. The amplitude-frequency width and phase frequency width of the servo valve are obtained by the response curves in time domain and frequency domain, and the frequency range of the servo valve is obtained.
【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2011
【分類號】：TH137.52
[Abstract]:Hydraulic components, systems and their control are the competitive industries of the developed countries in the world, and are regarded as an important symbol to measure the industrialization level of a country. The hydraulic industry of our country has developed on the basis of foreign technology, and has made great achievements. However, there are some problems in the development of hydraulic industry in China, such as large energy loss of internal runner, large noise, short life, less application of finite element analysis to the design of hydraulic valves and pipes, usually based on experience, so, It is necessary to analyze the flow field in hydraulic components and pipes according to CFD, a modern numerical calculation tool, and to analyze the relationship between the flow field structure and the noise and energy loss of hydraulic valves according to the results. The flow field of the nozzle baffle and the main valve core of the double nozzle baffle servo valve is simulated and analyzed. The static and dynamic characteristics of the baffle valve are tested and the main work of this paper is to test the static and dynamic characteristics of the baffle valve. This paper first introduces the relevant contents of computational fluid dynamics, including the solving steps and main calculation methods of computational fluid dynamics, the simple introduction of fluid motion model, turbulence model and FLUENT, and has a preliminary understanding of computational fluid mechanics. Then the flow field model of the double nozzle baffle servo valve and the main valve is established by using INVENTER software, and the mesh is divided by GAMBIT software. In this paper, the flow field shape of different displacement of baffle and main valve core in different position flow field shape is analyzed, and the possible influence on hydraulic valve is analyzed. The results show that the energy dissipation at the nozzle baffle is larger, and the velocity varies greatly, and the temperature is greatly raised here. In the analysis of the flow field of the main valve pole, the liquid flow velocity will change greatly when the valve is opened. The pressure changes greatly here, and the energy dissipation is concentrated here. At the same time, some improvements are made for the main valve core, and the shape of the improved main valve stage flow field is analyzed and compared with the flow field before the improvement. It is concluded that when the fluid enters the valve chamber, the change of velocity and pressure decreases significantly. This paper introduces the classification, working principle and dynamic and static performance parameters of servo valve. The mathematical model of the servo valve is established, and the dynamic and static performance of the valve is simulated by MATLAB. The internal leakage, the empty load flow curve and the pressure characteristic curve of the nozzle baffle valve are obtained by experiments. Finally, the dynamic performance of the double nozzle baffle servo valve is tested. The amplitude-frequency width and phase frequency width of the servo valve are obtained by the response curves in time domain and frequency domain, and the frequency range of the servo valve is obtained.
【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2011
【分類號】：TH137.52
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