Kim and Mevciev 



the swaying added mass Cgg due to the increase of the depth of the 

 false wall is nearly independent of the frequency. 



The heaving added masses Cjj-^ are remarkably dependent on 

 the depth of the Body b , T^/T a , and the frequency. 



The resultant heave-exciting forces F-^° +e ' on bodies a and 

 b were calculated and plotted in Figure 25c. For comparison, the 

 'leave- exciting forces on isolated a and b are also plotted in the same 

 figure. 



SLENDER VERTICAL FLOATS : ISOLATED PERFORMANCE AND 

 INTERACTION EFFECTS FOR LARGE ARRAYS 



BACKGROUND 



Column-stabilized floating ocean platforms used for oil ex- 

 ploration, research, or other applications, achieve low motions re- 

 sponse to wave action by proper shape and spacing of rigidly-connect- 

 ed flotation elements. Another type of platform, which can also afford 

 a useful working surface, might consist of an assemblage of resilient - 

 ly-connected flotation elements, each of which individually has suitable 

 motions response characteristics. Conceptual design studies for such 

 a platform have been undertaken by engineers of Goodyear Aerospace 

 Corporation (GAC). Davidson Laboratory of Stevens Institute of Techn- 

 ology has conducted a variety of hydrodynamic studies in connection 

 with the design developments, some of which will be described in the 

 present part of this paper. 



An illustration of a concept for the array of floats and deck 

 structure to be considered is depicted in Figure 26. The details of the 

 deck panels and truss system are not important for the present hydro- 

 dynamic study : the structural restraint on body motions is assumed to 

 be negligible (or, in a particular case, to be approximated by simple 

 mechanisms)'. The effect of hydrodynamic interactions on the relativ- 

 ely closely spaced floats may, however, be important. Much of the 

 presently described work, and work currently in progress, deals with 

 these interactions. 



An interesting feature of these multi-float platforms is that 

 they are expandable. Modular construction is intended to permit con- 

 venient deployment of arrays with any number of floats from about 50 



820 



