Archive image from page 11 of Development and evaluation of a. Development and evaluation of a motion compensating lift system for deep ocean construction . developmentevalu00hall Year: 1975 Figure 7. Response ratio for 40,000-pound load and 6,000-foot wire at 5 rate, showing effect of load damping (D). SYSTEM DESCRIPTION The MCLS is a passive system designed to decouple ship motion from the payload. This decoupling is accomplished by support of the load on a spring whose resonant frequency is significantly lower than the ship-motion frequencies that will be encountered. The system consists o
Archive image from page 11 of Development and evaluation of a. Development and evaluation of a motion compensating lift system for deep ocean construction . developmentevalu00hall Year: 1975 Figure 7. Response ratio for 40,000-pound load and 6,000-foot wire at 5 rate, showing effect of load damping (D). SYSTEM DESCRIPTION The MCLS is a passive system designed to decouple ship motion from the payload. This decoupling is accomplished by support of the load on a spring whose resonant frequency is significantly lower than the ship-motion frequencies that will be encountered. The system consists of five functional components: (1) the motion-compensation assembly, designed to decouple the payload from ship motion; (2) the traction unit to pay out and haul in the load line; (3) the diesel-hydraulic power source to provide all the power for system operation; (4) the operator- control section; and (5) the takeup or cable-storage reel to store the unused portion of the load-support cable. These five components of the complete MCLS are contained in two separate units. The motion- compensating/traction unit (left in Figure 13) includes the passive compensation assembly, the traction winch, the diesel-hydraulic power source, and the operator controls for the system. The cable- storage reel is separate and is shown on the right in Figure 13. Additional details of these two units are shown in F'igures 14 and 15. Motion-Compensating Equipment The boom of the motion-compensating equipment is pivoted at one end, has the payload lift line suspended from the other end, and is supported
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