PSI - Issue 59

M.G. Shulzhenko et al. / Procedia Structural Integrity 59 (2024) 337–343 M.G. Shulzhenko et al. / Structural Integrity Procedia 00 (2023) 000 – 000

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ones, while others may have stresses similar to those in the damaged blade. It is noteworthy that a significant number of blades on both sides of the damaged blade exhibit lower vibrational stress values within the range of vibration excitation frequencies from the steam flow.

a

b

Fig. 2. Frequency response at the maximum stresses in the lower third of the blades in the interval 2000 … 2200 Hz, which are located to the left ( a ) and right ( b ) of the damaged blade: damaged blade – 0.

From the analysis of the diagram of the blades maximum equivalent stresses at a vibration frequency of 2100 Hz several observations can be made. Firstly, there is an increase in maximum stresses in specific groups of blades located to the right (following the rotation of the rotor shaft) of the damaged blade, namely blades No. 0 – 2 and 31 – 46 (as shown in Fig. 3). Similarly, blades No. 0 – 19, 29 – 35, and 40 – 46 to the left of the damaged blade also exhibit increased stresses. Among these blades, particularly high stresses are observed in the first blade (1.79 kPa) and the thirty-ninth blade (2.409 kPa) to the right of the damaged blade. To the left of the damaged blade, the third blade