Finite Element Modelling of Dynamic Contact Application for Blade Root Damping Estimation
The problem of estimation of root-damping due to stick-slip in turbine blade vibration is addressed. Two-dimensional static and dynamic Finite Element approaches have been employed. An efficient static condensation technique is used for quasistatic analysis and the solution is obtained by performing a few iterations for the determination of unknown contact zone and forces. The method has been extended for the dynamic contact problem wherein an implicit time marching procedure using Wilson-θ method is employed. The efficient condensation and reduction technique considerably enhances the computational performance of the algorithm. Detailed parametric studies are reported for the damping behaviour of the blade root junction.
KeywordsAxial Force Contact Problem Lateral Load Dynamic Contact Contact Node
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