Abstract
The vibration dissipation mechanism of the rotating blade with a dovetail joint is studied in this paper. Dry friction damping plays an indispensable role in the direction of vibration reduction. The vibration level is reduced by consuming the total energy of the turbine blade with the dry friction device on the blade-root in the paper. The mechanism of the vibration reduction is revealed by the variation of the friction force and the energy dissipation ratio of dry friction. In this paper, the flexible blade with a dovetail interface feature is discretized by using the spatial beam element based on the finite element theory. Then the classical Coulomb-spring friction model is introduced to obtain the dry friction model on the contact interfaces of the tenon-mortise structure. What is more, the effects of the system parameters (such as the rotating speed, the friction coefficient, the installation angle of the tenon) and the excitation level on blade damping characteristics are discussed, respectively. The results show that the variation of the system parameters leads to a significant change of damping characteristics of the blade. The variation of the tangential stiffness and the position of the external excitation will affect the nonlinear characteristics and vibration damping characteristics.
Highlights
As a rotating and thin-walled structure, the blade will be subjected to high cycle fatigue damage because of the complex external excitation, which will reduce the reliability of the engine and even lead to catastrophic accidents
It can be known that the energy dissipation ratio of dry friction decreases gradually with the increase of the rotating speed, which results in the response amplitude of the blade increases
This paper established a dynamic model of the flexible rotating blade, and the blade is discretized by using the spatial beam element
Summary
As a rotating and thin-walled structure, the blade will be subjected to high cycle fatigue damage because of the complex external excitation, which will reduce the reliability of the engine and even lead to catastrophic accidents. The influence of the rotating speed, the friction coefficient, the installation angle of the tenon, the tangential stiffness, the excitation amplitude and the excitation position on the damping reduction characteristics of the system are discussed as follows.
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