浅谈活塞式压缩机运转条件的改善

通过对管路振动及噪声这两个主要影响活塞式压缩机运转条件的因素进行分析，提出了相应的改善措施。     

机载电子设备BGA封装热设计

由于表贴器件制造公差的影响,器件与冷板间的接触热阻无法有效控制。器件上方直接安装散热冷板的方法不能满足大热耗BGA封装器件的散热要求。介绍一种“活塞”式导热组件,充分考虑了上述因素,有效控制了器件与冷板间热阻。经过理论计算和实验验证,能够满足较大热耗器件在密封机载电子设备内的散热要求。     

Meeting tribological challenges with surface engineered materials

Abstract

Tribological applications in the automotive, cutting tool and biomedical implant sectors continue to raise challenges for engineering materials. A brief review of these sectors indicates opportunities to improve surface durability through the application of innovative coating materials. Specific devices that might be improved in this way are engine piston rings, roller bearings, cams, cam followers, cutting tools and total joint replacements. This is the first time that the impact of thin hard coatings on tribological function has been assessed in three distinct engineering sectors.