某船MAN B＆W柴油机主润滑油温度波动故障分析

某船右主机主润滑油进口温度出现较大范围波动由来已久,由于其温度波动在许可范围内．未引起足够重视．后经故障机理分析．解决了存在达12年之久的问题。     

轮轨润滑技术的发展

综述轮轨润滑技术的发展和现状,介绍国内外目前较先进的几种轮轨润滑装置及与之相匹配的润滑剂,指出轮轨润滑技术的发展趋势。     

纳米材料在汽车发动机机油中的应用

论述了纳米材料添加在汽车发动机机油中的摩擦学性能和机理,为发展我国高性能的汽车发动机机油提供有效途径。     

滑油运动粘度对尾轴轴颈振动的影响研究

船舶尾轴的振动与尾轴承油膜的动态支承刚度和阻尼密切相关,互相耦合,相互激励,影响船舶航行安全性.润滑油运动粘度是影响润滑油膜的动态特性的重要因素之一,粘度的改变对尾轴的振动行为产生重要影响.文中从动力学方面研究了滑油粘度对尾轴轴颈振动的影响,得出提高润滑油粘度有利于抑制轴颈振动的结论.     

涂油技术对曲线钢轨磨耗与振动的影响分析

小半径曲线轨道往往会加剧钢轨的磨耗与振动,影响列车的安全性和舒适度,增加维修养护的工作.文章以台湾铁路沙仑支线中洲车站端的爬升曲线为监测地点,在曲线前后端安装钢轨涂油器,进行为期6个月轨旁钢轨振动和磨耗的观测测量;分析小半径曲线轨道在润滑前后,列车经过时钢轨的磨耗和振动变化,观察涂油技术对钢轨磨耗和振动的影响.     

Frictional drag reduction with air lubricant over a super-water-repellent surface

This paper presents a new technique for reducing frictional drag using a super-water-repellent surface and air-injection (called an SWR & A technique). Its effectiveness was examined by carrying out pressure-loss measurements with a tube of rectangular cross section, along with resistance tests on a horizontal flat plate, a 7.2-m-long tanker model, and a 12-m-long high length-to-beam-ratio model ship. These test results showed that the new technique can significantly reduce the models' frictional drag; for example, the frictional resistance on the SWR surface was reduced by 80% at a speed of 4 m/s and 55% at 8 m/s. Received: October 16, 2000 / Accepted: December 4, 2000     

车用润滑油劣变状态在线监测系统开发

为了避免传统润滑油监测方法操作复杂、成本高、监测周期长且不能达到实时性要求的缺点,采用介电常数现代物理理论和试验分析方法,探讨了润滑油的酸值、铁含量和水含量这三个关键性评价指标与润滑油介电常数的变化关系,验证了润滑油介电常数作为润滑油质量综合评价指标的可行性.另外,通过新油和在用油监测数据的对比分析,开发了可直接测量润滑油品质参数的玻璃管型电容传感器和基于谐波振荡的车载润滑油监测系统,实现了车用润滑油品质的实时监测,确保按质换油.     

320 t鱼雷型混铁车技术改进与运用

针对320 t鱼雷型混铁车在使用中暴露出的车钩变形,缓冲器损坏,心盘螺栓剪断,心盘、轮缘润滑不良与环境污染等问题进行了研究与改进。提出采用13号大摆角车钩、ST型缓冲器,心盘、轮缘润滑采用干式润滑剂等方案,运用效果良好。     

冷却强度、配对副以及润滑介质对活塞环槽温度限值的影响

在自制的基于摩擦力的活塞环槽温度限值测试装置上,采用火焰加热活塞模拟内燃机燃烧室的燃烧过程,在加热强度一定的条件下,分别研究不同冷却强度、配对副以及润滑介质时缸套-活塞环间的摩擦力随活塞环槽温度的变化。结果发现:活塞环槽温度限值随冷却强度的增大而逐渐提高;CKS环与镀铬缸套配副时比镀铬环以及喷钼环与镀铬缸套配副时活塞环槽温度限值高;SAE15W/40润滑油作为润滑介质时比SAE40,SAE10W/30润滑油作为润滑介质时活塞环槽温度限值高。     

A New Experimental Rig of Testing Flow Boiling Heat Transfer of Refrigerant and Lubricant Mixture

This paper proposed a new experimental rig of testing flow boiling heat transfer of refrigerant and lubricant oil mixture. The quantity of oil in the test section can be controlled and regulated conveniently and accurately by connecting separate lubricant oil circuit with test section in parallel. It was built up by retrofitting a multiple air-conditioner and installing three oil-separators in serials at the compressor outlet. And so the lubricant oil in the discharged refrigerant gas of compressor can be removed completely. The refrigerant flow rate through test section can be bypassed by the by-path circuit of indoor unit. This experimental rig has advantages such as on-line and continuous oil injection, short time of obtaining stability, flexible operation, simple control, which lead to high efficiency in the research of flow boiling heat transfer of refrigerant and lubricant oil mixture.