VIBRATION TRANSMISSIBILITY AND FORCE TRANSMISSIBILITY RELATION WITH UNBALANCE MASS EXCITATION IN TWO DEGREE OF FREEDOM SYSTEM

• Main Author: Ayu Eriyanti, Vathiya
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/85526
• Institution: Institut Teknologi Bandung

ABSTRACT VIBRATION TRANSMISSmILITY AND FORCE TRANSMISSmILITY RELATION WITH UNBALANCE MASS EXCITATION IN TWO DEGREE OF FREEDOM SYSTEM by VATHIY A AYU ERIY ANTI NIM: 23115003 (Magister Mechanical Engineering) Machinery equipment often generates vibration during operation, especially for rotating machinery. The vibration is usually cause by the dynamic force transmission. Dynamic force can be transmitted from machine to structural fitting or to other machinery. Furthermore, the transmitted dynamic force is difficult to measure while the relative vibration transmissibility is easier to be directly measured. In this study, the connection between the vibration and force transmissibility on a system with two degrees of freedom is to be determined and predicted. The derivation process of the vibration transmission, force transmission, and relation between the two transmissions on a two degrees of freedom system is made to begin this research. Afterwards, experiments are made for both transmission on a two degrees of freedom system with impact as the excitation input. Results obtain from the experiments are compared to the past results made by Tobibi [1] for identifying the relation between vibration transmissibility to force transmissibility. Then, further experiments are made on the same system with rotational unbalance mass as the excitation input. In this study, the derived equation for relation between the vibration and FRF (Frequency Response Function) can be used to predict force transmissibility due to unbalance mass on a two degrees of freedom system. Furthermore, vibration transmissibility on a system with two degrees of freedom can be generalized as a system with one degree of freedom. Moreover, the maximum frequency of force transmissibility will occur on the same frequency as the system natural frequency.