DYNA}riCS OF PACKAGE CrSHIONLXG 



387 



The remainder of llie procedure for finding G,,, is the same as before. 

 The vahie of d,,, found from (1.12.2) is suhstiluted for .vj in the second of 



Fig. 1.12.1 — Curves for finding maximum acceleration as a result of abrupt bottoming. 



See equation (1.12.3). 



(1.4.4) and the value of P,n , thus obtained, is used, in (1.2.16), with the 

 result: 



where Go is the acceleration that would be reached if a displacement do 

 were available: 



Go = 



/ihko 



(1.12.4) 



The ratio Gm/Go is plotted against ds/do in Fig. 1.12.1 for several values 

 of kb/ko . Since, in practice, kb might be thousands of times as great as ^o ; 

 it may be seen that the increase in maximum acceleration can be very large 

 even when dg is only slightly less than do . It is apparent that a snubbing 

 device is desirable in a tension spring suspension. This is especially true 

 when considering high-frequency elements of the packaged article. It will 

 be shown, in Part III, that low-frequency elements are not affected as much 

 as might be expected from consideration of maximum acceleration alone. 



