Study of Modal Behaviour of Viscoelastic Rotors Using Finite Element Method A THESIS SUBMITTED IN THE PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF Master of Technology In MECHANICAL ENGINEERING [Specialization: Machine Design and Analysis] By Pavan R.Mutalikdesai (211ME1345) DEPARTMENT OF MECHANICAL ENGINEERING NATIONAL INSTITUTE OF TECHNOLOGY ROURKELA YEAR 2012-2013