Dynamic behavior analysis of composite rotor

Abstract

Rotor dynamic is a branch of applied mechanics that plays a major role in keeping the vibrational energy as small as possible. It covers several topics, two of them are the base of this study: modelling and analysis. The use of composite materials in rotor dynamic analysis gives an important calculation to design efficient rotating composite shaft. The energy expressions of a composite rotor system are obtained by the use of rotating coordinate system. Lagrange’s equation obtains the equation of motions, and the finite element method solves those equations to obtain the matrices of the rotor system with the use of the MATLAB program that can handle complex and large matrices. Those mathematical models are used in order to explain the dynamic behavior of composite rotor. This model is used to investigate the unbalance response of a rotating composite shaft supported by flexible journal bearings in transient regime. The numerical results show that composite shaft made of Boron/Epoxy have better dynamic characteristics than Graphite/Epoxy.