Dynamics of an MDOF Rotor Stator Contact System
The vibrations of rotating machinery are an important issue in many engineered systems, from aircraft engines to drilling platforms. In many cases there is a possibility of rotor stator contact, which leads to non-smooth nonlinearities; this leads to complex multi period responses in a single rotor system, and poses a challenging problem when more degrees of freedom are considered. In this work we examine how interaction of the underlying modes of a two disc rotor, can lead to complex multi-period responses with intermittent contact. These motions can be excited at driving speeds that are well removed from the linear critical speeds of the rotor. However, it is demonstrated that the driving frequencies can be predicted and explained by synchronisation between two modal responses and the driving frequency.
KeywordsRotordynamics Impact Nonlinearity Chaos Whirl
The research leading to these results has received funding from the EPSRC grant ‘Engineering Nonlinearity’ EP/G036772/1.