EXPERIMENTAL TESTING OF LATERAL STABILITY OF A BOGIE USING 1:5 SCALED ROLLER RIG

• Main Author: Idham, Kemal
• Format: Final Project
• Language: Indonesia
• Subjects: Teknik (Rekayasa, enjinering dan kegiatan berkaitan)
• Online Access: https://digilib.itb.ac.id/gdl/view/80476
• Institution: Institut Teknologi Bandung

Hunting motion is a lateral oscillation movement on a rail vehicle that needs to be analyzed when reviewing the lateral stability of the vehicle. Hunting movement needs to be prevented to avoid derailment, increased wear on wheels and rails, and so on. The speed at which this motion occurs is called the critical hunting speed. Currently, FTMD ITB has a tool that can simulate wheel-rail interaction on a bogie in the form of a roller rig with a scale of 1:5. However, this tool has not been used for experimental testing and does not yet have a data acquisition system. Given the importance of hunting movement and the urgency to develop the roller rig, the aim of this research is to analyze the lateral stability of the bogie by finding the critical hunting speed in cases of mass alteration and bogie center of mass shift, and in the process, to develop the roller rig to have an acquisition data system that can be used effectively. The process to achieve this goal begins with the design and assembly of a data acquisition system that includes displacement sensors in the form of LVDT, acceleration sensors in the form of IMU, rotational speed sensors in the form of a rotary encoder, signal processing elements in the form of Arduino, and the manufacture of brackets to support each component. Then, the critical hunting speed is obtained using the Stichel deceleration method. The obtained data is then processed in MATLAB to obtain critical speed values for cases of mass alteration and bogie center of mass shift in the lateral axis. The obtained critical speeds have values consistent with the theory, that is the nonlinear critical speed has a smaller value than its linear critical speed. The results show that as the bogie mass decreases, the critical speed of the bogie decreases as well. Results also show the shift in the bogie frame's center of mass in the lateral axis does not have a significant effect on the critical speed of the bogie. On the other hand, the designed data acquisition system has proven to be able to measure critical speed values in the roller rig.