DYNAMICS OF PACKAGE CUSHIONING 



421 



value given in Column (8), Table III, for the maximum height off drop. 

 Then, 



A(:*;2)„ = ^G„.gA/2 (2.12.3) 



or 



At 



/ 



2A{X2)n 

 Gmg 



(2.12.4) 



.01 



.02 .03 



t 



.04 



Fig. 2.12.3 — Acceleration-time curve (for the cushioning shown in Fig. 2.12.1) obtained 



by numerical integration. 



In the present instance, 



(AiC2)n = 0.01 inches 



Gmg = 30.8 X 386 = 11900 in/sec.^ 



Hence, from (2.12.4), At = 0.0013 sec. and the last entry in Column (17) 

 is obtained by adding this value of At to the preceding entry. 



The final curve of acceleration vs. time is obtained by plotting the entries 

 of Column (17) against the entries of Column (8), Table III, for correspond- 

 ing values of X2 . The result is shown in Fig. 2.12.3. 



