MECHANICS OF RAISING AND LOWERING HEANA' LOADS IN THE DEEP 

 OCEAN: CABLE AND PAYLOAD DYNAMICS 



Technical Report R-433 



Y-F015-01 -01 -001(b) 



by 



P. Holmes, Ph D 



ABSTRACT 



Based on a theoretical analysis of the cable and payload dynamics during 

 lowering or raising heavy loads in the deep ocean given in Project Trident Technical 

 Report No. 1370863, further calculations of the maximum dynamic stresses expected 

 in the lowering cable are presented covering a wide range of cable and payload 

 parameters. The theoretical analysis is adapted to a proposed design procedure, and 

 two typical design examples are given, the results of which are discussed in terms of 

 the safety of the lowering or raising operations. 



In order to make the design procedure applicable with a greater degree of 

 confidence, it is considered necessary to make measurements of cable tensions and 

 load and ship motions during a full-scale operation to fill in deficiencies of data 

 and provide a basis for verification of theory and calculations. In particular, data 

 are needed on the coefficients of drag and mass, which at this stage must of necessity 

 be estimates. 



Distribution of this document is unlimited. 



The Laboratory invites comment on this report, particularly on the 

 results obtained by those who have applied the information. 



