A Test RIG for Evaluation and Assessment of Vibration Isolators by Measuring Torque Transmissibility

In many vibration problems, the primary excitation force typically has a repetitive periodic nature, and in some cases this periodic forcing function may be even purely sinusoidal. Examples are excitations due to mass eccentricity and misalignments in rotational components. In basic terms, the frequency response of a dynamic system is the response to a pure sinusoidal excitation. As the amplitude and the frequency of the excitation are changed, the response also changes. In this manner, the response of the system over a range of excitation frequencies can be determined. This represents the frequency response. In this case, frequency is the independent variable and hence we are dealing with the frequency domain. Mechanical vibrations are intrinsically characteristic of rotating machines. Apart from that, other turbomachine characteristics, such as rotor unbalance, nonlinearity and shaft variable stiffness can introduce severe disturbances in the operation of the machine. Using spring and rubber isolator, various frequencies, various eccentric masses, various eccentricity measuring the torque transmissibility and graphs are analysed.