PSI - Issue 36

Mykhailo Hud et al. / Procedia Structural Integrity 36 (2022) 87–91 Mykhailo Hud, Natalia Chornomaz, Roman Grytseliak et al. / Structural Integrity Procedia 00 (2021) 000 – 000

89

3

Table 1. Natural frequencies and oscillation periods of the grain leg tower

Form of oscillations

Version 1

Version 2

Frequency (Hz)

Period (s)

Frequency (Hz)

Period (s)

1 2 3 4 5 6

5.45 5.45 5.97

0.18 0.18 0.16 0.07 0.06 0.04

0.049 0.049 0.16 0.16 0.69 0.83

20.35 20.35 5.93 5.93 1.44 1.19

12.57 16.29 20.28

Fig. 2 and 3 shows the shape of the oscillations according to the first mode, for the first and second method of calculations at a frequency of 5.45 Hz and 0.049 Hz, respectively. According to the first mode a typical deformations are horizontal displacements concerning a vertical axis of a tower. Similar deformation patterns are inherent in the grain leg tower (Fig. 3) with the second method of calculation.

,

b)

a)

c)

d)

Fig. 2 Oscillations of the grain leg tower in the first mode in the first method of calculation a) general nature of deformations;b) movement on the axis ОХ ;c) movement on the axis ОУ ;d) movement on the axis OZ .