本文關鍵詞： 伺服液壓缸 HAGC缸 液壓CAT 試驗方法　出處：《武漢科技大學》2014年博士論文　論文類型：學位論文

【摘要】：HAGC（HydraulicAutomaticGaugeControl）缸廣泛應用于板帶軋機，對其靜、動態(tài)性能進行檢測與判定十分必要。本文針對大型HAGC缸性能測試方法和測試系統進行研究，開展了以下幾個方面的工作： 綜合了國內外HAGC缸使用、制造與測試技術資料，分析了市場需求與技術特點，探討了HAGC缸靜、動態(tài)指標科學測試的理論價值和工程意義。通過對現有HAGC缸測試方法定性及定量分析，針對軋機機架彈性變形、板帶彈塑性變形的復雜工況特點，創(chuàng)新性地提出了能模擬現場工況的加載方法和負載試驗技術，實測表明有較高的測試精度、系統可靠，通用性好。 通過對測試系統關鍵部件--加載機架建立有限元模型，從靜力學和動力學兩方面進行定量仿真分析，并對部分仿真結果進行了測試驗證。仿真分析與實驗結果表明：加載機架上下橫梁中間加工成月牙形，能改善應力分布，使相同載荷下機架總重量較小；4500t載荷作用下，機架強度能滿足HAGC缸測試系統靜態(tài)加載要求，機架高度（Y）方向剛度適中，拉伸量可達5.33mm，在HAGC缸測試過程中能產生較大變形位移量，有利于位移傳感器的測量；機架變形所產生的內摩擦阻尼遠小于HAGC缸的動摩擦力，機架高度方向變形為第4階振型，其固有頻率遠大于HAGC缸測試頻率范圍，機架承受動態(tài)載荷時，位移變形響應速度快，遠大于HAGC缸的動態(tài)測試響應范圍，因此機架的瞬態(tài)過程性能不會對HAGC缸動態(tài)測試結果造成實質性影響。分析了測試系統中電液伺服閥、HAGC缸、連接管道、位移傳感器、伺服控制器 等主要組成元器件，分別建立了數學仿真模型，并在此基礎上形成了測試控制系統的仿真數字模型。按實際選定了仿真參數，運用軟件對液壓位置閉環(huán)控制測試系統進行了仿真分析與PID校正比較，利用開環(huán)Bode圖對穩(wěn)定性進行了分析，通過單位階躍響應及閉環(huán)Bode圖對系統快速性、準確性進行了計算分析。討論了伺服閥與被試液壓缸之間連接管道的剛度、長度、通徑，液壓油的彈性模量、粘度，機架剛度等可變因素對試驗系統測試結果的影響程度，結果表明管道的剛度、長度、通徑對動態(tài)測試結果影響較大，可達基本響應時間的10%以上，機架剛度所致影響可達基本響應時間的4.9%，油液因彈性模量變化所致影響可達基本響應時間的1.7%，其他因素的影響很小，可不予考慮。 開發(fā)了針對大型HAGC缸靜動態(tài)性能檢測的測試系統，，包括液壓系統、電氣控制系統、監(jiān)控程序和畫面、傳感系統、計算機測控及軟件系統。測試系統動態(tài)加載能力達4500t，液壓油源流量1000l/min，壓力31.5MPa，耐壓試驗達70MPa，能方便快捷地完成直徑2200mm以內的HAGC缸的空載起動摩擦力、帶載動摩擦力、帶載頻率特性、帶載階躍響應、空載活塞偏擺等全套靜動態(tài)指標自動檢測任務。 在理論研究和測試驗證基礎上，制定了伺服液壓缸技術條件與試驗方法標準，已經批準為廣東省地方標準:伺服液壓缸第2部分:試驗方法（DB44/T1169.2-2013）。
[Abstract]:HAGC (HydraulicAutomaticGaugeControl) cylinder is widely used in strip mill. It is very necessary to detect and determine its static and dynamic performance. Aiming at the performance test method and test system of large HAGC cylinder, the following aspects are studied.
Comprehensive domestic and international HAGC cylinder, manufacturing and testing technology, analyzes the market demand and technical characteristics, discusses the HAGC cylinder static, dynamic index of scientific testing theoretical value and engineering significance. Based on the existing HAGC cylinder test methods of qualitative and quantitative analysis for rolling mill frame plate with elastic deformation, elastic-plastic deformation the complex working condition, put forward the innovation of the loading method can simulate field conditions and load test technology, test results show that the accuracy, high system reliability, good versatility.
The key components of the test system, loading frame finite element model is established, the quantitative simulation analysis from two aspects of static and dynamic, and some simulation results have been validated. The simulation analysis and experimental results show that the loading rack under the middle of the cross beam processed into crescent, can improve the stress distribution, the total weight of the frame under the same load is small; the load of 4500t, the frame strength can meet the static loading test system of HAGC cylinder, the height of the frame (Y) direction of moderate rigidity and tensile capacity of up to 5.33mm, can produce larger deformation displacement in HAGC cylinder in the process of testing, measurement for displacement sensor; the dynamic internal friction the friction damping is much smaller than that of HAGC cylinder frame deformation, height direction of the frame deformation as fourth modes, the natural frequency is far greater than the HAGC cylinder test frequency range, the frame subjected to dynamic load, displacement The shape response speed is much faster than that of the HAGC cylinder, so the transient performance of the rack will not have a substantial impact on the dynamic test results of the HAGC cylinder. The electro-hydraulic servo valve, HAGC cylinder, connecting pipe, displacement sensor and servo controller are analyzed.
As the main components, the mathematical simulation model was established, and on the basis of the formation of digital simulation model test and control system. According to the actual selected simulation parameters, the use of software simulation analysis and correction of PID hydraulic position closed-loop control testing system, using the open-loop Bode diagram of stability analysis, through the unit step on fast response and closed-loop Bode diagram, the accuracy is calculated and analyzed. The servo valve and cylinder pipe connection between the solution of stiffness, length, diameter, elastic modulus, viscosity of hydraulic oil, the influence degree of frame stiffness variable factors on the test results, the pipeline the results show that the stiffness, length, diameter of the dynamic test results are affected, up to 10% above the basic response time, frame rigidity caused by up to 4.9% basic response time, because of the elastic oil The influence of modulus change can reach 1.7% of the basic response time, and the influence of other factors is very small, but it can not be considered.
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本文編號：1471232