PSI - Issue 60

Ashish Kumar et al. / Procedia Structural Integrity 60 (2024) 364–371

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A. Kumar, Y.V.N. Bhat, S.Patri, P.A.Kumar, S.I.S.Raj, A. Kumar, Y.V.N. Bhat, S.Patri, P.A.Kumar, S.I.S.Raj, S.S.Kumar, B.K.Sreedhar / StructuralIntegrity Procedia 00 (

/ StructuralIntegrity Procedia 00 (2019) 000–000

Fig. 9. Mode shapes obtained from FE analysis for first set of experiments

Fig. 10. Mode shapes obtained from FE analysis for modified experiments (sl. no. 5, Table 2 )

5.2. Analyses to understand modified experimental results

A FE model with a gap of 60 mm between IGT and OGT was created to simulate the modified experimental setup. However, a common frequency of 33 Hz was measured on both IGT and OGT even in the modified setup, making it evident that both remained connected at locations below the O connections between the two, a number of analyses were carried out by simulating single/multiple connections between IGT and OGT at various locations below the O arrive at an appropriate conclusion. The connections between the IGT and OGT are simulated using body hinge joints at various locations described in Table 2. Apart from this, OGT is fixed at the two weld locations, simply supported BC is provided at six lateral support locations of IGT. It is to be noted that due to pulling IGT out by 60 mm, its bottom-most lateral support ceases to act. The natural frequencies obtained under these BCs are given in Table 2. The BC and mode shapes corresponding to Sl. no. 5 of Table 2 are shown in locations below the O–ring. To explore the locations and number of between IGT and OGT at various locations below the O-ring location. The results are then logically interpreted to most lateral support ceases to act. The natural frequencies obtained under these BCs are given BC and mode shapes corresponding to Sl. no. 5 of Table 2 are shown in figure 10. ring. To explore the locations and number of are then logically interpreted to arrive at an appropriate conclusion. The connections between the IGT and OGT are simulated using body-to-body hinge joints at various locations described in Table 2. Apart from this, OGT is fixed at the two weld locations, and 10.

Table 2. Analytical natural frequencies under various IGT Sl. No Connection between IGT & OGT 1 i. Just below O-ring 2 i. Bottom-most part of OGT 3 i. Just below O-ring ii. Bottom-most part of OGT 4 i. Just below O-ring ii. Bottom-most part of OGT ring most part of OGT ring most part of OGT

Analytical natural frequencies under various IGT-OGT connections

First six Natural frequency (Hz) Natural frequency (Hz)

16.8; 28.7; 32.0; 34.6; 46.5; 50.2

2.2; 20.8; 28.7; 34.7; 48.9; 61.3

28.7; 30.5 ; 33.1; 34.7; 48.9; 61.7

iii. One more location between above two ring most part of OGT One more location between above two locations i. Just below O-ring ii. Bottom-most part of OGT iii. One more location between above two locations ring most part of OGT

28.7; 31.9 ; 34.7; 48.9; 61.7; 70.1

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28.7; 32.6 ; 34.7; 48.9; 61.7; 71.1