Bifurcation and dynamic response analysis of rotating blade excited by upstream vortices

doi:10.1007/s10483-016-2128-6

Abstract

Abstract:

A reduced model is proposed and analyzed for the simulation of vortexinduced vibrations (VIVs) for turbine blades. A rotating blade is modelled as a uniform cantilever beam, while a van der Pol oscillator is used to represent the time-varying characteristics of the vortex shedding, which interacts with the equations of motion for the blade to simulate the fluid-structure interaction. The action for the structural motion on the fluid is considered as a linear inertia coupling. The nonlinear characteristics for the dynamic responses are investigated with the multiple scale method, and the modulation equations are derived. The transition set consisting of the bifurcation set and the hysteresis set is constructed by the singularity theory and the effects of the system parameters, such as the van der Pol damping. The coupling parameter on the equilibrium solutions is analyzed. The frequency-response curves are obtained, and the stabilities are determined by the Routh-Hurwitz criterion. The phenomena including the saddle-node and Hopf bifurcations are found to occur under certain parameter values. A direct numerical method is used to analyze the dynamic characteristics for the original system and verify the validity of the multiple scale method. The results indicate that the new coupled model is useful in explaining the rich dynamic response characteristics such as possible bifurcation phenomena in the VIVs.

Key words: singularity theory, dynamic response, transition set, vortex-induced vibration, van der Pol oscillator, bifurcation phenomenon

2010 MSC Number:

70K30
70K50

Dan WANG, Yushu CHEN, M. WIERCIGROCH, Qingjie CAO. Bifurcation and dynamic response analysis of rotating blade excited by upstream vortices. Applied Mathematics and Mechanics (English Edition), 2016, 37(9): 1251-1274.

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