Scheepers, RonnieHeyns, P.S. (Philippus Stephanus)2016-11-102016-09Scheepers, R. & Heyns, P.S. A comparative study of finite element methodologies for the prediction of torsional response of bladed rotors. Journal of Mechanical Science and Technology (2016) 30: 4063-4074. doi:10.1007/s12206-016-0819-9.1738-494X (print)1976-3824 (online)10.1007/s12206-016-0819-9http://hdl.handle.net/2263/57871The prevention of torsional vibration-induced fatigue damage to turbo-generators requires determining natural frequencies by either field testing or mathematical modelling. Torsional excitation methods, measurement techniques and mathematical modelling are active fields of research. However, these aspects are mostly considered in isolation and often without experimental verification. The objective of this work is to compare one dimensional (1D), full three dimensional (3D) and 3D cyclic symmetric (3DCS) finite element (FE) methodologies for torsional vibration response. Results are compared to experimental results for a small-scale test rotor. It is concluded that 3D approaches are feasible given the current computing technology and require less simplification with potentially increased accuracy. Accuracy of 1D models is reduced due to simplifications but faster solution times are obtained. For high levels of accuracy model updating using field test results is recommended.en© KSME & Springer 2016. The original publication is available at : http://link.springer.comjournal/12206.Torsional vibrationEuler-BernoulliComponent mode synthesisCyclic symmetricTorsional excitationFinite element (FE)Engineering, built environment and information technology articles SDG-09SDG-09: Industry, innovation and infrastructureEngineering, built environment and information technology articles SDG-07SDG-07: Affordable and clean energyEngineering, built environment and information technology articles SDG-12SDG-12: Responsible consumption and productionPostprint Article