FINITE ELEMENT ANALYSIS AND DYNAMIC ANALYSIS OF THE OUTER BEARING BUSH FROM THE BLADE ADJUSTMENT MECHANISM OF KAPLAN TURBINES

Abstract

The objective of this paper is to analyze through the finite element method (FEM) and the motion analysis the dynamical behavior of the bushing adjustment mechanism of Kaplan turbines. The motion generated by the servomotor is transmitted from the fork head through the connecting rod to the pin lever – trunnion – blade subassembly. This subassembly of the Kaplan turbine is supported on the hub by two bushings: an outer bush and an inner bush. Analysis of the Kaplan turbine’s bushing was made in order to determine the stresses distribution, the displacements, the deformations and the factor of safety distribution. A three-dimensional model of the Kaplan turbine runner was generated based on the designed data. Finite element analysis and motion analysis was performed using SolidWorks package. Performing numerical calculations, the entire loading process history, the deformed geometry, the nodal velocity and the distribution of stresses, displacements and deformations are obtained. Results predicted by the finite element method show that this method is efficient and accurate and in good agreement with the theoretical and experimental values. Results from the current analysis can be used for further studies in design of the Kaplan turbine runners as part of a continuous product development process.