PSI - Issue 72

Victor Rizov / Procedia Structural Integrity 72 (2025) 120–127

126

Fig. 2. Influence o l 1 / l 2 ratio on the maximum SERR (curve 1 – for the frame supported by three links, curve 2 - for the frame supported by two links and a pinned support, curve 3 - for the frame supported by two links and a fixed support).

The values of the parameters used here are: l 1 = 4.00 m, l 2 = 2.00 m, a = 1.5 m, b = 0.20 m, n = 2000 revolutions/minute, m e = 7 kg and β = 0.5. The combined influences of l 1 / l 2 ratio and the supporting conditions on the maximum SERR are shown in Fig. 2. It can be seen in Fig. 2 that as the l 1 / l 2 ratio rises, the maximum SERR also rises because the frame rigidity is reducing. Concerning the influence of the supporting conditions (which is the main goal of the current study), one can see in Fig. 2 that the maximum SERR reduces as the supporting conditions change consecutively from these in Fig 1a (three links), via these depicted in Fig 1b (two links and a pinned support) to that in Fig. 1c (two links and a fixed support).

Fig. 3. Influence of a / l 2 ratio on the maximum SERR (curve 1 – for the frame supported by three links, curve 2 - for the frame supported by two links and a pinned support, curve 3 - for the frame supported by two links and a fixed support).

Figure 3 shows the influence which the a / l ratio has on the maximum SERR for the frame with the three types of supporting conditions defined in Fig. 1.