MODAL AND HARMONIC ANALYSIS OF TURBOCHARGER TURBINE USING FINITE ELEMENT METHOD

Mechanical resonance is the tendency of a mechanical system to absorb more energy when the frequency of its oscillations matches
the system’s natural frequency of vibration than it does at other frequencies. It may cause violent swaying motions and even
catastrophic failure in improperly constructed structures. When designing objects, engineers must ensure the mechanical resonance
frequencies of the component parts do not match driving vibrational frequencies of oscillating parts, a phenomenon known as disaster.
Different techniques, experimental and theoretical have been developed to analyze problems related to vibration. But in the present era
computational techniques are quite common and are very reliable as far as the vibration analysis is concerned. In this work, the turbine
of turbocharger is analyzed for its vibration behavior using finite element method (FEM).The turbine was modeled in Pro E and
meshed in ANSYS. Modal analysis was conducted to calculate few initial natural frequencies. Results were studied in depth against
operating frequency of the turbine. After carrying out the modal analysis, harmonic analysis was done to see the response of the
turbine under dynamic loading. Nature and cause of the dynamic loading is also discussed in relation to dynamic behavior. It was
observed that turbine is safe in its entire range of operation as far as phenomenon of resonance is concerned. Also it was observed that
maximum harmonic response of the turbine on the application of dynamic loading is far lesser than its failure limit within specified
operating range.