DESIGN OPTIMIZATION OF MASK OF CAR MEDIUM SPEED TRAIN

• Main Author: SaputraDONY SAPUTRA, Dony
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/67222
• Institution: Institut Teknologi Bandung

Research and development of high-speed train in Indonesia has been begun, although it is still starting with the developing medium-speed trains. Many things must be considered from the drive system into aerodynamic aspect. Train design adjustments will also be needed in making higher train speed, considering that many aspects were previously not consider in the design on the lower-speed trains. When the train running at 250-300 km/h, 75-80% of the total resistance is drag. So, by reducing the drag, energy consumption will be reduced, and the train become more efficient. The aim of this study is to evaluate the design of medium speed train to the drag resistance. Then, the existing mask of car design will be optimized to minimize the coefficient of drag. It’s also to know the effect of the design variable to the drag resistance. In this study, mask of car design of the medium-speed train we will be optimized to reduce the drag resistance. However, to increase the level of local content of the train, the use of flat glass in the mask of car will be the constaint on this study. This study was conducted using Free Form and Computational Fluid Dynamics method. After that, the optimization was carried out using Response Surface Optimization to obtain the minimum coefficient of drag. The coefficient of drag result of original model is 0,489. The optimization can reduce drag resistance until 3.93% from the original model. Changing the front windshield design by removing the cutting mask surface can give significant effect to reduce the drag resistance until 1.49%. The design variable that gives significant impact to the drag are mask length and A-pillar dimension.