小型農(nóng)田起重機設計

小型農(nóng)田起重機設計,小型農(nóng)田起重機設計,小型,農(nóng)田,起重機,設計 附錄1：外文翻譯為了更準確地了解汽車起重機抗傾覆穩(wěn)定性的可靠性，在以總體關鍵參數(shù)為設計變量的動態(tài)軟件環(huán)境中建立了參數(shù)化多體動力學模型。在此基礎上，根據(jù)工作條件和起重機動力學仿真結果，建立了該車起重機的穩(wěn)定性判據(jù)。對影響汽車起重機穩(wěn)定性的設計變量，采用截斷正態(tài)分布抽樣法，采用蒙特卡羅方法對其可靠性進行了分析。結果表明，在最危險工況下，汽車起重機的穩(wěn)定性可靠度為0.9998。分析表明，采用現(xiàn)代多體動力學和蒙特卡羅方法對汽車起重機抗傾覆穩(wěn)定性進行可靠度計算是可行的，其計算結果比傳統(tǒng)安全系數(shù)法更準確。 大型數(shù)控機床恒流量閉式靜壓轉臺的變形，由于其直徑大、承載能力強，對膜厚有很大的影響。根據(jù)彈性圓板變形理論，推導了在不同位置承受均布力的簡支條件下工作臺變形的微分方程。給出了工作臺的位移曲線。發(fā)現(xiàn)了靜壓轉臺的受力和變形缺陷，為支持重型工件加工的定位和油膜是否失效提供了理論依據(jù)。 計算了汽車制動系統(tǒng)的設計，并根據(jù)已知的汽車相關參數(shù)進行了主要參數(shù)的計算。研究了制動制動力矩、制動力矩和制動力分配系數(shù)以及液壓制動驅動機構的相關參數(shù)。最后對制動性能進行了詳細的分析。 研制了一套渦流檢測與自動分離系統(tǒng)，對HFW管道中的焊縫缺陷進行檢測，并對缺陷管進行分離。應用相敏檢測器，通過低通濾波器獲得焊縫缺陷的純信號。將焊縫缺陷信號信息、飛鋸位移信息和焊管焊接速度信息融合在一起。建立了缺陷焊管非定長截斷的數(shù)學模型。設計了一種自動分離系統(tǒng)，用于切割和分離生產(chǎn)線中有缺陷的焊管。對空氣流動及其模型的研究主要集中在設計雙層蓋屋頂，建議在潮濕的建筑物中使用。軟件ansys采用CFD方法進行建模。通風雙層屋頂設計的首要問題是選擇最佳的空氣腔厚度。 根據(jù)選定的模型，在閣樓外緣的1.76米和4.23米之間有一個盲點，空氣倒流發(fā)生在上屋頂甲板的底面上，導致通風腔通風不良。曲軸的動強度分析是結構設計的基礎。本文討論了用亞當斯軟件進行動態(tài)仿真的方法，同時對簡支梁、連續(xù)梁模型、單拐模型和整體接觸模型三種傳統(tǒng)的應力分析方法進行了比較。提出了一種新的計算方法：首先用雷諾茲方程建立油膜模型，得到油膜剛度，然后將其等效為彈簧沖擊軸頸的等效剛度，最后建立整個曲軸的有限元模型。該模型能更準確地反映曲軸的實際情況，可用于曲軸的優(yōu)化設計。雙交叉步降應力加速壽命試驗（dcsds-alt）本文采用開關下雙應力交替。與恒應力試驗相比，階梯應力試驗減少了試件數(shù)量、時間和成本，最終提高了加速試驗的效率。對于氣動缸，應力測試失效物理可以描述為累積退化模型。利用累積損傷一般對數(shù)線性關系和威布爾假設，在恒定應力測試下，將失效數(shù)據(jù)等效轉化為失效數(shù)據(jù)。然后，可以更準確地導出可靠性規(guī)范。平均壽命估計誤差的5%和特征壽命誤差的1.85%對氣動工業(yè)壽命預測非常滿意。本文研究了sc50c液壓履帶式起重機13米基本臂，使靜態(tài)分析起重機基本臂采用ANSYS軟件，得到應力分布。根據(jù)起重機基本臂架的載荷和結構特點，建立了起重機臂架的有限元模型，為起重機臂架的設計和優(yōu)化提供參考。一個完整的液壓系統(tǒng)由五個部分組成，即動力元件、控制元件、輔助元件和液壓油的實現(xiàn)。原動力流體在動力元件中的作用轉化為機械能的壓力，即液壓系統(tǒng)的泵，它是驅動整個液壓系統(tǒng)的動力。液壓泵齒輪的結構形式一般為泵、葉片泵和活塞泵。實現(xiàn)元件(如液壓缸和液壓馬達)，即液體的壓力可以轉化為機械能，以驅動負荷直線往復運動或旋轉運動。控制元件(即各種液壓閥)在液壓系統(tǒng)中控制和調節(jié)液體壓力、流量和方向。根據(jù)控制功能的不同，將液壓控制閥分為閥門、流量控制閥和方向控制閥。壓力控制閥分為效益流量閥(安全閥)、減壓閥、順序閥、壓力繼電器等；流量控制閥包括節(jié)流閥、調節(jié)閥、分流閥組等；方向控制閥包括單向閥、單向流體控制閥、穿梭閥、閥等。在控制方式不同的情況下，可分為液壓閥控制開關閥、控制閥和設定比值控制閥。輔助部件，包括油箱、濾油器、油管和管接頭、密封件、壓力表、油位、油元等。液壓油是液壓系統(tǒng)中的工作能量傳遞介質，有各種礦物油、乳化油液壓成型霍普類。液壓系統(tǒng)的作用是幫助人類工作。主要是通過實現(xiàn)元件的旋轉或壓力成往復運動。液壓系統(tǒng)和液壓功率控制信號由兩部分組成，信號控制部分采用液壓部分驅動控制閥運動。部分液壓功率是指用電路圖來表示不同功能的元件之間的相互關系。含液壓泵源、液壓馬達及輔助元件；液壓控制部分包含各種控制閥，用于控制油液流量、壓力和方向；操作或液壓缸與液壓馬達配合，根據(jù)實際需要自行選擇。附錄2：外文原文To more accurately learn reliability on anti-overturning stability for a truck crane, a parametric muti-body dynamics model is built in a dynamic software environment with overall key parameters as design variables. On this basis, stability criteria of this truck crane are established according to the working conditions and crane dynamics simulation results. After a truncated normal distribution sampling method is given for design variables which will effect on truck cranes stability, the reliability analysis of this truck crane is done via Monte Carlo method. The result indicates that the truck cranes stability reliability is 0.9998 in the most dangerous working condition. Analysis shows that the reliability calculation of truck crane anti-overturning stability is feasible using modern muti-body dynamics and Monte Carlo method, and the results are more accurate than conventional safety factor method.The deformation of constant flow and closed type hydrostatic rotary table of heavy duty CNC machine tool has a great influence on the film thickness because of its large diameter, high load-bearing. According to the circular plate deformation theory of elasticity, differential equations of worktable deformation are derived in the simply supported conditions when bearing uniform force of different locations. Displacement curves of worktable are obtained. Force and deformation weaknesses of hydrostatic rotary table are found, which can provide theory basis for supporting location of heavy workpiece machining and whether oil film is failure or not. Calculation of car brake system design, also according to the known automotive related parameters is obtained by calculating the main parameters. The brake and braking torque, braking moment and braking force distribution coefficient and hydraulic brake drive mechanism related parameters. Finally, the braking performances are analyzed in detail. An eddy current detection and automatic separating system is developed to defect the weld defects in HFW pipe and separate the defective pipe. Application of phase sensitive detector, the pure signal of the weld defect is obtained through a low-pass filter. The information of the weld defect signal, the displacement of flying saw and the welding speed of welded pipe are fused together. The mathematical model is established for unfixed length truncation of the defective welded pipe. An automatic separating system is designed to cut and separate the defective welded pipes in the production line. The study of air flow and its modelling is particularly focused on designing double-cladding roofs, which are recommended for buildings in wet conditions. Software ANSYS , which uses CFD method, is used for the modelling. The primary issue concerning the design of ventilated double-cladding roofs is to select the optimum thickness of air cavity. Based on the selected model, there is a blind spot in between 1.76 m and 4.23 m of the outer edge of the attic where air back flow occurs at the bottom surface of the upper roof deck which leads to poor ventilation of the ventilated cavity. Dynamic and strength analysis of crankshaft is the basis of structural design. The paper discussed the dynamic simulation method using software of ADAMS, at same time compared the three traditional stress analysis methods: simply supported beam or continuous beam model, single crank model and overall contact model. A new method was proposed, firstly to establish the oil film model with Reynolds equation and obtain the oil film stiffness, then to treat it as the equivalent stiffness of spring impacting on shaft neck, lastly to create the finite element model of the whole crankshaft. The model will be more precisely reflect the real conditions and can be use to the optimization of crankshaft. Double Crossed Step-Down-Stress Accelerated Life Testing (DCSDS-ALT) discussed in this paper was implemented by switch down the double stresses alternately. Compared to constant stress test, step-stress test decreased specimen numbers, time and cost, and eventually well improve the accelerated testing efficiency. For pneumatic cylinder, the step-down-stress testing failure physics can be described as cumulative degradation model. By use of cumulative damage General Log-Linear relationship and Weibu ll assumption, the failure data obtained were equivalently converted to failure data under constant stress testing. Then the reliability specifications can be derived with better accuracy. The 5% of average lifetime estimation error and 1.85% of the characteristic lifetime error are very satisfying for pneumatic industrial lifetime prediction. This article studied the 13 m basic boom of SC50C hydraulic crawler crane, and made static analysis on crane basic boom by applying ANSYS, and obtains the stress distribution. Based on the features of the loads and structure of the crane basic boom, this paper sets up a finite element model of it, thus providing reference for the design and optimization of crane boom. A complete hydraulic system consists of five parts, namely, power components, the implementation of co- mponents, control components, auxiliary components and hydraulic oil. The role of dynamic components of the original motive fluid into mechanical energy to the pressure that the hydraulic system of pumps, it is to power the entire hydraulic system. The structure of the form of hydra- ulic pump gears are generally pump, vane pump and piston pump. Implementation of components (such as hydraulic cylinders and hydraulic motors) which is the pressure of the liquid can be converted to mechanical energy to drive the load for a straight line reciprocating movement or rotational movement.Control components (that is, the various hydraulic valves) in the hydraulic system to control and regulate the pressure of liquid, flow rate and direction. According to the different control functions, hydraulic pressure control valve can be divided into valves, flow control valves and directional control valve. Pressure control valves are divided into benefits flow valve (safety valve), pressure relief valve, sequence valve, pressure relays, etc.; flow control valves including throttle, adjusting the valves, flow diversion valve sets, etc.; directional control valve includes a one-way valve , one-way fluid control valve, shuttle valve, valve and so on. Under the control of different ways, can be divided into the hydraulic valve control switch valve, control valve and set the value of the ratio control valve. Auxiliary components, including fuel tanks, oil filters, tubing and pipe joints, seals, pressure gauge, oil level, such as oil dollars. Hydraulic oil in the hydraulic system is the work of the energy transfer medium, there are a variety of mineral oil, emulsion oil hydraulic molding Hop categories.The role of the hydraulic system is to help humanity work. Mainly by the implementation of components to rotate or pressure into a reciprocating motion. Hydraulic system and hydraulic power control signal is composed of two parts, the signal control of some parts of the hydraulic power used to drive the control valve movement. Part of the hydraulic power means that the circuit diagram used to show the different functions of the interrelationship between components. Containing the source of hydraulic pump, hydraulic motor and auxiliary components; hydraulic control part contains a variety of control valves, used to control the flow of oil, pressure and direction; operative or hydraulic cylinder with hydraulic motors, according to the actual requirements of their choice.