【摘要】：滑動(dòng)軸承以承載力大、功耗小、耐沖擊、運(yùn)轉(zhuǎn)精度高、抗震性好被廣泛用于汽輪機(jī)等動(dòng)力傳輸系統(tǒng)中,可以說,滑動(dòng)軸承性能的好壞直接影響機(jī)械部件的使用壽命與正常運(yùn)行。隨著工程技術(shù)的發(fā)展,極端環(huán)境下機(jī)械部件的正常運(yùn)行成為大家所關(guān)注的焦點(diǎn),例如高溫、高壓、高轉(zhuǎn)速和重載荷等。對(duì)滑動(dòng)軸承在極端條件下進(jìn)行研究可明確滑動(dòng)軸承在極端條件下的運(yùn)行狀況,對(duì)后續(xù)滑動(dòng)軸承研發(fā)與特性研究具有重要的實(shí)際意義。軸在轉(zhuǎn)動(dòng)過程中,在剪切力的作用下潤(rùn)滑油粘性耗散產(chǎn)生一定的熱量,且在漸擴(kuò)區(qū)域發(fā)生明顯的空化現(xiàn)象,故滑動(dòng)軸承粘溫特性與空化現(xiàn)象不容忽視。鑒于此,本文以單油楔雙向潤(rùn)滑槽滑動(dòng)軸承為研究對(duì)象,采用數(shù)值模擬方法對(duì)滑動(dòng)軸承靜動(dòng)態(tài)特性進(jìn)行研究。本文主要研究?jī)?nèi)容如下:第一章:論述了單油楔雙向潤(rùn)滑槽滑動(dòng)軸承研究背景與意義,并闡述了滑動(dòng)軸承國(guó)內(nèi)外研究現(xiàn)狀;第二章:對(duì)滑動(dòng)軸承數(shù)值計(jì)算模型做了簡(jiǎn)要概述;第三章:滑動(dòng)軸承數(shù)值計(jì)算模型的驗(yàn)證及網(wǎng)格獨(dú)立性檢驗(yàn),確立了單油楔雙向潤(rùn)滑槽滑動(dòng)軸承計(jì)算模型;第四章:分別在不同偏心率、不同供油角度、不同供油壓力、不同供油溫度、不同環(huán)境溫度與不同軸轉(zhuǎn)速下單油楔雙向潤(rùn)滑槽滑動(dòng)軸承的靜態(tài)特性進(jìn)行了研究;第五章:以某一穩(wěn)態(tài)工況點(diǎn)流場(chǎng)參數(shù)分布為初值,對(duì)軸施加階躍擾動(dòng)載荷,根據(jù)相對(duì)運(yùn)動(dòng)原理,提出了軸瓦平動(dòng)、主軸旋轉(zhuǎn)的流固耦合計(jì)算方法,研究了單油楔雙向潤(rùn)滑槽滑動(dòng)軸承的動(dòng)態(tài)特性。
[Abstract]:Sliding bearings are widely used in power transmission systems such as steam turbines because of their large bearing capacity, low power consumption, high impact resistance, high operating precision and good seismic resistance. It can be said that the performance of sliding bearings directly affects the service life and normal operation of mechanical components. With the development of engineering technology, the normal operation of mechanical components in extreme environment has become the focus of attention, such as high temperature, high pressure, high speed and heavy load. The study of sliding bearings under extreme conditions can make clear the running condition of sliding bearings under extreme conditions, which is of great practical significance to the subsequent research and development of sliding bearings and the study of their characteristics. In the process of shaft rotation, the viscosity dissipation of lubricating oil under the action of shear force produces certain heat, and obvious cavitation occurs in the area of gradual expansion, so the visco-temperature characteristic and cavitation phenomenon of sliding bearing can not be ignored. In view of this, the static and dynamic characteristics of single oil wedge bidirectional lubricating groove sliding bearing are studied by numerical simulation method. The main contents of this paper are as follows: chapter 1: the research background and significance of single oil wedge bidirectional lubricating groove sliding bearing are discussed, and the present research situation of sliding bearing at home and abroad is expounded. Chapter 3: verify the numerical calculation model of sliding bearing and verify the independence of grid, and establish the calculation model of single oil wedge two-way lubricating groove sliding bearing. Chapter 4: the static characteristics of the bearing with different eccentricity, different oil supply angle, different oil supply pressure, different oil supply temperature, different environment temperature and different shaft speed are studied. Chapter 5: taking the flow field parameter distribution of a steady state point as the initial value, applying the step disturbance load on the shaft, according to the principle of relative motion, the fluid-solid coupling calculation method of the axial bearing is put forward. The dynamic characteristics of single oil wedge two-way lubricating groove sliding bearing are studied.
【學(xué)位授予單位】：蘭州理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TH133.31

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本文編號(hào)：2371980