本文關(guān)鍵詞：缸套變形與機(jī)油顆粒對活塞環(huán)-缸套摩擦潤滑影響的研究　出處：《太原理工大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 缸套動態(tài)變形 缸套-活塞環(huán) 有限元仿真 固體顆粒 摩擦潤滑

【摘要】：缸套-活塞環(huán)這對摩擦副作為發(fā)動機(jī)內(nèi)最重要的摩擦副之一,其工作性能的好壞直接影響到發(fā)動機(jī)的整機(jī)性能。然而在目前缸套-活塞環(huán)系統(tǒng)摩擦潤滑的研究中,多數(shù)研究者將缸套內(nèi)表面假設(shè)為理想圓柱殼進(jìn)行仿真模擬,很少有考慮到缸套動態(tài)變形對油膜潤滑的影響作用;同時在分析缸套-活塞環(huán)間潤滑油膜分布特性時,往往將潤滑油液等效為不含雜質(zhì)成分的理想流體,但是基于以上假設(shè)所得到的結(jié)果與實(shí)際潤滑特性相差較大。因此,本文采用數(shù)學(xué)模型計(jì)算與有限元仿真相結(jié)合的方法,將缸套動態(tài)變形和機(jī)油固體顆粒的影響耦合至潤滑模型中,對缸套-活塞環(huán)摩擦潤滑過程進(jìn)行了多因素影響下的研究探索。以煤制柴油(F-T柴油)、生物柴油和甲醇柴油(M15)三種具有不同燃燒特性的替代燃料作為一種可控的缸套動態(tài)響應(yīng)激勵源,對比分析了不同的缸內(nèi)燃燒過程對缸套動態(tài)變形可能產(chǎn)生的影響。本文首先建立了活塞在缸套內(nèi)側(cè)向運(yùn)動的活塞動力學(xué)模型,綜合考慮缸內(nèi)燃?xì)鈮毫εc活塞組件往復(fù)慣性力的影響,計(jì)算獲得了活塞側(cè)擊力曲線及活塞的側(cè)向位移曲線�；谏鲜鰟恿W(xué)模型,結(jié)合有限元分析軟件Patran/Nastran模擬了缸套被燃?xì)鉀_擊與活塞側(cè)向敲擊引起的動態(tài)響應(yīng)。通過缸套有限元動態(tài)仿真獲知,缸套在激勵下發(fā)生了包含模態(tài)響應(yīng)成分的動態(tài)變形,而且進(jìn)一步研究發(fā)現(xiàn)缸套動態(tài)變形的幅值非常接近缸套-活塞環(huán)摩擦副表面粗糙度的量級,表明缸套動態(tài)變形會對潤滑油膜的形成與分布造成直接的影響,為缸套-活塞環(huán)間潤滑油膜厚度計(jì)算和摩擦特性的研究引入了新的影響因素。然后依據(jù)二維平均Reynolds方程,以微凸體接觸模型及Reynolds邊界條件為基礎(chǔ),建立了缸套-活塞系統(tǒng)摩擦、潤滑行為和動力學(xué)行為耦合的流體動壓潤滑數(shù)學(xué)模型。其中考慮了缸套動態(tài)變形與缸套-活塞環(huán)間油膜潤滑耦合作用,對比分析了在是否考慮缸套變形影響下運(yùn)動副之間的摩擦與潤滑特性。同時,為了研究液固二相潤滑中固體顆粒狀態(tài)的變化對活塞環(huán)-缸套摩擦潤滑特性的影響,將顆粒物對油液性能的影響簡化為對黏溫特性的改變,在一維潤滑模型的基礎(chǔ)上,引入固體顆粒的濃度和粒徑參數(shù),預(yù)測分析了缸套-活塞環(huán)間液固二相潤滑情況。最后在單缸水冷柴油機(jī)上開展了一系列臺架試驗(yàn)研究,分析了替代燃料燃燒特性、機(jī)油固體顆粒濃度在不同運(yùn)行工況下對缸套-活塞環(huán)摩擦潤滑特性的影響。采用連續(xù)小波變化分析了動態(tài)變形相關(guān)的缸套振動,基于多分辨率包絡(luò)小波分析技術(shù)研究了與摩擦過程相關(guān)的聲發(fā)射特征信號,試驗(yàn)分析結(jié)果與理論預(yù)測結(jié)論基本吻合,可以為今后內(nèi)燃機(jī)缸套-活塞環(huán)間摩擦潤滑的研究與工業(yè)實(shí)踐提供了一定的理論指導(dǎo)意見。
[Abstract]:The friction in the engine as one of the most important friction pair of cylinder piston ring, its performance directly affects the performance of the engine. However, in the current research of cylinder piston ring friction lubrication system, most of the researchers will be the inner surface of the cylinder is assumed to be an ideal cylindrical shell is simulated, there is little consideration to the cylinder dynamic deformation effect on oil film lubrication; at the same time in the analysis of cylinder piston ring lubrication film distribution, often the lubricating oil equivalent to ideal fluid does not contain impurities, but the above assumptions based on the results and the actual lubrication characteristics are different. Therefore, this method mathematical model the calculation combined with finite element simulation, the influence of coupling to cylinder and oil lubrication model of dynamic deformation of solid particles in the cylinder piston ring friction lubrication process is carried out Study on the influencing factors of the coal exploration. In diesel fuel (F-T diesel), biodiesel and methanol diesel (M15) three alternative with different burning characteristics of the fuel cylinder as a controllable dynamic response of excitation source, comparative analysis of the combustion process in the cylinder deformation of different possible effects on cylinder dynamic firstly. A dynamic model of motion of the piston to the piston in the cylinder inside, considering the influence of the gas pressure inside the cylinder and piston assembly reciprocating inertia force, the lateral displacement curve and piston swipe force calculations. The dynamics model based on the combination of finite element analysis software Patran/Nastran to simulate the gas cylinder by the piston lateral impact and percussion due to the dynamic response. The cylinder dynamic FEM simulation that the modal response components including cylinder dynamic deformation under the excitations, but also further research The maximum amplitude of the cylinder dynamic deformation is very close to the cylinder piston ring friction pair surface roughness magnitude, show that the dynamic deformation of cylinder will cause a direct impact on the formation and distribution of oil film, research for oil film thickness between piston ring and cylinder liner friction characteristics calculation and introduces new factors. Then on the basis of two dimensional averaged Reynolds equation with boundary condition of asperity contact model and Reynolds as the foundation, established the cylinder piston system friction, fluid lubrication behavior and dynamic behavior of coupled hydrodynamic lubrication model. Considering the dynamic deformation of cylinder and cylinder piston ring between the lubricating oil film coupling, a comparative analysis on whether considering the friction and lubrication of cylinder liner deformation under the influence between the pair. At the same time, in order to study the status of solid particles in liquid-solid lubrication in the change of the piston ring cylinder lubrication The influence of the characteristics, the influence of particles on the oil properties is simplified to viscosity temperature characteristics change, based on one-dimensional lubrication model, the introduction of solid particle concentration and particle size parameters, prediction analysis of cylinder piston ring between liquid-solid lubrication. Finally in the single cylinder water-cooled diesel engine was carried out a series of bench test research, analysis of the combustion characteristics of alternative fuels, effect of particle concentration in oil lubrication performance of piston ring - cylinder liner under different operating conditions. By using the continuous wavelet transform of dynamic deformation of liner vibration related analysis, multi resolution wavelet envelope analysis technology research related with the frictional characteristics of acoustic emission signal based on the analysis of the test results and the theoretical prediction is consistent with the conclusions, the research and practice of industrial lubrication can provide certain theoretical guidance meaning for the future of internal combustion engine cylinder piston ring friction See.

【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TK401

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