流体动压滑动轴承优化设计

建立了流体动压滑动轴承优化设计的数学模型，采用罚函数法设计了优化程序并提供了算例，对流体动压滑动轴承设计具有一定的实践意义。     

汽轮机流体动压滑动轴承的优化设计

轴承是转子运转系统的关键零部件,相当于机械的关节。在机械设备的运转过程中,电机噪声、温度、振动等因素都会对轴承的使用寿命造成影响,而一旦轴承发生故障问题,将带来难以预料的严重后果。本文结合流体动压滑动轴承的影响因素,对汽轮机流体动压滑动轴承的优化设计进行探讨研究,为提升滑动轴承设计质量提供参考和借鉴。     

齿轮箱流体动压滑动轴承的多目标优化

建立了流体动压径向滑动轴承优化设计的数学模型,借助Matlab优化工具箱,对齿轮箱径向滑动轴承进行了优化设计,结果表明该方法能够获得比常规设计更佳的设计参数。     

国外摩擦磨损润滑文献索引

弹性流体动力润滑 ④气体动压推力轴承,KpoBoH。。,B.K·咤苏联专利1,651,。7补,1991,o ②非对中出现涡穴的流体动压滑动轴承的分析和·数值研究,Choy,F.K.《Tribol.Int.》,1992,Vol.25,No.1,3一16 ⑧无负荷浸油流体动压滑动轴承锥形回旋不稳定性的理论分析,Pai.R.《Wear》,1992,Vol.152,No.2,30,一316 噜全尺寸流体动压滑动轴承铁谱术分析失效过程,Akagaki,T.《同仁》,241~252 汤动载荷下浸油四叶流体动压滑动轴承的稳定性,Pai,R.《同上》,No.1,95一108 ⑥紊流有限流休动压滑动轴承的刚性转子的稳定性,Ku扭ar,A.《同上》,No.1,11…     

流体动压滑动轴承优化设计(一)流体动压滑动轴承设计与最优化

一、设计理论的发展流体动压滑动轴承具有承载能力大、功耗小、耐冲击、抗振性好、运转精度高等突出的优点,所以在高速大功率机器(汽轮机、发电机、压缩机等),低速重载机器(轧钢机)以及高速精密机床(磨床)中都获得广泛应用,而且是机器中的重要部件。多年来,为提高机器的性能、寿命和可靠性,对流体动压滑动轴承的设计理论开展了广泛深入的研究。     

国外摩擦磨损润滑文献索引

流体动压 ①重载有限滑动轴承三维EHD润滑的数字解,Sun,M.《J.Hydrodyn.B.》,1992,Vol.4,No.1,78-87 ②微极性流体的有限流体动压滑动轴承的油膜破裂和重新形成边界的分析,Lin,T.R.《Wear》,Vol.161.No.1-2,145-153 ③安装在梁上的流体动压滑动轴承衬垫及其制造法,Russell Ide,D.《美国专利5112143》,1992.5. ④附有螺旋槽的球形气体动压支座的稳定性,rpHroHbeD,6, C.《Ⅱp06刀.MamHHEOCTp· ⅡHa厦elc.MamⅡⅡ.》1993,No.3,39—47. ⑤磁流体动压轴承,Morita,K.《美国专利5032751》,1989,6.     

球形凹坑织构参数对动压滑动轴承承载特性的影响

以球形凹坑织构动压滑动轴承为对象,基于流体动压润滑机理,建立含有球形凹坑织构的动压滑动轴承数学模型,推导轴承油膜厚度方程,并采用有限差分法求解Reynolds方程,借助MATLAB软件分别研究织构间距、织构深度等参数对动压滑动轴承承载特性的影响规律。结果表明:当织构深度一定时,存在最优织构间距使得动压滑动轴承的承载性能最优;当织构间距一定时,存在最优织构深度使得动压滑动轴承的承载性能最优。     

发动机滑动轴承的弹性流体润滑设计

通过用弹性流体动压润滑的理论,对发动机滑动轴承的工作状况进行定量分析,建立了发动机弹性流体润滑的计算模型与基本方程组,并给出发动机滑动轴承全弹性流体设计的应用公式。     

径向波箔轴承承载特性分析

波箔轴承是一种弹性表面流体动压滑动轴承，在两维雷诺方程的基础上，本文给出了适用于波箔轴承计算的雷诺方程，结合使用差方法，可以求出它的压力分布曲线，并将其与刚性表面的流体动压滑动轴承作比较研究。     

织构分布对动压滑动轴承油膜压力的影响

以动压滑动轴承为研究对象,根据流体动压润滑原理,建立圆形微凹坑织构化动压滑动轴承油膜数学模型,推导织构化滑动轴承油膜厚度修正公式;结合Reynolds方程有限差分法的求解方法,分析全织构和织构化参数(间距、深度)对动压滑动轴承圆周方向压力分布的影响。结果表明:分布在轴承上的全织构会引起油膜压力的变化;织构位于不同的位置时对圆形微凹坑织构滑动轴承的油膜压力的影响是不同的,对于不同间距和深度的织构,当织构位于升压区时,动压滑动轴承具有较好的润滑、承载性能,而织构位于降压区和全织构时不利于轴承承载。     

300MW汽轮机轴瓦振动大原因分析及处理

汽轮机轴承振动是发电厂常见的设备异常之一,影响汽轮机振动的因素很多,对上海汽轮机有限公司设计制造、型号为N300-16.7/538/538/H156型汽轮机在运行过程中发现的#1轴承振动大原因进行了分析,并利用排除法对影响振动的原因进行逐个排除,最后找到问题所在,进行处理后#1轴承振动值恢复正常。     

转轴-可倾瓦-密封系统振动稳定性测试分析

针对现场实测振动数据表明转轴-可倾瓦-密封系统存在的振动失稳问题,从可倾瓦参数的理论模型、汽流激振力、进汽方式、运行参数、轴承载荷、安装工艺等角度分析转轴-可倾瓦-密封系统振动失稳的原因,并深入讨论转轴-可倾瓦-密封系统振动稳定裕度问题,提出用对数衰减率、系统阻尼、系统抗定常干扰界限值来描述系统的稳定性。     

某汽轮机轴瓦碎裂原因分析及处理

对某汽轮发电机组1#轴承轴瓦经常发生碎裂故障的原因进行了分析,该轴承轴颈的振动、水平偏移量及晃动过大等是导致轴瓦碎裂的主要原因。通过减小该轴承轴颈偏移量,增加其最小油膜厚度及对机组进行动平衡,有效解决了轴承轴瓦碎裂的故障。     

Study on Sludge Formation during the Oxidation Process of Turbine Oils

Against the backdrop of increased needs for longer operating life of turbine oils, there is a tendency to use amine-type antioxidants for steam turbine oils as well as gas turbine oils. Amine-type antioxidants are known to form sludge during the oxidation process, and the sludge formation from turbine oils involves the high risk for a power plant of bearing temperature rise caused by sludge deposition onto the bearing surface. But currently, there is no global specification to evaluate the sludge formation from turbine oils that have high rotating bomb oxidation test (RBOT) life. In this study, we examined 18 kinds of commercially produced turbine oils and two kinds of originally prepared oils with amine additives on sludge formation under 120°C dry turbine oil oxidation stability test (TOST) accelerated degradation test. Consequently, we found a criterion to check the quality of sludge resistance of turbine oils based on the relationship between the RBOT residual ratio and weight of filter residues(1μ m pore filter).     

The use of experimental results in solving tribological problems

The use of extreme pressure (EP) additives resulted in increased gear life for the driving unit of a hot roll stand in a steel work. For large diameter sliding bearings operational problems caused by the surface roughness of the journal and bearing linings can be eliminated by using oil of the correct viscosity together with careful filtering.Seizure of the jaw coupling of a steam turbine can be eliminated by an appropriate material combination which is assessed by seizure investigations. Structural changes based on the results of an experimental investigation of sticking have eliminated unreliable operation of a starting device for a steam turbine.     

汽轮机安全监视系统信号突变故障分析及处理

针对某石化公司GB201压缩机组中汽轮机端轴位移和轴振动信号出现的突变现象,对汽轮机接地电刷、BENTLY3500接地系统及静电产生原因进行了研究。由于机组不能停机,先对可能导致故障的各相关因素进行了分析。排除可以排除的因素,在线检测及更换了汽轮机接地电刷、在线检测了BENTLY 3500接地系统及分析了转子带电或带磁的影响。最后判定润滑油受高速运转的转子与轴承挤压摩擦产生了静电,并且因轴承座较大而导致TSI探头的同轴接头在轴承座内,接头长期浸泡在50℃左右的润滑油里中,绝缘效果或变差,静电累积到同轴接头上,从而导致静电荷积聚及突变现象的产生。后在机组停机检修时,打开轴承座检查,对同轴接头重新做了绝缘处理,再次开机后恢复正常。研究结果表明,信号突变是由于润滑油高速运转的转子与轴承挤压摩擦产生静电及轴承箱内的TSI探头同轴接头绝缘失效。     

A novel nonlinear model of rotor/bearing/seal system and numerical analysis

A novel nonlinear model of rotor/bearing/seal system based on the Hamilton principle is proposed for steam turbine systems in power plants. The Musznyska model and unsteady bearing oil-film force model were applied to describe the nonlinear steam excitation force and oil-film force. The Runge-Kutta method was used to solve the motion equation of the rotor/seal/bearing system. The dynamic characteristics of the rotor/bearing/seal system were analyzed with bifurcation diagrams, time-history diagrams, trajectory diagrams, Poincare maps and frequency spectrums. The numerical analysis indicates that the seal force and the oil-film force influence the nonlinear dynamic characteristics of the rotor system. With the increase of rotation speed, the rotor system exhibits rich forms of periodic, double-periodic, multi-periodic, quasi-periodic and chaotic motion. The combined impact of steam excitation force and bearing oil-film force may cause a severe vibration which seriously affects the safety and stability of the rotor. The presented model provides a theoretic foundation for further research on the ultra-supercritical steam turbines.     

Prevention of fluttering fatigue damage in a tilting pad journal bearing

Tilting pad journal bearings have been widely used to support high-pressure/fast rotating turbine rotors owing to their inherent dynamic stability characteristics. However, fatigue damage in the upper unloaded pads and the break of locking pins by pad fluttering continuously take place in actual steam turbines. The purpose of this paper is to develop a bearing model that can prevent bearing problems effectively using pad fluttering in a tilting pad journal bearing. A developed bearing model with a wedged groove is suggested from studies of a fluttering mechanism performed in previous research. The fluttering characteristics of the upper unloaded pad are studied experimentally in order to verify the reliability of the bearing model. It was found that very little pad fluttering nearly occurs in the bearing model under various experimental conditions. In addition, no type of bearing failures by pad fluttering was detected in applications involving actual steam turbines.     

三系列工业汽轮机转子加工的探讨

叙述了三系列汽轮机转子的构造及重要性。介绍了其在机械加工过程,主要包括对转子进行叶根槽、轴颈的加工以及划线找十字中心线、划平衡孔线和锁口线。重点介绍了转子叶根槽、轴颈的加工以及在加工中如何保证转子的精度要求。     

可倾瓦轴承故障模式及其故障树的定性分析

与其他轴承相比较,可倾瓦轴承具有每块瓦均可自由摆动的主要优点;因此,在现代石化企业中,可倾瓦轴承在汽轮机和压缩机等高速旋转机械中得到了广泛的应用。本文详细介绍了影响可倾瓦性能的主要因素,重点对可倾瓦轴承的故障机理进行了分析,总结了可倾瓦轴承的失效模式,并从可倾瓦轴承的故障机理及失效模式入手,根据轴承发生故障的信息,逐层分析,并绘制其故障树模型。该方法主要目的是根据故障树模型,采取有效的防范措施,以防止同类事故再次发生。