b. A stochastic approach making use of cross 

 bi-spectral analysis for determination of 

 the exciting forces (both first and second 

 order) and multiple input-output analyses 

 for determination of system properties. In 

 this approach, the mechanical model (linear 

 or non-linear) is geared toward capability 

 of handling stochastic input and output. 



It is speculated that the latter method is potentially very 

 rewarding and that the additional effort that is required in 

 order to apply it to problems of interest more than justify 

 its development. In addition, there are a number of parallel 

 studies that should be carried out. These are: 



(1) Delineation of inertia and restoration 

 dominated systems. 



(2) Evaluation of relative importance of forces 

 due to radiation potential for 



(a) inertia dominated system, 



(b) restoration force dominated system. 



(3) Evaluation of criteria for including dynamic 

 cable effects. 



(4) Evaluation of criteria for determination of 

 linear, weakly non-linear, moderately non- 

 linear, and strongly non-linear systems. 



All of the above would be useful studies resulting in enhance- 

 ments to the essential development effort. 



I believe that the seminar probably achieved its purpose but 

 in a round about way that was somewhat inefficient and redun- 

 dant. In retrospect, I believe the format may have been too 

 structured and the agenda not geared toward achieving the goals, 

 For example, a clear statement of how the Navy breaks the 

 problem down (into the various tasks), how the tasks are re- 

 lated and their priorities, what results are expected, how 

 accurate the results should be, etc., etc., should have 

 preceeded the presentation of papers. 



All-in-all, the discussions could have benefited from more 

 decisive stimulation with summaries of each topic by the 

 moderator (or someone designated by the moderator) at the 

 conclusion of each discussion period. 



158 



