A STUDY ON THE PROPERTIES OF THE AGED CONICAL RUBBER SPRING FOR THE RAILWAY ROLLING-STOCK

초록

The objective of this study is to obtain data, from which maintenance criteria may be derived. A comparative analysis of conical rubber spring properties was performed between an aged specimen and a new one, with a view to analyze the change in properties according to the aging of a conical rubber spring. The creep deformation of the aged rubber spring specimen was measured to be approximately 8mm, and the increases in static spring properties were observed to be more than 15%, 25% and 20% in a longitudinal direction, a lateral direction and a vertical direction, respectively. The increases in dynamic spring properties were observed to be more than 30%, 15% and 15% in a longitudinal direction, a lateral direction and a vertical direction, respectively. The damping coefficient was observed to decrease in a vertical direction, but to increase in longitudinal and lateral direction. In order to analyze a change of dynamic properties of vehicle in accordance with the age of a spring, the experimental results of an aged spring were applied to a railway vehicle model. The dynamic analysis results showed that the aged conical rubber spring simultaneously deteriorated the critical velocity of the vehicle and had a negative influence on ride comfort. It had a particularly strong influence on the lateral behavior.