Study On The Thin-film Lubrication Of Unsteady State Based On The Optical Interference Technique

With the development of science and technology, there are more and more demands on the analysis of lubrication in unsteady state, one of the most important factors in demonstrating the lubricating condition is the unsteady-state characteristics of the thin film lubrication. As a result, Researches about the properties of unsteady state thin-film lubrication have great significance in ensuring adequate lubrication, reducing wear and improving reliability of friction pairs.Based on the methods of relative intensity of light and the principle of optical interferometry, this paper shows the studies on the thin-film lubrication in unsteady state (including variable speed and variable load).Moreover, the measured thickness value and Hamrock-of Dowson theory calculated thickness value are compared in this paper.In order to measure the friction properties between the friction pairs, the loading device is redesigned.Under conditions of low speed and light load, the influences of the variable speed and load on the thickness of lubricating oil film and the friction between components is studied. Experimental results show that,(1)In the experiment of the variable speed and the given load, the film thickness did not increase immediately as the speed increased because of the infection in an accelerated cycle, and there is a hysteresis phenomenon;(2)The differences between measured thickness value and Hamrock-Dowson theoretical thickness value is obvious in the experiment with variable load at a given speed;(3)With the increase of speed, the friction tends to decrease, and finally stabilizes; the friction increases with the load increasing, the influence of load on the friction is much obvious.