Vibration Transmissibility of a Three Degrees-of-Freedom System

• Main Author: Widodo, Widio
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/43183
• Institution: Institut Teknologi Bandung

Rotating machineries are commonly used equipment in industry. This type of machine often causes high vibration during its operation due to dynamic forces. The vibration can be transmitted to other machines located nearby and to the surrounding environment. Isolation vibration system is used to reduce the transmitted vibration. Vibration transmissibility that occurred can be studied through modeling and testing on a simple system. Thus, this research aims to study the vibration transmissibility of a three degrees-of-freedom system. The research begins by derivating the equation of vibration transmissibility and the spring stiffness criteria to satisfy a certain value of transmissibility. The research is then continued by choosing a case study in a form of a simple three degrees-of-freedom system then identify its dynamic parameters, namely mass, spring stiffness, and damping coefficients. These parameters are used to construct spring stiffness graphs and vibration transmissibility curves. Then, a vibration transmissibility testing is carried out using a shaker and an unbalanced rotating mass to validate the model. In this research, the equations of vibration transmissibility and spring stiffness criteria can be used to predict the spring stiffness needed so that the value of vibration transmissibility is less than certain value. In addition to the case study, system modeling produces vibration transmissibility graphs that is close to those obtained from the experiment.