Page 120 - Thomson, William Tyrrell-Theory of Vibration with Applications-Taylor _ Francis (2010)

Sec. 4.5 Shock Response Spectrum 107

Figures 4.5-5 and 4.5-6 show the SRS for the half-sine pulse and the
triangular pulse, which are often good approximations to the actual pulse shapes.
For the half-sine pulse, the equation for the primary shock spectrum {t <
is obtained from the maximum of Eq. (4.4-6):

Irm (^)
xk 1
sm (4.5-4)
^0 /max 1 - ttT- 1 + ^
2^1 ^
whereas for the residual shock spectrum {t > t^), the maximum values of Eq.
(4.4-6) are

xk TTt,
COS (4.5-5)
T
^ 27: T

(

Figure 4.5-6. Shock response spectrum for triangular pulse.