. Development and evaluation of a motion compensating lift system for deep ocean construction. Underwater construction; Marine engineering; Civil engineering. 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:
. Development and evaluation of a motion compensating lift system for deep ocean construction. Underwater construction; Marine engineering; Civil engineering. 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. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Hallanger, Lawrence W; Brackett, R. L; Naval Construction Battalion Center (Port Hueneme, Calif. ). Civil Engineering Laboratory. Port Hueneme, Calif. : Naval Construction Batallion Center
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