STRUCTURAL AND VIBRATIONAL RESPONSE ANALYSIS OF H.P. BLADED DISC ASSEMBLY

In this article, an effort has been made to deal with structural behavior of the Steam turbine HP blade and disc assembly rotating at 100% (6000 rpm) optimum speed and 120% (7200rpm) over speed conditions which in turn create large amount of centrifugal force. This is the dominating force in steam turbine blade assembly which is the cause for all its behavior. Vibrational analysis of this HP blade and disc assembly is also carried out using FEA methods to determine and predict the fatigue life of the blade and disc. The Structural analysis is carried out on the HP blade and disc to understand the Structural behaviors which comes on them in order to find out the factor of safety of the HP blade and disc assembly due to high angular velocity. The Vibrational analysis is then carried out on HP steam turbine blade and disc assembly to find out the Frequencies acting on them for first 5 modes and to predict the safety of the blade and disc with the help of Campbell Diagram. Finally, the fatigue life analysis is carried out on the HP Blade and disc assembly with the help of S-N curve diagram for estimation of the fatigue life of the HP blade as well as the disc for satisfactory design of any steam turbine blade and disc assembly.