THE EFFECT OF COUPLING STIFFNESS ON MAGNITUDE AND PHASE ORDER TRACKING GRAPHS OF SIMPLE SHAFT ROTOR SYSTEM MODEL

• Main Author: Dhamma Wijaya, Jack
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/69079
• Institution: Institut Teknologi Bandung

Machine damage due to misalignment is still often found in industry. This is for the reason that the understanding of the characteristics of vibration due to misalignment is still not well understood. Whereas the characteristics of the vibrations that occur due to the misalignment of the shaft are very dependent on the value of the stiffness of the coupling used. Therefore, it is necessary to conduct research to study the effect of the coupling stiffness value on the magnitude and phase of the vibration produced due to the misalignment of the two shafts. In this study, both of the shaft and coupling systems are modeled as a two-degree-of- freedom system. This model is then simulated numerically with the parameters obtained using modal analysis. During the simulation, the value of the coupling stiffness is varied. To avoid errors, the numerical results will be validated with an analytical solution for the special case, i.e. when the value of the coupling stiffness is zero. numerical simulations were continued for the model which was given an excitation force with a frequency of 1XRPM and an excitation force with a combination of 1X and 2XRPM frequencies. The simulation results are displayed in a spectral map as well as magnitude and phase order tracking graph for each excitation force. Based on the results obtained, the effect of variations in the value of the coupling stiffness on the magnitude and phase of the vibration that occurs can be shown. The simulation results shows that the magnitude value at the first and second peak frequencies will decrease as the value of the coupling stiffness increase. In addition, the phase angle at the first peak frequency is always less than -90° and decreases as the coupling stiffness value increases. On the other hand, the phase angle at the second peak frequency will tend to approach -270° as the coupling stiffness value increases.