An effort was made to remove some of these deficiencies by 

 sponsoring one analysis study which is often cited in the 

 literature and is well-known and somewhat of a milestone. This 

 study entitled, The Motions of a Moored Construction Type Barge 

 and Their Influence on Construction Operations , by Kaplan and 

 Putz, was completed in 1962 but interest in the problem seems 

 to have waned shortly thereafter. So, now it is refreshing to 

 note that the Navy has recognized the need for renewing interest 

 in this problem. 



It has been observed that the dynamics of moored ship systems 

 is a more general problem of the response of a vessel in a seaway 

 or what has been referred to in the literature as the ship motion 

 problem. This problem has occupied the attention of some of the 

 best researchers and high-level mathematicians for the better 

 part of this century. Therefore, nearly all of the analysis 

 techniques that have been developed in connection with ship 

 motion problems can be applied to the moored vessel problem. 

 However, we have three differences. First, we are usually 

 interested only in the zero forward speed case. Second, we have 

 the added complication of the mooring system, and, third, we are 

 usually interested in barges or other vessels which may not have 

 a traditional ship plan form. This last difference is more than 

 just a superficial interest since many of the simplifications 

 which are employed for ship motion studies are no longer appro- 

 priate for a moored vessel. 



MODEL CHARACTERISTICS 



One approach toward understanding mooring dynamic models is 

 to list all of the various models citing all the references, the 

 underlying assumptions, the various limitations, and the valida- 

 tion, if any. Unfortunately, such an approach is time consuming, 

 laborious and not particularly rewarding. 



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