DYNAMICS AND KINEMATICS OF SUBIVLIRINE CABLE 



1195 



TJA^ = 0.50 Ib/ft^ (twist unrestrained), 



Tg/A' = 0.93 lb/ft' (twist restrained). 



For an extreme value of A =20 feet, we get therefore that Tq is be- 

 tween 200 and 370 pounds. 



Additionally, by means of the above analysis, one can compute the 

 rate of damping of a transverse disturbance after it enters the water. 

 The results of this computation are shown in Fig. 18 and are discussed 

 in Section 4.1. 



2.0 



1.6 



1.2 



in 



0.4 



8 12 16 4 8 



PERIOD OF TRANSVERSE SHIP MOTION IN SECONDS 



12 



16 



Fig. 34 — Variation of the transverse ship motion tension of cable No. 2 

 with the period of ship motion. 



APPENDIX E 



Tension Rise with Time for Suspended Cable 



E.i Formidation of the Solution of the Problem, 



Let be the lowest point of the cable at time t after the suspension 

 has begun (Fig. 35). We make the following definitions: 



h = depth at onset of the suspension, 



Si = cable length from A to 0, 



S2 = cable length from ship at B to 0, 



Xi = horizontal distance from A to 0, 



