忽略时间延迟磁浮轴承Jeffcott转子系统平衡点的稳定性

利用常微分方程中的中心流形理论来讨论,磁浮轴承Jeffcott转子系统的平衡点(0,0)的稳定性。     

Experiment and Simulations on Lubrication Performance of EMP Journal Bearing

In recent years, much attention has been devoted to the design and operation of bearings made of elastic metal plastic (EMP). The surface of the bearing bush is covered by a layer of polymer PTFE(polytetrafluoroethylene). The physical performances of the polymer are quite different from that of metal. It can reduce friction because of its lower surface energy, and it is more difficult for the fluid to be adhered. Consequently, the slip will exist at the oil-bush interface. The journal bearings made of this material are researched in this article. Through test, the existence of slip is proven and the equation of the slip velocity for the EMP journal bearing is established when shear stress up to a certain value. Thus, the classical Reynolds equation is modified. The lubrication mechanism is analyzed by some simulation results.     

Theoretical Investigation on a Novel Hydrodynamic Journal Bearing

To improve the static and dynamic performance of hydrodynamic journal beatings, a novel bearing is developed, which is a cone-shaped hydrodynamic bearing with spiral oil wedges. The major structural feature of this bearing is the three spiral circular recesses on the beating‘s surface, leading to improved characteristics. This paper aims to develop a model for design and calculation of the geometric parameters and the oil film thickness, and to provide a theoretical analysis to the static characteristics using a f‘mite element method. Some new features are introduced.     

针织圆纬机大盘齿轮磨损分析

针对国内针织企业使用圆纬机的过程中出现的大盘齿轮失效的问题,经生产实践总结,可知大盘齿轮的失效形式主要有磨损、表面疲劳、塑性变形、齿断裂、气蚀等.大盘齿轮失效的原因主要有材料选择不当、装配精度低、钢丝滚道轴承失效等方面.为解决这些问题带来的影响,设计特种回转支承结构的方案,经试验能够解决大盘齿轮失效的问题.     

一个科技人员的人生博弈——记化纤设备专用轴承专家李国栋

李国栋，1942年出生于江苏南通，1962年南京中专毕业分配到哈尔滨轴承厂军工车间工作。1966年三线建设。随厂军工车间内迁到贵州安顺虹山轴承厂。他从一线当工人开始，历任班长、工段长、技术员、车间主任、分厂厂长、轴承研究所副所长及营销部经理。     

浅析振动分析在故障检测中的应用

振动信号出现在几乎所有的机械设备当中,这些信号往往含有非常丰富的信息,善用这些信息,对机械设备的运动状态的检测有着莫大的帮助。本文以轴承为例,浅析振动分析在故障检测中的各种方法及相关的特征参数。     

空调风机轴承的噪音问题

空调噪音,一般在空调系统运行状况下出现,如风机逸入室内的噪音、风管末端带来的再生噪音等。风机噪音,具有无规则性,在叶片旋转和空气装机状态下更容易产生。如果不对空调风机采取隔声装置,或者是进行噪音处理,那么出风口将有大量噪音出现。文章通过分析空调风机轴承的噪声形成机理,探讨了几种常见的降噪方法。     

发电厂汽轮机轴承安装工艺及检修方法探究

轴承是汽轮机发挥作用的关键所在,其主要的功能是承担转子重力,以此保证转子能够顺利的转动,发电厂汽轮机轴承安装十分重要,如果安装方法出现了问题,不仅会损伤轴承,也会影响汽轮机,进而影响到发电厂,因此必须选择合适的安装方法,并且由专业的安装人员来进行安装,只有如此才能保证安装质量。本文主要通过对轴承分类及工作原理的介绍,进而探讨了其安装工艺以及检修,仅供交流。