PSI - Issue 14

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N. Venkateswaran et al. / Procedia Structural Integrity 14 (2019) 627–633 N.Venkateswaran/ Structural Integrity Procedia 00 (2018) 000–000

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Table 1. Frequencies for different configurations

Iterations

Location, size & thickness of pad

1 st mode frequency in Hz

2 nd mode frequency in Hz

Case 1

Outside of the top plate (175x25mm), thickness 10 mm inside of the top plate, thickness 10 mm inside of the top plate, thickness 8 mm Inside of the top plate ( 30 x 26 mm) of 2 nos of pads, thickness 10 mm

131.18

275.99

Case 2

131.32

276.02

Case 3

130.53

273.93

125.02

271.62

Case 4

5.2 Shock Analysis Shock analysis was carried out on the assy. mounting bracket with the specification of 50 g (18 m s, half sine, and 50 g = 9810 * 50 = 490500 m/s 2 ) in each direction of three mutually perpendicular axis. The shock load in three directions (X - direction, Y - direction and Z - direction) are considered as separate load cases. Figure 3 (a) shows the shock load, applied on Z axis with gravity of 50 g (490500 m/s 2 ) on the amplitude curve (Amp-1.) which is for the shock load of 50g. Figure 3 (b) shows the shock spectrum curve for the amplitude 50g applied for 18 m s and it is a half sine wave curve for Time Vs Amplitude.

Fig. 3. (a) Shock load Applied on Z axis