Shock test severity based on Shock Response Spectrum

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1 Shock test severity based on Shock Response Spectrum Frans Assink THALES NEDERLAND B.V. AND/OR ITS SUPPLIERS THIS INFORMATION CARRIER CONTAINS PROPRIETARY INFORMATION WHICH SHALL NOT BE USED, REPRODUCED OR DISCLOSED TO THIRD PARTIES WITHOUT PRIOR WRITTEN AUTHORIZATION BY THALES NEDERLAND B.V. AND/OR ITS SUPPLIERS, AS APPLICABLE.

2 Shock requirement in terms of acceleration vs. time 2

3 Shock requirement in terms of Shock Response Spectrum 3

4 The effect of a shock 4

5 The effect of a shock 5

6 Construction of the Shock Response Spectrum T Time history T = Maximum value during the pulse (initial) Maximum positive value after the pulse (residual) Maximum negative value after the pulse (residual) Absolute maximum value during and after the pulse (maximax)

7 Construction of the Shock Response Spectrum Magnification = Response Input T = ratio = T 7

8 Construction of the Shock Response Spectrum Time history T = 1 8

9 Construction of the Shock Response Spectrum Magnification = Response Input ratio = T

10 Construction of the Shock Response Spectrum Time history T = 2 10

11 Construction of the Shock Response Spectrum Magnification = Response Input ratio = T

12 Construction of the Shock Response Spectrum Time history T = 3 12

13 Construction of the Shock Response Spectrum Magnification = Response Input ratio = T

14 Construction of the Shock Response Spectrum Max response Shock amplitude Magnification = ratio = T

15 Shock Response Spectrum Magnification = Response Input 10 0 Double logarithmic scale ratio = T

16 Initial &Residual Shock Response Spectrum 16

17 Drop of height and acceleration level Half sine pulse drop of height [cm] 250 m/s 2 20 ms m/s 2 10 ms m/s 2 40 ms 8 SEVERITY? 17

18 Shock Response Spectrum Acceleration [m/s²] m/s² 40 ms 250 m/s² 20 ms 100 m/s² 10 ms Frequency [Hz]

19 Shock Response Spectrum Magnification = Response Input ratio = T

20 Effective transient duration 20

21 The effect of a shock 21

22 Shock test severity calculation 22

23 Shock test severity calculation 23

24 Shock isolation Equipment mounted to the ship structure 24

25 CLASSIFICATION Shock isolation 25

26 26

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