MODAL ANALYSIS OF THE IMPERFECT BLADED DISK WITH FRICTION ELEMENTS

Abstract eng:
This paper is concerned with mathematical modeling of the imperfect bladed disk with friction elements, which are used to suppress blade vibration. These kinds of systems are mainly used in steam turbines where our interests are aimed. The friction elements are placed between shrouds of selected central symmetrical mounted blades (imperfection). A slipping is considered on the both contact surfaces. The model of the bladed disk is based on decomposition into a disk subsystem and a blading subsystem. The finite element method is used for modeling of the both subsystems. All influences of steady-state rotation are respected as centrifugal forces, gyroscopic effects, centrifugal stiffening of blades and dynamic softening. The model is used for a modal analysis of non-rotating and rotating imperfect bladed disk. Selected natural modes of non-rotating system will be shown. Dependency of eigenfrequencies on the angular velocity is presented in Campbell diagram. The methodology of simulation and postprocessing are implemented in an in-house software.

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