本文選題：艉軸承 + 動載荷　； 參考：《江蘇科技大學(xué)》2016年碩士論文

【摘要】：由于大型船舶推進軸系系統(tǒng)中,各種異常振動、磨損的存在,經(jīng)常引發(fā)船舶事故發(fā)生,其原因很難用單一的線性理論去解釋,人們逐漸認(rèn)識到必須用非線性理論來分析。船舶艉軸承由于潤滑環(huán)境比較惡劣,而且出現(xiàn)的故障,影響因素較多,尾軸承潤滑特性的研究對于船舶動力軸系良好的運轉(zhuǎn)有重要的意義。本文第一部分闡述了研究船舶艉軸承潤滑特性的理論意義和實用價值,介紹了國內(nèi)外研究徑向滑動軸承潤滑特性的相關(guān)方法和結(jié)論等,從轉(zhuǎn)子動力學(xué)、流體潤滑理論、艉軸潤滑計算邊界條件、動載荷、軸心軌跡計算方法等幾方面綜述了徑向滑動軸承潤滑特性的研究方向和進展,并以此提出了本文的研究內(nèi)容。第二部分建立了傾斜艉軸承潤滑數(shù)學(xué)模型,編制了FORTRAN求解程序,計算了船舶推進軸系軸徑傾斜對軸承負荷的影響,軸徑傾斜角的不同使軸承油膜壓力、厚度產(chǎn)生變化,從而使油膜最大壓力產(chǎn)生變化,繼而對軸承負荷產(chǎn)生影響。第三部分建立了非穩(wěn)定載荷下艉軸承軸心軌跡的數(shù)學(xué)模型,利用壓力疊加法計算了了突加載荷和旋轉(zhuǎn)載荷下的軸心軌跡,得到了非穩(wěn)定載荷下,艉軸軸心軌跡曲線,并分析了艉軸運轉(zhuǎn)狀態(tài)。第四部分建立了基于Reynolds邊界條件的船舶艉軸承潤滑特性的計算模型,分析了四種工況下轉(zhuǎn)速、艉軸寬度、軸徑傾斜角和外載荷不同情況下,得到了非穩(wěn)定載荷下,艉軸承偏心率、最大油膜壓力和厚度等潤滑參數(shù),并分析了艉軸運轉(zhuǎn)狀態(tài)。第五部分建立了動載荷下艉軸承承載力數(shù)學(xué)模型,編制了FORTRAN數(shù)值計算程序,分析了艉軸承在不同轉(zhuǎn)速、傾斜角以及長徑比下,承載力隨偏心率的變化,從而進行軸承穩(wěn)定性效果的分析。第六部分總結(jié)了本文的工作內(nèi)容,因模型的簡化和實際情況有一定偏差,所以需要指出進一步研究的內(nèi)容和展望。
[Abstract]:Due to the existence of various abnormal vibration and wear in the propulsion shafting system of large ships, ship accidents often occur, and the reasons are difficult to be explained by a single linear theory. People gradually realize that the nonlinear theory must be used to analyze the problems. Due to the bad lubricating environment and faults, there are many factors affecting the ship stern bearing. The study of the lubricating characteristics of the stern bearing is of great significance for the good operation of the ship's power shafting. In the first part of this paper, the theoretical significance and practical value of studying the lubrication characteristics of stern bearings are described, and the relevant methods and conclusions of studying the lubrication characteristics of radial sliding bearings at home and abroad are introduced, including rotor dynamics, fluid lubrication theory, etc. The research direction and progress of lubrication characteristics of radial sliding bearings are reviewed in this paper, including boundary conditions, dynamic loads and calculation methods of axial trajectory, and the research contents of this paper are put forward. In the second part, a mathematical model of tilted stern bearing lubrication is established, and a FORTRAN program is developed to calculate the influence of shaft diameters of marine propulsion shaft system on bearing load. Thus, the maximum pressure of oil film is changed, and then the bearing load is affected. In the third part, the mathematical model of the axial trajectory of stern bearing under unstable load is established, and the trajectory of shaft center under sudden loading and rotating load is calculated by using the pressure superposition method, and the trajectory curve of stern shaft axis under unstable load is obtained. The operating state of stern shaft is analyzed. In the fourth part, the calculation model of ship stern bearing lubrication characteristics based on Reynolds boundary condition is established, and the unstable loads are obtained under the different conditions of rotating speed, stern shaft width, shaft diameter inclination angle and external load under four working conditions. The lubrication parameters such as eccentricity of stern bearing, maximum oil film pressure and thickness are analyzed. In the fifth part, a mathematical model of bearing capacity under dynamic load is established, and a FORTRAN program is developed to analyze the variation of bearing capacity with eccentricity under different rotational speeds, inclined angles and aspect ratios. Thus, the bearing stability effect is analyzed. The sixth part summarizes the work of this paper, because there is a certain deviation between the simplification of the model and the actual situation, it is necessary to point out the contents and prospects of further research.
【學(xué)位授予單位】：江蘇科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：U664.21

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