The movement of a piston rod in a pneumatic cylinder is directly affected by the air humidity in the atmosphere, especially in the case of piston rods without any means of protection or grease on their surfaces. In a pneumatic cylinder system, the friction between the piston rod and the rod seal is sliding friction, and it has a significant value that varies with the variation in the moisture on the piston rod’s surface. In this paper, an investigation of the friction characteristics of piston rods and rod seals in a pneumatic cylinder was carried out with different humidity and velocity values to understand the effect of lubricants on the moving parts of pneumatic systems in humid environments, where the friction characteristics of the displacements corresponding to the static and dynamic friction forces were displayed on a measuring device. The research results showed that the static friction forces tended to decrease by [Formula: see text] and that the dynamic friction forces tended to decrease by [Formula: see text] when the relative humidity increased from 51% to 99% at different velocities between 5 and 100 mm/s.

中文翻译：

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相对湿度和速度对气缸摩擦特性影响的研究

活塞杆在气缸中的运动直接受到大气中空气湿度的影响，尤其是在活塞杆没有任何保护手段或表面没有油脂的情况下。在气缸系统中，活塞杆与活塞杆密封件之间的摩擦为滑动摩擦，其值随活塞杆表面水分的变化而变化。本文通过对不同湿度和速度值的气缸中活塞杆和活塞杆密封件的摩擦特性进行研究，以了解润滑剂在潮湿环境中对气动系统运动部件的影响，其中摩擦特性与静摩擦力和动摩擦力相对应的位移在测量装置上显示出来。