本文關(guān)鍵詞：內(nèi)燃機(jī)主軸承變形特性及影響規(guī)律研究　出處：《北京理工大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 主軸承 多體動(dòng)力學(xué) 有限元 動(dòng)態(tài)特性 變形

【摘要】：曲軸作為往復(fù)式壓縮機(jī)的關(guān)鍵核心部件，曲軸在機(jī)組運(yùn)轉(zhuǎn)過程中承受著隨時(shí)間周期性變化的交變載荷，正是這種交變載荷的作用使得曲軸和主軸承受到不同程度的變形，不僅影響著自身的使用壽命，而且關(guān)系到發(fā)動(dòng)機(jī)的安全性和穩(wěn)定性，對其他零部件的使用壽命和性能也存在很大的負(fù)面影響。因此對曲軸與主軸承結(jié)構(gòu)之間的動(dòng)力學(xué)特性特別是彼此之間變形的協(xié)調(diào)性分析已成為內(nèi)燃機(jī)可靠性工程中的重要課題。本文主要圍繞以下三個(gè)方面進(jìn)行研究： ⑴如何表達(dá)和評價(jià)曲軸與主軸承的變形 根據(jù)形位誤差理論對圓類零件變形的評價(jià)指標(biāo)進(jìn)行了研究，包括描述主軸承橫截面變形的失圓度；描述多個(gè)主軸承整體性變形情況的同軸度、圓跳動(dòng)和圓柱度；以及主軸承與外面零部件（曲軸）之間變形的協(xié)調(diào)性，并且將這些評價(jià)指標(biāo)的數(shù)學(xué)定義實(shí)現(xiàn)為算法代碼。 ⑵曲軸與主軸承的動(dòng)力學(xué)特性及影響規(guī)律研究 以某12V機(jī)型柴油機(jī)為研究對象進(jìn)行曲軸-主軸承結(jié)構(gòu)動(dòng)力學(xué)仿真分析，分析中主要運(yùn)用AVL-EXCITE動(dòng)力學(xué)和有限元相結(jié)合的方法，得到曲軸系的扭轉(zhuǎn)振動(dòng)特性，并通過實(shí)驗(yàn)對仿真模型進(jìn)行了驗(yàn)證。采用軸承間隙和軸頸傾斜角度等參數(shù)對曲軸-主軸承之間的協(xié)調(diào)變形進(jìn)行了研究，歸納了不同轉(zhuǎn)速、軸承徑向間隙、不同載荷及油壓下曲軸-主軸承協(xié)調(diào)變形影響規(guī)律。 ⑶關(guān)鍵參數(shù)對單個(gè)及整體主軸承變形影響分析 建立了曲軸、機(jī)體有限元模型，，研究主軸承在預(yù)緊工況、過盈工況、潤滑油膜載荷工況下的主軸承剛度分析，并歸納不同參數(shù)對主軸承截面失圓度和多個(gè)主軸承整體協(xié)調(diào)變形的影響規(guī)律。為內(nèi)燃機(jī)主軸承變形分析提供指導(dǎo)依據(jù)。
[Abstract]:Crankshaft as the key component of reciprocating compressor, crankshaft in the operation process of the unit to withstand periodic changes with time alternating load. It is this kind of alternating load that causes the crankshaft and the main bearing to be deformed to varying degrees, which not only affects their service life, but also relates to the safety and stability of the engine. Therefore, the coordination analysis of dynamic characteristics between crankshaft and main bearing structure, especially the deformation between each other, has become the reliability engineering of internal combustion engine. This paper focuses on the following three aspects:. 1. How to express and evaluate the deformation of crankshaft and main bearing According to the theory of shape and position error, the evaluation index of circular parts deformation is studied, including describing the misroundness of cross section deformation of main bearing. Describes the coaxiality, roundness and cylindricity of the integral deformation of multiple main bearings; And the compatibility of deformation between the main bearing and the outside parts (crankshaft), and the mathematical definition of these evaluation indexes is realized as the algorithm code. Study on dynamic characteristics and influence law of crankshaft and main bearing Taking a 12V diesel engine as the research object, the dynamic simulation of crankshaft-main bearing structure is carried out. The method of combining AVL-EXCITE dynamics with finite element method is mainly used in the analysis. The torsional vibration characteristics of crankshaft system are obtained and the simulation model is verified by experiments. The coordinated deformation between crankshaft and main bearing is studied by using the parameters such as bearing clearance and journal inclination angle. The effects of different rotational speed, radial clearance, different load and oil pressure on the coordinated deformation of crankshaft and main bearing are summarized. Analysis of influence of key parameters on deformation of single and integral main bearing The finite element model of crankshaft and block is established to study the stiffness analysis of main bearing under preload condition, interference mode and lubricating oil film load condition. The influence of different parameters on the misroundness of the main bearing section and the coordinated deformation of multiple main bearings is summarized, which provides a guide for the analysis of the deformation of the main bearing of the internal combustion engine.
【學(xué)位授予單位】：北京理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TK428

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