Vol.26, No.1, 2026, pp. 23–27
https://doi.org/10.69644/ivk-2026-01-0023

RECONSTRUCTION OF A DAMAGED ROTOR SPOKE RIB - PART 1: STRESS ANALYSIS

Taško Maneski1 , Aleksandar Sedmak1* , Predrag Mitić2, Simon Sedmak3 ,

Dušan Trišić4, Dejan Ostojić5

1) University of Belgrade, Faculty of Mechanical Engineering, Belgrade, SERBIA

T. Maneski https://orcid.org/0000-0001-9717-3669 ; A. Sedmak https://orcid.org/0000-0002-5438-1895 ,

*email: asedmak@mas.bg.ac.rs

2) GOŠA Montaža, Belgrade, Serbia, SERBIA

3) Innovation Centre of the Faculty of Mechanical Engineering, Belgrade, SERBIA

S. Sedmak https://orcid.org/0000-0002-2674-541X 

4) Drinsko-Limske HE, EPS, Belgrade, SERBIA

3) Direkcija EPS, Belgrade, SERBIA

 

Abstract

Recently, during rehabilitation of RHPP in 2025, cracks were discovered in rotor spoke ribs. It was determined that cracking was caused by unexpected overloading due to weight. It was also concluded that cracks cannot be grooved and surface welded due to very limited space and some other limitations. Thus, a different approach had to be taken, leading to a reconstruction of the rotor spoke. To do so, it was necessary to stress release the rotor spoke ribs which was done by hydraulic lifting the whole rotor and then by strengthening the spoke ribs by new additional rib elements. This solution is based on detailed 2D and 3D stress analysis performed by the finite element method.

Keywords: • reconstruction • damage • rotor spoke • RHPP Bajina Bašta

full article (1.4 MB)