A contribution to the study of composite shaft onboard rotors

Abstract

The current understanding of rotordynamics and together with the capacity of modeling and predicting the physical behavior of such rotor systems have historically grown in bursts. Recent times have seen a great interest on the employment of advanced composite shafts and rotor systems for a myriad of industrial machines and innovative equipments. Consequently, this PhD Dissertation presents the review of traditional methods and the implementation of innovative Finite Element formulations adapted to the modeling of rotating systems. Accessory models for dedicated system components and specific physical phenomena are also revised and included into the Finite Elements models. An onboard composite shaft Classical Beam Theory model is developed, followed by an Unified Formulation model with additional capabilities. Three independent experimental test-rigs are utilized in the methodologies validation, reaching good representation of the rotors mechanical behavior. An adapted waterfall diagram is also presented as an alternative form of interpreting a full Unified Formulation model solution.