Evaluation of Experimental Modal Analysis

Experimental modal analysis has grown steadily in popularity since the advent of the digital FFT spectrum analyser in the early 1970’s. Today, impact testing (or bump testing) has become widespread as a fast and economical means of finding the modes of vibration of a machine or structure. 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 analyse 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 paper, the vibration behaviour of radial flow impeller and Turbine generator foundation are reviewed. Vibration characteristics of the impeller are studied using experimental technique. Also, Vibration behaviour of the turbine generator foundation was verifieds.