ANALYSIS OF THE EFFECT OF IRREGULARITY AND STIFFNESS VARIATION OF RAILROAD ON TRAIN DYNAMIC RESPONSEUSING DYNAMIC SIMULATION.

• Main Author: Ichsan Netsyah, Rizki
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/73669
• Institution: Institut Teknologi Bandung

Monitoring railroad conditions by utilizing the dynamic response data of regular trains that are in operation will be more efficient in terms of cost and time compared to measurements using a special KUJR (Railway Measurement Train). Damage to railroads can be caused by geometric irregularities or variations in stiffness that exceed tolerance limits. Thus, to determine the appropriate maintenance action, it is necessary to identify damage to a location caused by the influence of geometric irregularities or the stiffness of the railroad. To find out that track damage is caused by track geometry or variations in stiffness that are out of tolerance, a preliminary study is needed to observe the influence of the dynamic response of the train produced by variations in the stiffness of the track, as well as to analyze how the dynamic response of the train is caused by a combination of track geometry irregularities and variations in the stiffness of the rail. The study was carried out by dynamic simulation using UM (Universal Mechanism) software with a review of the dynamic response in the vertical direction only. In order to comprehensively understand the dynamic interaction between trains and railroads, it is necessary to incorporate variations in the stiffness of the rail and the flexible rail model into the dynamic model apart from the geometric irregularities. The results of dynamic simulations carried out with various combinations of irregularities and variations in ballast stiffness show that the ballast stiffness values have an effect on the dynamic response of trains and carriages. The increase in the ballast stiffness value will go hand in hand with the increase in the contact force on the carriage wheels. The combination of geometric irregularities and variations in the ballast stiffness with a single slump curve at the same location causes two dynamic responses to the train which are mutually reinforcing.