LRT JABODEBEK’S WHEEL NOISE MITIGATION THROUGH THE USE OF CONSTRAINED LAYER DAMPERS AND PERFORATED SCHEMES

• Main Author: Faza Rosyada, Moh
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/70955
• Institution: Institut Teknologi Bandung

Rolling noise is the main source of train noise. Reducing rolling noise is one of the keys to better train ride comfort. This research is a necessity to reduce the rolling noise that occurs on the LRT Jabodebek rolling stock. Mitigation of rolling noise was carried out by developing a wheel model with the technology of constrained layer dampers (CLD) and a perforation scheme on the wheel web. The use of dampers is indeed commonly used for noise mitigation solution, but the application of a perforation scheme is a solution that is rarely implemented because it is related to wheel fatigue resistance. In this study, two solutions for implementing noise mitigation will be explored and compared for their impact on overall noise reduction. The research method in developing wheel models to mitigate rolling noise is carried out based on 3D solid simulation using the finite element method, through analysis in the frequency domain. To ensure that the method used has valid results, a reconstruction simulation of previous research on the UIC 920 wheel was carried out. The results of this research show that the 3D solid method through analysis in the frequency domain can be used. On the other hand, fatigue failure analysis on the perforation scheme was also carried out so that the developed model still has sufficient fatigue resistance. The results show that the application of constrained layer damper provides a better noise reduction effect than the perforated scheme. The model that provides the best reduction of sound radiation power is a modle with constrained layer damper whose natural frequency value adjusted to the natural frequency of the wheels.