The paper reviews the present state of development of a new form of replenishment-at-sea system, for use in Sea State 6 conditions, being developed jointly by G.E.C. (processengineering) Ltd. and the Ministry of Defe...
The paper reviews the present state of development of a new form of replenishment-at-sea system, for use in Sea State 6 conditions, being developed jointly by G.E.C. (processengineering) Ltd. and the Ministry of Defense (Naval). The theoretical principles behind the new system are described in some detail and the essential control relationships are presented. A variety of analogue computer outputs contrasting the behavior of the new system as compared to constant tension systems, are discussed and illustrated. A fundamental objective in evolving the control philosophy for the new system has been to eliminate the oscillatory tendency present in a constant tension system. This tendency is discussed and the reasons for it determined. It is shown that a system in which control is based only on tension measurement is fundamentally unsatisfactory in the sense that it cannot meet in an adequate manner the various requirements of an R.A.S. System designed to work in rough sea conditions. The reasons for this state of affairs are described. A table comparing performance of existing Royal Navy systems with the new system is presented. The prototype hardware being built for sea trials in the late summer of 1970 is described and illustrated.
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