Mathematical modelling and dynamic analysis of composite hollow shaft

A numerous sector like aerospace, marine and automobile industries are extensively adopted the composite shaft due to its magnificent engineering properties. It possessing an excellent strength to weight ratio, higher the fundamental natural frequency and damping property over to conventional shaft. Present study deals with dynamic behaviour of composite shaft through improved simplified homogenized beam theory. Various influencing parameters like rotary inertia. Internal damping, and stacking sequence of composite material on composite shaft’s dynamic property has been studied. The finite element formulation has been accomplished to get the solution of the governing equations. The fundamental frequency of hollow carbon-epoxy composite shaft has been computed and verified with the published literature results. The present model has been extended for the analysis of hollow shaft with disc mounted on it. The effect of disc position and stacking order on critical speed and natural frequency of shaft rotor system has also been studied. It has been noticed that, critical speed and natural frequency is extensively affected by location of the disk and the staking order. When the disk is at center position has least natural frequency and critical speed. Natural frequency increases with shifting the disk towards the bearing end. The first natural frequency with the staking sequences 0°, 45°, and 90° gives 58.1 Hz while 75° gives 17.13 Hz. Authors of this study believe that the present dynamic model will be useful to practicing engineers for dynamic analysis of composite shaft with confidence.