DYNAMICS ANALYSIS OF LONG COAL TRAIN 120 WAGONS DURING BRAKING

• Main Author: Nuansa Kharisma, Fariz
• Format: Final Project
• Language: Indonesia
• Subjects: Teknik (Rekayasa, enjinering dan kegiatan berkaitan)
• Online Access: https://digilib.itb.ac.id/gdl/view/68116
• Institution: Institut Teknologi Bandung

The Long Coal Train (Babaranjang Train) is the main transportation used for the coal distribution in South Sumatra. To increase the carrying capacity, PT KAI plans to add the number of wagons in a series to 120 wagons from around 60 wagons. Because of this addition, it is necessary to carry out further analysis regarding the dynamic performance of the long freight train during braking. The braking system used by Babaranjang Train is pneumatic brakes. The braking condition will work when the air pressure in the brake main pipe decreases. The pressure drop starts from the front locomotive. This causes nonuniformity in the application of braking in each wagon along the train. Consequently, there is a collision of rear vehicles into front vehicles so that the force acting on the connection between vehicles in the train or also called coupler force increases during braking and this increases the risk of derailment. In this final project, the modeling step and simulation process of the Babaranjang train were carried out using Universal Mechanism software. The model built is a train that consists of 4 locomotives and 120 wagons. The simulation results with an initial speed of 50 km/h and a curve radius of 500 m show that the position of the wagon that experiences the largest coupler force is the 66th wagon after braking is done. Simulations are also carried out by varying the input parameters which include wagon loads, braking modes, brake blocks, types of curves, and rail conditions. The simulation results show that the parameters of the loaded wagons, emergency braking, and composite brake block increase the maximum coupler force. Then, the parameters of empty wagons, emergency braking, composite brake block, and S-curve increase the maximum derailment coefficient. Simulation with rail irregularities shows that operating the train on a curve with a maximum cant is more dangerous than a curve without a cant.