船舶推进轴系尾轴承润滑数值计算及分析

发布时间：2018-06-30 06:57

本文选题：艉轴承 + 动载荷　；参考：《江苏科技大学》2016年硕士论文

【摘要】：由于大型船舶推进轴系系统中,各种异常振动、磨损的存在,经常引发船舶事故发生,其原因很难用单一的线性理论去解释,人们逐渐认识到必须用非线性理论来分析。船舶艉轴承由于润滑环境比较恶劣,而且出现的故障,影响因素较多,尾轴承润滑特性的研究对于船舶动力轴系良好的运转有重要的意义。本文第一部分阐述了研究船舶艉轴承润滑特性的理论意义和实用价值,介绍了国内外研究径向滑动轴承润滑特性的相关方法和结论等,从转子动力学、流体润滑理论、艉轴润滑计算边界条件、动载荷、轴心轨迹计算方法等几方面综述了径向滑动轴承润滑特性的研究方向和进展,并以此提出了本文的研究内容。第二部分建立了倾斜艉轴承润滑数学模型,编制了FORTRAN求解程序,计算了船舶推进轴系轴径倾斜对轴承负荷的影响,轴径倾斜角的不同使轴承油膜压力、厚度产生变化,从而使油膜最大压力产生变化,继而对轴承负荷产生影响。第三部分建立了非稳定载荷下艉轴承轴心轨迹的数学模型,利用压力叠加法计算了了突加载荷和旋转载荷下的轴心轨迹,得到了非稳定载荷下,艉轴轴心轨迹曲线,并分析了艉轴运转状态。第四部分建立了基于Reynolds边界条件的船舶艉轴承润滑特性的计算模型,分析了四种工况下转速、艉轴宽度、轴径倾斜角和外载荷不同情况下,得到了非稳定载荷下,艉轴承偏心率、最大油膜压力和厚度等润滑参数,并分析了艉轴运转状态。第五部分建立了动载荷下艉轴承承载力数学模型,编制了FORTRAN数值计算程序,分析了艉轴承在不同转速、倾斜角以及长径比下,承载力随偏心率的变化,从而进行轴承稳定性效果的分析。第六部分总结了本文的工作内容,因模型的简化和实际情况有一定偏差,所以需要指出进一步研究的内容和展望。
[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.
【学位授予单位】：江苏科技大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U664.21

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