PDF - The Journal of Physical Security - Argonne National Laboratory

Journal of Physical Security 4(2), 10-29 (2010)With the choice of the natural oscillation frequency of 56 sec -1 along with the design point (P d = 8 psi andI d = 170 psi msec = 0.17 psi sec), eq. [25] requires p d /i d = 0.84. From Figure 10, it can be seen that p d =1.01145 and i d = 1.2. For this example, then,Accordinglyχ = I d /i d ω = 0.0025 [23]P = 8 psi [24]I = 142 psi-msec [25]This design curve is shown in Figure 11.P(psi)I(psi-msec)Figure 11. Design curve passing through 8 psi and 170 psi msec for a natural oscillation angular frequency of 56sec -1 .As another example, suppose instead the design point is taken to be 16 psi and 185 psi msec, and thenatural oscillation angular frequency remains at 56 sec -1 . The same procedure leads in this case toP = 9.42 p psi [26]I = 168 i psi-msecThe resulting design curve for 16 psi and 185 psi msec is shown in Figure 12 (dashed) and compared tothe design curve of Figure 10 for 8 psi and 170 psi msec.24