LRT CARBODY, MULTI-CELL, TAGUCHI’S METHOD, STATIC LOAD, FREE VIBRATION.

• Main Author: Rifdan Hananzah, Nauval
• Format: Final Project
• Language: Indonesia
• Subjects: Teknik (Rekayasa, enjinering dan kegiatan berkaitan)
• Online Access: https://digilib.itb.ac.id/gdl/view/56953
• Institution: Institut Teknologi Bandung

Jabodebek Light Rail Transit (LRT) is a new public transportation in Indonesia. To ensure the safety of passengers, LRT carbody must satisfy the requirement of static and dynamic loading. The regulations used as a references in this study are PM 175 Tahun 2015, JIS E7105, and EN 12663. Base model used in this research is the carbody of Jabodebek LRT. This research was conducted to optimize the side sill components of LRT carbody using Taguchi method and Analysis of Variance (ANOVA) to obtain optimum deformation and mass. In this optimization process, there are 3 control factors that will be varied, which are multi-cell geometry, column thickness, and web thickness. The optimization results showed the most optimum configuration was the multi-cell geometry of single cruciform, column thickness of 9 mm, and web thickness of 7 mm. Then, the optimum structure of the carbody is analyzed under static loading and free vibration. The results of static loading simulations showed that the stress and deformation that occurred had met the requirements of the regulation, which are stress below 75% yield strength (multiply by 1.05 safety factor) and deformation below 11.5 mm. Free vibration tests have shown the bending modes and torsion modes along with the frequency. These modes can provide information about the response of the LRT carbody structure when it resonates. In addition, local bending modes on the end wall structure still occur at low frequencies. However, this local mode has little effect on the dynamic response of the carbody, so it can be simply ignored.