FINITE ELEMENT MODELLING OF A TURBINE BLADE TO STUDY THE EFFECT OF MULTIPLE CRACKS USING MODAL PARAMETERS

FINITE ELEMENT MODELLING OF A TURBINE BLADE TO STUDY THE EFFECT OF MULTIPLE CRACKS USING MODAL PARAMETERS

The presence of crack in a structure tends to modify its modal parameters (natural frequencies and mode shapes). The fact can be used inversely to predict the crack parameters (crack depth and its location) from measurement of the changes in the modal parameters, once a functional relationship betwe...

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Bibliographic Details
Main Authors: RAVI PRAKASH BABU KOCHARLA, RAGHU KUMAR BANDLAM, MALLIKARJUNA RAO KUCHIBOTLA
Format: Article
Language:English
Published: Taylor's University 2016-12-01
Series:Journal of Engineering Science and Technology
Subjects:
once a functional relationship between them has been established. The machine components like turbine blade can be treated as a cantilever beam. Vibration analysis of cantilever beam can be extended successfully to develop online crack detection methodology in turbine blade. In the present work
finite element model of a cantilever beam for flexural vibrations has been considered by including two transverse open U-notches. The modal analysis has been carried out on cantilever beam with two U-notches and observed the influence of one U-notch on the other for natural frequencies and mode shapes. It is found that a certain frequency may correspond to different crack depths and locations. Later
by using a central difference approximation
Finite element
Natural frequency
Mode shapes
Cantilever
Multiple cracks
Online Access:http://jestec.taylors.edu.my/Vol%2011%20issue%2012%20December%202016/11_12_9.pdf

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